Electrical Engineering · all questions

D.C. Motors
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122

Questions

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Q101

Usually wide and sensitive speed control is desired in case of

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Q102

Which one of the following is not the function of pole shoes in a D.C. machine?

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Q103

Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?

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Q104

When the armature of a D.C. motor rotates, e.m.f. induced is

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Q105

A three point starter is considered suitable for

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Q106

Which of the following motor has the poorest speed regulation?

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Q107

Which of the following loss in a D.C. generator varies significantly with the load current?

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Q108

As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit

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Q109

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be

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Q110

The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is

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Q111

In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to

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Q112

No-load speed of which of the following motor will be highest?

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Q113

The power mentioned on the name plate of an electric motor indicates

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Q114

If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor

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Q115

D.C. generators are normally designed for maximum efficiency around

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Q116

In D.C. motor which of the following can sustain the maximum temperature rise?

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Q117

In variable speed motor

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Q118

If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking

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Q119

If a D.C. motor is to be selected for conveyors, which motor would be preferred ?

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Q120

For a D.C. shunt motor if the excitation is changed

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