Roll No. Total No. of Pages : 02
Total No. of Questions : 09
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B.Tech.(EE)PT/(EE) (2011 Onwards)
B.Tech.(Electrical & Electronics) (2011 & 2012 Batch)
B.Tech. (Electrical Engineering & Industrial Control) (2012 Onwards)
(Sem.=-5)
SYNCHRONOUS MACHINES
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Subject Code : BTEE-501
M.Code : 70554
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION 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.
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SECTION-A
Q1 Answer briefly :
- Define synchronous impedance of an alternator.
- What is excitation voltage of an alternator?
- Why damper winding is provided in salient pole synchronous motor?
- Write the conditions of parallel operation of alternators.
- What is a turbo alternator?
- Define synchronous reactance.
- What is salient pole type synchronous machine?
- What is synchronous condenser?
- What type of voltage is supplied to field of synchronous motor?
- Define transient stability of synchronous machine.
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SECTION-B
- Draw and explain phasor diagram of a cylindrical rotor alternator at leading power factor load.
- Draw and explain the phasor diagrams at lagging power factor for salient pole synchronous motor.
- What is the necessity of computing voltage regulation of an alternator?
- Draw and explain internal and external characteristic of an alternator.
- Describe briefly the construction and application of a hysteresis motor.
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SECTION-C
- Derive the expressions of electromagnetic power, reluctance power and total output power of a salient pole synchronous generator based on its phasor diagram. Draw and explain the power-angle characteristic for this machine.
- Describe the constructional features, working principle and applications of single- phase reluctance motor.
- A 2200 V, 400 kW, 3-phase star connected synchronous motor has a synchronous impedance of 0.3 + j3 ohm. Determine the excitation emf and the power angle if the motor works at rated load at 0.8 power factor leading and with an efficiency of 94%.
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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 Dec 2018 5th Semester Question Papers || Punjab Technical University