D.C. Motors MCQ Questions & Answers | Electrical Engineering

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66.
Hopkinson's test on D.C. machines is conducted at

A. No load

B. Part load

C. Full load

D. Overload

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67.
Regenerative method of braking is based on that

A. Back e.m.f. is less than the applied voltage

B. Back e.m.f. is equal to the applied voltage

C. Back e.m.f. of rotor is more than the applied voltage

D. None of the above

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68.
In the D.C. motor the iron losses occur in

A. The field

B. The armature

C. The brushes

D. The commutator

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69.
In which of the following applications D.C. series motor is invariably tried?

A. Starter for a car

B. Drive for a water pump

C. Fan motor

D. Motor operation in A.C. or D.C.

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70.
In D.C. machines fractional pitch winding is used

A. To improve cooling

B. To reduce copper losses

C. To increase the generated e.m.f.

D. To reduce the sparking

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D.C. Motors MCQ Questions & Answers | Electrical Engineering

66. Hopkinson's test on D.C. machines is conducted at

Answer & Solution

67. Regenerative method of braking is based on that

Answer & Solution

68. In the D.C. motor the iron losses occur in

Answer & Solution

69. In which of the following applications D.C. series motor is invariably tried?

Answer & Solution

70. In D.C. machines fractional pitch winding is used

Answer & Solution

Read More Section(D.C. Motors)

66.
Hopkinson's test on D.C. machines is conducted at

67.
Regenerative method of braking is based on that

68.
In the D.C. motor the iron losses occur in

69.
In which of the following applications D.C. series motor is invariably tried?

70.
In D.C. machines fractional pitch winding is used