Electrical Machine - II (3150910) MCQs

MCQs of Induction Machines

Showing 1 to 10 out of 95 Questions
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1.

An induction motor is an analogy of ________________

(a)

transformer
(b)

synchronous motor
(c)

universal motor
(d)

rotating transformer
Answer:

Option (d)

2.

What is the function of Stator Frame in Induction Machine?

(a)

To provide Housing & Support
(b)

To provide Protection
(c)

To provide Cooling
(d)

All of the Above
Answer:

Option (d)

3.

Which material used in the Stator Frame & End Bell?

(a)

Cast Iron and/or Cast Aluminum Alloy
(b)

High-grade silicon steel
(c)

Copper
(d)

All of these 
Answer:

Option (a)

4.

What is the general thickness of Stamping used in Stator and Rotor core?

(a)

0.3 - 0.5 mm
(b)

3 - 5 mm
(c)

1 - 2 mm
(d)

No stamping required can use solid core 
Answer:

Option (a)

5.

Why stamping is used in Stator core?

(a)

reduced mechanical loss
(b)

reduced eddy current loss
(c)

reduced hysteresis loss
(d)

reduced copper loss
Answer:

Option (b)

6.

How we can reduce hysteresis loss in an induction motor?

(a)

using stamping
(b)

using high-grade silicon steel (magnetic material)
(c)

using small airgap
(d)

using copper conductor
Answer:

Option (b)

7.

Which of the basic thing required to produce torque in any Motor? 

(a)

Stator  flux (r.m.f)
(b)

Rotor flux
(c)

Both Stator and rotor flux
(d)

interaction between Stator and rotor flux
Answer:

Option (d)

8.

Torque in three-phase induction motor will be produced due to interaction between

(a)

Stator and Rotor flux
(b)

Armature and Field Flux
(c)

Stator and Armature Flux
(d)

Field and Rotor Flux
Answer:

Option (a)

9.

The rotor of a three-phase induction motor can never attain synchronous speed.

(a)

True
(b)

False
(c)

depends on the load condition 
(d)

depends on the supply voltage
Answer:

Option (a)

10.

Which of the following waveform is the waveform of the Rotating magnetic field (r.m.f) Øs produced in the stator?

(a)

Sine Wave
(b)

Cosine Wave
(c)

Trapezoidal Wave
(d)

Constant Magnitude
Answer:

Option (d)

Showing 1 to 10 out of 95 Questions
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