Choose the correct answer: 1-In three phase induction motor the no load slip is generally: (A) less than 1% (B) 3% (C) 5% (D) 1 2- If the slip of a 4-pole,three induction motor equal to 4%, the frequency of rotor current will be: (A) 50Hz (B) 25Hz (C) 5Hz (D) 2Hz 3- A double cage, three phase induction motor has: (A) Two series winding in stator (B) Two parallel winding in stator (C)Two parallel winding in r (D) Two rotors moving in opposite directions 4- The autotransformer starter can be used for three phase induction motor of the type: (A) Delta connected only (B) Star connected only (C) Both (A) and (B) 5- If any two phases of three phase induction motor are interchanged: (D) None of abo (A) The motor will run in reverse direction (B) The motor continue to run in the same direction (C) The motor will stop (D) The motor will burn 6- Which of the following motor has high starting torque: (A) Slip ring induction motor (B) Squirrel cage induction motor (C) Both (A)and(B) (D) None of ab 7- The condition for maximum running torque in three phase induction motor is (A) R2= S/X2 (B) R2=X2/2 (C) R2=SX2 8- In induction generator the slip is always: (A) Positive (B)Negative (C) 1 (D) 0 (D) R2=X2 9- If the applied voltage to the stator of three phase induction motor is reduced to half rated value, the the starting torque becomes: (B) 1/4 times the starting torque at rated value (D) 2 times the starting torque at rated value three phase induction motor when it : (A) 4 times the starting torque at rated value (C) 1/2 times the starting torque at rated value 10- The maximum EMF is induced in the rotor of (A) No load (B) Full load (C) Overload (D) Blocked
Choose the correct answer: 1-In three phase induction motor the no load slip is generally: (A) less than 1% (B) 3% (C) 5% (D) 1 2- If the slip of a 4-pole,three induction motor equal to 4%, the frequency of rotor current will be: (A) 50Hz (B) 25Hz (C) 5Hz (D) 2Hz 3- A double cage, three phase induction motor has: (A) Two series winding in stator (B) Two parallel winding in stator (C)Two parallel winding in r (D) Two rotors moving in opposite directions 4- The autotransformer starter can be used for three phase induction motor of the type: (A) Delta connected only (B) Star connected only (C) Both (A) and (B) 5- If any two phases of three phase induction motor are interchanged: (D) None of abo (A) The motor will run in reverse direction (B) The motor continue to run in the same direction (C) The motor will stop (D) The motor will burn 6- Which of the following motor has high starting torque: (A) Slip ring induction motor (B) Squirrel cage induction motor (C) Both (A)and(B) (D) None of ab 7- The condition for maximum running torque in three phase induction motor is (A) R2= S/X2 (B) R2=X2/2 (C) R2=SX2 8- In induction generator the slip is always: (A) Positive (B)Negative (C) 1 (D) 0 (D) R2=X2 9- If the applied voltage to the stator of three phase induction motor is reduced to half rated value, the the starting torque becomes: (B) 1/4 times the starting torque at rated value (D) 2 times the starting torque at rated value three phase induction motor when it : (A) 4 times the starting torque at rated value (C) 1/2 times the starting torque at rated value 10- The maximum EMF is induced in the rotor of (A) No load (B) Full load (C) Overload (D) Blocked
Chapter39: Synchronous Motor Operation
Section: Chapter Questions
Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...
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Transcribed Image Text:Choose the correct answer:
1-In three phase induction motor the no load slip is generally:
(A) less than 1% (B) 3% (C) 5% (D) 1
2- If the slip of a 4-pole,three induction motor equal to 4%, the frequency of rotor current will be:
(A) 50Hz (B) 25Hz (C) 5Hz
(D) 2Hz
3- A double cage, three phase induction motor has:
(A) Two series winding in stator (B) Two parallel winding in stator (C)Two parallel winding in r
(D) Two rotors moving in opposite directions
4- The autotransformer starter can be used for three phase induction motor of the type:
(A) Delta connected only (B) Star connected only (C) Both (A) and (B)
5- If any two phases of three phase induction motor are interchanged:
(D) None of abo
(A) The motor will run in reverse direction (B) The motor continue to run in the same direction
(C) The motor will stop (D) The motor will burn
6- Which of the following motor has high starting torque:
(A) Slip ring induction motor (B) Squirrel cage induction motor (C) Both (A)and(B) (D) None of ab
7- The condition for maximum running torque in three phase induction motor is
(A) R2= S/X2 (B) R2=X2/2
(C) R2=SX2
8- In induction generator the slip is always:
(A) Positive (B)Negative (C) 1 (D) 0
(D) R2=X2
9- If the applied voltage to the stator of three phase induction motor is reduced to half rated value, the
the starting torque becomes:
(B) 1/4 times the starting torque at rated value
(D) 2 times the starting torque at rated value
three phase induction motor when it :
(A) 4 times the starting torque at rated value
(C) 1/2 times the starting torque at rated value
10- The maximum EMF is induced in the rotor of
(A) No load (B) Full load (C) Overload (D) Blocked
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