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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is
50 Hz
5 Hz
0 Hz
1 Hz
50 Hz
5 Hz
0 Hz
1 Hz
Answer
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Related Question
Electrical Machines
Swinburne's test is applicable to
DC Shunt motor.
DC shunt and level Compound motor.
DC series motor.
DC compound motor.
DC Shunt motor.
DC shunt and level Compound motor.
DC series motor.
DC compound motor.
Answer
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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is
2.2 Ω
6 Ω
5.7 Ω
1.9 Ω
2.2 Ω
6 Ω
5.7 Ω
1.9 Ω
Answer
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Electrical Machines
The ___________________ generator has the poorest voltage regulation.
differential compounded.
under-compounded.
over compounded.
shunt.
differential compounded.
under-compounded.
over compounded.
shunt.
Answer
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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is
100Hz.
200Hz.
50Hz.
150Hz.
100Hz.
200Hz.
50Hz.
150Hz.
Answer
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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will
reduce by 5 %.
depend on other factors.
remain unchanged.
increase by 5 %.
reduce by 5 %.
depend on other factors.
remain unchanged.
increase by 5 %.
Answer
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