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Electronics

Total questions: 131

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

Choose the diagrams that show smoothing process has occured

a)
b)
c)
d)
2.

The nature of the coil in shunt field winding is (a)  

3.
According to the NFPA what is the max safe  Voltage near water?
a)
12
b)
30
c)
50
d)
120
4.
a)

A

b)

B

c)

C

d)

D

5.
These components can hold phantom voltage even after they are unplugged from power.
a)
Resistors
b)
Diodes
c)
Capacitors
d)
Transistors
6.
a)
b)
c)
d)
7.
What is the human body's reaction to trauma or severe injury?
a)
Shock
b)
Jolt
c)
Wrath
8.
a)

A

b)

B

c)

C

d)

D

9.

what is this?

a)

it is a transistor

b)

it is a diode

c)

it is a capacitor

d)

it is a resistance

10.

Identify the electronic symbol.

a)

Diode

b)

Photodiode

c)

Reflective diode

d)

Light Emitting Diode

11.

what type of device is this?

a)

it is a transistor

b)

it is a diode

c)

it is an amplifier

d)

it is a power supply

12.
a)
b)
c)
d)
13.

Number of turns of the coil in the series wound generator is (a)  

14.
a)

A

b)

B

c)

C

d)

D

15.

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

16.
What is the purpose of a safety observer?
a)
Remove Power and call for help in an accident
b)
Insure safety glasses are worn
c)
take over in an accident
17.
What is another name for electrical shock?
a)
Volt
b)
Jolt
c)
Bolt
d)
Colt
18.

The combination of series wound generator and shunt wound generator is known as (a)  

19.
What is a material that allows for current to flow easily called?
a)
Conductor
b)
Capacitor
c)
Inductor
d)
Insulator
20.
What is the unit of measurement of electrical Intensity or current flow?
a)
Ampere
b)
Ohm
c)
Volt
d)
Watt
21.

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

22.
a)
b)
c)
d)
23.

The Resistance of the shunt field winding is (a)  

24.
What does AC stand for?
a)
Alienating cowboys
b)
Alternating Current
c)
Alternate Calculations
d)
Arub Chili
25.
a)
b)
c)
d)
26.
a)

A

b)

B

c)

C

d)

D

27.
a)
b)
c)
d)
28.
a)
b)
c)
d)
29.
a)

A

b)

B

c)

C

d)

D

30.
Define electrical current.
a)
Flow of atoms
b)
Flow of electrons
c)
Flow of decepticons
d)
Flow from the diner
31.
What is safety?
a)
State of free from harm
b)
A button on your 1187 Remington
c)
A pin for holding diapers on
32.
a)
b)
c)
d)
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.

How many select lines are required for a 1-to-4 demultiplexer?

a)

3

b)

2

c)

1

35.
What is a one time circuit protection device that OPENS on too much current?
a)
Fuse
b)
Resistor
c)
Switch
d)
Relay
36.

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.

37.
a)

2 V

b)

3 V

c)

5 V

d)

8 V

38.
What are two steps for treating traumatic shock?
a)
keep warm and lower feet
b)
keep warm and elevate feet
c)
keep cool and lower feet
d)
keep cool and chill out yo
39.
According to the NFPA what is the max safe AC Voltage?
a)
12
b)
30
c)
50
d)
120
40.
a)
b)
c)
d)
41.

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

a)
b)
c)
d)
42.
a)

A

b)

B

c)

C

d)

D

43.
a)

A

b)

B

c)

C

d)

D

44.

The diagram is a process

a)

of doping

b)

of adding impurities

c)

of half-wave rectification

d)

of full-wave rectification

45.
What do we call a material that opposes or contains the flow of electrons.
a)
Conductor
b)
Capacitora
c)
Inductor
d)
Insulator
46.

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

47.
What is Electromotive Force commonly called?
a)
Amperage
b)
Inductance
c)
Resistance
d)
Voltage
48.
What does DC stand for?
a)
Driven Current
b)
Direct Current
c)
Driven Capacitance
d)
Direct Capacitance
49.

Diagram below shows a p-n junction diode.

When the diode is in reverse biased, the depletion layer widens because

a)

the electrons and holes are pulled away from

the p-n junction

b)

the electrons from the n-type are pulled across

the p-n junction

c)

the negative charges flow from the negative

terminal to the p-type semiconductor

d)

the positive charges flow from the positive

terminal to the n-type semiconductor

50.

What is this?

a)

Television

b)

Pot?

c)

LDR

d)

Resistor?

51.

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

52.
a)
b)
c)
d)
53.
a)

A

b)

B

c)

C

d)

D

54.
A device that opens on over current like a fuse but can be reset and reused.
a)
Relay
b)
Breaker
c)
Resistor
d)
Deflector
55.
a)
b)
c)
d)
56.

