Online Electronics Test - Electronics Test - Random

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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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One coulomb of charge passing a point in one second is one ampere of current.

True

False

[#]

The value of a resistor is in direct proportion to its power handling capabilities.

True

False

[#]

The total resistance is 35

True

False

[#]

If a 1 k

and a 2 k

resistor are parallel-connected across a 12 V supply, how much current is received by the 2 k

resistor?

4 mA

6 mA

8 mA

12 mA

[#]

The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called hysteresis.

True

False

[#]

A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.

retentivity

reluctance

hysteresis

flux

[#]

A turns ratio of 5 for a transformer implies:

more primary turns than secondary turns

more secondary current than primary current

larger source impedance than load impedance

more secondary turns than primary turns

[#]

A henry value divided by a circuit resistive value provides the:

counter emf value

induced voltage amplitude

rise or decay time constant

quality factor of the coil

[#]

What circuit activity may shift a characteristic curve so that diode operating points are different?

higher power (heat)

higher resistance

lower voltage

lower current

[#]

10.

With a 12 V supply, a silicon diode, and a 370-ohm resistor in series, what voltage will be dropped across the diode?

0.3 V

0.7 V

0.9 V

1.4 V

[#]

11.

The ac input resistance (R_in) of a voltage-divider biased common-emitter amplifier consists of ____________.

[#]

12.

A portion of the output that provides circuit stabilization is considered to be:

negative feedback

distortion

open-loop

positive feedback

[#]

13.

An op-amp has very low open-loop gain.

True

False

[#]

14.

What are the two major categories for resistors?

low and high ohmic value

commercial and industrial

low and high power value

fixed and variable

[#]

15.

Most of the electrons in the base of an NPN transistor flow:

out of the base lead

into the collector

into the emitter

into the base supply

[#]

16.

A MOSFET has how many terminals?

2 or 3

3 or 4

[#]

17.

The gate-biased JFET characteristic curve includes I_DS.

True

False

[#]

18.

A common-drain configured JFET is also called a source-follower.

True

False

[#]

19.

If the output of a gate is OFF when the inputs are the same, and ON when they are different, the gate must be an exclusive-OR.

True

False

[#]

20.

CMOS logic is probably the best all-around circuitry because of its:

packing density

low power consumption

very high noise immunity

low power consumption and very high noise immunity

[#]

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