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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 AC generator
 DC generator
 induction motor
 DC motor

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Electrical Machines
In case of DC shunt motor if load is reduced

  The speed will remains almost constant.
 The speed will increase in proportion to reduction in load.
 DC Shunt Motor
 The speed will increase abruptly.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 40 V
 20 V
 zero

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Copper losses
 Both 1 and 2
 Eddy current losses

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Electrical Machines
No load saturation characteristics are plotted between

 short circuit current and field current
 no load voltage and armature current
 no load voltage and field current
 short circuit current and armature current

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Electrical Machines
Generators work on the principle of production of

None of these
 dynamically and statically induced emf.
 dynamically induced emf.
 statically induced emf.

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MORE MCQ ON Electrical Machines

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