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Basic Electronics MFP

Total questions: 150

Worksheet time: 1hrs 15mins

Name
Class
Date
1.

The unit of charge is _________

a)

Voltage

b)

Ampere

c)

Coulombs

2.

The resistance of a uniform Conductor is directly proportional to the ________of the conductor

a)

Length

b)

Cross Sectional Area

c)

Conductivity

3.

In a material where the resistance INCREASES with an increase in temperature, the material is said to have a ____________

a)

Neutral Temperature Coefficient

b)

Positive Temperature Coefficient

c)

Negative Temperature Coefficient

4.

________ is the capacity of energy

a)

Current

b)

Voltage

c)

Power

5.

You are given a resistor whose stripes are colored from left to right as orange, orange, brown, silver. Find the resistance value.

a)

330 Ohms

b)

33KOhms

c)

3.3 Mega Ohms

6.

What is this ?

a)

Fixed Resistor

b)

Resistor

c)

Variable Resistor

7.

If the volatge is 20V and the current flowing through the circuit is 2 mA . What is the resistance?

a)

100 Ohms

b)

1 K Ohms

c)

10k Ohms

8.

Look at this & say What type of source

a)

Current Source

b)

Voltage Source

c)

Independent Source

9.

What is the Name of this source?

a)

Current Source

b)

Resistive Source

c)

Voltage Source

10.

___________is the central part of an atom.

a)

Protons

b)

Neutrons

c)

Nucleus

11.

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

12.

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

13.

These are the characteristics of Trivalent impurities except

a)

•3 valence electrons

b)

•produce p-type semiconductors

c)

•producing a "hole".

d)

Antimony, arsenic, and phosphorus are the examples

14.

The characteristics of p-type semiconductors is includes

a)

Majority carriers are electron

b)

Has tendency to gain electron

c)

Has tendency to donor electron

d)

Easy to conduct electricity

15.

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

a)

Quartz

b)

Silicon

c)

Diamond

d)

Tantalum

16.

Name this electronic component

a)
Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Transistor
17.

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

18.

The potential difference created across the P-N junction due to the diffusion of electrons and holes is called___________

a)

potential barrier

b)

back emf

c)

instantaneous speed

19.

what is a diodes function

a)

allows current to flow in one direction

b)

allows current to flow in two directions

c)

is a resistor

20.

when a 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

21.

Which component of a circuit is used to measure current?

a)
b)
c)
d)
22.

The number of diodes used to build a bridge rectifier

a)

1

b)

2

c)

3

d)

4

23.

Efficiency of a centre tapped full wave rectifier is _________

a) 50%

b) 46%

c) 70%

d) 81.2%

a)

50%

b)

46%

c)

70%

d)

81.2%

24.

The two legs of the diode are ________________ and _______________

(a)  

25.

Which image shows the output of a sine-wave after it has gone through a diode? (Half-wave rectified)

a)
b)
c)
d)
26.

In a forward bias condition, further increase in the external applied voltage will increase the size of the depletion region.

a)

True

b)

False

27.

In a forward bias condition, when the applied voltage is more than the potential barrier of this PN junction the resistance that is offered by the depletion region negligible.

a)

True

b)

False

28.

In a reverse bias condition, the depletion region offers more resistance to these majority carriers.

a)

True

b)

False

29.

Addition of pentavalent impurity to a semiconductor creates _____.

a)

Free Electrons

b)

Holes

c)

Valence Electrons

d)

Valence Ion

30.

The forward voltage drop across a germanium diode is (a)   .

31.

Diode that is always connected in reverse bias condition.

(a)  

32.

A zener diode has ______ pn junction/s.

a)

One

b)

Two

c)

Three

d)

None

33.

When a PN junction is connected to any external bias, it is considered in thermal equilibrium condition.

a)

True

b)

False

34.

Which of the following is symbol of capacitor ?

a)
b)
c)
d)
35.

Which of the following is the unit of inductance?

a)

Ohm

b)

Henry

c)

Ampere turns

d)

Webers/meter

36.
------------------------ is created out of two metal plates and an insulating material called a dielectric.
a)
An inductor
b)
A capacitor
c)
A fixed resistor
d)
A variable resistor
37.

What are the 3 legs of a transistor called?

a)

Base, Electrode, Commiter

b)

Bridge, Collector, Extruder

c)

Base, Collector, Emitter

d)

Brake, Collection, Emit

38.

A transistor is essentially what?

a)

An output device

b)

An electronic switch

c)

A deivce that limits the flow of power

39.

The shorter leg of an LED is what?

a)

Positive

b)

Negative

40.

a zener diode is used as

a)

an amplifier

b)

a rectifier

c)

a voltage regulator

41.

the picture is for

a)

full wave rectifier bridge

b)

half wave rectifier

c)

switching circuit

42.
a)

halfwave rectified

b)

fullwave rectified

c)

sine wave

d)

light bulb

43.

What electrical component is used to smooth half wave current signals?

a)

Resistor

b)

Diode

c)

Capacitor

d)

Voltage regulator

44.

Which image shows the output of a sine-wave after it has gone through a diode? (Half-wave rectified)

a)
b)
c)
d)
45.

what is a diodes function

a)

allows current to flow in one direction

b)

allows current to flow in two directions

c)

is a resistor

46.

What is the function of a transistor?

a)

Amplify signals

b)

Regulate voltage

c)

Store charge

47.

