Govt Exams Mock Test FREE | Online Quiz Competition

Q1. If full load copper loss of a transformer is 500W, the copper loss at half load is given by

100 W

125 W

150 W

200 W

Q2. In DC shunt motor by armature voltage and field current speed control methods the speed could be_, and respectively.

Above base speed,Below base speed

Below base speed, Below base speed

Below base speed, Above base speed

Above base speed, Above base speed

Q3. A 2 kVA \(\frac{200}{100}\) V, 400 Hz transformer is desired to be used at a frequency of 50 Hz. What will be the voltage rating of the transformer at reduced frequency if the flux density remains constant?

37 V

25 V

23 V

41 V

Q4. A 40 KVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is__________.

0.5

0.623

0.707

0.577

Q5. During a disturbance on a synchronous machine, the rotor swings from A to B point before finally settling to a study Point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s),

A and B

A and C

B and C

only at C

Q6. Auto transformer supplied a load of 8 kW at 115 V at unity power factor. If primary voltage is 345 V, power transferred to load conductively will be

3.67 kW

2.67 kW

3.78 kW

5.33 kW

Q7. Two transformers connected in open delta supply a 500 kVA balanced load operating at 0.866 power factor lagging. Load voltage is 440 V. kVA supplied by each transformer will be

131.7 kVA

288.7 kVA

181 kVA

251 kVA

Q8. The frequency of rotor current at stand-still is equal to

Zero

2f

f

5f

Q9. For an Ideal two winding transformer, which of the following is INCORRECT?

All the flux is confined to the magnetic core

Core losses are negligible

Winding resistances are negligible

Magnetising curve for the core is non-linear

Q10. A stepper motor has a step angle of \(2.5^\circ\). Calculate the number of steps required for the shaft to Make 25 revolutions.

1800

3600

2700

900

Quiz

Year 2024

October
Week # 2 Quiz 2

Q1. If full load copper loss of a transformer is 500W, the copper loss at half load is given by

Q2. In DC shunt motor by armature voltage and field current speed control methods the speed could be_, and respectively.

Q3. A 2 kVA \(\frac{200}{100}\) V, 400 Hz transformer is desired to be used at a frequency of 50 Hz. What will be the voltage rating of the transformer at reduced frequency if the flux density remains constant?

Q4. A 40 KVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is__________.

Q5. During a disturbance on a synchronous machine, the rotor swings from A to B point before finally settling to a study Point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s),

Q6. Auto transformer supplied a load of 8 kW at 115 V at unity power factor. If primary voltage is 345 V, power transferred to load conductively will be

Q7. Two transformers connected in open delta supply a 500 kVA balanced load operating at 0.866 power factor lagging. Load voltage is 440 V. kVA supplied by each transformer will be

Q8. The frequency of rotor current at stand-still is equal to

Q9. For an Ideal two winding transformer, which of the following is INCORRECT?

Q10. A stepper motor has a step angle of \(2.5^\circ\). Calculate the number of steps required for the shaft to Make 25 revolutions.

Quiz

Year 2024

September Week # 4 Expire on 21 Oct 2024

October Week # 1 Expire on 31 Oct 2024

October Week # 2 Expire on 07 Nov 2024

October Week # 3 Expire on 14 Nov 2024

October Week # 2 Quiz 2

Q1. If full load copper loss of a transformer is 500W, the copper loss at half load is given by

Q2. In DC shunt motor by armature voltage and field current speed control methods the speed could be_____, and ____respectively.

Q3. A 2 kVA \(\frac{200}{100}\) V, 400 Hz transformer is desired to be used at a frequency of 50 Hz. What will be the voltage rating of the transformer at reduced frequency if the flux density remains constant?

Q4. A 40 KVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is__________.

Q5. During a disturbance on a synchronous machine, the rotor swings from A to B point before finally settling to a study Point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s),

Q6. Auto transformer supplied a load of 8 kW at 115 V at unity power factor. If primary voltage is 345 V, power transferred to load conductively will be

Q7. Two transformers connected in open delta supply a 500 kVA balanced load operating at 0.866 power factor lagging. Load voltage is 440 V. kVA supplied by each transformer will be

Q8. The frequency of rotor current at stand-still is equal to

Q9. For an Ideal two winding transformer, which of the following is INCORRECT?

Q10. A stepper motor has a step angle of \(2.5^\circ\). Calculate the number of steps required for the shaft to Make 25 revolutions.

Record & Track Your Performance

October
Week # 2 Quiz 2

Q2. In DC shunt motor by armature voltage and field current speed control methods the speed could be_, and respectively.