Govt Exams Mock Test FREE | Online Quiz Competition

Q1. Transformer offers negative voltage regulation when its operating power factor is

zero

leading

lagging

unity

Q2. The transformer has a turns ratio of 4:1. The resistance of the HV winding is 8 ohms and that of the LV winding is 1 ohm. The total resistance on HV side in ohms is

9

8.25

24

9.5

Q3. A 5 kVA transformer has iron losses and full load copper losses are 250 W, 350W respectively. The tranformer will deliver maximum efficiency when the total loss is

250W

600W

350W

500W

Q4. Which of the following transformer is smallest?

2 kVA, 500 Hz

2 kVA, 200 Hz

2 kVA, 400 Hz

2 kVA, 50 Hz

Q5. A transformer has maximum efficiency at 3/4 full load. The ratio of Iron loss and full load copper loss is

16/9

4/3

3/4

9/16

Q6. The best method for speed control of 3-phase induction motor is

Pole changing method

Frequency control method

Slip control method

Cascade connection

Q7. A 3\(\phi\)- 4 pole induction motor is supplied from 3-\(\phi\) 50 Hz AC supply. Find the rotor frequency when it runs at 600 RPM.

25 Hz

30 Hz

20 Hz

35 Hz

Q8. A T-T transformer can not be parallel with transformer

V-V

star-delta

star-star

delta-delta

Q9. An eight-pole wave-connected armature has 600 conductors and is driven at 625 rev/min. If the flux per pole is 20 mWb, determine the generated emf.

250 V

325 V

500 V

125 V

Q10. Which of the following is NOT true for the maximum torque in the three-phase induction motor?

When the slip is half of the ratio of rotor resistance to that of rotor reactance, the torque will be maximum.

By varying the rotor resistance, a maximum torque can be obtained at any required slip.

The maximum torque is directly proportional to square of rotor induced EMF at the standstill.

The maximum torque is inversely proportional to the rotor reactance.

Quiz

Year 2024

June
Week # 2 Quiz 2

Q1. Transformer offers negative voltage regulation when its operating power factor is

Q2. The transformer has a turns ratio of 4:1. The resistance of the HV winding is 8 ohms and that of the LV winding is 1 ohm. The total resistance on HV side in ohms is

Q3. A 5 kVA transformer has iron losses and full load copper losses are 250 W, 350W respectively. The tranformer will deliver maximum efficiency when the total loss is

Q4. Which of the following transformer is smallest?

Q5. A transformer has maximum efficiency at 3/4 full load. The ratio of Iron loss and full load copper loss is

Q6. The best method for speed control of 3-phase induction motor is

Q7. A 3\(\phi\)- 4 pole induction motor is supplied from 3-\(\phi\) 50 Hz AC supply. Find the rotor frequency when it runs at 600 RPM.

Q8. A T-T transformer can not be parallel with transformer

Q9. An eight-pole wave-connected armature has 600 conductors and is driven at 625 rev/min. If the flux per pole is 20 mWb, determine the generated emf.

Q10. Which of the following is NOT true for the maximum torque in the three-phase induction motor?

Quiz

Year 2024

July Week # 1 Expire on 31 Jul 2024

July Week # 2 Expire on 07 Aug 2024

July Week # 3 Expire on 14 Aug 2024

July Week # 4 Expire on 21 Aug 2024

June Week # 2 Quiz 2

Q1. Transformer offers negative voltage regulation when its operating power factor is

Q2. The transformer has a turns ratio of 4:1. The resistance of the HV winding is 8 ohms and that of the LV winding is 1 ohm. The total resistance on HV side in ohms is

Q3. A 5 kVA transformer has iron losses and full load copper losses are 250 W, 350W respectively. The tranformer will deliver maximum efficiency when the total loss is

Q4. Which of the following transformer is smallest?

Q5. A transformer has maximum efficiency at 3/4 full load. The ratio of Iron loss and full load copper loss is

Q6. The best method for speed control of 3-phase induction motor is

Q7. A 3\(\phi\)- 4 pole induction motor is supplied from 3-\(\phi\) 50 Hz AC supply. Find the rotor frequency when it runs at 600 RPM.

Q8. A T-T transformer can not be parallel with transformer

Q9. An eight-pole wave-connected armature has 600 conductors and is driven at 625 rev/min. If the flux per pole is 20 mWb, determine the generated emf.

Q10. Which of the following is NOT true for the maximum torque in the three-phase induction motor?

Record & Track Your Performance

June
Week # 2 Quiz 2