Quiz

Q1. A 3-phase 6-pole 50 Hz induction motor is running at 5% slip, what will be the speed of motor?

Q2. The inrush current in a transformer at no load is maximum if the supply voltage is switched on

Q3. When the supply voltage to an induction motor is reduced by 10%, the maximum torque will decrease by approximately

Q4. Statement 1: The reactive power drawn by an induction motor will be same irrespective of load torque. Statement 2: The active power drawn by an induction motor will be same irrespective of load torque. Statement 3: The reactive power drawn by an induction motor varies with the variation of load torque. Statement 4: The active power drawn by an induction motor varies with the variation of load torque. Which of these statements are true?

Q5. A single phase transformer when supplied from a 220V, 50Hz supply has eddy current loss of 50 W. If the transformer is connected to a voltage of 330 V, 50 Hz, the Eddy current loss will be

Q6. The motor used where high starting torque is required and where the load is subject to heavy fluctuations is a

Q7. A winding of 4 pole alternator having 36 slots & a coil span of 1 to 8 is short pitched by

Q8. A 25KW,125V separately excited machine is running at constant speed of 3000 RPM with open circuit terminal voltage of 125V (consider field current as constant).The armature resistance and terminal voltage are 0.02 ohm and 128V respectively. Hence the armature current and terminal power will be

Q9. A 10 kVA, 400V/200 V single phase transformer with a resistance of 3 % and reactance of 6 % is supplying a current of 50 A to a resistive load, voltage across load is

Q10. A 4-pole, \(500\: V\) DC shunt motor has 720 wave connected conductor on its armature. The full load armature current is \(60\: A\) and the flux per pole is \(0.03\: Wb\), the armature resistance including brush contact is \(0.2\: \Omega\). Calculate the full load speed of the motor.