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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be
2 .1 Ω
3.1 Ω
1.8 9 Ω
1.79 Ω
2 .1 Ω
3.1 Ω
1.8 9 Ω
1.79 Ω
Answer
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Related Question
Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?
Shaded pole motor.
PSC (permanent split capacitor) motor.
None of these
Split phase motor.
Shaded pole motor.
PSC (permanent split capacitor) motor.
None of these
Split phase motor.
Answer
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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is
115 V.
460 V.
200 V.
230 V.
115 V.
460 V.
200 V.
230 V.
Answer
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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause
negative sequence current.
less heating of the rotor.
all of these.
less heating of the rotor.
negative sequence current.
less heating of the rotor.
all of these.
less heating of the rotor.
Answer
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Electrical Machines
Ideal value of voltage regulation of a device is?
∞
a finite negative value
a positive finite value
0
∞
a finite negative value
a positive finite value
0
Answer
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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?
1000 rpm
950 rpm
975 rpm
940 rpm
1000 rpm
950 rpm
975 rpm
940 rpm
Answer
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