Online Electronic Devices Test - Electronic Devices 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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Which of the following is an atom composed of?

Electrons

Protons

Neutrons

All of the above

[#]

For the ideal diode the transition between states will occur at the point on the characteristic curve when V_D = ________ V and I_D = ________ A.

0.3, 0

0, 0

0.7, 0

0.7, 0.3

[#]

In a transistor-switching network, the operating point switches from ________ to ________ regions along the load line.

cutoff, active

cutoff, saturation

active, saturation

None of the above

[#]

What is the controlling current in a common-base configuration?

I_e

I_c

I_b

None of the above

[#]

In an FET circuit, ________ is normally the parameter to be determined first.

V_GS

V_DS

V_DG

I_D

[#]

The ratio of current I_D to I_DSS is equal to ________ for a fixed-bias configuration.

0.25

0.5

[#]

Which of the following capacitors is (are) included in C_i for the high-frequency region of a BJT or FET amplifier?

Input wiring capacitance

The transition capacitance (

)

Miller capacitance

All of the above

[#]

By what factor does an audio level change if the power level changes from 4 W to 4096 W?

[#]

The maximum rate of change of the output voltage in response to a step input voltage is the ________ of an op-amp.

time constant

maximum frequency

slew rate

static discharge

[#]

10.

An RC network has R = 47 k

and C = 0.22

F. What is the cutoff frequency?

154 Hz

1540 Hz

1.54 Hz

15.4 Hz

[#]

11.

In a dc millivoltmeter, the amplifier provides a meter with ________ input impedance and a scale factor dependent on ________ value and accuracy.

high, resistor

low, resistor

high, capacitor

None of the above

[#]

12.

Calculate the efficiency of a transformer-coupled class A amplifier for a supply of 15 V and an output of V(p) = 10 V.

25%

33.3%

50%

78.5%

[#]

13.

The complementary Darlington-connected transistor for a class B amplifier provides ________ output current and ________ output resistance.

higher, higher

higher, lower

lower, lower

lower, higher

[#]

14.

________ transistors can be used to build a class B amplifier.

npn and pnp

nMOS and pMOS

Both npn and pnp or nMOS and pMOS

None of the above

[#]

15.

What is the ratio of the period of the output voltage to the period of the input voltage in a full-wave rectifier?

0.5

[#]

16.

Which of the following devices does not have a cathode terminal?

SCR

SCS

Triac

Shockley diode

[#]

17.

What is the typical value of the triggering anode gate for SCS devices?

1.5 mA

150 A

15 A

1 A

[#]

18.

For a forward-biased diode, the barrier potential ________ as temperature increases.

decreases

remains constant

increases

[#]

19.

The three FET terminals are called source, base, and drain.

True

False

[#]

20.

In an isolation amplifier, the third op-amp is used as a unity-gain differential amplifier.

True

False

[#]

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