101. An induction motor with larger number of slots has _________ overload capacity.
- low
- large
- no effect on
- none of these
102. The three-phase induction motor provided with open slots has
- reduced leakage reactance
- increased starting current, starting torque and breakdown torque
- better pf
- improved efficiency
- both a and b
103. Semiclosed or totally closed slots are used in induction motors essentially to
- improve pull-out torque
- increase pull-out torque
- increase efficiency
- reduce magnetizing current and improve power factor
104. The stator of a small (up to 5 hp)induction motor is provided with
- open slots with parallel teeth
- open slots with tapered teeth
- semi-closed slots with parallel teeth
- totally closed slots with parallel teeth
105. Cogging in induction motor occurs when
- Number of stator teeth – number off rotor teeth = odd number
- Number of stator teeth – number off rotor teeth = even number
- Number of stator teeth – number off rotor teeth = 0
- Number of stator teeth – number off rotor teeth = negative number
106. In a three phase induction motor, the stator slots are
- equal to rotor slots
- exact multiple of rotor slots
- not exact multiple of rotor slots
- none of the above
107. In a three phase induction motor, the number of slots on stator is not kept an exact multiple of number of rotor slots because it
- facilities cooling
- avoids magnetic locking between stator field and rotor
- improves efficiency
- improves pf
108. The difference between the number of stator slots and that of rotor lots in an induction motor should not be equal to P, 2P or 5P. It is essential in order to avoid
- synchronous cusps
- crawling
- magnetic locking
- noise and vibration
109. In induction machines, it is usually a standard practice to employ
- integral slots winding with full pitch coils
- integral slots winding with chorded coils
- fractional slot winding with frictional pitch coils
- frictional slot winding with the full pitch coil
110. The rotor slots in a three phase induction motor are kept inclined. This phenomenon is known as
- skewing
- crawling
- cogging
- none of these