1) What is the cause for mechanical overloads in the induction motors?
a. Stalling
b. Blowing of fuse
c. Under voltage
d. Open circuit
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Answer
Explanation
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ANSWER: Stalling
Explanation:
No explanation is available for this question!
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2) Upto what motor ratings, the HRC fuse can be used as a protective device?
a. 500 V
b. 1000 V
c. 1500 V
d. 5000 V
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Answer
Explanation
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ANSWER: 1000 V
Explanation:
No explanation is available for this question!
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3) Which among these devices are used to protect low voltage induction motor?
a. Thermal overload relay
b. HRC fuse
c. Contactor starter
d. All of these
e. None of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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4) Which among these devices are required for manual control of induction motors?
a. Drum controller
b. Face plate starter
c. Toggle switch
d. Only b and c
e. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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5) On what factor does the starting current of the induction motor depend?
a. Starting torque required
b. Losses allowed during starting
c. Both (A) and (B)
d. None of these
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Answer
Explanation
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ANSWER: Both (A) and (B)
Explanation:
No explanation is available for this question!
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6) What results if the rotor bar of a squirrel cage rotor is broken?
a. Noise
b. Low starting torque
c. Rated speed is not reached even with rated voltage and frequency
d. All of these
e. None of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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7) What is the application of ‘inverse torque power output type’ squirrel cage motor?
a. Conveyors
b. Fans
c. Centrifugal pumps
d. Machine tools
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Answer
Explanation
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ANSWER: Machine tools
Explanation:
No explanation is available for this question!
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8) What is the usual voltage range in the slip rings for the induction motor?
a. 50 V to 115 V
b. 100 V to 1 kV
c. Is proportional to the stator voltages
d. None of these
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Answer
Explanation
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ANSWER: 100 V to 1 kV
Explanation:
No explanation is available for this question!
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9) Which among these is not a starting method of induction motor?
a. Direct on line starting
b. Ward Leonard method of starting
c. Thyristor starting control
d. Autotransformer starting
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Answer
Explanation
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ANSWER: Ward Leonard method of starting
Explanation:
No explanation is available for this question!
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10) What is the possible cause if the slip ring induction motor fails to start?
a. Open rheostat
b. Overload
c. Brushes do not touch collector rings
d. Only (b) and (c)
e. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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