Download Previous Year PTU University Question Paper of Power System-1 BTEE-405 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper
B.Tech.(EE-2011 Batch)
POWER SYSTEM-1
Subject Code : BTEE-405 Paper ID : [ A1208]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper
SECTION-A
Q1. Write Short Notes on :
a) State disadvantages of HVDC transmission. b) Give the advantages of high voltage AC transmission. c) Mention limitations of Kelvin’s law. d) Enumerate merits of bundled conductor. e) Define safety factor of insulator and give its significance. f) What is skin effect ? Why is it absent in the dc system? g) Define the terms feeder and distributor. h) What is the importance of intersheath in cables? i) State advantages of placing series capacitors in transmission lines. j) What is meant by surge impedance loading?
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. Compare the volume of conductor material required in dc single phase and three-phase ac system. 3. In a 33 kV overhead line, there are three units in the string of insulators. If the capacitance between each insulator pin and earth is 11% of self-capacitance of each insulator, find : (a) the distribution of voltage over 3 insulators (b) string efficiency. 4. A single phase transmission line has two parallel conductors 3 m apart, the radius of each conductor being 1 cm. Calculate the loop inductance per km length of the line if the material of the conductor is : (a) copper (b) steel with relative permeability of 100. 5. Show how regulation and transmission efficiency are determined for medium lines using nominal T method. Illustrate your answer with suitable vector diagram. 6. Derive an expression for the insulation resistance of a single-core cable.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. (a) What is the percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss? (b) Show that in a string of suspension insulators, the disc nearest to the conductor has the highest voltage across it. (6,4) 8. (a) Describe the Receiving end circle diagram for long transmission lines based on ABCD constants. (b) Discuss the effect of earth on capacitance of conductors. (6,4) 9. Write short notes on any two of the followings : (a) Synchronous phase modifiers (b) Kelvin’s law (c) Compensation of transmission lines. (2×5)
A 33 kV overhead line, there are three units in the string of insulators. If the capacitance between each insulator pin and earth is 11% of self-capacitance of each insulator, find : (a) the distribution of voltage over 3 insulators (b) string efficiency.
Single phase transmission line has two parallel conductors 3 m apart, the radius of each conductor being 1 cm. Calculate the loop inductance per km length of the line if the material of the conductor is : (a) copper (b) steel with relative permeability of 100.
Expression for the insulation resistance of a single-core cable.
Power System-1 4th Sem Batch 2011 B.Tech PTU April 2013 Question Paper
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper
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Find percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss.
Short Note on (c) Compensation of transmission lines.
Power System-1 4th Sem Batch 2011 B.Tech PTU April 2013 Question Paper
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Download Previous Year PTU University Question Paper of Power System-1 BTEE-405 4th Sem Batch 2011 Onwards B.Tech PTU April 2019 Question Paper
B.Tech.(EE-2011 Batch)
POWER SYSTEM-1
Subject Code : BTEE-405 Paper ID : [ A1208]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2019 Question Paper
SECTION-A
Q1. Write Short Notes on :
a. Define slip of an induction motor.
b. Explain slip frequency of a 3-phase induction motor.
c. Why an induction motor operates at a very low power factor under no-load?
d. Why an induction motor cannot run at synchronous speed?
e. Write two application of single-phase induction motor.
f. Why starting current is high for an induction motor?
g. Why airgap between stator and rotor of induction motor is very small?
h. If a single-phase induction motor is started with auxiliary winding open, what will happen?
i. How direction of rotation of a three-phase induction motor can be reversed?
j. Write the difference between a squirrel cage and slip ring induction motor.
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. Discuss losses in a 3-phase induction motor.
3. Sketch and explain toque-slip characteristics of 3-phase induction motor.
4. Explain the starting of squirrel cage induction motor by using Direct-on-line method.
5. Explain how higher starting torque can be obtained in :
a. Squirrel cage induction motor
b. Wound rotor induction motor.
