Electrical Circuits MCQs

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What is the complex impedance of a circuit with an absolute resistance of 300 Ω?

  • A. 0 j 300 Ω
  • B. 300 j 90 Ω
  • C. 0 - j 300 Ω
  • D. 300 j 0 Ω
  • Correct Answer: Option D

Which of the following elements is active?

  • A. Resistor
  • B. Inductor
  • C. Capacitor
  • D. Ideal voltage source
  • Correct Answer: Option D

Which of the statements below is not true?

  • A. Current source is an active element
  • B. Resistor is a linear element
  • C. Voltage source is a passive element
  • D. Diode is a non-linear element
  • Correct Answer: Option C

The ohmic value of a resistor with negative temperature coefficient

  • A. Increases with increasing temperature
  • B. Increase with decreasing temperature
  • C. Stays unchanged with temperature change
  • D. Stays unaffected even with increasing temperature
  • Correct Answer: Option B

In a pure capacitance,

  • A. Current leads voltage by 90˚
  • B. Current leads voltage by 180˚
  • C. Current lags voltage by 90˚
  • D. Current lags voltage by 180˚
  • Correct Answer: Option A

In an RL series circuit,

  • A. Current lags voltage by less than 90˚
  • B. Current lags voltage by 180˚
  • C. Current lags voltage by 90˚
  • D. Current leads voltage by 90˚
  • Correct Answer: Option A

At parallel resonance, the currents flowing through L and C are

  • A. Infinite
  • B. Zero
  • C. Unequal
  • D. Equal
  • Correct Answer: Option D

A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in series, the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.

  • A. Child's law
  • B. CR law
  • C. Coulomb's law
  • D. Debye T3 law
  • Correct Answer: Option B

An alloy composed of 84 % copper, 12 % manganese and 4 % nickel.

  • A. Manganin
  • B. Constantan
  • C. Nichrome
  • D. German silver wire
  • Correct Answer: Option A

A factor that states how much the resistance changes for a change in temperature?

  • A. esistivity
  • B. Specific resistance
  • C. Coefficient of temperature change
  • D. Temperature coefficient of resistance
  • Correct Answer: Option D