Govt Exams Mock Test FREE | Online Quiz Competition

Q1. In a d.c. generator, the main function of the compensating winding is to

Assist in commutation

Eliminate reactance voltage

Reduce the demagnetizing effect of armature reaction

Reduce the distorting effect of armature reaction

Q2. When two alternators are running in exactly synchronism, the synchronising power will be

sum of the output of two

unity

zero

0.707.

Q3. Two synchronous generators G1and G2 are equally sharing the KVAR of the load while operating in parallel. Keeping the terminal voltage fixed in order to shift part of the KVAR load from G2 to G1

The field current of G1 is lowered

The field current of G2 is raised

The field current of G1 is raised and of G2 lowered

The field current of G1 is lowered and of G2 is raised

Q4. 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

Q5. A 3000/300 V transformer takes 0.8 A at power factor of 0.4 on open circuit. Magnetizing current of the transformer will be

0.73 A

0.53 A

0.33 A

0.83 A

Q6. In induction motor \(N_s \) is the synchronous speed and S slip, then actual running speed of an induction motor will be

\(N_s \)

\( SN_s \)

\( (1-S)N_s \)

\((N_s-1)S \)

Q7. For a DC machine armature having 10 poles with 10 rps, the number of hysteresis loops formed per second is

100

10

1

50

Q8. A balanced star connected and purely resistive load (4 Ω in all three phases) is connected at the secondary of a star-delta transformer. The line to line voltage rating of the transformer is 110V/220V. Neglecting the non-idealities of the transformer, the impedance ‘Z’ of the equivalent star connected load, referred to the primary side of the transformer is

3+j0 Ω

0.866-j.5 Ω

0.866+j0.5 Ω

1+j0 Ω

Q9. Which of the following statements does NOT come under the advantages of stationary armature in an alternator?

The stator weight is less compared to rotor weight.

Sparking at brushes is completely avoided.

It needs only two slip rings on DC side.

It is easy to insulate sliprings which are on DC.

Q10. On the two sides of a star-delta transformer

Voltages and currents are in phase

Voltages and currents differ in phase by 30°

Voltages differ in phase by 30°, but currents are in phase

Currents differ in phase by 30°, but voltages are in phase

Quiz

Year 2024

August
Week # 2 Quiz 2

Q1. In a d.c. generator, the main function of the compensating winding is to

Q2. When two alternators are running in exactly synchronism, the synchronising power will be

Q3. Two synchronous generators G1and G2 are equally sharing the KVAR of the load while operating in parallel. Keeping the terminal voltage fixed in order to shift part of the KVAR load from G2 to G1

Q4. For an Ideal two winding transformer, which of the following is INCORRECT?

Q5. A 3000/300 V transformer takes 0.8 A at power factor of 0.4 on open circuit. Magnetizing current of the transformer will be

Q6. In induction motor \(N_s \) is the synchronous speed and S slip, then actual running speed of an induction motor will be

Q7. For a DC machine armature having 10 poles with 10 rps, the number of hysteresis loops formed per second is

Q9. Which of the following statements does NOT come under the advantages of stationary armature in an alternator?

Q10. On the two sides of a star-delta transformer

Quiz

Year 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

September Week # 3 Expire on 14 Oct 2024

August Week # 2 Quiz 2

Q1. In a d.c. generator, the main function of the compensating winding is to

Q2. When two alternators are running in exactly synchronism, the synchronising power will be

Q3. Two synchronous generators G1and G2 are equally sharing the KVAR of the load while operating in parallel. Keeping the terminal voltage fixed in order to shift part of the KVAR load from G2 to G1

Q4. For an Ideal two winding transformer, which of the following is INCORRECT?

Q5. A 3000/300 V transformer takes 0.8 A at power factor of 0.4 on open circuit. Magnetizing current of the transformer will be

Q6. In induction motor \(N_s \) is the synchronous speed and S slip, then actual running speed of an induction motor will be

Q7. For a DC machine armature having 10 poles with 10 rps, the number of hysteresis loops formed per second is

Q9. Which of the following statements does NOT come under the advantages of stationary armature in an alternator?

Q10. On the two sides of a star-delta transformer

Record & Track Your Performance

August
Week # 2 Quiz 2