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Bipolar Junction Transistor

Total questions: 35

Worksheet time: 18mins

Name
Class
Date
1.

To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?

a)

collector-emitter

b)

base-collector

c)

base-emitter

d)

collector-base

2.

Most of the electrons in the base of an NPN transistor flow:

a)

out of the base lead

b)

into the collector

c)

into the emitter

d)

into the base supply

3.

In a transistor, collector current is controlled by:

a)

collector voltage

b)

base current

c)

collector resistance

d)

all of the above

4.

Total emitter current is:

a)

IE – IC

b)

IC + IE

c)

IB + IC

d)

IB – IC

5.

A transistor has …………………

a)

one pn junction

b)

two pn junctions

c)

three pn junctions

d)

four pn junctions

6.

The base of a transistor is ………….. doped

a)

heavily

b)

moderately

c)

lightly

d)

none of the above

7.
What is the voltage drop across the B-E junction of a Si-made BJT?
a)
0.3 V
b)
0.7 V
c)
1.2 V
d)
2.3 V
8.
They are circuits or devices with the capability to increase output voltages or current compared to the input.
a)
couplers
b)
amplifiers
c)
conductors
d)
bypass components
9.

One function of the transistor is to_____________?

a)

rectify

b)

amplify

c)

limit

d)

control

10.

transistor has 3 electrodes namely

a)

PNP

b)

NPN

c)

Base/ Collector/ Emitter

d)

Drain/ Gate/ Source

11.
Which of the following is not a terminal or region of a BJT?
a)
base
b)
collector
c)
drain
d)
emitter
12.
In an NPN transistor, the N regions are
a)
base and emitter
b)
base and collector
c)
emitter and collector
d)
base and ground
13.
The transistor's region of operation when base current is equal to zero
a)
cutoff
b)
saturation
c)
breakdown
d)
active
14.
The region of operation of a transistor where base-emitter junction has a low resistance due to forward bias and the base-collector junction has a high resistance due to reverse bias
a)
cutoff
b)
saturation
c)
breakdown
d)
active or linear
15.

Which junction is forward biased when transistor is used as an amplifier?

a)

Emitter-Base

b)

Emitter-Collector

c)

Collector-Base

d)

No junction is forward biased

16.

What is the expression for the Current Gain, β?

a)

ΔIc / ΔVc

b)

ΔIc / ΔIB

c)

ΔVCE / ΔVBE

d)

ΔIc / ΔVB

17.

Transistors act like tiny "____________."

a)

Electron sources

b)

Switches

c)

Batteries

d)

Bees?

18.

What are the names of the terminals X, Y and Z?

a)

X = Base, Y = Collector, Z = Emitter

b)

X = Emitter, Y = Base, Z = Collector

c)

X = Collector, Y = Base, Z = Emitter

d)

X = Collector, Y = Emitter, Z = Base

19.

A transistor is a …………… operated device

a)

Voltage

b)

Both Voltage and Current

c)

Current

d)

None of the Above

20.

Which one is NPN transistor?

a)
b)
c)
d)
21.

FET is

a)

Function Emitter Transistor

b)

Field Emitter Transistor

c)

Function Effect Transistor

d)

Field Effect Transistor

22.

If the transistor operates such that it is either in the saturation or cut-off region, it is operating as

a)

a filter

b)

a switch

c)

a signal amplifier

d)

an emitter follower

23.

What is the type of the transistor shown?

a)

PNP

b)

NPN

c)

BJT

24.

IC = αIE + ………….

a)

IB

b)

ICEO

c)

ICBO

25.

In a transistor ………………..

a)

IE = IC + IB

b)

IB = IC + IE

c)

IE = IC – IB

26.

Emitter current is very small compare to base current and collector current

a)

True

b)

False

27.

The emitter current is the sum of the collector current and the base current for both npn and pnp types of BJT

a)

True

b)

False

28.

When the transistor is in saturation, base-emitter and base-collector junctions are reverse-biased

a)

True

b)

False

29.

At the base-emitter junctions of a transistor, one finds

a)

a reverse bias

b)

a wide depletion layer

c)

low resistance

d)

none of the above

30.

Most of the majority carriers from the emitter

a)

recombine in the base

b)

recombine in the emitter

c)

pass through the base region to the collector

d)

none of the above

31.

The emitter-base junction of a transistor is ___ Biased while the collector-base junction is

a)

Reverse, Forward

b)

Reverse, Reverse

c)

Forward, forward

d)

Forward, reverse

32.

The name transistor is derived from ___ that means the resistance is changed.

a)

ten resistor”

b)

“transfer run”

c)

“transfer resistor”

d)

None of the above

33.

In a pnp transistor, the current carriers are

a)

holes

b)

donor ions

c)

acceptor ions

d)

free electrons

34.

Which is true

a)

IE=  α\alpha  IB+Ico

b)

IC=  α\alpha  IB+Ico

c)

IB=  α\alpha  IE+Ico

d)

IC=  α\alpha  IE+Ico

35.

 α\alpha  is

a)

voltage amplification factor

b)

current amplification factor

c)

electron amplification factor

d)

hole amplification factor

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