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Diagnostic Exam

Total questions: 100

Worksheet time: 1hrs 6mins

Name
Class
Date
1.

What particles create the flow of electricity?

a)

Protons

b)

Electrons

c)

Neutrons

d)

Positrons

2.

What is an example of a conductor?

a)

Copper

b)

Plastic

c)

Iron

d)

Rubber

3.

What is an example of an insulator?

a)

Copper

b)

Plastic

c)

Iron

d)

Rubber

4.

If you touch a hair dryer with wet hands, you risk an electric shock. What makes your risk of electric shock higher when your hands are wet?

a)

Water makes your hands more conductive

b)

Water makes your hands a better insulator

c)

Water creates electricity

d)

Water destroys electricity

5.

What is the best example of an insulator.

a)

Copper

b)

Iron

c)

Tin

d)

Wood

6.

What is the best example of a conductor.

a)

Silver

b)

Wood

c)

Plastic

d)

Rubber

7.

What list has materials listed from worst to best conductor.

a)

Metals, drinking water, silicon, wood, rubber

b)

Drinking water, wood, silicon, rubber, metals

c)

Rubber, wood, drinking water, silicon, metals

d)

Silicon, drinking water, metals, wood, rubber

8.

Which of the following materials is consider a good conductor?

a)

Wool

b)

Silicon

c)

Copper

d)

Glass

9.

Which of the follow materials is consider an insulator?

a)

Silicon

b)

Glass

c)

Gold

d)

Lemon Juice

10.

Which of the follow materials is consider an semiconductor?

a)

Silicon

b)

Glass

c)

Gold

d)

Lemon Juice

11.

What is the most common semiconductor material used for producing integrated circuits

a)

Quartz

b)

Silicon

c)

Diamond

d)

Tantalum

12.

Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of

a)

diode

b)

semiconductor

c)

conductor

d)

insulator

e)

superconductor

13.

which statement is correct? (the dark circles represent the electrons)

a)

p-type of the diode is connected to the negative terminal.

b)

Electron moves across the p-n junction, makes the diode forward biased

c)

current will not flow in the circuit

d)

reverse biased circuit

14.
A Diode has .............
a)
two pn junction
b)
one pn junction
c)
three pn junction
d)
none of the above
15.
Name this electronic component
a)
Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Transistor
16.
In an NPN transistor, the N regions are
a)
base and emitter
b)
base and collector
c)
emitter and collector
d)
base and ground
17.

The voltage across an LED is 1.5 V when it is in a circuit with 9 V battery and a 225 Ω resistor. What is the current through the resistor?

a)

6.7 mA

b)

33 mA

c)

40 mA

d)

47 mA

18.

How is conduction increased in an p-type semiconductor?

a)

by increased applied electrical field

b)

by decreased applied electrical field

c)

by the availability of extra holes

d)

by the availability of donor electrons

19.

A material that conducts electricity well tends to have ____.

a)

no valence electrons

b)

partially filled bands

c)

completely filled bands

d)

conduction and valence bands that are far apart

20.
1. The resistivity of a semiconductor lies between 
a)
(a)10 -6 Ωm to10-8 Ωm
b)
n(b) 108 Ωm to1014 Ωm
c)
(c) 10 -2 Ωm to104 Ωm
d)
(d) none of these
21.
2. The forbiddenn energy gap for Germanium is of the order of
a)
(a) 0.7 eV
b)
(b) 0.3 eV
c)
(c) 1.1 eV
d)
(d) 10 eV
22.
3. Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
a)
(a) Boron 
b)
Arsenic
c)
Indium
d)
Gallium
23.
The reverse saturation current in a PN Junction diode is only due to 
a)
majority carriers
b)
minority carriers
c)
acceptor ions
d)
donor ions
24.
The efficiency of a half wave rectifier is
a)
40%
b)
40.6%
c)
46%
d)
81.2%
25.
The reciprocal of the slope of the input characteristics curve of NPN transistor in CE mode is equal to its
a)
Input impedance
b)
output impedance
c)
output admittance
d)
current gain
26.
The phase difference between the input and output voltages  in CE amplifier is
a)
π/4
b)
π/2
c)
π
d)
2π
27.

Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of

a)

diode

b)

semiconductor

c)

conductor

d)

insulator

e)

superconductor

28.

Which is not one of the properties of semiconductor?

a)

4 electrons in outermost orbit, in covalent bonding.

b)

atoms vibrate causes electron to break free from the bonds.

c)

Electron free leaves hole.

d)

Semiconductor has 2 types of charge carriers.

e)

all of the above are the properties of it

29.

Doping of Semiconductors

a)

materials which can conduct electricity better than insulator, but not as well as conductors.

b)

The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.

c)

when 4 electrons in outermost orbit.

30.

These are the characteristics of pentavalent impurities except

a)

•5 valence electron.

b)

•contributing extra free electrons.

c)

•produce n-type semiconductors.

d)

•produce p-type semiconductors.

