Synchronous generator
Synchronous generator
Induction Motor
Induction Motor
100
Salient pole and non-salient pole
What are the types of rotor?
100
120f/P
What is the equation for synchronous speed?
100
The frame of an induction motor is usually made of
Steel
100
1.5Φm
What is the magnitude of resultant flux?
200
10 pole AC generator rotates at 1200 rpm. The frequency of AC voltage in cycles per second will be
100
200
The output frequency of an alternator depends on
Number of poles and synchronous speed
200
The direction of rotor rotation and rotating magnetic field
Same
200
Why Slip cannot be zero?
When s=0, N=Ns, there is no relative speed and hence no emf induced. Rotor stops rotating
300
Pitch factor is the ratio of emf of
300
Which kind of rotor is most suitable for turbo alternators which arc designed to run at high speed ?
Non-salient pole type
300
At what value of Θ, Φa is positive,Φb is zero and Φc is negative
120
300
At what value of Θ, Φa is positive,Φb is negative and Φc is zero
60
400
An alternator is generating power at 210 V per phase while running at 1500 rpm. If the need of the alternator drops to 1000 rpm, the generated voltage per phase will be
140
400
A 3 phase, 50Hz, 20 pole alternator with Y connected stator winding has 180 slots, 8 conductors per slot and coils are full pitched. The flux per pole is 25mWb. Assuming sinusoidally distributed flux, what is the speed and line EMF.
300rpm, 2214.8V
400
The starting torque of a squirrel-cage induction motor is
Low
400
With increase of load, the speed of induction motor operating in the stable region
Increases