Electrical Machine - II (3150910) MCQs

MCQs of Induction Machines

Showing 41 to 50 out of 95 Questions
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41.

Which of the following will be representing the 𝑻  𝑽𝒔  𝑡 (𝒔)

(a)

A
(b)

B
(c)

C
(d)

D
Answer:

Option (d)

42.

_________ & __________  region is known as the Stable & unstable Region of the Induction motor respectively.

(a)

Low Slip     &     Medium Slip
(b)

Medium Slip     &     High Slip
(c)

High Slip     &     Low Slip 
(d)

Low + Medium Slip     &     High Slip
Answer:

Option (d)

43.

Which of the following figure sequence representing the Motoring, Generating & Breaking Mode respectively?

(a)

ABC
(b)

BCA
(c)

CAB
(d)

AAC
Answer:

Option (a)

44.

Which of the following is the correct sequence of T-N characteristic representing the Effect of Supply voltage variation, Supply frequency variation and rotor resistance variation respectively?

(a)

ABC
(b)

BCA
(c)

CAB
(d)

BAC
Answer:

Option (a)

45.

Which of the following loss is occurred in Induction Motor but not occurred in Transformer?

(a)

Iron (Core) Losses
(b)

Copper (Winding) Losses
(c)

Rotational (Mechanical) Losses
(d)

Stray Losses
Answer:

Option (c)

46.

For induction machines, stray losses are assumed as______ of full load.

(a)

1%
(b)

5%
(c)

10%
(d)

2.5%
Answer:

Option (a)

47.

As per the power flow diagram of three-phase induction motor, The first losses encountered in the machine is  

(a)

friction and Windage losses Pfw
(b)

rotor copper loss Pcu (rotor)
(c)

Stator Iron Loss Pi
(d)

Stator copper loss Pcu (stator)
Answer:

Option (d)

48.

__________ is neglected in three phase Induction motor due to very low ___________

(a)

Rotor copper loss Pcu (rotor),     Frequency
(b)

Rotor Iron Loss Pir,     Frequency
(c)

Stator Iron Loss Pi,     Power Factor
(d)

Stator copper loss Pcu (stator),     Frequency
Answer:

Option (b)

49.

Which of the following is not considered as a No-Load Rotational Losses (all most constant) of a three-phase induction motor?

(a)

Friction and Windage Losses
(b)

Stray Losses
(c)

Iron Losses
(d)

Copper Losses
Answer:

Option (d)

50.

Which of the following equation is true for motor input power?

(a)

𝑃𝑖𝑛=√3 𝑉𝐿 𝐼𝐿  cos⁑∅
(b)

𝑃𝑖𝑛 = π‘†π‘‘π‘Žπ‘‘π‘œπ‘Ÿ 𝑂𝑒𝑑𝑝𝑒𝑑 + π‘†π‘‘π‘Žπ‘‘π‘œπ‘Ÿ πΏπ‘œπ‘ π‘ π‘’π‘ 
(c)

𝑃𝑖𝑛 = π‘…π‘œπ‘‘π‘œπ‘Ÿ 𝐼𝑛𝑝𝑒𝑑(𝑃𝐴𝐺 )+ (𝑃𝑐𝑒𝑠+𝑃𝑖)
(d)

All of these 
Answer:

Option (d)

Showing 41 to 50 out of 95 Questions
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