6. Explain how rotating torque is generated in a single-phase induction motor
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. Write the constructional features, working principle and applications of single-phase reluctance motor. 8. A 230V, 380W, 60 Hz, 4-pole, single phase induction motor gave the following test results : No-load test : 230V, 84W, 2.8A Blocked-rotor test : 110V, 460W, 6.2A The stator winding resistance is 4.5 ohms and during the blocked rotor test, the auxiliary winding is open. Determine the equivalent circuit parameters and draw the equivalent circuit. 9. Describe the methods of speed control of three phase induction motor.
How rotating torque is generated in a single-phase induction motor
Power System-1 4th Sem Batch 2011 B.Tech PTU April 2019 Question Paper
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2019 Question Paper
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A 230V, 380W, 60 Hz, 4-pole, single phase induction motor gave the following test results : No-load test : 230V, 84W, 2.8A Blocked-rotor test : 110V, 460W, 6.2A The stator winding resistance is 4.5 ohms and during the blocked rotor test, the auxiliary winding is open. Determine the equivalent circuit parameters and draw the equivalent circuit.
Methods of speed control of three phase induction motor.
Power System-1 4th Sem Batch 2011 B.Tech PTU April 2019 Question Paper
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Download Previous Year PTU University Question Paper of Power System-1 BTEE-405 4th Sem Batch 2011 Onwards B.Tech PTU Nov 2016 Question Paper
B.Tech.(EE-2011 Batch)
POWER SYSTEM-1
Subject Code : BTEE-405 Paper ID : [ A1208]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU Nov 2016 Question Paper
SECTION-A
Q1. Write Short Notes on :
a) Why is electrical power preferably to be transmitted at a high voltage?
b) What is the purpose of insulator?
c) What are the materials mainly used in bus bar?
d) What is the main purpose of armouring?
e) State Kelvin’s law.
f) Why all overhead lines use ACSR conductors?
g) What is meant by inductive interference?
h) Why transpositions of conductors are done in overhead lines?
i) Define regulation of power transmission line.
j) What are the different tests that are conducted on an insulator?
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. What are the AC transmission and distribution level voltages we have in India?
3. Why the concept of self G.M.D is not applicable for capacitance?
4. What are the various properties of insulators? Also briefly explain about suspension type insulators.
5. Explain any two methods of grading of cables.
6. Discuss reactive power requirement of system and series compensation.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. Derive the expression for capacitance of a 1 transmission line.
8. A three phase 5 km long transmission line having resistance of 0.5 , / km and inductance of 1.76 mH/km is delivering power at 0.8 pf lagging. The receiving end voltage is 32 kV. If the supply end voltage is 33 kV, 50 Hz, find line current, regulation and efficiency of the transmission line.
9. A transmission line conductor at a river crossing is supported from two towers at heights of 30 m and 90 m above water level. The horizontal distance between the towers is 270 m. If the tension in the conductor is 1800 kg and the conductor weighs 1.0 kg per meter. Find the clearance between the conductor and the water at a point midway between the towers? Assume parabolic configuration.
Reactive power requirement of system and series compensation.
Power System-1 4th Sem Batch 2011 B.Tech PTU Nov 2016 Question Paper Click Here
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU nov 2016 Question Paper
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Three phase 5 km long transmission line having resistance of 0.5 , / km and inductance of 1.76 mH/km is delivering power at 0.8 pf lagging. The receiving end voltage is 32 kV. If the supply end voltage is 33 kV, 50 Hz, find line current, regulation and efficiency of the transmission line.
Transmission line conductor at a river crossing is supported from two towers at heights of 30 m and 90 m above water level. The horizontal distance between the towers is 270 m. If the tension in the conductor is 1800 kg and the conductor weighs 1.0 kg per meter. Find the clearance between the conductor and the water at a point midway between the towers? Assume parabolic configuration.
