Online Electronics Test - Electronics Test 5

Instruction:

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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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What is the dc source voltage?

78 V

39 V

13 V

0 V

[#]

With 6 V applied, what is the voltage across R₂ of a parallel combination of R₂ (1 k

), R₃ (2 k

), and R₄ (1 k

) in series with R₁, whose value is 2 k

1 V

3 V

5 V

6 V

[#]

The power dissipated by R4 is 211 mW.

True

False

[#]

The unit of flux density is known as

magnetomotive force

a weber

a maxwell

a tesla

[#]

What is the impedance of an ac RC parallel circuit if the resistance is 12 ohms and the capacitive reactance equals 5 ohms?

0.2 ohms

3.5 ohms

4.6 ohms

13 ohms

[#]

What is the true power of a 24 Vac parallel RL circuit when R = 45

and X_L = 1100

313.45 W

12.8 W

44.96 W

22.3 W

[#]

The impedance of the circuit in the given circuit is approximately equal to _____.

2 k

750

1.25 k

1 k

[#]

The secondary voltages produced by a center-tapped transformer are equal in amplitude but 180° out of phase with respect to the center tap.

True

False

[#]

Thermal shutdown occurs in an IC regulator if:

power dissipation is too high

internal temperature is too high

current through the device is too high

load resistance increases

[#]

10.

The mimicking of an open/closed switch by a diode allows alternating current to be:

rectified

regulated

controlled

attenuated

[#]

11.

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

negative feedback

distortion

open-loop

positive feedback

[#]

12.

An OTA is primarily a current-to-voltage amplifier.

True

False

[#]

13.

Isolation amps are named as such because they are sealed for protection from outside environmental damage.

True

False

[#]

14.

After a lamp is turned on, its filament resistance will change to become:

less resistive

cooler

brighter

more resistive

[#]

15.

4 amperes will flow through a 10

resistor if 20 volts are placed across the resistor.

True

False

[#]

16.

How will a D-MOSFET input impedance change with signal frequency?

As frequency increases input impedance increases.

As frequency increases input impedance is constant.

As frequency decreases input impedance increases.

As frequency decreases input impedance is constant.

[#]

17.

The two basic types of signals are analog and:

digilog

digital

vetilog

sine wave

[#]

18.

The diodes in a seven-segment display where all cathodes are tied together and grounded are illuminated when a logic ____________________ is applied to the ____________________.

LOW, anodes

LOW, count down control line

HIGH, anode

HIGH, count up control line

[#]

19.

The time interval between the memory receiving a new address input and the data being available is called _________.

access time

bus speed

read/write speed

write/data speed

[#]

20.

The flash method of analog-to-digital conversion (ADC) uses comparators that compare reference voltages with the analog input voltage.

True

False

[#]

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Online Electronics Test - Electronics Test 5

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