Power System-1 BTEE-405 4th Sem B.Tech EE PTU April 2019 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.

Slip of an induction motor.

   

Discuss Slip frequency of a 3-phase induction motor.

   

Explain Why an induction motor operates at a very low power factor under no-load

   

Discuss Why an induction motor cannot run at synchronous speed

   

Two application of single-phase induction motor.

   

Explain Why starting current is high for an induction motor?

   

Elaborate Why airgap between stator and rotor of induction motor is very small.

   

If a single-phase induction motor is started with auxiliary winding open, what will happen

   

Explain How direction of rotation of a three-phase induction motor can be reversed

    

Difference between a squirrel cage and slip ring induction motor.

Power System-1 4th Sem Batch 2011 B.Tech PTU April 2013 Question Paper 

Losses in a 3-phase induction motor.

 

Explain toque-slip characteristics of 3-phase induction motor.

 

Starting of squirrel cage induction motor by using Direct-on-line method.

 

How higher starting torque can be obtained in : a. Squirrel cage induction motor

b. Wound rotor 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

Constructional features, working principle and applications of single-phase reluctance motor.

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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