# At a hydroelectric power plant, the water pressure head is at a height of $$300$$ m and the water flow available is $$100$$ m3 s-1. If the turbine generator efficiency is $$60$$%, the electric power available from the plant is: (Take $$g=9.8$$ m s-2) 1. $$111.3$$ MW 2. $$210$$ MW 3. $$176.4$$ MW 4. $$213.5$$ MW

Subtopic:  AC Generator |
68%
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A power transmission line feeds input power at $$2300$$ V to a step-down transformer with its primary windings having $$4000$$ turns. What should be the number of turns in the secondary in order to get output power at $$230$$ V?
1. $$200$$
2. $$250$$
3. $$350$$
4. $$400$$

Subtopic:  Transformer |
78%
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What is the Q-factor of a series LCR circuit with = 3.0 H, = 27µF, and = 7.4 Ω?

1. 45
2. 55
3. 37
4. 49

Subtopic:  Different Types of AC Circuits |
67%
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A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wirelines carrying power is 0.5 $\Omega$ per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town. The transformer rating is:

1. 440−7000 V
2. 4000−20 V
3. 500−6500 V
4. 220−1100 V

Subtopic:  Transformer |
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A small town with a demand of $$800$$ kW of electric power at $$220$$ V is situated $$15$$ km away from an electric plant generating power at $$440$$ V. The resistance of the two wirelines carrying power is $$0.5 ~\Omega$$ per km. The town gets power from the line through a $$4000 \text { - }220$$ V step-down transformer at a sub-station in the town. The line power loss in the form of heat is:
1. $$100$$ kW
2. $$500$$ kW
3. $$400$$ kW
4. $$600$$ kW

Subtopic:  RMS & Average Values |
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A series LCR circuit with = 0.12 H, = 480 nF, = 23 $\Omega$ is connected to a 230 V variable frequency supply. What is the Q-factor of the given circuit?

1. 11.11
2. 13.31
3. 21.74
4. 22.21

Subtopic:  Different Types of AC Circuits |
71%
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A series LCR circuit with = 0.12 H, = 480 nF, = 23 $\Omega$ is connected to a 230 V variable frequency supply. What is the source frequency for which current amplitude is maximum?

1. 444.4 Hz
2. 663.48 Hz
3. 545.0 Hz
4. 343.41 Hz

Subtopic:  Different Types of AC Circuits |
68%
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A circuit containing an 80 mH inductor and a 60 µF capacitor in series is connected to a 230 V, 50 Hz supply. The resistance of the circuit is negligible. What is the average power transferred to the inductor?

1. 18 J/s
2. 0
3. 12 J/s
4. 19 J/s

Subtopic:  Different Types of AC Circuits |
77%
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A circuit containing an $$80$$ mH inductor and a $$60$$ µF capacitor in series is connected to a $$230$$ V, $$50$$ Hz supply. The resistance of the circuit is negligible. the current amplitude is:
1. $$11.63$$ A
2. $$8.22$$ A
3. $$10.0$$ A
4. $$9.21$$ A

Subtopic:  Different Types of AC Circuits |
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A 100 µF capacitor in series with a 40 $\Omega$ resistance is connected to a 110 V, 60 Hz supply. What is the maximum current in the circuit?

1. 2.19 A
2. 2.29 A
3. 3.14 A
4. 3.24 A

Subtopic:  Different Types of AC Circuits |
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