Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (EEE)- Electrical And Electronics Engineering 2020 December 4th Sem 77607 Electrical Machines Ii Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (Electrical Engineering) (2018 Batch) (Sem.?4)
ELECTRICAL MACHINES-II
Subject Code : BTEE-402-18
M.Code : 77607
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
1.
Answer the following in short :
a) What is Distribution Factor?
b) What is active portion and what is overhang in the coils?
c) What is Revolving Magnetic Field?
d) What is MMF?
e) What is the function of stator and rotor in the machine?
f) What information we get from power flow diagram?
g) What is Voltage Regulation?
h) What do you understand from self excitation?
i) What is Zero Power Factor?
j) What is Alternator?
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SECTION-B
2.
Explain and show the physical arrangement of windings in stator and cylindrical rotor.
What is the difference between difference between concentrated winding and distributed
windings?
3.
What is the difference between constant magnetic field and pulsating magnetic field?
Explain the pulsating magnetic field produced by spatially displaced windings.
4.
What is Squirrel Cage Motor? Explain torque slip characteristics of induction machine.
5.
Explain methods of starting and braking of induction machine.
6.
Give equivalent circuit and phasor diagram of synchronous machine. Also discuss
armature reaction at different power loads.
SECTION-C
7.
What is Synchronous Machine? What are its constructional features? Explain the
operating characteristics of synchronous machine. Also explain the V-curves and
inverter-V curves. What is hunting?
8.
Explain the following :
a) Parallel operation of alternators
b) Doubly fed induction machine
9.
What are Pulsating and Revolving Magnetic Fields? Explain the magnetic field
produced by single winding both for fixed current and alternating current. If the windings
are spatially shifted by 90 degrees.
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 post was last modified on 13 February 2021