# Electronic Principles Multiple Choice Questions and Answers – Set 01

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## Q1. Doubling the operating frequency of a purely capacitive circuit:

(A) Has no effect on the total circuit current
(B) Doubles the amount of total current
(C) Cuts the total current by one-half
(D) Thrice the amount of total current

Answer:(B) Doubles the amount of total current

## Q2. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

(A) Doping
(B) Valence electrons
(C) Free electrons
(D) Thermal energy

Answer: (D) Thermal energy

(A) 37.4 V
(B) 35.4 V
(C) 38.74 V
(D) 30.4 V

(A) 200 W
(B) 1000 W
(C) 20 W
(D) 100 W

## Q5. The core of an electromagnet is said to be in saturation when:

(A) The core is permitted to move freely within the coil
(B) An increase in current through the coil causes no further increase in the mmf
(C) Frequent changes in the direction of current through the coil causes heating effects in the core material
(D) Changing the polarity of the current in the coil changes the polarity of the magnetic field around the core

Answer: (B) An increase in current through the coil causes no further increase in the mmf

## Q6. Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?

(A) 5 Ohm
(B) 50 Ohm or more
(C) 100 Ohm
(D) 6 Ohm

Answer: (B) 50 Ohm or more

## Q7. If the current gain is 200 and the collector current is 100 mA, the base current is

(A) 2 mA
(B) 0.5 mA
(C) 2 A
(D) 200 A

Answer: (B) 0.5 mA

## Q8. Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 500 mA, what is the current through the second diode

(A) 11 mA
(B) 12 mA
(C) 10 mA
(D) 14 mA

Answer: (C) 10 mA

## Q9. The value of a capacitor can be made larger by:

(A) Increasing the area of the plates
(B) Decreasing the area of the plates
(C) Increasing the frequency of the applied voltage
(D) Increasing the voltage applied to the plates

Answer: (A) Increasing the area of the plates

## Q10. Which one of the following phrases most accurately describes the nature of a pulsating dc voltage?

(A) The voltage remains at one polarity and at a steady level
(B) The voltage remains at one polarity but changes value periodically
(C) The voltage causes current to flow in two directions at the same time
(D) The voltage reverses polarity periodically

Answer: (B) The voltage remains at one polarity but changes value periodically

## Q11. The venin theorem replaces a complicated circuit facing a load by an

(A) Ideal voltage source and parallel resistor
(B) Ideal current source and parallel resistor
(C) Ideal voltage source and series resistor
(D) Ideal current source and series resistor

Answer:(C) Ideal voltage source and series resistor

## Q12. The total capacitive reactance of a parallel capacitor circuit is:

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

Answer:(C) Equal to the source voltage divided by total current

## Q13. Which one of the following principles best describes the basic operation of a generator?

(A) Like magnetic poles repel; unlike poles attract
(B) Current is induced in a conductor that is moving through a magnetic field
(C) Like magnetic poles attract; unlike poles repel
(D) Current flowing through a conductor generates a magnetic field

Answer: (B) Current is induced in a conductor that is moving through a magnetic field

## Q14. Reducing the amount of current through an inductor:

(A) Reduces the value of inductance by one-half
(B) Multiplies the value of inductance by four
(C) Multiplies the value of inductance by two
(D) Has no effect on the inductance

Answer: (D) Has no effect on the inductance

## Q15. Which one of the following statements best applies to a series RLC circuit?

(A) The voltage waveform for each component always has the same amplitude and phase as the applied voltage
(B) The current waveform for each component always has the same amplitude and phase as the applied current
(C) The sum of the current is always less than the applied current
(D) None of the above

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

## Electronic Principles MCQ – All Set

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