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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
Q6. Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?
(A) 0.17 V
(B) 10.17 V
(C) 20 V
(D) 18.8 V
Answer: (A) 0.17 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
Answer: (B) A good insulator
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
Answer: (D) Light energy
Q12. Suppose a voltage source has an ideal voltage of 15V and a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?
(A) 20 Ohm
(B) 30 Ohm
(C) 10 Ohm
(D) 100 Ohm
Answer:(A) 20 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
Answer: (B) Barrier potential
Q15. Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?
(A) 0.3 A
(B) 0.2 A
(C) 0.4 A
(D) 0.6 A
Answer: (B) 0.2 A
Electronic Principles MCQ – All Set
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