# Electronic Principles Fundamentals MCQ – Set 12

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## Q1. Which one of the following phrases most accurately describes a purely capacitive circuit?

(A) Resistances provide the only opposition to current flow
(B) Capacitive reactance provides the only opposition to current flow
(C) The ac voltage leads the current by 90 degree
(D) Combinations of resistance and capacitive reactance provide any opposition to current flow

Answer: (B) Capacitive reactance provides the only opposition to current flow

## Q2. Which one of the following statements best applies to a parallel RLC circuit?

(A) The voltage waveform for each component always has the same amplitude and phase as the applied voltage
(B) The sum of the current is always less than the applied current
(C) The current waveform for each component always has the same amplitude and phase as the applied current
(D) All of the above

Answer: (A) The voltage waveform for each component always has the same amplitude and phase as the applied voltage

## Q3. Doubling the operating frequency of a purely inductive circuit:

(A) Doubles the amount of current through the inductors
(B) Has no effect on the current through the inductors
(C) Cuts the current through the inductors one-half
(D) Increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit

Answer: (C) Cuts the current through the inductors one-half

## Q4. What is the primary difference between primary and secondary cell batteries?

(A) Primary-cell batteries can be recharged and used many times, whereas secondary-cell batteries cannot be properly recharged
(B) Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged
(C) Primary-cell batteries use chemical cells, whereas secondary-cell batteries use an alternative energy source, such as thermal or magnetic energy, to supplement their outputs
(D) Primary-cell batteries must be recharged at a much slower rate that secondary-cell batteries

Answer: (B) Secondary-cell batteries can be recharged and used many times, whereas primary-cell batteries cannot be properly recharged

## Q5. The total inductance of a series inductor circuit is:

(A) Equal to the sum of the individual inductance values
(B) Equal to the sum of the individual inductive-reactance values
(C) Less than the value of the smallest inductor
(D) Equal to the source voltage divided by total current

Answer: (A) Equal to the sum of the individual inductance values

(A) 0.17 V
(B) 10.17 V
(C) 20 V
(D) 18.8 V

## Q7. The equivalent of 1 micro A is:

(A) 10000 A
(B) 1000 A
(C) One-millionth of an ampere
(D) One million amperes

Answer: (C) One-millionth of an ampere

## Q8. Which one of the following statements is true for the currents in a series RC circuit?

(A) The current always has the same amplitude and phase for every part of the circuit
(B) The total current is equal to the sum of the currents for the resistance and capacitance
(C) The total current is greater than the sum of the currents for the resistance and capacitance
(D) The total current is less than the sum of the currents for the resistance and capacitance

Answer: (A) The current always has the same amplitude and phase for every part of the circuit

## Q9. A dielectric material is:

(A) A good conductor
(B) A good insulator
(C) A poor conductor of electrostatic fields
(D) A good conductor of magnetic fields

## Q10. The rise time of a pulse waveform is the time required for the voltage to rise:

(A) From zero to its rms value
(B) From zero to its peak value
(C) From 10% of the peak value to 70.7% of the peak value
(D) From 10% of the peak value to 90% of the peak value

Answer: (D) From 10% of the peak value to 90% of the peak value

## Q11. What form of energy is used for creating static electricity?

(A) Solar energy
(B) Mechanical energy
(C) Chemical energy
(D) Light energy

(A) 20 Ohm
(B) 30 Ohm
(C) 10 Ohm
(D) 100 Ohm

## Q13. Which one of the following statements regarding ac circuits is correct?

(A) Current and voltages are in phase through a resistor
(B) Current leads the voltage through a resistor
(C) Current lags the voltage through a resistor
(D) None of the above

Answer: (A) Current and voltages are in phase through a resistor

## Q14. The knee voltage of a diode is approximately equal to the

(A) Applied voltage
(B) Barrier potential
(C) Breakdown voltage
(D) Forward voltage

(A) 0.3 A
(B) 0.2 A
(C) 0.4 A
(D) 0.6 A