Question 1 : What value of direct current must flow through a resistor to produce the same heating power as an alternating current with a peak value of 3.5 A?
1. 1.5 A
2. 2.5 A
3. 3.5 A
4. 4.5 A
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Question 2 : In an AC circuit, resistance 50 O, inductance 0.3 H and capacitance 15 µF is connected to an AC voltage source 25 V, 50 Hz. Determine the phase difference between current and voltage.
1. 670
2. 540
3. 470
4. 770
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Question 3 : In an AC circuit, resistance 50 O, inductance 0.3 H and capacitance 15 µF is connected to an AC voltage source 25 V, 50 Hz. Determine the current in the circuit.
1. 0.01 A
2. 0.2 A
3. 0.02 A
4. 0.002 A
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Question 4 : In an AC circuit, resistance 50 O, inductance 0.3 H and capacitance 15 µF is connected to an AC voltage source 25 V, 50 Hz. Determine the impedance in the circuit.
1. 110 ohm
2. 100 ohm
3. 125 ohm
4. 140 ohm
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Question 5 : In an AC circuit, resistance 50 O, inductance 0.3 H and capacitance 15 µF is connected to an AC voltage source 25 V, 50 Hz. Determine the capacitive reactance in the circuit.
1. 316 ohm
2. 195 ohm
3. 124 ohm
4. 212 ohm
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Question 6 : In an AC circuit, resistance 50 O, inductance 0.3 H and capacitance 15 µF is connected to an AC voltage source 25 V, 50 Hz. Determine the inductive reactance in the circuit.
1. 36 ohm
2. 95 ohm
3. 125 ohm
4. 140 ohm
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Question 7 : Name some devices where maximum power has to be transferred to the load rather than maximum efficiency.
1. Amplifiers
2. Communication circuits
3. Both amplifiers and communication circuits
4. Neither amplifiers nor communication circuits
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Question 8 : Under the condition of maximum power efficiency is?
1. 100%
2. 0%
3. 30%
4. 50%
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Question 9 : Does maximum power transfer imply maximum efficiency?
1. Yes
2. No
3. Sometimes
4. Cannot be determined
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Question 10 : If ZL=Zs', then RL=?
1. -RL
2. Rs
3. -Rs
4. 0
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