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
Get Started
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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
Get Started
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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
Get Started
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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
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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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