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## Q1. How much current flows through a 0.02 micro F capacitor that is operating from a 12-V ac, 100-Hz source?

(A) 0.151 mA

(B) 157 mA

(C) 0.995 mA

(D) 2.02 A

Answer: (A) 0.151 mA

## Q2. Which one of the following is a statement of Kirchhoffs current law?

(A) The current through a resistance is proportional to the value of resistance and the IR drop across it

(B) The total current in a parallel circuit is less than the value of the smallest current

(C) The algebraic sum of currents in a loop is equal to zero

(D) The algebraic sum of currents entering and leaving a point is equal to zero

Answer: (C) The algebraic sum of currents in a loop is equal to zero

## Q3. The rotating coil of wire in an electric motor is called the:

(A) Armature

(B) Brush

(C) Commutator

(D) Loop

Answer: (A) Armature

## Q4. To get the Thevenin voltage, you have to

(A) Short the load resistor

(B) Open the load resister

(C) Short the voltage source

(D) Open the voltage source

Answer: (A) Short the load resistor

## Q5. What is the difference between the kinds of charges for an electron and a proton?

(A) An electron has a positive charge and a proton has no charge

(B) An electron has a positive charge and a proton has a negative charge

(C) An electron has a negative charge and a proton has a positive charge

(D) An electron has a negative charge and a proton has no charge

Answer: (C) An electron has a negative charge and a proton has a positive charge

## Q6. What is the turns ratio for the transformer specified in the above question?

(A) 10.738

(B) 0.707

(C) 1.5

(D) 0.575

Answer: (B) 0.707

## Q7. A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?

(A) 2 k Ohm

(B) 10 k Ohm

(C) 20 k Ohm

(D) 1 k Ohm

Answer: (D) 1 k Ohm

## Q8. Doubling the diameter of the coil in an inductor:

(A) Multiplies the value of inductance by two

(B) Reduces the value of inductance by one-half

(C) Reduces the value of inductance by one-fourth

(D) Multiplies the value of inductance by four

Answer: (A) Multiplies the value of inductance by two

## Q9. The direction of electron current flow is:

(A) From right to left

(B) From positive to negative

(C) From negative to positive

(D) From neutral to positive

Answer: (C) From negative to positive

## Q10. A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?

(A) 3.75 mA

(B) 3.2 mA

(C) 0.05 mA

(D) 13 mA

Answer: (A) 3.75 mA

## Q11. The net charge of a neutral copper atom is

(A) 0

(B) +1

(C) -1

(D) +4

Answer: (B) +1

## Q12. One henry of inductance is defined as:

(A) The amount of counter emf required to reduce a current to 1 A

(B) The amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second

(C) The amount of inductance required to change the frequency of a current by 1 Hz

(D) The number of turns of wire in an inductor multiplied by the amount of current flowing through it

Answer: (B) The amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second

## Q13. Which one of the following devices is most often used for measuring electrical potential difference?

(A) Voltmeter

(B) Ohmmeter

(C) Ammeter

(D) Wattmeter

Answer: (A) Voltmeter

## Q14. An audio transformer has a turn ratio of 9, what is its impedance ratio?

(A) 81

(B) 85

(C) 6

(D) 9

Answer: (A) 81

## Q15. 1 Microfarad is the same as:

(A) 1 millionth of a picofarad

(B) 1000 millifarads

(C) 1 million picofarads

(D) 1 million farads

Answer: (C) 1 million picofarads

## Electronic Principles MCQ – All Set

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