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Transistors

Total questions: 50

Worksheet time: 29mins

Name
Class
Date
1.

What is meant by BJT?

a)

Bipolar junction transistor

b)

Bi junction terminal

c)

Bi unit junction transistor

2.

How many terminals does a BJT have?

a)

2

b)

3

c)

4

d)

5

3.

Emitter is _______ doped

a)

Moderately

b)

Lightly

c)

Heavily

4.

Collector is _____________ doped

a)

Moderately

b)

Lightly

c)

Heavily

5.

Base is ____________ doped

a)

Moderately

b)

Heavily

c)

Lightly

6.

Input side of transistor is _________ biased to make it work as an amplifier.

a)

forward

b)

reverse

c)

not

7.

Output side of transistor is _________ biased to make it work as an amplifier.

a)

Forward

b)

Reverse

c)

not

8.

BJT configurations are_____________

a)

CC,CE,CF

b)

CA,CB,CD

c)

CB,CE,CC

9.

Transistors act like tiny "____________."

a)

Electron sources

b)

Switches

c)

Batteries

d)

Bees?

10.

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

11.

One function of the transistor is to_____________?

a)

rectify

b)

amplify

c)

limit

d)

control

12.

What is the type of transistor shown in the diagram below?

a)

𝑝𝑛𝑝

b)

𝑛𝑝𝑛

c)

𝑛𝑛𝑝

d)

𝑝𝑝𝑛

e)

𝑝𝑝𝑝

13.

Transistors are mainly used as _____.

a)

resistors

b)

rectifiers

c)

insulators

d)

capacitors

e)

Current amplifiers

14.

In an npn-transistor, conventional current passes

from the _______.

a)

base to the emitter

b)

emitter to the base

c)

collector to the emitter

d)

diode to the collector

e)

rectifier to the collector

15.

Current through the collector is ____ the current

through the base.

a)

a little smaller than

b)

a little larger than

c)

much smaller than

d)

much larger than

e)

the same as

16.

Which one is the largest region?

a)

Base

b)

Emitter

c)

Collector

d)

Ground

17.

Which mode do NOT have current flow?

a)

Cut-off

b)

Active

c)

Linear

d)

Saturation

18.

When a transistor becomes an amplifier, it is in _____ mode.

a)

saturation

b)

cut-off

c)

Active

19.

The smallest current in a transistor is the ____ current.

a)

base

b)

collector

c)

emitter

20.

Which one is alpha, α?

a)

0.99

b)

1

c)

39

d)

200

21.

Given emitter current and collector current is 10mA and 9.8mA. Base current, IB is

a)

10 mA

b)

9.8 mA

c)

0.2 mA

d)

19.8 mA

22.

What is this pin called with the arrow?

a)

Emitter

b)

Base

c)

Collector

d)

Transistor

23.

What is this pin called with the arrow?

a)

Emitter

b)

Base

c)

Collector

d)

Transistor

24.

What is this pin called with the arrow?

a)

Emitter

b)

Base

c)

Collector

d)

Transistor

25.

Which pin controls the transistor? (On/off)

a)

Emitter

b)

Base

c)

Collector

d)

None

26.

A transistor is made up of what components?

a)

LEDs

b)

Resistors

c)

Diodes

d)

Capacitors

27.

Which transistor is this?

a)

PNP

b)

NPN

c)

Neither

d)

Both

28.

Which transistor is this?

a)

PNP

b)

NPN

c)

Neither

d)

Both

29.

In P-N-P transistor, base will be of

a)

P material

b)

N material

c)

Either of the above

d)

None of the above

30.

In a transistor with normal bias

a)

The emitter junction offers high resistance

b)

The emitter junction reverse biased

c)

The emitter junction has a low resistance

31.

What is the Input Voltage in CB Configuration

a)

VBE

b)

VEB

c)

VBC

d)

VCB

32.

What is the Output Voltage in CB Configuration

a)

VBE

b)

VEB

c)

VBC

d)

VCB

33.

What is the Input current in CB Configuration

a)

IE

b)

IB

c)

IC

d)

ICBO

34.

What is the Output current in CB Configuration

a)

IE

b)

IB

c)

IC

d)

ICBO

35.

What is the Input Voltage in CE Configuration

a)

VBE

b)

VEB

c)

VBC

d)

VCB

36.

What is the Output Voltage in CE Configuration

a)

VBE

b)

VEB

c)

VCE

d)

VCB

37.

What is the Input current in CE Configuration

a)

IE

b)

IB

c)

IC

d)

ICBO

38.

What is the Output current in CE Configuration

a)

IE

b)

IB

c)

IC

d)

ICBO

39.

Relate Output resistance in CE configuration with that of CB Configuration

a)

Ro in CB > Ro in CE

b)

Ro in CB <Ro in CE

c)

Ro in CB =Ro in CE

d)

None of these

40.
Current that reverses direction in a regular pattern is called ____. 
a)
direct current 
b)
circuit current
c)
magnetic current
d)
alternating current 
41.
Which resistor will prevent the most current flow?
a)
1 ohm
b)
100 ohms
c)
1000 ohms
d)
0.5k ohms
42.

The unit of electrical potential is the ? , which is represented by the letter ? .

a)

ampere/A

b)

resistance/R

c)

volt/V

d)

watt/W

43.

What source of energy does this use?

a)
b)
c)
44.
This is the symbol for a ...
a)
Bulb
b)
Battery
c)
Horn
d)
Fuse
45.
This is the circuit symbol for ...
a)
an AC current source
b)
a DC current source
c)
an ammeter
d)
a voltmeter
46.
a)
push switch
b)
diode
c)
circuit breaker
d)
fuse
47.

In a Transistor ………………..

a)

IE = IC + IB

b)

IC = IE + IB

c)

IE = IC – IB

d)

IB = IC + IE

48.

The block diagram of Linear DC Power Supply with CORRECT stage

a)

Transformer, Regulator, Filter, Rectifier, Voltage Divider

b)

Transformer, Rectifier, Filter, Regulator, Voltage Divider

c)

Transformer, Filter, Rectifier, Regulator, Voltage Divider

d)

Transformer, Rectifier, Regulator, Filter, Voltage Divider

49.

A resistor operated at 140 V dc is rated at 1.40 kW.

(a) What is the normal operating current through the resistor?

(b) What is the resistance of the resistor?

a)

(a) 10 A . (b) 14 Ω

b)

(a) 14 A . (b) 14 Ω

c)

(a) 10 A . (b) 10 Ω

d)

(a) 0.010 A . (b) 14000 Ω

50.
a)
b)
c)
d)

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