Govt Exams Mock Test FREE | Online Quiz Competition

Q1. The core of a three phase, 50 Hz, 11000 / 500 V delta/star, 500 kVA, core-type transformer operates with a flux of 0.05 Wb. Find the number of HV and LV turns per phase.

572 turns and 26 turns

991 turns and 45 turns

991 turns and 26 turns

572 turns and 45 turns

Q2. The pitch of Arc with 96 stator slots and 6 pole is

36

16

48

32

Q3. For a DC machine armature having 10 poles with 10 rps, the number of hysteresis loops formed per second is

100

10

1

50

Q4. What is the magnetising component (\(I_m\)) of no load current (\(I_0\)) wherein primary voltage is \(V_1\)?

\(I_m=I_0\sin\phi\) lagging \(V_1\) by \(90^\circ\)

\(I_m=I_0\sin\phi\) leading \(V_1\) by \(90^\circ\)

\(I_m=I_0\cos\phi\) leading \(V_1\) by \(90^\circ\)

\(I_m=I_0\cos\phi\) lagging \(V_1\) by \(90^\circ\)

Q5. A trasformer at full load has a copper loss of 400 W and an iron loss of 200 W. The copper loss and iron loss at half full load will respectively be

100 W and 200 W

200 W and 200 W

200 W and 100 W

400 W and 400 W

Q6. In d.c. generator, if P is number of poles, N the rpm of rotor, then the frequency of magnetic reversals is

NP/2

NP/60

NP/120

NP/3600

Q7. A 3-phase, 8 pole induction motor has slip of 4% at full load. The full load speed of the motor is _____ r.p.m.

750

730

725

720

Q8. The transformer has 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

Q9. The copper loss of a certain transformer at the half-full load is measured as 400 watts. The copper loss at full load will be

800 watts

200 watts

400 watts

1600 watts

Q10. Determine maximum permissible load which a 15 MVA, ONAN cooled transformer to IS : 2026 can take for 6 hr, if the initial load on it was 12 MVA. The weighted ambient temperature is \(20^\circ\). Assume the permissible load kVA as a fraction of rated kVA is 1.25.

18.75 MVA

9.6 MVA

12 MVA

15 MVA

Quiz

Year 2024

July
Week # 2 Quiz 2

Q1. The core of a three phase, 50 Hz, 11000 / 500 V delta/star, 500 kVA, core-type transformer operates with a flux of 0.05 Wb. Find the number of HV and LV turns per phase.

Q2. The pitch of Arc with 96 stator slots and 6 pole is

Q3. For a DC machine armature having 10 poles with 10 rps, the number of hysteresis loops formed per second is

Q4. What is the magnetising component (\(I_m\)) of no load current (\(I_0\)) wherein primary voltage is \(V_1\)?

Q5. A trasformer at full load has a copper loss of 400 W and an iron loss of 200 W. The copper loss and iron loss at half full load will respectively be

Q6. In d.c. generator, if P is number of poles, N the rpm of rotor, then the frequency of magnetic reversals is

Q7. A 3-phase, 8 pole induction motor has slip of 4% at full load. The full load speed of the motor is _____ r.p.m.

Q8. The transformer has 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

Q9. The copper loss of a certain transformer at the half-full load is measured as 400 watts. The copper loss at full load will be

Q10. Determine maximum permissible load which a 15 MVA, ONAN cooled transformer to IS : 2026 can take for 6 hr, if the initial load on it was 12 MVA. The weighted ambient temperature is \(20^\circ\). Assume the permissible load kVA as a fraction of rated kVA is 1.25.

Quiz

Year 2024

August Week # 3 Expire on 14 Sep 2024

August Week # 4 Expire on 21 Sep 2024

September Week # 1 Expire on 30 Sep 2024

September Week # 2 Expire on 07 Oct 2024

July Week # 2 Quiz 2

Q1. The core of a three phase, 50 Hz, 11000 / 500 V delta/star, 500 kVA, core-type transformer operates with a flux of 0.05 Wb. Find the number of HV and LV turns per phase.

Q2. The pitch of Arc with 96 stator slots and 6 pole is

Q3. For a DC machine armature having 10 poles with 10 rps, the number of hysteresis loops formed per second is

Q4. What is the magnetising component (\(I_m\)) of no load current (\(I_0\)) wherein primary voltage is \(V_1\)?

Q5. A trasformer at full load has a copper loss of 400 W and an iron loss of 200 W. The copper loss and iron loss at half full load will respectively be

Q6. In d.c. generator, if P is number of poles, N the rpm of rotor, then the frequency of magnetic reversals is

Q7. A 3-phase, 8 pole induction motor has slip of 4% at full load. The full load speed of the motor is _____ r.p.m.

Q8. The transformer has 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

Q9. The copper loss of a certain transformer at the half-full load is measured as 400 watts. The copper loss at full load will be

Q10. Determine maximum permissible load which a 15 MVA, ONAN cooled transformer to IS : 2026 can take for 6 hr, if the initial load on it was 12 MVA. The weighted ambient temperature is \(20^\circ\). Assume the permissible load kVA as a fraction of rated kVA is 1.25.

Record & Track Your Performance

July
Week # 2 Quiz 2