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ECE, EEE, CSE

Power Electronics

1. A cycloconverter can be A. step down B. step up C. step down or step up D. none of the above Answer: Option C Explanation: The output frequency can be more or less than input frequency. 2. In the below figure the average load current is 15 A. The …

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Time Response of Reactive Circuits – True or False

1. The flat portions of a pulse waveform contain low-frequency components. A. True B. False Answer: Option A 2. In an RL differentiating circuit, the output voltage is taken across the resistor. A. True B. False Answer: Option B 3. In an RC integrating circuit, the output voltage is taken …

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Time Response of Reactive Circuits – General Questions

1. When a 15 V input pulse with a width equal to two time constants is applied to an RC integrator, the capacitor charges to A. 15 V B. 12.9 V C. 8.6 V D. 19.45 V Answer: Option B 2. An integrator consists of a 3.3 k resistor and …

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Passive Filters – True or False

2. In an RL high-pass filter, the output is taken across the inductor and the output leads the input. A. True B. False Answer: Option A 3. In an RC high-pass filter, the output is taken across the resistor and the output leads the input. A. True B. False Answer: …

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Passive Filters – General Questions

1. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency A. is 7 kHz B. is 10 kHz C. is 12 kHz D. cannot be determined Answer: Option C 2. An RL low-pass filter consists of a …

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RL Circuits – True or False

1. Total current in an RL circuit always lags the source voltage. A. True B. False Answer: Option A 2. The resistor voltage in an RL circuit is always out of phase with the current. A. True B. False Answer: Option B 3. A filter passes certain frequencies and rejects …

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RL Circuits – General Questions

1. A 1.5 k resistor and a coil with a 2.2 k inductive reactance are in series across an 18 V ac source. The power factor is A. 564 B. 0.564 C. 6.76 D. 55.7 Answer: Option B 2. The voltages in Problem 5 are measured at a certain frequency. …

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Transformers – General Questions

1. What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV? A. 4 kVA B. 0.25 kVA C. 16 kVA D. 8 kVA Answer: Option C 2. The turns ratio required to match an 80 …

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Capacitors – General Questions

1. A 10 F, 20 F, 22 F, and 100 F capacitor are in parallel. The total capacitance is A. 2.43 F B. 4.86 F C. 100 F D. 152 F Answer: Option D 2. A capacitor and a resistor are connected in series to a sine wave generator. The …

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Energy and Power – General Questions

1. A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat? A. 33 B. 330 C. both resistors D. neither resistor Answer: Option D 2. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured …

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