Related Questions

A 4 pole 50 Hz induction motor is running at 1300 rpm. Find the speed of stator magnetic field with respect to the rotor?
A 200 rpm
B 1500 rpm
C 1300 rpm
D 1700 rpm
In which of the following motors the stator and rotor magnetic field rotate at the same speed ?
A Universal motor
B Synchronous motor
C Induction motor
D Reluctance motor
In which of the following motors the stator and rotor fields rotate simultaneously ?
A D.C. motor
B Reluctance motor
C Universal motor
D Synchronous motor
When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor
A remains same as the original value
B decreases to half the original value
C tends to becomes zero
D increases to two times the original value
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as
A locked-rotor torque
B synchronous torque
C pull up torque
D reluctance torque
Multipolar neurons are
A Purkinje cells of the cerebellum
B Pyramidal cells of the cerebrum
C Amacrine cells of the retina
D Brush cells of the cochlear nucleus
E Olfactory receptor cells of the nasal mucosa
Multipolar neurons are found in the
A Motor cells of the spinal cord
B Peripheral nerves
C Posterior root ganglia
D Vestibular ganglia
E Retina
The standard full-load power factor ratings for synchronous motors are
A zero or 0.8 leading
B unity or 0.8 lagging
C unity or 0.8 leading
D unity or zero
The power input to an induction motor is 50 kW when it is running at 4% slip. If the stator resistance and core losses are neglected, the rotor copper loss is
A 30 kW
B 20 kW
C 2 kW
D 4 kW
A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A remain same
B go down
C improve
D none of the above

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