Electrical Machines Losses Efficiency 2 Online Exam Quiz
Electrical Machines Losses Efficiency 2 GK Quiz. Question and Answers related to Electrical Machines Losses Efficiency 2. MCQ (Multiple Choice Questions with answers about Electrical Machines Losses Efficiency 2
The rotor power input of 3-phase induction motor is 15 kW at a slip of 5%. The mechanical power developed at the shaft is?
Options
A : 14.25 kW
B : 7.5 kW
C : 4 kW
D : 700 W
A 3-phase, 6-pole, 50 Hz induction motor has a full load speed of 960 rpm with its slip rings short-circuited. The motor drives the constant load. If the speed is reduced to 400 rpm, then ohmic losses will be?
Options
A : 15
B : 1/15
C : 5
D : 1/5
A 3-phase, 6-pole, 50 Hz induction motor has a full load speed of 960 rpm with its slip rings short circuited. The motor drives the constant load. If the speed is reduced to 800 rpm, then ohmic losses will be?
Options
A : 5 times that at full load
B : 0.2 times as that at full load
C : 15 times as that at full load
D : same as that at full load
For achieving high starting torque and high operating efficiency an induction motor should have _______ rotor circuit resistance and _______ circuit resistance under operating condition.
Options
A : high, low
B : low, high
C : low, low
D : high, high
Insertion of external resistance in the squirrel cage induction motor _________
Options
A : increases torque
B : decreases torque
C : increases torque for some seconds and then decreases
D : does not affect
In a 3-phase slip ring induction motor high starting torque is achieved by _________
Options
A : increasing supply voltage
B : increasing supply frequency
C : connecting a capacitor across the motor terminals
D : connecting a star connected resistance across slip ring terminals of motor
If the rotor circuit resistance is increased in an induction motor, maximum torque will occur at _________
Options
A : lower speed
B : higher speed
C : same speed
D : none of the mentioned
Rotor ohmic loss is ________ slip.
Options
A : proportional to
B : inverse of
C : inversely proportional to
D : hyperbolic to
In a three-phase induction motor, the starting torque is maximum when?
Options
A : r2 = x2
B : r2 = 1/x2
C : r2 = (x2)2
D : r2 = 1 pu
A 3-phasle, 6-pole, 50 Hz induction motor has a full load speed of 960 rpm with its slip rings short circuited. The motor drives the constant load. If the speed is reduced to 800 rpm, then ohmic losses will _________
Options
A : reduce
B : increase
C : reduce first then becomes constant
D : remains same
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