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Mr. Dubey • 51.43K Points
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Q. 71) Calculate the total heat dissipated in a resistor of 44 Ω when 0 A current flows through it.

(A) 0 w

(B) 2 w

(D) .3 w

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Correct answer:
Option (A) - 0 w

Explanation:

 the resistor is a linear element. it only absorbs real power and dissipates it in the form of heat. the voltage and current are in the same phase in case of the resistor so the angle between v & i is 90°.

Mr. Dubey • 51.43K Points
Coach

Q. 72) The value of slip at which maximum torque occurs

(A) r2÷x2

(B) 4r2÷x2

(D) r2÷3x2

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Correct answer:
Option (A) - r2÷x2

Explanation:

 the maximum torque occurs when the slip value is equal to r2÷x2.

Mr. Dubey • 51.43K Points
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Q. 73)   devices were used for voltage control applications.

(A) cycloconverters

(B) vacuum tubes

(D) induction machine

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Correct answer:
Option (C) - tap changing transformer

Explanation:

 a tap changing transformer can give variable ac from fixed ac without a change in frequency.

Mr. Dubey • 51.43K Points
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Q. 74)   applications.

(A) power generation

(B) electric heating

(D) power transmission

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Correct answer:
Option (B) - electric heating

Explanation:

 in electric heating, variable ac supply is needed. the devices are fired appropriately to apply enough temperature.

Mr. Dubey • 51.43K Points
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Q. 75) In DC motor, which of the following part can sustain the maximum temperature rise?

(A) field winding

(B) commutator

(D) armature winding

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Mr. Dubey • 51.43K Points
Coach

Q. 76) Which power is mentioned on a name plate of a motor?

(A) gross power

(B) power drawn in kva

(D) output power available at the shaft

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Mr. Dubey • 51.43K Points
Coach

Q. 77) The armature shaft of a DC motor must be able to withstand

(A) bending moment due to weight of the armature.

(B) any unbalanced magnetic pull on the armature core.

(D) bending moment, unbalanced magnetic pull and twisting stains

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Mr. Dubey • 51.43K Points
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Q. 78) In DC machines the residual magnetism is present. The order of residual magnetism is

(A) 2 to 3 per cent

(B) 10 to 15 per cent

(D) 50 to 75 per cent

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Mr. Dubey • 51.43K Points
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Q. 79) How many steps are involved in the construction of single phase induction motor?

(A) 3

(B) 4

(D) 6

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Mr. Dubey • 51.43K Points
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Q. 80) What kind of motor employs the skein winding made use of?

(A) maximum horse power single phase induction motor

(B) fractional horse power single phase induction motor

(D) zero horse power single phase induction motor

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Explore Sets

Electrical Drives and Controls (EDC) MCQs Set 1

Electrical Drives and Controls (EDC) MCQs Set 2

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Electrical Drives and Controls (EDC) MCQs Set 20

Electrical Drives and Controls (EDC) MCQs Set 21

Electrical Drives and Controls (EDC) MCQs Set 22

Electrical Drives and Controls (EDC) MCQs Set 23

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