Electrical Machines Operating Characteristics Induction Motors Online Exam Quiz
Electrical Machines Operating Characteristics Induction Motors GK Quiz. Question and Answers related to Electrical Machines Operating Characteristics Induction Motors. MCQ (Multiple Choice Questions with answers about Electrical Machines Operating Characteristics Induction Motors
A 10 kW, 400 V, 3-phase, 4-pole, 50 Hz induction motor develops the rated output at rated voltage with its slip rings shorted. The maximum torque is twice the full load torque occurs at the slip of 10% with zero external resistance in the rotor circuit. An external resistance is now tripled in the rotor circuit. Then the slip at which maximum torque occur for the same load torque is?
Options
A : 0.3
B : 0.268
C : 0.03
D : 3
A 3-phase, 50 Hz, 6-pole induction motor has a shaft output of 10kW at 930 rpm. Friction and windage losses is 1% of the output. Total stator losses is 600W. What is the rotor input?
Options
A : 10860 W
B : 10100 W
C : 11460 W
D : 11000 W
A 3-phase, 50 Hz, 6-pole induction motor has a shaft output of 10kW at 930 rpm. Friction and windage losses is 1% of the output. Total stator losses is 600W. What is the stator input?
Options
A : 10860 W
B : 10100 W
C : 11460 W
D : 11000 W
A 10 kW, 400 V, 3-phase, 4-pole, 50 Hz induction motor develops the rated output at rated voltage with its slip rings shorted. The maximum torque is twice the full load torque occurs at the slip of 10% with zero external resistance in the rotor circuit. The speed at the full load torque will be?
Options
A : 1460 rpm
B : 1400 rpm
C : 1360 rpm
D : 1470 rpm
A 10 kW, 400 V, 3-phase, 4-pole, 50 Hz induction motor develops the rated output at rated voltage with its slip rings shorted. The maximum torque equal to twice the full load torque occurs at the slip of 10% with zero external resistance in the rotor circuit. The slip at the full load torque will be?
Options
A : 2.7%
B : 5%
C : 3.7%
D : 10%
For a three phase induction motor, maximum torque is double the full load torque and starting torque is 1.6 times the full load torque. To get a full load slip of 5%, percentage reduction in the rotor resistance should be?
Options
A : 62.7%
B : 75%
C : 60%
D : 35%
Mark the stable operating point when the load torque shifts from Tl1 to Tl2.
Options
A : A
B : A,B
C : B,C
D : A,C
The stable point in the operation of the induction motor is?
Options
A : C
B : D
C : B
D : A
The stable point to use the induction motor possesing the below characteristic.
Options
A : C
B : D
C : C and D
D : Machine will not start
A 10 kW, 400 V, 3-phase, 4-pole, 50 Hz induction motor develops the rated output at rated voltage with its slip rings shorted. The maximum torque is twice the full load torque occurs at the slip of 10% with zero external resistance in the rotor circuit. An external resistance is now tripled in the rotor circuit. Then the stator current will _________
Options
A : remain constant
B : increase
C : decrease
D : any of the mentioned
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