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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because
the motor may run away.
the starting torque becomes low.
the starting current will be enormously high.
the motor may not start.
the motor may run away.
the starting torque becomes low.
the starting current will be enormously high.
the motor may not start.
Answer
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Related Question
Electrical Machines
The condition for maximum running torque is
R = S.X
0.5 lagging
0.707 lagging
zero
unity
R = S.X
0.5 lagging
0.707 lagging
zero
unity
Answer
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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase
rotor resistance
None of these
supply frequency
supply voltage
rotor resistance
None of these
supply frequency
supply voltage
Answer
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Electrical Machines
DC Motor
dc series motor.
dc compound motor.
dc shunt with armature resistance control.
dc shunt motor with field weakening.
dc series motor.
dc compound motor.
dc shunt with armature resistance control.
dc shunt motor with field weakening.
Answer
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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.
440 volt.
240 volt.
220 volt.
230 volt.
440 volt.
240 volt.
220 volt.
230 volt.
Answer
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Electrical Machines
The power factor of squirrel cage induction motor is
both A and B
low at rated load only
low at heavy loads only
low at light loads only
both A and B
low at rated load only
low at heavy loads only
low at light loads only
Answer
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