Vacuum cleaners
Fan motors
Pistol drills
All of the above
Answer is Right!
Answer is Wrong!
Detailed SolutionWhich of the following applications always have some load whenever switched on ?
Single phase induction motors
92. In a split phase motor, the running winding should have
high resistance and low inductance
low resistance and high inductance
high resistance as well as high inductance
low resistance as well as low inductiance
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Answer is Wrong!
Detailed SolutionIn a split phase motor, the running winding should have
93. In which single-phase motor, the rotor has no teeth or winding ?
Split phase motor
Reluctance motor
Hysteresis motor
Universal motor
Answer is Right!
Answer is Wrong!
Detailed SolutionIn which single-phase motor, the rotor has no teeth or winding ?
94. A centrifugal switch is used to disconnect starting winding when motor has
run for about 1 minute
run for about 5 minutes
picked up about 50 to 70 per cent of rated speed
picked up about 10 to 25 per cent of rated speed
Answer is Right!
Answer is Wrong!
Detailed SolutionA centrifugal switch is used to disconnect starting winding when motor has
95. In repulsion motor direction of rotation of motor
Is opposite to that of brush shift
Is the same as that of brush shift
Is independent of brush shift
nan
Answer is Right!
Answer is Wrong!
Detailed SolutionIn repulsion motor direction of rotation of motor
96. Which of the following statements regarding repulsion-start induction motor is incorrect ?
It requires more maintenance of commutator and other mechanical devices
It makes quite a bit of noise on starting
In fractional horse power motors, it has replaced the capacitor motors
It is not easily reversed
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Answer is Wrong!
97. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will
Become unstable
Draw excessive armature current and may burn out
Fall out of synchronism and come to stand still
Run as induction motor
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Answer is Wrong!
98. In a
through resistance
through reactances
series motor armature coils are usually connected to commutator A. through resistance B. through reactances C. through capacitors
solidly
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Answer is Wrong!
99. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in
Damage to the starting winding
Damage to the centrifugal switch
Overloading of running winding
None of the above
Answer is Right!
Answer is Wrong!