Govt Exams Mock Test FREE | Online Quiz Competition

Q1. The ratio of rotor input, rotor copper loss and rotor output is

\(1: 1-S: S\)

\(1: S: 1-S\)

\(1-S: S: 1\)

\(S: 1-S: 1\)

Q2. A 10-pole induction motor is supplied by a 6-pole alternator, which is driven at 1400 rpm. If the motor runs with a slip of 5%, what is its speed?

1575 rpm

882 rpm

1425 rpm

798 rpm

Q3. A 220 V d.c. machine has an armature resistance of 1 ohm. If the full load current is 20A, then the difference in the induced voltage when the machine is running as a motor and as a generator is

20 V

0 V

40 V

50 V

Q4. In a single phase induction motor, the relationship between the slip of the rotor with respect to the forward rotating field \(S_f\) and backward rotating field \(S_b\) is

\(S_f +S_b =4\)

\(S_f +S_b =2\)

\(S_f +S_b =1\)

\(S_f +S_b =0\)

Q5. Two transformers A and B equal outputs and voltage ratio but unequal percentage impedance of 2 and 4 are operating in parallel. The transformer A will be overloaded by___________percent.

50%

33%

66%

25%

Q6. Eddy current power loss in a DC generator is

directly proportional to square of the thickness of the lamination

inversely proportional to the thickness of the lamination

directly proportional to the thickness of the lamination

inversely proportional to square of the thickness of the lamination

Q7. A d.c series motor develops a torque of 30 N-m at 3 A load current. If the current is increased to 6 A, the torque developed will be

30 N-m

120 N-m

60 N-m

90 N-m

Q8. The primary and secondary windings of a single-phase 1000 kVA, 2000/1000 V transformer have leakage reactances each of \(2\:\Omega\). Find the per unit reactance of the transformer.

0.5 pᴜ

1.5 pᴜ

0.25 pᴜ

2.5 pᴜ

Q9. A 4 pole, 50 Hz induction motor has a rotor resistance of 0.3 Ohm and standstill reactance of 1.2 Ohm. What is the value of the speed at maximum torque?

1100 rpm

1025 rpm

1125 rpm

112 rpm

Q10. An 8 pole, 250 V, wave-wound generator has 400 conductors. If the generator is to be lap-wound, the number of conductors required is

800

3200

1600

400

Quiz

Year 2024

October
Week # 2 Quiz 1

Q1. The ratio of rotor input, rotor copper loss and rotor output is

Q2. A 10-pole induction motor is supplied by a 6-pole alternator, which is driven at 1400 rpm. If the motor runs with a slip of 5%, what is its speed?

Q3. A 220 V d.c. machine has an armature resistance of 1 ohm. If the full load current is 20A, then the difference in the induced voltage when the machine is running as a motor and as a generator is

Q4. In a single phase induction motor, the relationship between the slip of the rotor with respect to the forward rotating field \(S_f\) and backward rotating field \(S_b\) is

Q5. Two transformers A and B equal outputs and voltage ratio but unequal percentage impedance of 2 and 4 are operating in parallel. The transformer A will be overloaded by___________percent.

Q6. Eddy current power loss in a DC generator is

Q7. A d.c series motor develops a torque of 30 N-m at 3 A load current. If the current is increased to 6 A, the torque developed will be

Q8. The primary and secondary windings of a single-phase 1000 kVA, 2000/1000 V transformer have leakage reactances each of \(2\:\Omega\). Find the per unit reactance of the transformer.

Q9. A 4 pole, 50 Hz induction motor has a rotor resistance of 0.3 Ohm and standstill reactance of 1.2 Ohm. What is the value of the speed at maximum torque?

Q10. An 8 pole, 250 V, wave-wound generator has 400 conductors. If the generator is to be lap-wound, the number of conductors required is

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 1

Q1. The ratio of rotor input, rotor copper loss and rotor output is

Q2. A 10-pole induction motor is supplied by a 6-pole alternator, which is driven at 1400 rpm. If the motor runs with a slip of 5%, what is its speed?

Q3. A 220 V d.c. machine has an armature resistance of 1 ohm. If the full load current is 20A, then the difference in the induced voltage when the machine is running as a motor and as a generator is

Q4. In a single phase induction motor, the relationship between the slip of the rotor with respect to the forward rotating field \(S_f\) and backward rotating field \(S_b\) is

Q5. Two transformers A and B equal outputs and voltage ratio but unequal percentage impedance of 2 and 4 are operating in parallel. The transformer A will be overloaded by___________percent.

Q6. Eddy current power loss in a DC generator is

Q7. A d.c series motor develops a torque of 30 N-m at 3 A load current. If the current is increased to 6 A, the torque developed will be

Q8. The primary and secondary windings of a single-phase 1000 kVA, 2000/1000 V transformer have leakage reactances each of \(2\:\Omega\). Find the per unit reactance of the transformer.

Q9. A 4 pole, 50 Hz induction motor has a rotor resistance of 0.3 Ohm and standstill reactance of 1.2 Ohm. What is the value of the speed at maximum torque?

Q10. An 8 pole, 250 V, wave-wound generator has 400 conductors. If the generator is to be lap-wound, the number of conductors required is

Record & Track Your Performance

October
Week # 2 Quiz 1