Basic Electrical Engineering (3110005) MCQs

MCQs of Electrical Machines

Showing 11 to 20 out of 32 Questions
1 2 3 4
11.
When load is placed on 3-phase induction motor its slip
(a) increases
(b) decreases
(c) remains constant
(d) does not depend on load
Answer:

Option (a)

12.
Capacitor start and run 1-phase IM is basically a
(a) 1-ph induction motor
(b) 2-ph induction motor
(c) 1-ph reluctance induction motor
(d) 3-ph induction motor
Answer:

Option (a)

13.
In case of DC machines, mechanical losses are primary function of
(a) Current
(b) Voltage
(c) Speed
(d) None of the above
Answer:

Option (c)

14.
Brushes of DC machines are made of
(a) Carbon
(b) Soft copper
(c) Hard copper
(d) All of above
Answer:

Option (a)

15.
For a DC machines laboratory following type of DC supply will be suitable
(a) Rotary converter
(b) Mercury arc rectifier
(c) Induction motor DC generator set
(d) Synchronous motor DC generator set
Answer:

Option (c)

16.
The emf generated in a DC generator is directly proportional to
(a) Flux/pole
(b) Speed of armature
(c) Number of poles
(d) All of the above
Answer:

Option (b)

17.
A DC generator can be considered as
(a) Rectifier
(b) Prime mover
(c) Rotating amplifier
(d) Power pump
Answer:

Option (c)

18.
A DC generator works on the principle of
(a) Lenz's law
(b) Ohm's law
(c) Faraday's law of electromagnetic induction
(d) None of the above
Answer:

Option (c)

19.
A DC series motor is that which
(a) has its field winding consisting of thick wire and less turns
(b) has a poor torque
(c) can be started easily without load
(d) has almost constant speed
Answer:

Option (a)

20.
These days DC motors are widely used in
(a) pumping sets
(b) air compressors
(c) electric traction
(d) machine shops
Answer:

Option (c)

Showing 11 to 20 out of 32 Questions
1 2 3 4