B.TechSemester 52022-23Electrical Machine IiKEE503

Electrical Machine Ii (KEE503) - AKTU Question Paper 2022-23

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Electrical Machine Ii Previous Year Question Paper for B.Tech Semester 5, academic session 2022-23. 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:2022-23

University:AKTU / UPTU

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Questions Asked in 2022-23

Electrical Machine Ii (KEE503) — complete question paper

Section AAttempt all questions in brief. 2x10 = 20

a
What are two main types of synchronous generators based on their rotor construction?
b
Why are Alternators rated in kVA and not in kW?
c
What is the functi on of synchronous condenser?
d
What are the effects of h unting in synchronous motor?
e
Define slip in Induction motor
f
Discuss the advantages of squirrel cage induction motor
g
What do you mean by crawli ng in an induction motor?
h
List two methods of speed control in 3-phase induction moto r (i) What are the different types of single-phase induction motors? (j) What is a universal motor?

Section BAttempt any three of the following: 10x3 = 30

a
Explain Potier’s Triangle me thod of determining voltage regulation in cylindrical rotor machine
b
With the help of suitable diagrams discuss why synchronous motors are not self-starting? Also, explain sta rting of synchronous motor by u sing damper winding
c
Discuss the working principl e of 3-phase induction motor. A lso, with neat sketches discuss the construct ion of squirrel cage and wound ro tor 3-phase induction motor
d
What is the need of the star ter in 3-Phase induction motor? With a neat sketch describe autotransformer method of starting
e
The following data shown result on a 230V, 50 Hz capacitor start single phase induction motor at standstill: Main winding : 100V, 2A, 40W Auxiliary winding: 80V, 1A, 50W Determine the value of capacitance for obtaining the maximum starting torque

Section CAttempt any one part of the following: 10x1 = 10

a
A 230V, 3-phase, 5kVA star conn ected salient pole alternato r with X d=12 ohm and Xq=7 ohm delivers full load current at unity power factor. Calcul ate the excitation voltage neglecting resistance
b
With the help of phasor diag rams explain the operation of s ynchronous motor at constant load and variable excitation. Also, draw the V-curv es and state its significance
a
Derive emf equation of alterna tor. Also, define and derive pitch factor and distribution factor
b
A 3-phase, 1500 kVA, star connected 50Hz, 2300 V alternator h a s d c resistance of 0.08 ῼ/phase. Assume that effective resistance/phase is 1.5 times the dc resistance. A field current of 70A produces a short circ uit current equal to full load current of 376A in each line. The same field curre nt produces an emf of 700V on open circuit. Determine the synchronous reactanc e of the machine and its full load regulation at 0.8 pf lagging
a
Sketch and derive the Torque- Slip characteristics of a 3-phase induction motor indicating starting, maximum torque and the operating region. Also, derive the conditions of maximum torque and maximum starting torque
b
An 18.650 kW, 4 pole, 50 Hz, 3-phase induction motor has fr iction and windage loss of 2.5 percent of the output. The full load slip i s 4 %. Compute for full load (i) The rotor copper loss (ii) The rotor input and (iii) The shaft torque
a
What is the purpose of using deep bar cage rotors. Also, de scribe the construction and working of deep bar cage rotors
b
With a suitable circuit diag ram explain cascade operation o f 3-phase induction motor. Derive the relation of speed for cumulative ca scading and differential cascading
a
What is double revolving field th eory?Explain the operation of a single-phase induction motor using double revolving field theory?
b
Discuss the working of (i) Shaded pole motor and (ii) Capacitor-start capacitor-run 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.

Repeated Questions — KEE503

Questions that appeared in more than one session, found by comparing 3 years of Electrical Machine Ii papers (2021-22, 2022-23, 2023-24)

Define slip in Induction motor

Appeared in: 2021-22 · 2022-23 · 2023-24

Derive emf equation of alterna tor. Also, define and derive pitch factor and distribution factor

Appeared in: 2021-22 · 2022-23 · 2023-24

What are two main types of synchronous generators based on their rotor construction?

Appeared in: 2021-22 · 2022-23

What are the effects of h unting in synchronous motor?

Appeared in: 2022-23 · 2023-24

What do you mean by crawli ng in an induction motor?

Appeared in: 2021-22 · 2022-23

Sketch and derive the Torque- Slip characteristics of a 3-phase induction motor indicating starting, maximum torque and the operating region. Also, derive the conditions of maximum torque and maximum starting torque

Appeared in: 2022-23 · 2023-24

Discuss the working of (i) Shaded pole motor and (ii) Capacitor-start capacitor-run motor

Appeared in: 2022-23 · 2023-24

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