Related Questions

In a two value capacitor motor, the capacitor used for running purposes is
A air capacitor
B paper spaced oil filled type
C ceramic type
D a.c. electrolytic type
While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is
A Short-circuited
B Open circuited
C Alright
D Leaky
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
A it is comparatively cheaper
B it has almost non-destructible capacitor
C it has low starting as well as running currents at relatively high power factor
D it is quiet in operation
In a capacitor start single-phase motor, when capacitor is replaced by a resistance
A torque will increase
B the motor will consume less power
C motor will run in reverse direction
D motor will continue to run in same direction
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then
A motor will not come up to speed
B motor will not carry the load
C current drawn by the motor will be excessively high
D electrolytic capacitor will, in all probability, suffer break down
A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ?
A Ceramic capacitor
B Mica capacitor
C Both will have identical value of capacitance
D It depends on applied voltage
Which of the following statements regarding reluctance-start motor is incorrect ?
A It is similar to reluctance motor
B It is basically an induction motor and not a synchronous one
C So far as its basic working principle is concerned, it is similar to shaded pole motor
D the air-gap between rotor and salient poles is non- uniform
Which of the following statements regarding a reluctance motor is incorrect ?
A It cannot be reversed, ordinarily
B It requires no D.C. field excitation for its operation
C It is nothing else but a single-phase, salient pole synchronous-induction motor
D Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor
Which of the following statements regarding repulsion-start induction motor is incorrect ?
A It requires more maintenance of commutator and other mechanical devices
B It makes quite a bit of noise on starting
C In fractional horse power motors, it has replaced the capacitor motors
D It is not easily reversed
Which of the following statements regarding hysteresis motor is in incorrect ?
A It is extremely sensitive to fluctuations in supply voltage
B Its high starting torque is due to its high rotor hysteresis loss
C It is extremely quiet in operation
D It accelerates from rest to full-speed almost instantaneously

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