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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Determining r_d to a high degree of accuracy from a characteristic curve is very accurate.

True

False

[#]

There is(are) ________ in the internal construction of a TO-92 package.

gold bond wires

a copper frame

epoxy encapsulation

All of the above

[#]

It is desirable to design a bias circuit that is independent of the transistor beta.

True

False

[#]

As the temperature increases,

________, V_BE ________, and I_CO ________ in value for every 10ºC.

increases, decreases, doubles

decreases, increases, remains the same

decreases, increases, doubles

increases, increases, triples

[#]

At which of the following is the level of V_DS equal to the pinch-off voltage?

When I_D becomes equal to I_DSS

When V_GS is zero volts

I_G is zero

All of the above

[#]

In the n-channel transistor, the drain and source are connected to the ________ channel while the gate is connected to the two layers of ________ material.

p-type, n-type

p-type, p-type

n-type, p-type

n-type, n-type

[#]

Calculate the value of R_S. Assume V_GSQ = −2V.

0 k

1.68 k

6.81 k

8.5 k

[#]

A(n) ________ amplifier configuration has an input impedance approximately equal to the input resistor R_i and an output impedance approximately equal to the output impedance of the op-amp itself.

non-inverting

inverting

voltage-follower

[#]

Refer to this figure. The purpose of R₃ is

for bias current compensation.

for input offset voltage compensation.

to set input impedance.

to set input impedance and voltage gain.

[#]

10.

A ________ differential amplifier is particularly well suited for battery operation due to its low power consumption.

BiFET

BiMOS

CMOS

BJT

[#]

11.

Determine the output voltage.

10(V₂ – V_i)

–10(V₂ – V₁)

–10(V₁ – V₂)

None of the above

[#]

12.

In class B power amplifiers, the output signal varies for ________ of the cycle.

360º

180º

between 180º and 360º

less than 180º

[#]

13.

What is the maximum temperature limit for liquid-crystal displays (LCDs)?

10ºC

30ºC

60ºC

100ºC

[#]

14.

Which one of the SCR terminals fires the SCR?

Anode

Cathode

Gate

All of the above

[#]

15.

Back-to-back varactor diodes are used for what reason?

over-voltage protection

a wider tuning range

to eliminate harmonic distortion

no reason; only zeners are used in a back-to-back configuration

[#]

16.

What are the two types of bipolar junction transistors?

npn and pnp

pnn and nnp

ppn and nnp

pts and stp

[#]

17.

A 35 mV signal is applied to the base of a properly biased transistor with an r'_e = 8

and R_C = 1 k

. The output signal voltage at the collector is:

3.5 V

28.57 V

4.375 mV

4.375 V

[#]

18.

The lower critical frequency is also known as the

break frequency.

cutoff frequency.

corner frequency.

all of the above

[#]

19.

One of the key characteristics of an instrumentation amplifier is high input impedance.

True

False

[#]

20.

The positive feedback voltage in an oscillator has no net phase shift.

True

False

[#]

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