A Best Way To Crack Gorenment Job Exams

Electrical Engineering Objective Questions { Induction Motors }



29. If an induction motor with certain ratio of rotor to stator slots, runs at of the normal speed, the phenomenon will be termed as
A. humming
B. hunting
C. crawling
D. cogging

30.  Slip of a induction motor is negative when
A. magnetic field and rotor rotate in opposite direction
B. rotor speed is less than the synchronous speed of the field and are in the same direction
C. rotor speed is more than the synchronous speed of the field and are in the same direction
D. none of the above

31. Size of a high speed motor as compared to low speed motor for the same H.P. will be
A. bigger
B. smaller
C. same
D. any of the above

32.  A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor
A. will continue running burning its one phase
B. will continue running burning its two phases
C. will stop and carry heavy current causing permanent damage to its winding
D. will continue running without any harm to the winding

33. A 3-phase induction motor delta connected in carrying too heavy load and one of its fuses blows out. Then the motor
A. will continue running burning its one phase
B. will continue running burning its two phase
C. will stop and carry heavy current causing permanent damage to its windig
D. will continue running without any harm to the winding

34.  Low voltage at motor terminals is due to
A. inadequate motor wiring
B. poorely regulated power supply
C. any one of the above
D. none of the above

35. In an induction motor the relationship between stator slots and rotor slots is that
A. stator slots are equal to rotor slots
B. stator slots are exact multiple of rotor slots
C. stator slots are not exact multiple of rotor slots
D. none of the above

Page 5 of 54

« 3 4  5  67 »

Subjects