Govt Exams Mock Test FREE | Online Quiz Competition

Q1. 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%

Q2. Two DC series motors connected in series draw current I from supply and run at speed N. When the same two motors are connected in parallel taking current I from the supply, the speed of each motor will be

N/2

N

2N

4N

Q3. An alternator is supplying a load of 300 kW at a p.f. of 0.6 lagging. If the p.f. is raised to unity, how many more kW can alternator supply?

200 kW

100 kW

300 kW

150 kW

Q4. For starting of an induction motor, star/delta starting can be considered equivalent to an auto transformer starter with the ratio of_________.

1

0.25

0.577

0.75

Q5. A Cylindrical rotor Synchronous motor , connected to infinite bus , is working with load angel of \(30^\circ\) if the load on motor is doubled , Keping excitation constant ,then the load angel will be

60 degree

30 degree

90 degree

45 degree

Q6. Neglecting saturation, if the current taken by a DC series motor is increased from 10 A to 12 A, the percentage increase in its torque will be:

20

44

33.2

16.6

Q7. A 400V/100V , 20KVA two winding transformer is reconnected as an autotransformer, the maximum rating of that autotransformer is

40KVA

100KVA

20KVA

50KVA

Q8. A single phase ideal transformer is having a voltage rating \(\frac{200V}{100V}\), 50 Hz. The HV and LV sides of the transformer are connected in two different ways with the help of voltmeters as depicted in figure (a) and (b).

If the HV side is energized with 200 V, 50 Hz source in both the cases, the readings of voltmeters \(V1\) and \(V_2\) respectively will be:

100 V and 300 V

300 V and 100 V

100 V or 0 V

0 V or 300 V

Q9. A 30 kW, 300 V DC shunt generator has armature and field resistance of 0.05 Ω and 100 Ω respectively. What is generated emf?

294.85

311.25

305.15

None of the above

Q10. 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

Quiz

Year 2024

September
Week # 2 Quiz 1

Q1. 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.

Q2. Two DC series motors connected in series draw current I from supply and run at speed N. When the same two motors are connected in parallel taking current I from the supply, the speed of each motor will be

Q3. An alternator is supplying a load of 300 kW at a p.f. of 0.6 lagging. If the p.f. is raised to unity, how many more kW can alternator supply?

Q4. For starting of an induction motor, star/delta starting can be considered equivalent to an auto transformer starter with the ratio of_________.

Q5. A Cylindrical rotor Synchronous motor , connected to infinite bus , is working with load angel of \(30^\circ\) if the load on motor is doubled , Keping excitation constant ,then the load angel will be

Q6. Neglecting saturation, if the current taken by a DC series motor is increased from 10 A to 12 A, the percentage increase in its torque will be:

Q7. A 400V/100V , 20KVA two winding transformer is reconnected as an autotransformer, the maximum rating of that autotransformer is

Q9. A 30 kW, 300 V DC shunt generator has armature and field resistance of 0.05 Ω and 100 Ω respectively. What is generated emf?

Q10. 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?

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

September Week # 2 Quiz 1

Q1. 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.

Q2. Two DC series motors connected in series draw current I from supply and run at speed N. When the same two motors are connected in parallel taking current I from the supply, the speed of each motor will be

Q3. An alternator is supplying a load of 300 kW at a p.f. of 0.6 lagging. If the p.f. is raised to unity, how many more kW can alternator supply?

Q4. For starting of an induction motor, star/delta starting can be considered equivalent to an auto transformer starter with the ratio of_________.

Q5. A Cylindrical rotor Synchronous motor , connected to infinite bus , is working with load angel of \(30^\circ\) if the load on motor is doubled , Keping excitation constant ,then the load angel will be

Q6. Neglecting saturation, if the current taken by a DC series motor is increased from 10 A to 12 A, the percentage increase in its torque will be:

Q7. A 400V/100V , 20KVA two winding transformer is reconnected as an autotransformer, the maximum rating of that autotransformer is

Q9. A 30 kW, 300 V DC shunt generator has armature and field resistance of 0.05 Ω and 100 Ω respectively. What is generated emf?

Q10. 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?

Record & Track Your Performance

September
Week # 2 Quiz 1