Power System-1 4th Sem Batch 2011 B.Tech PTU Nov 2016 Question Paper
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Download Previous Year PTU University Question Paper of EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
B.Tech.(EE-2011 Batch)
EMEC & DC Machines
Subject Code : EE-202 Paper ID : [ A0407]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
SECTION-A
Q1. Write Short Notes on :
a) Why there is need of starters for DC motors? b) List the main parts of DC machine. What is importance of a commutator? c) How can we obtain the internal characteristics from external characteristics of a DC shunt generator? d) State and briefly discuss the principle of electromechanical energy conversion with one simple example. e) Define winding factors and benefits of short pitched coils. f) What is the function of compensation winding in a DC machine? g) If DC motor fails to start when switched on. What could be the possible reasons and remedies? h) When load is removed, _______ motor will run at the highest speed. i) Show the energy in magnetic field is expressed as E=l/2mH2=b2/2m j) Draw schematic diagram of a metadyne generator which behaves as a constant current generator.
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. What is commutations? What causes sparking on the commutator surface and how can it be avoided? Explain. 3. Discuss flow of energy in electromechanical devices via coupling fields to confirm the generating and motoring principles. 4. Classify DC generators. Show VI characteristics of all type of DC generators. 5. Explain why the speed torque characteristic of DC shunt motor is not linear in the high torque region. 6.A 60 KW, 250 V shunt motor takes 16A when running at 1440 The resistance of the armature and field are 0.2 Ohm and 125 Ohm respectively.When hot
a) Estimate the efficiency of the motor when taking 152A. b) Also estimate the efficiency if working as a generator and delivering a load current of 152A at 250 V.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. (a) What is the percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss? (b) Show that in a string of suspension insulators, the disc nearest to the conductor has the highest voltage across it. (6,4) 8. (a) Describe the Receiving end circle diagram for long transmission lines based on ABCD constants. (b) Discuss the effect of earth on capacitance of conductors. (6,4) 9. Write short notes on any two of the followings : (a) Synchronous phase modifiers (b) Kelvin’s law (c) Compensation of transmission lines. (2×5)
Estimate the efficiency if working as a generator and delivering a load current of 152A at 250 V.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
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Find percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss.
Short Note on (c) Compensation of transmission lines.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
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Download Previous Year PTU University Question Paper of EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU Nov 2016 Paper
B.Tech.(EE-2011 Batch)
EMEC & DC Machines
Subject Code : EE-202 Paper ID : [ A0407]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU Nov 2016 Paper
SECTION-A
Q1. Write Short Notes on :
(a) What is the significance of coenergy in the torque derivation of an electrochemical energy conversion device?
(b) Define Electric field energy.
(c) What is meant by SPP?
(d) Define Distribution factor & Breadth factor.
(e) Compare lap and wave winding.
(f) Why carbon brushes are used in D.C. machines?
(g) What is the purpose of interpole & compensating winding?
(h) Why differential compound motor is not used practically?
(i) Why series motor can’t be used in belt pulley arrangement?
(j) Define critical field circuit resistance for shunt generator.
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. Explain the principle & working of hysteresis motor.
3. Explain why distributed field winding is employed in a cylindrical rotor machine.
4. Derive emf equation for D.C. generator.
5. Explain a method used for getting a speed more than the rated speed in D.C. shunt motor.
6. Explain the principle & working of cross field generator.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. Draw & explain the load characteristics of D.C. shunt generator & hence show that it is self protecting in nature.
8. Why starters are used in D.C. machines? Explain the construction & working of three point starter.
9. The Hopkinson’s test on two machines gave the following results for full load : Line voltage 250V; line current excluding field current 50A; motor armature current 380A; field current 5A and 4.2A. Calculate the efficiency of each machine. Armature resistance of each machine is 0.02 Ohm. State the assumptions made.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU Nov 2016 Paper
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU nov 2016 Paper
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Hopkinson’s test on two machines gave the following results for full load : Line voltage 250V; line current excluding field current 50A; motor armature current 380A; field current 5A and 4.2A.
