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Q1. 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

Q2. The condition for maximum efficiency of a D.C. generator is

Eddy current losses=stray losses.

Eddy current losses=hysteresis losses

Copper losses = 0

Variable losses = constant losses.

Q3. A d.c. series motor takes 30 A at 220 V and runs at 800 r.p.m. If the armature and field resistance are 0.3 \(\Omega\) and 0.2 \(\Omega\) respectively and the iron and friction losses are 0.3 kW, what will be the output of the motor?

6.6 kW

7.35 kW

5.85 kW

7.5 kW

Q4. 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

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. A 460 V series motor runs at 500 rpm taking a current of 40 A. Calculate the percentage change in torque if the load is changed so that the motor takes 30 A.

31.25%

56.25%

43.75%

68.75%

Q7. An alternator is supplying a load of 500 kW at a p.f of 0.5 lagging. If the power factor is raised to unity, how many more kW can alternator supply for the same kVA loading?

500 kW

1000 kW

250 kW

750 kW

Q8. Neglecting saturation, if current drawn by a D.C. Series motor is increased from 10 A to 12 A, the percentage increase in torque will be

20

44

12

2

Q9. A DC generator supplies a load of 7.5 kW at 200 V. The armature resistance is 0.6 ohm and field resistance is 80 ohms. The generated emf is

176

224

204

448

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 2025

January
Week # 2 Quiz 1

Q1. 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

Q2. The condition for maximum efficiency of a D.C. generator is

Q3. A d.c. series motor takes 30 A at 220 V and runs at 800 r.p.m. If the armature and field resistance are 0.3 \(\Omega\) and 0.2 \(\Omega\) respectively and the iron and friction losses are 0.3 kW, what will be the output of the motor?

Q4. 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.

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. A 460 V series motor runs at 500 rpm taking a current of 40 A. Calculate the percentage change in torque if the load is changed so that the motor takes 30 A.

Q7. An alternator is supplying a load of 500 kW at a p.f of 0.5 lagging. If the power factor is raised to unity, how many more kW can alternator supply for the same kVA loading?

Q8. Neglecting saturation, if current drawn by a D.C. Series motor is increased from 10 A to 12 A, the percentage increase in torque will be

Q9. A DC generator supplies a load of 7.5 kW at 200 V. The armature resistance is 0.6 ohm and field resistance is 80 ohms. The generated emf 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 2025

December Week # 3 Expire on 14 Jan 2025

December Week # 4 Expire on 21 Jan 2025

January Week # 1 Expire on 31 Jan 2025

January Week # 2 Expire on 07 Feb 2025

January Week # 2 Quiz 1

Q1. 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

Q2. The condition for maximum efficiency of a D.C. generator is

Q3. A d.c. series motor takes 30 A at 220 V and runs at 800 r.p.m. If the armature and field resistance are 0.3 \(\Omega\) and 0.2 \(\Omega\) respectively and the iron and friction losses are 0.3 kW, what will be the output of the motor?

Q4. 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.

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. A 460 V series motor runs at 500 rpm taking a current of 40 A. Calculate the percentage change in torque if the load is changed so that the motor takes 30 A.

Q7. An alternator is supplying a load of 500 kW at a p.f of 0.5 lagging. If the power factor is raised to unity, how many more kW can alternator supply for the same kVA loading?

Q8. Neglecting saturation, if current drawn by a D.C. Series motor is increased from 10 A to 12 A, the percentage increase in torque will be

Q9. A DC generator supplies a load of 7.5 kW at 200 V. The armature resistance is 0.6 ohm and field resistance is 80 ohms. The generated emf 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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January
Week # 2 Quiz 1