# Electronic Principles Questions with Answers – Set 09

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(A) 0.24 W
(B) 0.625 W
(C) 80 W
(D) 325 kW

## Q2. Doubling the operating frequency of a capacitive circuit:

(A) Doubles the amount of a capacitive reactance
(B) Has no effect on the capacitive reactance
(C) Cuts the capacitive reactance in half
(D) Multiplies the capacitive reactance by 6.28

Answer: (C) Cuts the capacitive reactance in half

(A) Reluctance
(B) Permeability
(C) Permeance
(D) Retentivity

(A) P = I2R
(B) P = IE
(C) P = E2/R
(D) I = P/E

## Q5. A flashlight battery has internal resistance of 1W. For what values of load resistance does the flashlight battery appear stiff?

(A) 60 Ohm
(B) 50 Ohm
(C) 100 Ohm or more
(D) 10 Ohm

Answer: (C) 100 Ohm or more

## Q6. Which one of the following statements is true for the voltage in a parallel RC circuit?

(A) The voltage always has the same amplitude and phase for every part of the circuit
(B) The total voltage is equal to the sum of the voltages across the resistance and capacitance
(C) The total voltage leads the total current by less than 90 degree
(D) The total voltage is less than the sum of the voltages across the resistance and capacitance

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

## Q7. As the temperature increases, the current gain

(A) Increases
(B) Decreases
(C) Constant
(D) Can be any of the above

Answer: (C) An atom that contains more electrons than protons

## Q8. What is a negative ion?

(A) An atom that contains more electrons than neutrons
(B) An atom that contains more protons than neutrons
(C) An atom that contains more electrons than protons
(D) An atom that contains more protons than electrons

Answer:(C) An atom that contains more electrons than protons

## Q9. A circuit has a Norton current of 10 mA and a Norton resistance of 10 kW. What is the Thevenin circuit?

(A) 1000 V and a series resistance of 10 k Ohm
(B) 100 V and a parallel resistance of 10 k Ohm
(C) 100 V and a series resistance of 10 k Ohm
(D) 1000 V and a parallel resistance of 10 kOhm

Answer: (C) 100 V and a series resistance of 10 k Ohm

## Q10. What is a free electron?

(A) An electron that has been freed from its parent atom
(B) An electron that costs nothing
(C) An electron that has no electrical charge
(D) An electron that has twice the amount of charge of a normal electron

Answer: (A) An electron that has been freed from its parent atom

## Q11. Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit?

(A) Number of lines of force
(B) Flux density
(C) Reluctance
(D) Magnetomotive force

Answer: (A) Number of lines of force

## Q12. The value of a capacitor can be made larger by:

(A) Moving the plates further apart
(B) Moving the plates closer together
(C) Increasing the voltage applied to the plates
(D) Decreasing the voltage applied to the plates

Answer: (B) Moving the plates closer together

(A) Down
(B) Up
(C) Nowhere

## Q14. A device that converts mechanical pressure to electrical energy is called a:

(A) Piezoelectric device
(B) Solar cell
(C) Photodiode

## Q15. A farad is defined as the amount of capacitance necessary for:

(A) Dissipating 1 W of power
(B) Causing an ac phase shift greater than 90 degree
(C) Storing 1 V for 1 second
(D) Changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing

Answer: (D) Changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing

## Electronic Principles MCQ – All Set

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