Online Electronics Test - Electronics Test 3

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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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Precision refers to the difference between the measured value and the accepted value.

True

False

[#]

(12.6 × 10⁶)(10.5 × 10³) = ________.

13.2 × 10¹²

1.32 × 10¹²

1.32 × 10¹¹

13.2 × 10¹¹

[#]

Which is the smallest?

atom

proton

neutron

electron

[#]

Parallel circuits have only one path for current.

True

False

[#]

As additional resistors are connected to a parallel circuit, the total resistance will ___.

increase

increase by the value of the resistor being connected

decrease

remain unchanged

[#]

When the south poles of two bar magnets are brought close together, there will be a force of attraction.

True

False

[#]

A peak current of 12.5 mA is equivalent to ___.

an rms value of 25 mA

an average value of 12.5 mA

a peak-to-peak value of 6.25 mA

an average value of 7.96 mA

[#]

In a 20 Vac series RC circuit, if 20 V is read across the resistor and 40 V is measured across the capacitor, the applied voltage is

45 Vac

50 Vac

60 Vac

65 Vac

[#]

When used as a filter, an inductor is

placed in series with the load and aids any current changes

placed in parallel with the load and aids any current changes

placed in parallel with the load and opposes any current changes

placed in series with the load and opposes any current changes

[#]

10.

The time difference, or lag, between flux density and magnetizing force is known as:

eddy current

magnetic saturation

hysteresis

coercivity

[#]

11.

Fixed transformers have:

a center-tapped secondary

multiple windings

turns ratios that cannot be changed

a multiple-tapped secondary

[#]

12.

A transformer has

primary and secondary windings, both of which are considered inputs

primary and secondary windings, both of which are considered outputs

a primary winding used as an output and a secondary winding used as an input

a primary winding used as an input and a secondary winding used as an output

[#]

13.

At any given time in an intrinsic piece of semiconductor material at room temperature

electrons drift randomly

recombination occurs

holes are created

All of the above

[#]

14.

A noninverting closed-loop op-amp circuit generally has a gain factor:

less than one

greater than one

of zero

equal to one

[#]

15.

A square and a rectangular waveform appear to have a step voltage transition.

True

False

[#]

16.

The PUT (programmable unijunction transistor) is actually a type of:

UJT thyristor

FET device

TRIAC

SCR

[#]

17.

A multiplexer is a device that chooses which output to send an input to by means of select lines.

True

False

[#]

18.

The serial-in, parallel-out shift register transfers data from one parallel data bus to another parallel data bus one bit at a time across a single line.

True

False

[#]

19.

When two counters are cascaded, the overall mod number is equal to the __________ of their individual mod numbers.

product

sum

log

reciprocal

[#]

20.

A binary-weighted digital-to-analog converter has an input resistor of 100 k

. If the resistor is connected to a 5 V source, the current through the resistor is:

5 mA

500

50 mA

[#]

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Online Electronics Test - Electronics Test 3

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