Online Computer Science Test - Electronic Principles Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The total inductance of a series inductor circuit is:

equal to the sum of the individual inductance values

equal to the sum of the individual inductive-reactance values

less than the value of the smallest inductor

equal to the source voltage divided by total current

None of the above

[#]

Doubling the number of turns of wire in an inductor:

reduces the value of inductance by one-half

multiplies the value of inductance by two

multiplies the value of inductance by four

reduces the value of inductance by one-fourth

None of the above

[#]

Which one of the following statements best describes magnetic hysteresis?

Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet

Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

Hysteresis is most apparent when the core material is saturated

None of the above

[#]

What form of energy is used for creating static electricity?

Solar energy

Mechanical energy

Chemical energy

Light energy

None of the above

[#]

A device that converts mechanical into electrical energy is?

solar cell

thermocouple

chemical cell

generator

None of the above

[#]

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

The voltage remains at one polarity and at a steady level

The voltage remains at one polarity but changes value periodically

The voltage causes current to flow in two directions at the same time

The voltage reverses polarity periodically

None of the above

[#]

Current and voltage are said to be in phase when:

their waveforms are both ac or both dc

they have the same amplitude and frequency

their waveforms cross through zero and reach positive and negative peaks at the same time

All of the above

None of the above

[#]

For normal operation of the transistor, the collector diode has to be

Forward-biased

Reverse-biased

Nonconducting

Operating in the breakdown region

None of the above

[#]

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

Voltmeter

Ohmmeter

Ammeter

Wattmeter

None of the above

[#]

10.

In a step-down transformer, which is larger?

Primary voltage

Secondary voltage

Neither

Impossible to say

None of the above

[#]

11.

How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?

0.24 W

0.625 W

80 W

325 kW

None of the above

[#]

12.

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

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

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

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

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

None of the above

[#]

13.

Which one of the following statements is true for the impedance of a series RC circuit?

The impedance is greater than the sum of the resistance and capacitive reactance

The impedance is equal to the sum of the resistance and capacitive reactance

The impedance is greater than either the resistance or capacitive reactance but less than their sum

The impedance is less than the sum of the resistance and capacitive reactance

None of the above

[#]

14.

If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point

down

nowhere

off the load line

None of the above

[#]

15.

To get the Thevenin voltage, you have to

Short the load resistor

Open the load resister

Short the voltage source

Open the voltage source

None of the above

[#]

16.

Which one of the following statements is true?

Power dissipation of a pure capacitor increases with operating frequency

Power dissipation of a pure capacitor decreases with operating frequency

There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency

All of the above

None of the above

[#]

17.

Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?

200 W

1000 W

20 W

100 W

None of the above

[#]

18.

The direction of conventional current flow is:

from negative to positive

from positive to negative

from left to right

from neutral to positive

None of the above

[#]

19.

Which one of the following statements is true?

Capacitive reactance is at a minimum for dc source voltages

Capacitive reactance decreases as the operating frequency increases

There is no meaningful relationship between capacitive reactance and operating frequency

Capacitive reactance increases as the operating frequency increases

None of the above

[#]

20.

Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?

R = E²/P

P = PR

P = E²/R

I = P/E

None of the above

[#]

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Online Computer Science Test - Electronic Principles Test

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