Online Electronic Devices Test - Electronic Devices 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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Determine the current through each diode if E₁ = E₂ = 0 V.

4.65 mA

9.3 mA

18.6 mA

0.7 mA

[#]

The lower doping level ________ the conductivity and ________ the resistivity of the material.

increases, decreases

increases, increases

decreases, decreases

decreases, increases

[#]

In a common-base configuration, the input and output voltages are ________ and the output and input currents are ________.

180º out of phase, 180º out of phase

180º out of phase, in phase

in phase,180º out of phase

in phase, in phase

[#]

What is the level of drain current I_D for gate-to-source voltages V_GS less than (more negative than) the pinch-off level?

zero amperes

I_DSS

Negative value

Undefined

[#]

A junction field-effect transistor (JFET) is a ________ device.

current-controlled

voltage-controlled

voltage-current controlled

None of the above

[#]

The input controlling variable for an FET transistor is a ________ level.

resistor

current

voltage

All of the above

[#]

Refer to this figure. If R₇ were to decrease in value, V_out would

increase.

decrease.

remain the same.

distort.

[#]

The range of output admittance y_os for FETs is ________.

S–10

S –50

S –100

200

S –500

[#]

Calculate the output voltage if V₁ = V₂ = 0.15 V.

0 V

4.65 V

6.45 V

–6.45 V

[#]

10.

Refer to the given figure. The resonant frequency is controlled by

C₃ and L₁.

C₂, C₄, C₅, and L₁.

C₃, C₄, C₅, and L₁.

C₃, C₄, C₅, and L₂.

[#]

11.

For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using X_C = ________.

0.707 ÷ C

1.414 ÷ C

1.3 ÷ C

0.785 ÷ C

[#]

12.

What type of temperature coefficient do thermistors have?

Positive

Negative

Either positive or negative

None of the above

[#]

13.

Which of the following materials is (are) used in the manufacturing of thermistors?

A mixture of oxides of cobalt, nickel, strontium, or manganese

All of the above

[#]

14.

An intrinsic crystal is one that contains a small amount of impurities.

True

False

[#]

15.

Refer to this figure. If V_IN increases, I_Z will

increase.

decrease.

remain the same.

[#]

16.

The forward voltage across an LED is typically 0.7 V.

True

False

[#]

17.

Which transistor bias circuit arrangement provides good stability using negative feedback from collector to base?

base bias

collector-feedback bias

voltage-divider bias

emitter bias

[#]

18.

What three areas are the drain characteristics of a JFET (V_GS = 0) divided into?

ohmic, constant-current, breakdown

pinch-off, constant-current, avalanche

ohmic, constant-voltage, breakdown

[#]

19.

The common-gate configuration has extremely high input resistance.

True

False

[#]

20.

A comparator with a Schmitt trigger has

two trigger levels.

a fast response.

a slow response.

one trigger level.

[#]

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Online Electronic Devices Test - Electronic Devices Test 3

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