Electrical Machines Ii (BEE503) - AKTU Question Paper 2024-25
B.Tech · Semester 5 · Free PDF Download
This is the official AKTU Electrical Machines Ii Previous Year Question Paper for B.Tech Semester 5, academic session 2024-25. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 5
Session:2024-25
University:AKTU / UPTU
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Questions Asked in 2024-25
Electrical Machines Ii (BEE503) — complete question paper · 70 marks · 3 Hours
Section AAttempt all questions in brief. 2 x 07 = 14
- aWhy is rotating field system is used in preference to a statio nary field in alternators?
- bWhat are the effects of h unting in synchronous motor? CO
- cWhy cannot an induction motor run at synchronous speed? CO
- dHow universal motor wor ks on AC or on Dc supply? CO
- eExplain cogging and crawling in t hree phase induction motors. CO
- fDefine slip in Induction motor. A three phase, 50 Hz, 4-pole induction motor has a slip of 4%. Calculate the speed of the motor in r.p.m
- gWhat is the function of synchronous condenser? CO
Section BAttempt any three of the following: 07 x 3 = 21
- aDerive the EMF equation of alternator. Explain the armature reaction in synchronous machines at (i) unity power factor, (ii) lagging power factor and (iii) leading power factor
- bExplain why the synchronous mot or does not have a starting t orque? Describe the working principle and methods of starting of a synchronous motor
- cDerive the torque equation of three phase induction motor. A lso find the condition for maximum torque. A 746 kW, 3-phase, 50 Hz, 16 pole induction motor has a rotor impedance of (0.02 + j0.15)Ω at standstill. Find the speed of the motor at which maximum torque occurs
- dWhat are the advantages of high-torque cage motors? Explain Deep-Bar cage motors and Double – Cage motors
- eWhy single phase induction moto rs are not self starting? Explain Double revolving field theory of single phase induction motors
Section CAttempt any one part of the following: 07 x 1 = 07
- aExplain voltage regulati on in synchronous generators. A 3-phase, 10 kVA, 400 V, 50Hz star connected alternator suppli es the rated load at 0.8 power factor lagging. If the armature impedan ce is (0.5+j10) Ω , find the voltage regulation using synchronous imp edance method
- bExplain parallel operation of alternators. What are the reasons of parallel operation? Also describe the nec e s s a r y c o n d i t i o n f o r p a r a l l e l i ng alternators
- aExplain the following for a synchronous motor: (i) V- Curves (ii) Synchronous condenser
- bExplain Two – Reaction Theory of salient pole synchronous ma chine. Also draw the phasor diagram
- aWhat is the significance of rotating magnetic field in three p h a s e induction motor? Explain the wor king principle of three phase i nduction motor. Also draw the phasor diagram and equivalent circuit
- bA 6-pole, 50Hz, three phase induction motor running on full load develops a useful torque of 150 Nm at a rotor frequency of 1.5H z. Calculate the shaft power output. If the mechanical torque lost in friction be 10 Nm, determine (i) rotor copper loss, (ii) the input to the motor, and (iii) the efficiency. The total stator loss is 700 W
- aWhat is the need of starters in three phase induction motors ? Explain Direct online starter and Auto transformer starter with proper diagram
- bDiscuss briefly the various methods of speed control of thre e phase induction motors
- aWhy single phase induction moto rs are not self starting? Explain Double revolvin
- gfield theory of single phase induction motor
- bExplain the following: (i) Split phase motor (ii) Capacitor – start capacitor – run motor (iii) Shaded pole motor
Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.
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