MCQ

 Here are the next 25 questions:

Network Theorems and Analysis Techniques (Continued)

 * Thevenin's theorem is used to simplify a circuit to an equivalent circuit consisting of:

 * a) A single voltage source and a series resistor

 * b) A single current source and a parallel resistor

 * c) Two voltage sources in series

 * d) Two current sources in parallel

 * Norton's theorem is used to simplify a circuit to an equivalent circuit consisting of:

 * a) A single voltage source and a series resistor

 * b) A single current source and a parallel resistor

 * c) Two voltage sources in series

 * d) Two current sources in parallel

 * Superposition theorem is applicable to:

 * a) Linear circuits only

 * b) Non-linear circuits only

 * c) Both linear and non-linear circuits

 * d) None of the above

 * Maximum power transfer theorem states that maximum power is transferred to the load when:

 * a) Load resistance is equal to source resistance

 * b) Load resistance is greater than source resistance

 * c) Load resistance is less than source resistance

 * d) Load resistance is zero

 * Millman's theorem is used to find the equivalent:

 * a) Voltage source of parallel voltage sources

 * b) Current source of parallel current sources

 * c) Resistance of series resistors

 * d) Inductance of series inductors

AC Circuit Analysis (Continued)

 * The impedance of a series RL circuit is:

 * a) R + jωL

 * b) R - jωL

 * c) 1/(R + jωL)

 * d) 1/(R - jωL)

 * The impedance of a series RC circuit is:

 * a) R + jωC

 * b) R - jωC

 * c) 1/(R + jωC)

 * d) 1/(R - jωC)

 * The power factor of a circuit with an impedance of 10 + j10 ohms is:

 * a) 0.707

 * b) 0.866

 * c) 1

 * d) 0.5

 * The resonant frequency of a series RLC circuit is:

 * a) 1/(LC)

 * b) 1/(2πLC)

 * c) 1/(√LC)

 * d) 1/(2π√LC)

 * The quality factor of a series RLC circuit is a measure of:

 * a) The bandwidth of the circuit

 * b) The phase shift between voltage and current

 * c) The power dissipation in the circuit

 * d) The resonant frequency of the circuit

Three-Phase Circuits

 * A balanced three-phase system consists of:

 * a) Three single-phase systems with a phase difference of 120 degrees

 * b) Two single-phase systems with a phase difference of 90 degrees

 * c) A single-phase system with three different voltage levels

 * d) A single-phase system with three different current levels

 * In a balanced three-phase system, the line voltage is:

 * a) Equal to the phase voltage

 * b) √3 times the phase voltage

 * c) 1/√3 times the phase voltage

 * d) Twice the phase voltage

 * Power in a balanced three-phase system is measured in:

 * a) VA

 * b) VAR

 * c) Watts

 * d) All of the above

 * Power factor in a three-phase system is:

 * a) The ratio of real power to apparent power

 * b) The ratio of reactive power to apparent power

 * c) The ratio of apparent power to real power

 * d) The ratio of reactive power to real power

 * Power factor correction is done to:

 * a) Improve the power factor

 * b) Reduce the power factor

 * c) Increase the apparent power

 * d) Decrease the real power

Magnetic Circuits

 * The SI unit of magnetic flux density is:

 * a) Weber

 * b) Tesla

 * c) Gauss

 * d) Ampere-turn

 * The reluctance of a magnetic circuit is analogous to:

 * a) Resistance in an electric circuit

 * b) Inductance in an electric circuit

 * c) Capacitance in an electric circuit

 * d) Voltage in an electric circuit

 * The magnetic field intensity H is related to the magnetic flux density B by:

 * a) B = μH

 * b) H = μB

 * c) B = H/μ

 * d) H = B/μ

 * The core of a transformer is usually made of:

 * a) Copper

 * b) Aluminum

 * c) Iron

 * d) Carbon

 * The efficiency of a transformer is:

 * a) The ratio of output power to input power

 * b) The ratio of input power to output power

 * c) The ratio of losses to input power

 * d) The ratio of losses to output power