Find the efficiency of each machine. Armature resistance of each machine is 0.02 Ohm. State the assumptions made.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU Nov 2016 Paper
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Download Previous Year PTU University Question Paper of Electric Generation & Economics BTEE-502 5th Sem B.Tech EE PTU Nov 2016 Paper
Roll No. ______________ Total No. of Questions : 09 Total No. of Pages : 02 B.Tech.(EE) (2011 Onwards) / (EE) PTU B.Tech. (Electrical & Electronics) (2011 & 2012 Batch) (Sem.–5) ELECTRIC GENERATION AND ECONOMICS Subject Code : BTEE-502 Paper ID : [ A2108]Time : 3 Hrs. Max. Marks : 60
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Electric Generation & Economics BTEE-502 5th Sem B.Tech EE PTU Nov 2016 Paper
SECTION-A
Q1. Write Short Notes on :
1. What are the functions of Central Electricity authority?
2. What is diversity factor? How it is important?
3. What are the effects of low power factor?
4. What is necessity of long term load forecasting?
5. Which type of plant has highest capital cost and why?
6. Compare shunt capacitors and synchronous condensers.
7. What is difference between present worth and capitalised cost?
8. What is equal incremental cost criterion?
9. For which type of countries is hydro-thermal economical?
10. Between which quantities are mass curve and load curve plotted?
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. Write a descriptive note on organization of power sector in India. 3. A 400 V, 3-phase installation draws a current of 50A at 0.8 power factor lagging under full load conditions. It is desired to install a synchronous motor to raise the full load overall power factor to 0.95 lagging. The synchronous motor will drive a 25hp (metric) load at an efficiency of 0.9. Find the kVA and power factor of synchronous motor. 4. Discuss straight line and fixed percentage methods of depreciation. 5. What do you mean by economic comparison of alternators? 6. The load curve of an electrical system is shown below and is linear with the following values at different times of the day. The load is in MW. First row is showing time and second load is showing load.
12 mid night
5am
9am
6pm
8pm
10pm
12 mid night
50
50
100
100
150
80
50
Plot chronological load curve, load duration curve and mass curve for the above mentioned data. Find the energy required by system in one day and calculate the system daily load factor
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. Discuss the benefits of cogeneration. 8. a) Write short descriptive note on aquatic impacts. b) Discuss the iterative procedure to solve the co-ordination techniques.
9.The fuel inputs F1 and F2 in kCal/hour for units 1 and 2 are given by : F1 = (2P1 + 0.005P12 + 20)104
F2 = (1.5P2 + 0.01P22 + 30)104
where P1 and P2 are outputs in MW.
1.Plot the variation of input with output for the two units as the load varies from 20 MW to 100 MW in each case.
ii. Find heat rate in k Cal/MW-hour for each unit and plot it against
iii. If the fuel cost is 1 per 10,000 kCal, calculate incremental fuel cost in Rs. Per MW-hr for each unit and plot it against output.
400 V, 3-phase installation draws a current of 50A at 0.8 power factor lagging under full load conditions. It is desired to install a synchronous motor to raise the full load overall power factor to 0.95 lagging. The synchronous motor will drive a 25hp (metric) load at an efficiency of 0.9. Find the kVA and power factor of synchronous motor.
Load curve of an electrical system is shown below and is linear with the following values at different times of the day. The load is in MW. First row is showing time and second load is showing load.
Electric Generation & Economics 5th Sem B.Tech EE PTU Nov 2016 Paper
Electric Generation & Economics 5th Sem B.Tech EE PTU Nov 2016
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Fuel inputs F1 and F2 in kCal/hour for units 1 and 2 are given by : F1 = (2P1 + 0.005P12 + 20)10 F2 = (1.5P2 + 0.01P22 + 30)104 where P1 and P2 are outputs in MW.
If the fuel cost is 1 per 10,000 kCal, calculate incremental fuel cost in Rs. Per MW-hr for each unit and plot it against output.
Electric Generation & Economics 5th Sem B.Tech EE PTU Nov 2016 Paper
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Download Previous Year PTU University Question Paper of Electric Generation & Economics BTEE-502 5th Sem B.Tech EE PTU Nov 2018 Paper
Roll No. ______________ Total No. of Questions : 09 Total No. of Pages : 02 B.Tech.(EE) (2011 Onwards) / (EE) PTU B.Tech. (Electrical & Electronics) (2011 & 2012 Batch) (Sem.–5) ELECTRIC GENERATION AND ECONOMICS Subject Code : BTEE-502 Paper ID : [ A2108]Time : 3 Hrs. Max. Marks : 60
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Electric Generation & Economics BTEE-502 5th Sem B.Tech EE PTU Nov 2018 Paper
SECTION-A
Q1. Write Short Notes on :
a) Which type of power plants always operate as base load plants and why?