Diagram 24 shows four diodes which are connected to form a rectifier. Which wave pattern is produced on the C.R.O. screen?

a)
b)
c)
d)
57.
Define Accident.
a)
Unplanned event
b)
Car wreck
c)
Near miss
58.
a)

A

b)

B

c)

C

d)

D

59.

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.

60.
a)
b)
c)
d)
61.
a)

A

b)

B

c)

C

d)

D

62.
a)
b)
c)
d)
63.
Define Electrical Resistance
a)
Opposition to current flow
b)
Inflection of current flow
c)
Misdirection of current flow
d)
I really don't know
64.
a)
b)
c)
d)
65.
Who sets the NATIONAL ELECTRICAL CODE and max safe voltages?
a)
HSA
b)
HUD
c)
NFPA
d)
NASA
66.
a)

A

b)

B

c)

C

d)

D

67.
a)

A

b)

B

c)

C

d)

D

68.
a)

A

b)

B

c)

C

d)

D

69.
According to the NFPA what is the max safe DC Voltage?
a)
12
b)
30
c)
50
d)
120
70.
a)

A

b)

B

c)

C

d)

D

71.
a)

A

b)

B

c)

C

d)

D

72.

The difference between half adder and full adder is __________

a)

Half adder has two inputs while full adder has four inputs

b)

Half adder has two inputs while full adder has three inputs

c)

Half adder has one output while full adder has two outputs

73.

The main function of pole shoe is____

a)

distribute flux uniformly and provide low reluctance path

b)

carries field winding

c)

rotates evenly

d)

none

74.

The armature conductor of a 6 pole, lap wound d.c generator are divided into_____________parallel paths

a)

2

b)

3

c)

6

d)

4

75.

If the PIV rating of a diode is exceeded, ………………

a)

the diode conducts poorly

b)

the diode is destroyed

c)

the diode behaves like a zener diode

d)

none of the above

76.

One's compliment of 1011

a)

0101

b)

1000

c)

0100

77.

Losses in a d.c generator which vary with load are called_______

a)

constant losses

b)

variable losses

c)

constant and variable loss

d)

none

78.

The reverse current in a diode is of the order of ………………

a)

kA

b)

mA

c)

uA

d)

A

79.

In a _________ circuit, the total resistance is greater than the largest resistance in the circuit.

a)

Series

b)

Parallel

c)

Either series or parallel

d)

Neither series nor parallel

80.

What is resistance?

a)

A law stating that electric current is proportional to voltage and inversely proportional to resistance.

b)

A measure of its opposition to the flow of electric current.

81.

What is the symbol for n-p-n transistor?

a)
b)
c)
d)
82.

What is an example of an input?

a)

Sound

b)

LED light

c)

Microcontroller

d)

Push button

83.

The PIV rating of each diode in a bridge rectifier is ……………… that of the equivalent centre-tap rectifier

a)

same

b)

twice

c)

half

d)

three times

84.

Binary equivalent of  131013_{10}  

a)

1101

b)

1111

c)

1010

85.

what is a transistor?

a)

a current amplifier

b)

a rectifier

c)

a power supply

d)

an adder device

86.

What is not another word for potential difference?

a)

Voltage

b)

Resistance

c)

Electrical Potential

d)

Electric Pressure

87.

What is a circuit?

a)

A path in which electrons from a voltage or current source flow.

b)

The rate of flow of electric charge past a point or region.

88.

What is the difference between a series and parallel circuit?

a)

A parallel circuit has one path for electrons and series circuits have more than one path.

b)

A parallel circuit has more than one path for electrons and series circuits have only one path.

89.

Zener diode acts as a

a)

rectifier

b)

voltage regulator

c)

potentiometer

d)

galvanometer

90.

Principle of DC generator is_____

a)

Electromagnetic induction

b)

Magnetism

c)

Electro statics

d)

none

91.

what is an oscillator?

a)

an amplifier

b)

a power supply

c)

a multimeter

d)

a signal generator

92.

Which of the following is the correct transistor circuit symbol?

a)
b)
c)
d)
93.

Doping is a process of adding a certain amount of specific impurities to semiconductor. What is the purpose of doping?

a)

To increase the resistance of semiconductor

b)

To increase the thermal energy of semiconductor

c)

To increase the temperature of the semiconductor

d)

To increase the conductivity of the semiconductor

94.

The following circuit diagrams show four diodes connected to an a.c power supply.

Which circuit will make the bulb lights up the brightest?

a)
b)
c)
d)
95.
Current is measured in:
a)
Ohms
b)
Voltage
c)
Amperes
d)
Watts
96.

Armature reaction is..

a)

weakens and distorts main magnetic flux

b)

weakens and distorts armature flux

c)

only weakens the armature

d)

only weakens the magnetic flux

97.

If field magnets are energized from an independent source is called___

a)

self excited dc generator

b)

separately excited dc generator

c)

d.c generator

d)

A.C generator

98.

Mechanical losses includes_________

a)

hysterisis and eddy current loss

b)

shunt winding and series winding

c)

windage and bearing losses

d)

none

99.

