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Roll No. [T TTTTTT] [ ] Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Electrical & Electronics Engg.) (2013 Onwards)/
B.Tech.(Electronics & Electrical Engg.) (2013 & Onwards)
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(Sem.-4)
ELECTRICAL MACHINERY-II
Subject Code : BTEEE-401
M.Code : 72385
Time : 3 Hrs. Max. Marks : 60
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INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
SECTION-A
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- Answer briefly :
- Define the voltage regulation of a synchronous generator.
- Define Pole Pitch of the synchronous generator.
- What are the advantages of brushless DC motor?
- Define Hunting and oscillations in synchronous machines.
- What is the purpose of starters used in three phase induction motor?
- By which test synchronous reactance of synchronous machine is determined.
- How can the direction of capacitor run motor be reversed?
- What is meant by plugging in three phase induction motor?
- In what ratio line current and starting torque is reduced with star-delta starting of three phase induction motor?
- What is the specialty of universal motor?
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SECTION-B
- A 3 phase, 50 Hz, 8 pole synchronous generator has a star connected armature winding with 120 slot and 8 conductors per slot. The flux per pole is 0.05 Wb, sinusoidally distributed. Determine the phase and line voltages.
- Explain the construction details of squirrel cage and slip ring rotor induction motor. Compare the merit and demerit of each type of motor.
- What is infinite bus? State the characteristics of an infinite bus. What are the operating characteristics of an alternator connected to an infinite bus?
- Draw the equivalent circuit of three phase induction motor, also explain torque slip characteristics.
- Explain the double field revolving theory used in single phase induction motor.
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SECTION-C
- Explain the working principle of capacitor start single - phase induction motor. Why should be the auxiliary winding in a capacitor start motor be disconnected after the motor has picked up speed?
- A 10kW, 400V, 4 pole delta connected squirrel cage induction motor gave the following test results :
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No-load test : 400V, 8A, 250W
Blocked rotor test : 90V, 35A, 1350W
The dc resistance of the stator winding per phase measured immediately after the blocked rotor test is 0.6ohm. Calculate the rotational losses and the equivalent circuit parameters. - A 3 phase squirrel cage induction motor with an applied voltage of 40% gives a blocked rotor current of 250% and internal starting torque of 30% of their corresponding rated values. If an auto transformer limits the starting line current to 150% of the motor full load current, compute the percentage starting torque.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 March (All Branches)
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