b) What type of information is obtained from mass curve?
c) Show that the heat rate curve and incremental rate curve cross each other at a point having minimum heat rate.
d) What are the objectives of tariff?
e) Draw a labeled graph showing straight line method of determination of depreciation.
f) What are the advantages of combined operation of hydro-electric and thermal power plants?
g) What are the disadvantages of low power factor?
h) “Higher the values of load factor and diversity factor, lower will be the overall cost per unit generated”. Justify the statement.
i) Why the problems of disposal, transport and storage of liquid radio-active wastes are extremely significant in case of nuclear power plants?
j) What is main difference between topping and bottoming cycles used for cogeneration?
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. Briefly discuss organization of power sector in India.
3. Write a note on factors affecting aquatic ecosystems.
4. A single phase motor connected to 400V, 50 Hz supply takes 31.7A at a power factor of 0.7 Lagging. Calculate the capacitance required in parallel with the motor to raise the power factor to 0.9 lagging. Draw phasor diagram also.
5. The capital cost of a hydro-power station of 50 MW capacity is Rs 1,000 per kW. The annual depreciation charges are 10% of the capital cost. A royalty of Re 1 per kW per year and Re 0.01 per kWh generated is to be paid for using the river water for generation of power. The maximum demand on the power station is 40 MW and annual load factor is 60%. Annual cost of salaries, maintenance charges etc. is Rs 7,00,000. If 20% of this expense is also chargeable as fixed charges, calculate the generation cost in two part form.
6. Write a note on selection of plant size and number of units in power plants.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
1. A generation station of 1MW supplied a region which has the following demands :
From
To demand (kW)
midnight to 5 am
100
5 am to 6 pm
No-load
6 pm to 7 pm
800
7 pm to 9 pm
900
9 pm to midnight
400
Neglect transmission line losses and find the following :
a) Plot the daily load curve and the load duration curve.
b) Find the load factor, the reserve capacity, plant capacity factor, plant use factor, the hours that the plant has been off and utilization factor.
8. With the help of a diagram, derive expressions for coordinating equations for economic load dispatch considering transmission losses.
9. Write a note on long term operational aspects of hydro-thermal power plants.
Single phase motor connected to 400V, 50 Hz supply takes 31.7A at a power factor of 0.7 Lagging. Calculate the capacitance required in parallel with the motor to raise the power factor to 0.9 lagging.
Capital cost of a hydro-power station of 50 MW capacity is Rs 1,000 per kW. The annual depreciation charges are 10% of the capital cost. A royalty of Re 1 per kW per year and Re 0.01 per kWh generated is to be paid for using the river water for generation of power. The maximum demand on the power station is 40 MW and annual load factor is 60%. Annual cost of salaries, maintenance charges etc. is Rs 7,00,000. If 20% of this expense is also chargeable as fixed charges, calculate the generation cost in two part form.
Selection of plant size and number of units in power plants.
Electric Generation & Economics 5th Sem B.Tech EE PTU Nov 2018 Paper
Electric Generation & Economics 5th Sem B.Tech EE PTU Nov 2018
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Long term operational aspects of hydro-thermal power plants.