What is the function of a diode?

a)

Acts as a current amplifier

b)

Acts as an automatic switch

c)

Stores electric charge

d)

Allows the current to pass in one direction only

100.
What is the tolerance for a Green, Red, Black, Gold resistor?
a)
1%
b)
20%
c)
5%
d)
10%
101.

What is a generator?

a)

Any device for converting mechanical energy into electrical energy by electromagnetic induction

b)

A device used to transfer electric energy from one circuit to another

c)

A voltage source is a device (with two ends) that can maintain a fixed voltage

102.

The main function of pole core is_____

a)

acts as support and carries field coil

b)

distribute flux uniformly and provide low reluctance path

c)

reduces friction

d)

collects current

103.

Two's complement  of 00110

a)

11010

b)

01010

c)

11011

104.

one of the method to correcting armature reaction is___

a)

Adding componsating winding

b)

changing armature core

c)

changing magnetic flux

d)

none

105.

What is a transformer?

a)

A region around a magnetic material or a moving electric charge within which the force of magnetism acts.

b)

Any device for converting mechanical energy into electrical energy by electromagnetic induction

c)

A device used to transfer electric energy from one circuit to another

106.

For subtracting 1 from 0, we use to take a _______ from neighbouring bits.

a)

Carry

b)

Borrow

c)

Input

107.

What is an ohm?

a)

The SI derived unit of electrical resistance

b)

A unit of electric current equal to a flow of one coulomb per second

108.

In P type Semiconductors, the majority carriers will be.................

a)

Electrons

b)

Holes

c)

both

d)

phonons

109.

The maximum efficiency of a half-wave rectifier is ………………..

a)

91.3

b)

66.6

c)

40.6

d)

80.2

110.

The forward voltage drop across a Germanium diode is about …………………

a)

3.3 V

b)

2.7 V

c)

0.7 V

d)

0.3 V

111.

What electronic component allows current to flow in one direction only?

a)

Resistor

b)

LED

c)

Diode

d)

Switch

112.

In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etc.?

a)

voltage

b)

current

c)

both voltage and current

d)

neither voltage and current

113.

What is a magnetic field?

a)

Each of the two points or regions of an artificial or natural magnet to and from which the lines of magnetic force are directed.

b)

A region around a charged particle or object within which a force would be exerted on other charged particles or objects.

c)

A region around a magnetic material or a moving electric charge within which the force of magnetism acts.

114.

What electronic component allows current to flow in one direction only?

a)

Resistor

b)

LED

c)

Diode

d)

Switch

115.
What material is a resistor made of?
a)
Graphite
b)
Carbon
c)
Glass
d)
Mica
116.

Half-adders have a major limitation in that they cannot __________

a)

Accept a carry bit from a present stage

b)

Accept a carry bit from a next stage

c)

Accept a carry bit from a previous stage

117.

In the breakdown region, a zener diode behaves like a …………… source.

a)

Constant voltage

b)

Constant Resistance

c)

Constant Current

118.

Iron losses includes

a)

armature loss and series winding loss

b)

hysterisis and eddy current loss

c)

windage and bearing loss

d)

none

119.

wave wound is used in_________

a)

high current, low voltage

b)

high voltage, low current

c)

only medium voltage

d)

medium current

120.

Decimal equivalent of  (1100)2\left(1100\right)_2  

a)

10

b)

12

c)

8

121.

A zener diode is always ………… connected.

a)

Forward

b)

Reverse

c)

Either reverse or forward

122.

___________is provided between commutator segments in commutator

a)

insulation mica sheet

b)

coil

c)

Space

d)

nothin is provided

123.

What is electrical current?

a)

A unit of electric current equal to a flow of one coulomb per second.

b)

The SI derived unit of electrical resistance, named after German physicist George Simon Ohm.

c)

The rate of flow of electric charge past a point or region.

124.

The function of commutator is_____

a)

rectification

b)

amplification

c)

to get ac current

d)

receive current

125.

Equation for generated e.m.f is_____

a)

Eg = PφZN/60A

b)

Eg = PφZ/60A

c)

Eg = PφZN/60

d)

Eg = PφN/60A

126.

opern circuit characteristics is the relation between

a)

emf on load (E) and Armature current(Ia)

b)

emf at no load(E0) and field current(If)

c)

Terminal voltage (V) and load current(IL)

d)

none

127.

How many electrons are there in the outer most shell of Silicon

a)

5

b)

4

c)

3

d)

8

128.
What is the number value for green in the color code chart?
a)
6
b)
4
c)
2
d)
5
129.

Which circuit will light up the bulbs?

a)
b)
c)
d)
130.

How many outputs are required for the implementation of a subtractor?

a)

1

b)

3

c)

2

131.

The diffused impurities with ________ valence electrons are called donor atoms.

a)

4

b)

3

c)

5

d)

0

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