The circle diagram for an induction motor cannot be used to determine?
A. frequency
B. output
C. power factor
D. efficiency
Polyphase Induction Motors
Reducing the poles of a 3-phase induction motor, it ___.
A. will make no change in power factor
B. will decrease maximum power factor
C. will increase maximum power factor
D. can not be depicted
Which of the following can be done using a synchronous motor but not by induction motor ?
A. Power factor improvement and supply mechanical load
B. Power factor improvement
C. Supplying mechanical load
D. None of the mentioned
Speed control is possible for _____ and not possible for _____.
A. synchronous motor, synchronous-induction motor
B. dc motor, induction motor
C. induction motor, differential motor
D. induction motor, synchronous motor
We can not operate a cage induction motor on a variable frequency load due to ___.
A. fixed slip
B. no availability of varying the speed
C. availability of variable speed
D. low starting torque
Wound rotor induction motor is most appropriate for the applications requiring __.
A. fixed starting torque
B. high starting torque
C. variable starting torque
D. all of the mentioned
The complete circle diagram of induction motor can be drawn with the help of data found from?
A. blocked rotor test
B. stator resistance test
C. no-load test
D. all of the above
Choose from the below which can be obtained by the equivalent circuit of an electrical machine ?
A. Design parameters of the windings
B. Complete performance characteristics of the machine
C. Temperature coefficients of the machine components
D. Type of protection to be used in the machine
For 3-phase induction motor, as load increases from no load towards the full load, torque ____ slip.
A. remains constant to
B. increases hyperbolically to
C. increases in proportion to
D. decreases in proportion to
A constant torque variable power drive of induction machine has ____.
A. variable air gap flux, constant slip
B. constant slip, constant air gap flux
C. constant air gap flux.
D. constant slip