In a A.C. series motor armature coils are usually connected to commutator
through resistance
solidly
through capacitors
through reactances
through resistance
In a capacitor start motor the phase displacement between starting and running winding can be nearly
90°
30°
10°
60°
90°
In a split phase motor the running winding should have
low resistance as well as low inductance
low resistance and high inductance
high resistance and low inductance
high resistance as well as high inductance
low resistance and high inductance
If the capacitor of a single-phase motor is short-circuited
the motor will not start
the motor will run
the motor will run in reverse direction
the motor will run in the same direction at reduced r.p.m.
the motor will not start
The rotor developed by a single-phase motor at starting is
less than the rated torque
rated torque
more than i.he rated torque
zero
zero
Which of the following motor will give relatively high starting torque ?
Capacitor run motor
Split phase motor
Capacitor start motor
Shaded pole motor
Capacitor start motor
In capacitor start single-phase motors
current in the starting winding leads the voltage
none of the above
current in the starting winding is in phase with voltage in running winding
current in the starting winding lags the voltage
current in the starting winding leads the voltage
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
improve power factor
reduce fluctuations in torque
increase overload capacity
to improve torque
improve power factor
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will
start and run at rated speed
not start at all
start and then stop
start and run slowly
not start at all
Which of the following motors is used in mixies ?
Universal motor
Repulsion motor
Reluctance motor
Hysteresis motor
Universal motor
पोस्ट अच्छी लगी हो तो प्लीज नीचे दिए गए लिंक पर क्लिक कर शेयर जरुर करें
0 Comments