Multiple Choice Questions
-
The resistance of a metal conductor increases with increasing temperature.
- A: True
- B: False
-
The inductivereactance of a pure inductor is:
- A: L
- B: ωL
- C: 1/ωL
- D: 1/2πfL
-
In a sinusoidal AC resistive circuit, the correct relationship between current and voltage is:
- A: i = U/R
- B: i= Um/R
- C: I = U/R
- D: I = Um/R
-
In some cases, to shorten the conduction time of a thyristor, the trigger current is increased by two times.
- A: True
- B: False
-
The average value of a half-wave rectified sinusoidal voltage is:
- A: Vm/π
- B: Vm/2
- C: Vm/2π
- D: Vm/4
-
The root mean square (RMS) value of a sinusoidal voltage is:
- A: Vm
- B: Vm/√2
- C: Vm/2
- D: Vm/4
-
The power factor of a circuit with a resistance R and an inductance L is given by:
- A: R/L
- B: L/R
- C: 1/(R² + L²)
- D: R/(R² + L²)
-
The resonant frequency of a series RLC circuit is:
- A: ωo = √(1/LC)
- B: ωo = √(LC)
- C: fo = √(LC)
- D: fo = 1/(2π√LC)
-
The impedance of a parallel RLC circuit is given by:
- A: Z = (R² + (1/ωC)²)/(R + (1/ωC)²)
- B: Z = √(R² + (1/ωC)²) + (1/ωL)²
- C: Z = R + (1/ωC)² + (1/ωL)²
- D: Z = (R² + (1/ωC)²) - (1/ωL)²
-
The output voltage of a transformer is inversely proportional to its turns ratio.
- A: True
- B: False
Answer Key
- A
- B
- A
- A
- A
- B
- C
- A
- A
- A
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