Design of AC Machines (2170909) MCQs

MCQs of Design of Single-Phase Induction Motors

Showing 1 to 10 out of 56 Questions
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1.

What is the phase spread of winding in 1-phase Induction motor?

(a)

60
(b)

90
(c)

120
(d)

180
Answer:

Option (d)

2.

What is the ratio of the output of 1-Φ IM to the output of  3-Φ induction motor?

(a)

1/3
(b)

2/3
(c)

3/2
(d)

1
Answer:

Option (b)

3.

What is the range of Specific Electrica loading in the design of single-phase induction motor?

(a)

5000 - 45000 AT/m
(b)

2500 - 50000 AT/m
(c)

10000 - 60000 AT/m
(d)

5000 - 15000 AT/m
Answer:

Option (d)

4.

What is the range of Specific Megnetic loading in the design of single-phase induction motor?

(a)

0.3 - 0.6 Tesla
(b)

0.45 - 0.55 Tesla
(c)

0.6 - 0.65 Tesla
(d)

0.32 - 0.56 Tesla
Answer:

Option (d)

5.

Which of the following is true for a single-phase induction motor?

(a)

high starting torque
(b)

low starting torque
(c)

average starting torque
(d)

zero starting torque
Answer:

Option (d)

6.

Which of the following starting method is/are associated with single-phase induction motor?

(a)

split phase 
(b)

shaded pole
(c)

repulsion 
(d)

All of these 
Answer:

Option (d)

7.

What are the names of the windings used in the split-phase starting?

(a)

starting windings
(b)

auxiliary windings
(c)

starting or auxiliary windings
(d)

running or main winding 
Answer:

Option (c)

8.

In single-phase induction motor. The running (main) and the starting (auxiliary) windings are ________________ displaced by _________ with each other.

(a)

electrically,     90º
(b)

electrically,     120º
(c)

electrically,     180º
(d)

mechanically,     90º
Answer:

Option (a)

9.

In single-phase induction motor. The required phase displacement between the running and starting windings current is obtained by __________ in series with starting winding.

(a)

connecting a suitable resistor
(b)

connecting a suitable capacitor
(c)

connecting a suitable inductor
(d)

connecting a suitable impedance
Answer:

Option (d)

10.

In single-phase induction motor. The starting winding is cut out of from the circuit when ______________________

(a)

when the motor speed reaches 25 % of the full load speed
(b)

when the motor speed reaches 50 % of the full load speed
(c)

when the motor speed reaches 75 % of the full load speed
(d)

when the motor speed reaches 70 to 80 % of the full load speed
Answer:

Option (d)

Showing 1 to 10 out of 56 Questions
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