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Electrical Machines
The output indicate on the name plate of any motor is always the
Output power at the shaft.
Power drawn in KW.
Power drawn in KVA.
Gross power.
Output power at the shaft.
Power drawn in KW.
Power drawn in KVA.
Gross power.
Answer
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Related Question
Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping
Rf maximum and Ra minimum
Ra maximum and Rf minimum
Ra maximum and Rf maximum
Ra minimum and Rf minimum
Rf maximum and Ra minimum
Ra maximum and Rf minimum
Ra maximum and Rf maximum
Ra minimum and Rf minimum
Answer
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Electrical Machines
Which of the following statements are correct ?
The leakage reactance of the induction motor should be small.
None of these
Both 1 and 2.
A small value of leakage reactance will increase the maximum power output of motor.
The leakage reactance of the induction motor should be small.
None of these
Both 1 and 2.
A small value of leakage reactance will increase the maximum power output of motor.
Answer
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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?
16.55 Nm
15.6 Nm
Zero
15.28 Nm
16.55 Nm
15.6 Nm
Zero
15.28 Nm
Answer
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Electrical Machines
In a stepper motor the detente torque means
maximum of the static torque with the phase winding excited.
minimum of the static torque with the phase winding unexcited.
minimum of the static torque with the phase winding excited.
maximum of the static torque with the phase winding unexcited.
maximum of the static torque with the phase winding excited.
minimum of the static torque with the phase winding unexcited.
minimum of the static torque with the phase winding excited.
maximum of the static torque with the phase winding unexcited.
Answer
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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of
ohmic losses.
hysteresis losses.
eddy current losses.
mechanical losses.
ohmic losses.
hysteresis losses.
eddy current losses.
mechanical losses.
Answer
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