B.TechSemester 42022-23Electrical Machines IKEE-402
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Electrical Machines I (KEE-402) - AKTU Question Paper 2022-23

B.Tech · Semester 4 · Free PDF Download

This is the official AKTU Electrical Machines I Previous Year Question Paper for B.Tech Semester 4, 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 4
Session:2022-23
University:AKTU / UPTU

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Questions Asked in 2022-23

Electrical Machines I (KEE-402) — complete question paper

Section AAttempt all questions in brief. 2 x 10 = 20
  • a
    A magnetic circuit is used as a coupling medium for electromechanical energy conversion. State the reason
  • b
    Develop a block diagram indicating the process of electromechanical energy conversion
  • c
    The role of the commutator in the DC machine is that of a mechanica l rectifier. Justify the statement
  • d
    Differentiate between the lap and wave windings emp loyed in armature windings of a DC machine
  • e
    Enumerate the types of speed control in DC machines
  • f
    Justify the necessity of starters in the operation of DC motors
  • g
    State and prove the condition for maximum efficiency of a transformer
  • h
    Discuss the significance of voltage regulation in t ransformers. How the same is arrived at? (i) State the conditions for parallel operations of transformers. (j) Draw the connection diagram for a 3-phase to 2-phas e conversion. Name the connection of such a configuration
Section BAttempt any three of the following: 10x3=30
  • a
    Distinguish between singly-excited and doubly-excit ed systems. For a singly- excitedlinear magnetic system, derive an expression for the electromagnetic torque
  • b
    Draw the magnetization, internal and externalcharac teristics of DC shunt generator
  • c
    Describe a 3-point starter,having a no-volt coil an d overload protection for a dc shunt motor.What modification ismade in a 4-point starter?
  • d
    Develop the equivalent circuit of a two -winding transformer
  • e
    Discuss the open–Delta connection in 3- Φ transformers with reference to the VArating. Draw the connection diagram of the open-d elta connection and the phasordiagram corresponding to a balanced load of l agging power factor. State the applications
Section CAttempt any one part of the following: 10x1=10
  • a
    Discussthe components of electro-mechanical torque produced in a doubly excited system with suitable derivation
  • b
    Based on the principle of conservation of energy, d evelop an energy balance equation for a motor, Also explain the various energy terms involved
  • a
    Explain the commutation process in D.C. machines citing the causes of poor Commutation. What are the ways of improving the commutation process?
  • b
    (i) Draw the external characteristics and state the applications of compound generators based on the characteristics. (ii) A 440 V, D.C compound generator has an armatur e winding, series field, and shunt field resistances of 0.5 Ω , 1.0 Ω , and 200 Ω respectively. Calculate the generated voltage while delivering 40A to the external circui t for both long and short shunt connection s
  • b
    Explain Swinburne’s test to estimate no -load losses in a DC machine. What are its limitations as compared to Hopkinson’s test
  • b
    A three-phase transformer bank consisting of three 1-phase transformers is used tostep down the voltage of a 3-phase, 6600 V t ransmission line. If the primary linecurrent is 10A, calculate the secondary line voltage, line current, and output kVA forthe connections of star-delta (Y-Δ). Turns ratio is 12

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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