Hi friends, this post is about the objectives of induction motor check out and comment here...
1) The torque-slip characteristics of an induction motor is approximately a/an
A) straight line
B) rectangular parabola
C) parabola
D) hyperbola
Ans:B
2) If the rotor circuit resistance is increased in an induction motor, the maximum torque will occur at
A) lower speed
B) high speed
C) the same speed
D) none of these
Ans:A
3) Stable operation of an induction motor is
A) between zero slip and unity slip
B) between 0.5 slip and 0.95 slip
C) between zero slip and slip corresponding to maximum torque
D) between slip corresponding to maximum torque and unity slip
Ans:C
4) The losses that occur in an induction motor are
A) stator copper loss
B) stator iron loss
C) rotor copper loss
D) windage and friction losses
E) all the above
Ans:E
5) In a 3-phase induction motor iron loss mainly occurs in
A) stator and rotor
B) rotor core and rotor teeth
C) stator core and stator teeth
D) stator winding
Ans:C
6) An increase in rotor circuit reactance of a 3-phase induction motor will
A) reduce starting torque as well as maximum torque
B) increase starting torque as well as maximum torque
C) increase starting torque and reduce maximum torque
D) increase maximum torque and reduce starting torque
Ans:A
7) The supply voltage to an induction motor is reduced by 10%. By what percentage approximately will the maximum torque decrease?
A) 50%
B) 10%
C) 20%
D) 40%
Ans:C
8) When the applied voltage per phase is reduced to one-half, the starting torque of a three phase squirrel cage induction motor becomes
A) 1/2 of the initial value
B) 1/4 of the initial value
C) twice of initial value
D) 4 times of initial value
Ans:B
9) In a 3-phase induction motor, the starting torque will be maximum when
A) R2 = 1/X2
B) R2 = X2
C) R2= X2^2
D) R2 = √X2
Ans:B
10) Breakdown torque of a 3-phase induction motor of negligible stator impedance is
A) directly proportional to the rotor resistance
B) inversely proportional to the rotor resistance
C) directly proportional to the reactance
D) inversely proportional to the rotor leakage reactance
Ans:D
If you like my post please share it with your friends and comment here if you have any doubts....
1) The torque-slip characteristics of an induction motor is approximately a/an
A) straight line
B) rectangular parabola
C) parabola
D) hyperbola
Ans:B
2) If the rotor circuit resistance is increased in an induction motor, the maximum torque will occur at
A) lower speed
B) high speed
C) the same speed
D) none of these
Ans:A
3) Stable operation of an induction motor is
A) between zero slip and unity slip
B) between 0.5 slip and 0.95 slip
C) between zero slip and slip corresponding to maximum torque
D) between slip corresponding to maximum torque and unity slip
Ans:C
4) The losses that occur in an induction motor are
A) stator copper loss
B) stator iron loss
C) rotor copper loss
D) windage and friction losses
E) all the above
Ans:E
5) In a 3-phase induction motor iron loss mainly occurs in
A) stator and rotor
B) rotor core and rotor teeth
C) stator core and stator teeth
D) stator winding
Ans:C
6) An increase in rotor circuit reactance of a 3-phase induction motor will
A) reduce starting torque as well as maximum torque
B) increase starting torque as well as maximum torque
C) increase starting torque and reduce maximum torque
D) increase maximum torque and reduce starting torque
Ans:A
7) The supply voltage to an induction motor is reduced by 10%. By what percentage approximately will the maximum torque decrease?
A) 50%
B) 10%
C) 20%
D) 40%
Ans:C
8) When the applied voltage per phase is reduced to one-half, the starting torque of a three phase squirrel cage induction motor becomes
A) 1/2 of the initial value
B) 1/4 of the initial value
C) twice of initial value
D) 4 times of initial value
Ans:B
9) In a 3-phase induction motor, the starting torque will be maximum when
A) R2 = 1/X2
B) R2 = X2
C) R2= X2^2
D) R2 = √X2
Ans:B
10) Breakdown torque of a 3-phase induction motor of negligible stator impedance is
A) directly proportional to the rotor resistance
B) inversely proportional to the rotor resistance
C) directly proportional to the reactance
D) inversely proportional to the rotor leakage reactance
Ans:D
If you like my post please share it with your friends and comment here if you have any doubts....
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