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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be
Less than 50 %
Any where between 75 % and 90 %.
Around 90 %
Around 100 %.
Less than 50 %
Any where between 75 % and 90 %.
Around 90 %
Around 100 %.
Answer
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Related Question
Electrical Machines
Which motor cannot be started on no load?
both B and C
shunt motors
cumulative compound motors
series motors
both B and C
shunt motors
cumulative compound motors
series motors
Answer
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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.
266.20 N-m.
133.22 N-m
can not be determined.
234.76 N-m.
266.20 N-m.
133.22 N-m
can not be determined.
234.76 N-m.
Answer
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Electrical Machines
In DC machines shape of net flux density is?
sine wave
saddle shape
flat tapped or trapezoidal
peaky in nature
sine wave
saddle shape
flat tapped or trapezoidal
peaky in nature
Answer
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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is
2, 3
1, 3
2, 4
1, 4
2, 3
1, 3
2, 4
1, 4
Answer
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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of
mechanical losses.
ohmic losses.
eddy current losses.
hysteresis losses.
mechanical losses.
ohmic losses.
eddy current losses.
hysteresis losses.
Answer
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