Design of AC Machines (2170909) MCQs

MCQs of Design of Three Phase Induction Motor

Showing 21 to 30 out of 97 Questions
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21.

What is the value of Specific Magnetic loading for Large Overload Capacity three-phase induction motor design? 

(a)

0.03 - 0.06 Tesla
(b)

0.3 - 0.6 Tesla
(c)

0.45 - 0.55 Tesla
(d)

0.6 - 0.65 Tesla
Answer:

Option (d)

22.

What is the range of Specific Electrica loading in the design of three-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 (a)

23.

The power factor & Overload capacity of the machine decrease with ____________

(a)

increase in magnetizing current
(b)

decrease in magnetizing current
(c)

increase in machine size 
(d)

decrease in machine size 
Answer:

Option (a)

24.

Which of the following factors are affected by the selection of Specific Electric Loading?

(a)

Copper losses
(b)

Overload Capacity
(c)

Voltage
(d)

All of these 
Answer:

Option (d)

25.

Induction Motor is known as Rotating transformer with an ______________ and ______________.

(a)

air gap & short-circuited secondary
(b)

air gap & Open-circuited secondary
(c)

Core Less & short-circuited secondary
(d)

Core Less & Open-circuited secondary
Answer:

Option (a)

26.

No-load current in three-phase induction motor is Very  __________ due to presence of an _________ .

(a)

Large,   Core Less
(b)

Small,   Air-gap
(c)

Large,   Air-gap
(d)

Small,   Core Less
Answer:

Option (c)

27.

In a three-phase induction motor, the space between __________ is known as Length of the Air gap

(a)

stator teeth and rotor teeth 
(b)

Stator Slot and Rotor Teeth
(c)

Stator Teeth and Rotor Slot
(d)

All of these
Answer:

Option (a)

28.

Which of the following Performance parameter of the three-phase induction motor is/are disadvantage/s of the large air gap length?

(a)

Overload capacity
(b)

Pulsation losses, Noise, & Unbalanced Magnetic Pull
(c)

Cooling
(d)

Power Factor
Answer:

Option (d)

29.

Which of the following is correct with increased in the length of air-gap?

(a)

MMF for Air Gap  (↑)
(b)

Magnetizing Current (↑) and No-load Current (↑)
(c)

Power Factor (↓)
(d)

All of these 
Answer:

Option (d)

30.

Which of the following is not correct with increased in the length of air-gap?

(a)

zigzag leakage flux (↑)
(b)

leakage reactance (↓)
(c)

the diameter of the circle diagram (↑)
(d)

Over Load Capacity (↑)
Answer:

Option (a)

Showing 21 to 30 out of 97 Questions
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