Electric Generation & Economics 5th Sem B.Tech EE PTU Nov 2018 Paper
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Download Previous Year PTU University Question Paper of Asynchronous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 Paper
B.Tech.(EE-2011 Batch)
ASYNCHRONOUS MACHINES
Subject Code : BTEE-401 Paper ID : [ A1208]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper
SECTION-A
Q1. Write Short Notes on :
a. In a 4-pole, 3-phase, 50 Hz induction machine, the slip-rings of the machine are open- circuited. The frequency of the voltage across slip-rings is 75 Hz. Find the speed at which the rotor is driven. b. The no-load speed of a 3-phase 50 Hz induction motor is 1485 rpm. Find the number of alterations per minute which the rotor emf will make and the speed of rotor mmf with respect to rotor wound. c. The stator of a 4-pole, 3-phase induction machine is supplied from 3-phase, 50 Hz supply and a prime-mover drives its rotor at a speed of 750 rpm. The slip-rings of the machine are open-circuited. Find the frequency of the voltage across any two slip-rings. d. What are the limitations of induction generator? e. State the condition for maximum torque in a 3-phase induction motor. f. The rotating fields of the stator and rotor are stationary with respect to each other. Justify the statement. g. What happens to a 3-phase induction motor if one of its three supply-leads gets disconnected? h. A 6-pole, 50 Hz single-phase induction motor runs at a speed of 900 rpm. Calculate the frequency of current in the cage rotor. i. In a 3-phase induction motor, maximum torque of 100 Nm occurs at a slip of 10%. Calculate the torque at a slip of 5%. j. Why does a 3-phase induction motor always run at a speed less than the synchronous speed?
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. A 3-phase induction motor crawls near half synchronous speed. Give the reasons. 3. A 3-phase cage rotor induction motor has a full load slip at 4%. The standstill current at rated voltage is 6.5 times full load current. Find auto transformer tapping to give full load torque at starting and also find line current at starting. 4. Explain how the stationary, pulsating m.m.f. wave of a single phase induction motor can be considered as equivalent to two equal but oppositely rotating m.m.f. waves. 5. Describe the constructional features and working of stepper motor. 6. Describe various methods of excitation of induction generator.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. An 1100 V, 50 Hz star connected induction motor has a star connected slip-rings rotor with a transformation ratio of 3.8 the rotor resistance per phase is 0.012 . and leakage inductance is 0.8 mH per phase. Neglect’ stator impedance. Find (a) the rotor starting current per phase with slip rings short circuited, (b) the rotor power factor at starting, (c) the external resistance per phase to obtain a starting current of 100A in the stator and (d) the rotor current at 4% slip. 8. Explain, how the equivalent circuit of an ordinary polyphase induction motor is also applicable to deep-bar induction motors. 9. Explain the working of universal motor and draw its phasor diagram.
4-pole, 3-phase, 50 Hz induction machine, the slip-rings of the machine are open- circuited. The frequency of the voltage across slip-rings is 75 Hz. Find the speed at which the rotor is driven.
No-load speed of a 3-phase 50 Hz induction motor is 1485 rpm. Find the number of alterations per minute which the rotor emf will make and the speed of rotor mmf with respect to rotor wound.
Stator of a 4-pole, 3-phase induction machine is supplied from 3-phase, 50 Hz supply and a prime-mover drives its rotor at a speed of 750 rpm. The slip-rings of the machine are open-circuited. Find the frequency of the voltage across any two slip-rings.
3-phase cage rotor induction motor has a full load slip at 4%. The standstill current at rated voltage is 6.5 times full load current. Find auto transformer tapping to give full load torque at starting and also find line current at starting.
How the stationary, pulsating m.m.f. wave of a single phase induction motor can be considered as equivalent to two equal but oppositely rotating m.m.f. waves.
Various methods of excitation of induction generator.
Asynchronous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 Paper
Asynchro
nous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 Paper
Get Started
https://www.youtube.com/watch?v=UHX6f8TIvX8https://www.youtube.com/watch?v=M_RR6LVICp0https://www.youtube.com/watch?v=mV41CMWonN4https://www.youtube.com/watch?v=s0LVPE0Q3LE&list=PLA9Q9SDZ781WXNAWit379A4CRLMvjGiUw&index=14&t=0s
1100 V, 50 Hz star connected induction motor has a star connected slip-rings rotor with a transformation ratio of 3.8 the rotor resistance per phase is 0.012 Ohm. and leakage inductance is 0.8 mH per phase. Neglect’ stator impedance.
Working of universal motor and draw its phasor diagram.
Asynchronous Machines 4th Sem B.Tech EE PTU Nov 2018 Paper
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Engineering Classes Upload Lecture for Polytechnic Diploma classes in any stream like ECE,EE,ME and Civil Engineering
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er.jaswinder kumar
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