# Computer Electronic Principles MCQ Test – Set 03

PDF Free Download as per computer science new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of computer science. Each question has four options followed by the right answer. These computer science MCQ Questions are selected supported by the newest exam pattern.

(A) 50 A
(B) 12 A
(C) 5 A
(D) 20 A

(A) 1/4
(B) 1/3
(C) 2
(D) 3

(A) 4
(B) 29
(C) 14
(D) 48

## Q4. What is the difference between a conductor and an insulator?

(A) A conductor allows current to flow much easier than an insulator does
(B) An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
(C) An insulator allows current to flow much easier than a conductor does
(D) The difference between conductors and insulators depends on how they are used

Answer: (A) A conductor allows current to flow much easier than an insulator does

## Q5. The total capacitance of a series capacitor circuit is:

(A) Equal to the sun 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 value of the smallest capacitor

Answer: (D) Less than the value of the smallest capacitor

## Q6. What is the barrier potential of a silicon diode at room temperature?

(A) 0.7 V
(B) 0.3V
(C) 1 V
(D) 2 mV per degree Celsius

## Q7. Which one of the following principles best describes the basic operation of an electromagnet?

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

Answer: (C) Current flowing through a conductor generates a magnetic field

## Q8. Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?

(A) 20 k Ohm or more
(B) 200 k Ohm or less
(C) 200 k Ohm or more
(D) 20 km or less

Answer:(B) 200 k Ohm or less

## Q9. When a parallel RLC circuit is operating at its resonant frequency:

(A) Capacitive reactance is greater than the inductive reactance
(B) Inductive reactance is greater than the capacitive reactance
(C) Inductive reactance is equal to the capacitive reactance
(D) The difference between inductive and capacitive reactance is equal to the resistance

Answer: (C) Inductive reactance is equal to the capacitive reactance

## Q10. Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?

(A) Clockwise
(B) Counterclockwise

## Q11. What is one important thing transistors do?

(A) Emit light
(B) Amplify weak signals
(C) Regulate voltage
(D) Rectify line voltage

## Q12. When a series RLC circuit is operating at its resonant frequency:

(A) Capacitive reactance is greater than the inductive reactance
(B) Inductive reactance is greater than the capacitive reactance
(C) Inductive reactance is equal to the capacitive reactance
(D) The difference between inductive and capacitive reactance is equal to the resistance

Answer: (C) Inductive reactance is equal to the capacitive reactance

(A) 692.2 Ohm
(B) 844.5 Ohm
(C) 3890 Ohm
(D) 1234 Ohm

## Q14. A low-pass filter:

(A) Passes lower-frequency signals and reduces higher-frequency signals
(B) Passes higher-frequency signals and reduces lower-frequency signals
(C) Has no effect on ac signals
(D) Reduces the level of all frequencies by a significant amount

Answer: (A) Passes lower-frequency signals and reduces higher-frequency signals

## Q15. What causes the depletion layer?

(A) Doping
(B) Recombination
(C) Barrier potential
(D) Ions