31.

These are the characteristics of Trivalent impurities except

a)

•3 valence electrons

b)

•produce p-type semiconductors

c)

•producing a "hole".

d)

Boron, aluminium and gallium are the examples.

e)

Antimony, arsenic, and phosphorus are the examples

32.

which statement is correct? (the dark circles represent the electrons)

a)

p-type of the diode is connected to the negative terminal.

b)

Electron moves across the p-n junction, makes the diode forward biased

c)

current will not flow in the circuit

d)

reverse biased circuit

33.

what is the meaning of rectification?

a)

a process of smoothing using a capacitor

b)

a process of adding impurities to pure materials

c)

a process of converting an alternating current into a direct current by using a diode.

34.

The diagram is a process

a)

of doping

b)

of adding impurities

c)

of half-wave rectification

d)

of full-wave rectification

35.

This is a graph that is seen on CRO. How is it change after full wave rectification process?

a)
b)
c)
d)
36.

Choose the diagrams that show smoothing process has occured

a)
b)
c)
d)
37.

Every known element has

a)

the same type of atoms

b)

the same number of atoms

c)

a unique type of atom

d)

several different types of atoms

38.

An atom consists of

a)

one nucleus and only one electron

b)

one nucleus and one or more electrons

c)

protons, electrons and neutrons

d)

answer (b) and (c)

39.

The nucleus of an atom is made up of

a)

protons and neutrons

b)

electrons

c)

electrons and protons

d)

electrons and neutrons

40.

Valence electrons are

a)

in the closest orbit to the nucleus

b)

in the most distant orbit from the nucleus

c)

in various orbits around the nucleus

d)

not associated with a particular atom

41.

The most widely used semi-conductive material in electronic device

a)

germanium

b)

carbon

c)

cooper

d)

silicon

42.

The energy band in which free electrons exist is the

a)

first band

b)

second band

c)

conductive band

d)

valence band

43.

The current in a semiconductor is produced by

a)

electron only

b)

holes only

c)

negative ions

d)

both electrons and holes

44.

The process of adding an impurity to an intrinsic semiconductor is called

a)

doping

b)

recombination

c)

atomic modification

d)

ionization

45.

The majority carrier in an n-type semiconductor are

a)

holes

b)

valences electrons

c)

conduction electrons

d)

protons

46.

A pn junction is formed by

a)

the recombination of electrons and holes

b)

ionization

c)

the boudary of a p-type and an n-type material

d)

the collision of a proton and a neutron

47.
In reverse biasing 
a)
the resistance in the circuit is very high
b)
he resistance in the circuit is very low
48.
In forward biasing 
a)
the resistance in the circuit is very high
b)
he resistance in the circuit is very low
49.
Diode is used as a full wave rectifier.
a)
It rectifies only one half of the input AC signal
b)
It rectifies both the  halves of the input AC signal
50.
Diode is used as a half wave rectifier.
a)
It rectifies only one half of the input AC signal
b)
It rectifies both the  halves of the input AC signal
51.
Diode 
a)
 allows current to flow in one direction
b)
 allows current to flow in two directions
c)
is a resistor
52.

A transistor has …………………

a)

one pn junction

b)

two pn junctions

c)

three pn junctions

d)

four pn junctions

53.

A transistor is a …………… operated device

a)

Voltage

b)

Both Voltage and Current

c)

Current

d)

None of the Above

54.

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

55.
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
56.

The biasing of a transistor is purely a _____ operation

a)

AC

b)

DC

c)

AC/DC

d)

Q-point

57.
What do you call when you apply a 12 Vdc to a transistor network to get 1 mA of collector current?
a)
small-signal analysis
b)
load-line analysis
c)
biasing
d)
amplification
58.
In biasing, what do we do on capacitors connected to the transistor network?
a)
replaced by an open circuit equivalent
b)
replaced by a close circuit equivalent
c)
considered as an actuator
d)
considered as switch
59.
What do you call the ratio of collector current to the base current?
a)
voltage gain
b)
alpha DC
c)
beta DC
d)
impedance
60.
For the transistor to work as an amplifier, which of the should be the correct bias?
a)
B-E Forward Bias
C-B Reverse Bias
b)
B-E Reverse Bias
C-B Reverse Bias
c)
C-E Forward Bias
C-B Forward Bias
d)
B-E Reverse Bias
C-E Forward Bias
61.

In which circuit does the bulb light up?

a)
b)
c)
d)
62.

The street lights use electronic control system that switches the lights on when the surrounding is dark. What is the input sensor of the control system?

a)

A thermistor

b)

A light emitting diode

c)

A microphone

d)

A light dependent resistor

63.

