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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: Fractional KW Motors of Electrical Machines- 2 - Electrical Engineering (EE) MCQ

Test: Fractional KW Motors of Electrical Machines- 2 - Electrical Engineering (EE) MCQ


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20 Questions MCQ Test - Test: Fractional KW Motors of Electrical Machines- 2

Test: Fractional KW Motors of Electrical Machines- 2 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Fractional KW Motors of Electrical Machines- 2 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Fractional KW Motors of Electrical Machines- 2 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Fractional KW Motors of Electrical Machines- 2 below.
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Test: Fractional KW Motors of Electrical Machines- 2 - Question 1
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A single phase induction motor is

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 1

A single-phase IM is not self starting, therefore an auxilary winding is used to start this motor.

Test: Fractional KW Motors of Electrical Machines- 2 - Question 2
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The capacitor in a capacitor-start induction run ac motor is connected in series with

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 2


Here, C is connected in series with auxiliary winding (or starting winding).

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Test: Fractional KW Motors of Electrical Machines- 2 - Question 3
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Which of the following statements associated with shaded pole induction motor is incorrect?​

Test: Fractional KW Motors of Electrical Machines- 2 - Question 4
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Assertion (A) : In a single phase induction motor, while the motor is connected to single phase ac supply and is rotating, the two fields (stator and rotor field) combine to form a resultant rotating field revolving at a synchronous speed.
Reason (R) : The rotor field created by rotor currents acts at right angle to the stator field and also lags the stator field by 90° electrical degrees in time phase.
Test: Fractional KW Motors of Electrical Machines- 2 - Question 5
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Assertion (A) : Linear induction motor wide use in industry and electric traction.
Reason (R) : Linear induction motors are cheaper in initial as well as in maintenance costs.
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 5

Assertion is true because linear motion induction motors have linear motion due to which they are wide used in industry and electric traction.

Test: Fractional KW Motors of Electrical Machines- 2 - Question 6
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In comparison to a resistance start motor, the capacitor start motor has
1. high starting torque
2. high running torque
3. larger phase difference between two winding currents
4. low starting current
​Out of these, the correct answer is
Test: Fractional KW Motors of Electrical Machines- 2 - Question 7
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The direction of rotation of a shaded pole induction motor
Test: Fractional KW Motors of Electrical Machines- 2 - Question 8
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In various types of split-phase, 1-phase induction motors, the starting torques produced are in the following descending order.
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 8

Shaded pole motor has smallest starting torque and spe e d (1 - 2 rpm) .Tst of capacitor-split phase IM > Tst of resistance-split phase IM.

Test: Fractional KW Motors of Electrical Machines- 2 - Question 9
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Which of the following statements associated with an ac series motor is incorrect?
Test: Fractional KW Motors of Electrical Machines- 2 - Question 10
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Speed of universal motor is
Test: Fractional KW Motors of Electrical Machines- 2 - Question 11
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A single phase reluctance motor
Test: Fractional KW Motors of Electrical Machines- 2 - Question 12
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The torque of a reluctance motor can be effectively decreased by
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 12

Torque developed in a reluctance motor is given by
Te ∝ (Rlq - Rld)
If  Rlq/Rld is less, it means Rlq < RId and thus, Te is less.

Test: Fractional KW Motors of Electrical Machines- 2 - Question 13
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In a single phase hysteresis motor
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 13

In a 1-ϕ hysteresis motor, eddy current torque, Teddy ∝ s and hysteresis
torque = constant
During starting, slip is high, therefore torque developed is due to both eddy current and hysteresis. However, during running condition slip is very low due to which eddy current torque will be very less. Therefore, torque is only due to hysteresis during running condition.

Test: Fractional KW Motors of Electrical Machines- 2 - Question 14
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Match List-I (Type of motors) with List-ll (Application) and select the correct answer using the codes given below the lists:
List-I
A. Shaded pole motor
B. Reluctance motor
C. Universal motor
D. Single phase IM
List-ll
1. Ceiling fan
2. Food mixture
3. Timing and control purposes
4. Toys
Codes:
    A B C D
(a) 4 3 2 1
(b) 2 3 1 4
(c) 3 4 2 1
(d) 2 1 3 4
Test: Fractional KW Motors of Electrical Machines- 2 - Question 15
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Which of the following single phase motor has no teeth or winding?
Test: Fractional KW Motors of Electrical Machines- 2 - Question 16
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Match List-I (Type of motors) with List-ll (Characteristics) and select the correct answer using the codes given below the lists:
List-I
A. Shaded Pole motor
B. Hysteresis motor
C. PMDC motor
D. Capacitor start motor
List-ll
1. Least noise
2. Highest starting torque
3. Lowest speed
4. Used in cassette tape recorder
Codes:
    A B C D
(a) 3 4 2 1
(b) 1 4 2 3
(c) 3 1 4 2
(d) 1 2 3 4
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 16

Capacitor start motor has highest starting toque. Hysteresis motor gives noise less operation.

Test: Fractional KW Motors of Electrical Machines- 2 - Question 17
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Assertion (A): When a ceiling fan using a capacitor run motor is switched on, it hums but does not run. When it is driven by some external means it runs in the direction in which it was made to run.
Reason (R): The capacitor connected in series with the auxiliary winding is short circuited.
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 17

The capacitor might be open circuited due to which no starting torque is developed and motor fails to start.

Test: Fractional KW Motors of Electrical Machines- 2 - Question 18
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The rotor of a stepper motor has
Test: Fractional KW Motors of Electrical Machines- 2 - Question 19
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A stepping motor has four concentric coils on its 4-pole stator. It has an unwound variable reluctance motor with 5 teeth. The step angle for this motor is
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 19

Step size/angle,

Given,
Nr = Number of rotor teeths = 5
m = Number of phase/stacks = 4
∴ 

Test: Fractional KW Motors of Electrical Machines- 2 - Question 20
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A single phase induction motor is running at N rpm. Its synchronous speed is Ns. If its slip w.r.t forward field is s. What is the slip w.r.t. the backward field?
Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 2 - Question 20

Sf= s
Sb=(Ns+N)/Ns
= 1+1-s
=2-s ( As N/Ns = 1-s )

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