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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The voltage across R3 is 20 volts.

True

False

[#]

An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?

1 volt

3 volts

5 volts

7 volts

[#]

The phase angle

of an RC series circuit is

= invtan (X_C/R) = invtan (V_C/V_R).

True

False

[#]

For series ac circuits containing both resistance and inductive reactance, total opposition to current can be found by simply adding ohmic values or oppositions to current.

True

False

[#]

What is the current phase angle for a parallel RLC circuit when I_L = 15.3 A, I_C = 0.43 A, and I_R = 3.5 A?

76.7 degrees

–4.25 degrees

88.8 degrees

–76.7 degrees

[#]

An open secondary winding of a transformer will cause the primary current to be nearly zero.

True

False

[#]

The collector current in a class A amplifier flows for ________ of the ac input signal.

< 180°

180°

< 360°

360°

[#]

Clampers are often called peak detectors.

True

False

[#]

A potentiometer has how many leads?

[#]

10.

How do fixed resistors usually fail?

slowly over time

by increasing their value

by becoming an open circuit

by increasing their value and becoming an open circuit

[#]

11.

The letter in the Greek alphabet used to represent wavelength is __________.

lambda

theta

omega

delta

[#]

12.

In "n" type material, majority carriers would be:

holes

dopants

slower

electrons

[#]

13.

What is the current gain for a common-base configuration where I_E = 4.2 mA and I_C = 4.0 mA?

16.80

1.05

0.20

0.95

[#]

14.

Often a common-collector will be the last stage before the load; the main function(s) of this stage is to:

provide voltage gain

provide phase inversion

provide a high-frequency path to improve the frequency response

buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer

[#]

15.

Transconductance is also called mutual conductance.

True

False

[#]

16.

The charge carriers in a junction field effect transistor (JFET) will flow from source to drain in a p-channel and from drain to source in an n-channel.

True

False

[#]

17.

Sensor outputs destined for a digital computer system must first be processed by __________.

a DAC

an ADC

the MPU

a PLD

[#]

18.

The weight of the LSB as a binary number is:

[#]

19.

In order to use a shift register as a counter, ________.

the register's serial input is the counter input and the serial output is the counter output

the parallel inputs provide the input signal and the output signal is taken from the serial data output

a serial-in, serial-out register must be used

the serial output of the register is connected back to the serial input of the register

[#]

20.

A 4-bit PISO shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse.

right, one

right, two

left, one

left, three

[#]

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