Govt Exams Mock Test FREE | Online Quiz Competition

Q1. A DC shunt generator having \(R_{sh}\: =\:50\Omega\) was generating normally at 1000 rpm. The critical resistance of machine was \(80\Omega\). Due to some reason the speed of the prime mover become such that generator fails to generate. The speed at that time must have been

1600 rpm

625 rpm

800 rpm

500 rpm

Q2. A three-phase 400 V, 6-pole, 50 Hz squirrel-cage induction motor is running at a slip of 5%. The speed of rotor with respect to stator magnetic field and speed of the stator magnetic field with respect to rotor magnetic field are

950 rpm, 1000 rpm

950 rpm, zero

-50 rpm, 1000 rpm

-50 rpm, zero

Q3. 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

Q4. The mechanical power developed by a d.c. motor is maximum when the back e.m.f is

Equal to half of the applied voltage

Equal to the applied voltage

Equal to one third of the applied voltage

Equal to one fourth of the applied voltage

Q5. 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

Q6. 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

Q7. Consider the following statements: A three phase induction motor is connected to the grid. If P is active power and Q is reactive power, the signs of P and Q are respectively 1. positive and positive while operating as motor 2. positive and negative while operating as motor 3. negative and positive while operating as generator 4. positive and positive while operating as generator

1,4 are corrrect

2,4 are correct

2,3 are correct

1,3 are correct

Q8. A single phase transformer when supplied from a 220V, 50Hz supply has eddy current loss of 50 W. If the transformer is connected to a voltage of 330 V, 50 Hz, the Eddy current loss will be

168. 75 w

112. 5 w

75 w

50 W

Q9. The ratio of rotor input, rotor copper loss and rotor output is

\(1: 1-S: S\)

\(1: S: 1-S\)

\(1-S: S: 1\)

\(S: 1-S: 1\)

Q10. Corresponding to certain load connected to a 6-pole, 50Hz wound rotor induction motor, frequency of currents in rotor circuit is observed as 90 cycles per minute. Estimate the rotor speed in rpm.

1030

970

-1030

-970

Quiz

Year 2024

February
Week # 2 Quiz 1

Q1. A DC shunt generator having \(R_{sh}\: =\:50\Omega\) was generating normally at 1000 rpm. The critical resistance of machine was \(80\Omega\). Due to some reason the speed of the prime mover become such that generator fails to generate. The speed at that time must have been

Q2. A three-phase 400 V, 6-pole, 50 Hz squirrel-cage induction motor is running at a slip of 5%. The speed of rotor with respect to stator magnetic field and speed of the stator magnetic field with respect to rotor magnetic field are

Q3. 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

Q4. The mechanical power developed by a d.c. motor is maximum when the back e.m.f is

Q5. 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?

Q6. 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. A single phase transformer when supplied from a 220V, 50Hz supply has eddy current loss of 50 W. If the transformer is connected to a voltage of 330 V, 50 Hz, the Eddy current loss will be

Q9. The ratio of rotor input, rotor copper loss and rotor output is

Q10. Corresponding to certain load connected to a 6-pole, 50Hz wound rotor induction motor, frequency of currents in rotor circuit is observed as 90 cycles per minute. Estimate the rotor speed in rpm.

Quiz

Year 2024

July Week # 1 Expire on 31 Jul 2024

July Week # 2 Expire on 07 Aug 2024

July Week # 3 Expire on 14 Aug 2024

July Week # 4 Expire on 21 Aug 2024

February Week # 2 Quiz 1

Q1. A DC shunt generator having \(R_{sh}\: =\:50\Omega\) was generating normally at 1000 rpm. The critical resistance of machine was \(80\Omega\). Due to some reason the speed of the prime mover become such that generator fails to generate. The speed at that time must have been

Q2. A three-phase 400 V, 6-pole, 50 Hz squirrel-cage induction motor is running at a slip of 5%. The speed of rotor with respect to stator magnetic field and speed of the stator magnetic field with respect to rotor magnetic field are

Q3. 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

Q4. The mechanical power developed by a d.c. motor is maximum when the back e.m.f is

Q5. 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?

Q6. 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. A single phase transformer when supplied from a 220V, 50Hz supply has eddy current loss of 50 W. If the transformer is connected to a voltage of 330 V, 50 Hz, the Eddy current loss will be

Q9. The ratio of rotor input, rotor copper loss and rotor output is

Q10. Corresponding to certain load connected to a 6-pole, 50Hz wound rotor induction motor, frequency of currents in rotor circuit is observed as 90 cycles per minute. Estimate the rotor speed in rpm.

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February
Week # 2 Quiz 1