Online Electronics Test - Electronics Test 10

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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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If the voltage across a fixed value of resistance is increased five times, what does the current do?

It increases by a factor of five.

It decreases by a factor of five.

It stays the same.

Not enough information

[#]

In a series–parallel circuit consisting of R₁ and R₂ in series and connected in parallel with R₃, if R₁ opens, then R₂'s voltage will:

increase

decrease

remain the same

cannot tell

[#]

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

[#]

What is the voltage across the capacitor?

7.07 V

1.11 V

111 mV

7.07 mV

[#]

Ceramic capacitors have higher voltage ratings than electrolytic capacitors.

True

False

[#]

The phase angle in the given circuit equals___.

90°

36.87°

0°

53.13°

[#]

Lenz's law states that the current induced in a circuit due to a change in the magnetic field is so directed as to oppose the change in flux or to exert a mechanical force opposing the motion.

True

False

[#]

Mutual induction is dependent on

winding ratios

output polarities

dc voltage levels

current changes

[#]

What has the voltage across the resistor decayed to by the end of the pulse in the given circuit?

0 V

0.75 V

5.55 V

14.25 V

[#]

10.

If a 169.7 V half-wave peak has an average voltage of 54 V, what is the average of two full-wave peaks?

119.9 V

108.0 V

115.7 V

339.4 V

[#]

11.

The peak inverse voltage (PIV) for the diode in the give circuit equals ___.

3 V

2.3 V

0 V

6 V

[#]

12.

This circuit is operating in a closed-loop mode.

True

False

[#]

13.

The silicon-controlled rectifier can be turned off

by a negative gate pulse

by forced commutation

with the off switch

when the breakover voltage is exceeded

[#]

14.

A commonly used pentavalent material is:

arsenic

boron

gallium

neon

[#]

15.

Forward bias of a silicon P-N junction will produce a barrier voltage of approximately how many volts?

0.2

0.3

0.7

0.8

[#]

16.

A TRIAC:

can trigger only on positive gate voltages

can trigger only on negative gate voltages

cannot be triggered with gate voltages

can be triggered by either a positive or a negative gate voltage

[#]

17.

A series of gradually decreasing sine wave oscillations is called:

ringing

slew

overshooting

undershooting

[#]

18.

Mod-6 and mod-12 counters are most commonly used in:

frequency counters

multiplexed displays

digital clocks

power consumption meters

[#]

19.

How many bits are used in the data bus?

[#]

20.

All computer programs for a machine are called ________.

software

firmware

hardware

none of the above

[#]

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Online Electronics Test - Electronics Test 10

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