Q.1
A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor
Q.2
The stating torque of the slip ring induction motor can be increased by adding
Q.3
Reduced voltage starter can be used with
Q.4
The speed of a squirrel-cage induction motor can be controlled by all of the following except
Q.5
An induction motor with 1000 r.p.m. speed will have
Q.6
Less maintenance troubles are experienced in case of
Q.7
As load on an induction motor goes on increasing
Q.8
Star-delta starting of motors is not possible in case of
Q.9
In an induction motor the relationship between stator slots and rotor slots is that
Q.10
The frame of an induction motor is usually made of
Q.11
A 3-phase slip ring motor has
Q.12
Low voltage at motor terminals is due to
Q.13
For driving high inertia loads best type of induction motor suggested is
  • Slip ring type
  • Squirrel-cage type
  • Any of the above
  • None of the above
Q.14
5 H.P., 50Hz, 3-phase,V, induction motors are available for the following r.p.m. Which motor will be the costliest?
  • 730 r.p.m.
  • 960 r.p.m.
  • 1440 r.p.m.
  • 2880 r.p.m.
Q.15
Size of a high speed motor as compared to low speed motor for the same H.P. will be
  • Bigger
  • Smaller
  • Same
  • Any of the above
Q.16
Step-less speed control of induction motor is possible by which of the following methods?
  • e.m.f. injection in rotor eueuit
  • Changing the number of poles
  • Cascade operation
  • None of the above
Q.17
When the equivalent circuit diagram of double squirrel-cage induction motor is constructed the two cages can be considered
  • In series
  • In parallel
  • In series-parallel
  • In parallel with stator
0 h : 0 m : 1 s