Diagram shows a light controlled switch. The alarm will be activated when

a)

the surrounding is dark

b)

the surrounding is bright

c)

the temperature of the surrounding is high

d)

the temperature of the surrounding is low

64.
What is this?
a)
reistore
b)
diode
c)
dimmer
d)
potentiometer
65.
What is this?
a)
spider
b)
IC 
c)
transistor
d)
transformer
66.
What are these?
a)
Light Emitting Diode
b)
transistors
c)
SCR
d)
diodes
67.
What are these?
a)
Diodes
b)
Transistors
c)
Light Emitting Diodes
d)
Lights
68.
A material in which electrons are able to move easily
a)
Circuit
b)
Insulator 
c)
Resistance 
d)
Conductor 
69.
What happens to the BJT if biased outside of its maximum operating conditions?
a)
lag
b)
unstable
c)
hot
d)
no effects
70.
Which of the following analysis is/are used in determining Q-point?
a)
Graphical Method
b)
Mathematical Method
c)
Graphical and Mathematical Method
d)
none of the above
71.
What do you call when you apply a 12 Vdc to a transistor network to get 1 mA of collector current?
a)
small-signal analysis
b)
load-line analysis
c)
biasing
d)
amplification
72.
Which of the following configuration that is popularly used due to its low sensitivity to changes in beta DC?
a)
fixed bias
b)
emitter stabilized
c)
voltage divider
d)
feedback
73.
In biasing, what do we do on capacitors connected to the transistor network?
a)
replaced by an open circuit equivalent
b)
replaced by a close circuit equivalent
c)
considered as an actuator
d)
considered as switch
74.
Which of the following parameters of BJT is very sensitive to temperature?
a)
RE
b)
beta DC
c)
VCC
d)
RTh
75.
What do you call the ratio of collector current to the base current?
a)
voltage gain
b)
alpha DC
c)
beta DC
d)
impedance
76.
For the transistor to work as an amplifier, which of the should be the correct bias?
a)
B-E Forward Bias
C-B Reverse Bias
b)
B-E Reverse Bias
C-B Reverse Bias
c)
C-E Forward Bias
C-B Forward Bias
d)
B-E Reverse Bias
C-E Forward Bias
77.
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
78.
How does the amplification occur in the AC domain?
a)
shorting the capacitors
b)
Application of DC biasing level
c)
taking the input and output impedances
d)
DC sources are all grounded.
79.
Which of the following is the first step in analyzing BJT in AC domain?
a)
setting all DC sources to 0 and replaced them a short circuit equivalent
b)
all capacitors are replaced by short circuit
c)
connecting the BJT to a coupling and bypass capacitors
d)
all elements bypassed will be replaced by a short circuit equivalent
80.
Which of the following CANNOT be measured by and ohmmeter
a)
resistance
b)
impedance
c)
dc currents
d)
dc voltages
81.
Which of the following is a linear operation of amplifier?
a)
amplified replica, out of phase
b)
amplified replica, clipped, out of phase
c)
amplified replica, zero impedance
d)
replica, out of phase
82.
Which of the following will result to the clipping of the output signal?
a)
Q-point with no resistance
b)
too large base current
c)
no DC source
d)
Q-point with zero impedance
83.
Which of the following will result to the clipping of the output signal?
a)
Q-point with no resistance
b)
too large base current
c)
no DC source
d)
Q-point with zero impedance
84.
They are capacitors, inductors, resistors, or combination used to link two circuits.
a)
bypass devices
b)
couplers
c)
linkers
d)
amplifiers
85.
What happens to a bypass-capacitor when analyzed in the AC domain?
a)
open
b)
shorted
c)
as is
d)
act as a dc source
86.
What happens to the element or part of the circuit that is parallel to a bypass capacitor?
a)
shorted
b)
open
c)
no effect
d)
acts as a DC source
87.
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
88.
a)
b)
c)
d)
89.
a)
Toggle switch
b)
Push switch
c)
Rocker switch
d)
Micro switch
90.
a)
Light dependent resistor
b)
Resistor
c)
Transistor
d)
Light emitting diode
91.
a)
Battery snap
b)
Battery
c)
Micro switch
d)
Light dependent resistor
92.

The Schematic diagram shows:

a)

LED

b)

Resistor

c)

Transistor

d)

Relay

93.

Name this component

a)

LED

b)

Photodiode

c)

LDR

d)

variable resistor

94.

Name this component

a)

Photodiode

b)

LED

c)

LDR

d)

Variable resistor

95.

Name this output device

a)

Speaker

b)

LDR

c)

LED

d)

Buzzer

96.

What is this?

a)

Diode

b)

LED

c)

Capacitor

d)

Cell

97.
What are these?
a)
transistors
b)
resistors
c)
capacitors
d)
IC 's
98.
This is the symbol for ...
a)
resistor
b)
NPN Transistor
c)
light dependent resistor
d)
variable capacitor
99.
This is the symbol for ...
a)
light dependent resistor
b)
Variable Inductor (coil )
c)
Light Emitting Diode
( LED ) 
d)
transistor
100.
Name this electrical component
a)
Diode
b)
Fixed Resistor
c)
Transistor
d)
Photocell

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