What is the unit of frequency?

a)

Watt

b)

Hertz

c)

Ohm

48.

What is the purpose of a capacitor in an electronic circuit?

a)

Store energy

b)

Control current flow

c)

Generate heat

49.

The Maximum Efficiency of half wave rectifier is

a)

20.4

b)

40.6

c)

81.2

d)

10

50.

The maximum amount of reverse voltage which can be applied on a diode before breakdown is reached

a)

Zener Voltage

b)

Peak Inverse Voltage

c)

Breakdown Voltage

d)

Threshold Voltage

51.

In a forward bias condition, when the applied voltage is more than the potential barrier of this PN junction the resistance that is offered by the depletion region negligible.

a)

True

b)

False

52.

In a reverse bias condition, the depletion region offers more resistance to the majority carriers.

a)

True

b)

False

53.

A transistor has …………………

a)

one pn junction

b)

two pn junctions

c)

three pn junctions

d)

four pn junctions

54.

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

a)

HEAVILY

b)

MODERATELY

c)

LIGHTLY

d)

NONE OF THE ABOVE

55.

A transistor is a …………… operated device

a)

CURRENT

b)

VOLTAGE

c)

BOTH CURRENT AND VOLTAGE

d)

NONE

56.

The Direction of the arrow represents the direction of ___________ when the diode is forward bias

a)

N Type material

b)

P type material

c)

PN Junction

d)

conventional current flow

57.

At what voltage the diode can conduct for silicon material

(a)  

58.

The minimum number of diode required for center tap full wave rectifier

a)

1

b)

4

c)

2

d)

3

59.

The circuit which is used for converting the weak signal to strong signal

a)

Rectifier

b)

Amplifier

c)

Oscillator

d)

Clamper

60.

Which among the following is a passive electronic component

a)

Resistor

b)

Capacitor

c)

Inductor

d)

All of these

61.

Which among the following is not an example for active electronic component?

a)

Diode

b)

BJT

c)

Inductor

d)

FET

62.

The components which are capable of processing / working (amplifying, Oscillating, Clamping, Clipping & etc…) on an electrical signal independently are called -------------------

(a)  

63.

In colour coding of resistors, the RED colour corresponds to the digit---------------

a)

1

b)

2

c)

3

d)

4

64.

Potentiometer, Rheostat, Trimmer or Preset etc means --------------------resistors

(a)  

65.

Diode has

a)

2 layer 2 junction

b)

2 layer 1 junction

c)

1 layer 1 junction

d)

1 layer no junction

66.

PN Diode is a uni directional device

a)

True

b)

False

67.

AC to DC Conversion is called

a)

Chopper

b)

Inverter

c)

Rectifier

d)

Cycloconverter

68.

Half wave rectifier has 2 diodes

a)

True

b)

False

69.

Full wave rectifier conducts in both half cycles

a)

True

b)

False

70.

What is the frequency of a square waveform if the period of that waveform is 1.25microsec?

a)

8 kHz

b)

0.8 kHz

c)

0.8 MHz

71.

Which resistive component is designed to be temperature sensitive?

a)

Thermistor

b)

Rheostat

c)

Potentiometer

d)

Photoconductive cell

72.

When parallel resistors are of three different values, which has the greatest power loss?

a)

The smallest resistance

b)

The largest resistance

c)

They have the same power loss.

d)

Voltage and resistance values are needed.

73.

The variation of a quantity such as voltage or current shown on a graph is known as ___________

a)

Waveform

b)

Peak value

c)

Instantaneous value

d)

Period

74.

What is the duration of one cycle known as _________

a)

Waveform

b)

Peak value

c)

Instantaneous value

d)

Period

75.

The repetition of a variable quantity, recurring at equal intervals, is known as ___________

a)

Waveform

b)

Instantaneous value

c)

Cycle

d)

Period

76.

The value of a given waveform at any instant time is termed as ___________

a)

Waveform

b)

Instantaneous value

c)

Cycle

d)

Period

77.

The maximum instantaneous value measured from zero value is known as?

a)

Peak value

b)

Peak to peak value

c)

Cycle

d)

Period

78.

If the volatge is 20V and the current flowing through the circuit is 2 mA . What is the resistance?

a)

100 Ohms

b)

1 K Ohms

c)

10k Ohms

79.

The ratio of maximum to minimum resistance that can be obtained with N number of

3ohm resistors is

a)

N

b)

NxN

c)

NxNxN

d)

NxNxNxN

80.



(a)  

81.

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

a)

kA

b)

mA

c)

uA

d)

A

82.

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

a)

Constant voltage

b)

Constant Resistance

c)

Constant Current

83.

The ripple factor of a half-wave rectifier is …………………

a)

0.48

b)

1.21

c)

2

d)

2.5

84.

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

85.

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

86.

In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are

a)

Majority Carriers

b)

Minority Carriers

c)

Both of the above

d)

Fixed Donor and Acceptor ions

87.

The capacitance of a reverse biased PN junction

a)

Increases as reverse bias is increased

b)

Decreases as reverse bias is decreased

c)

Increases as reverse bias is decreased

d)

Is insignificantly low

88.

When a diode is forward biased, the voltage across it

a)

is inversely proportional to the current

b)

is directly proportional to the current

c)

remains approximately the same

d)

is directly proportional to the source voltage

89.

What are the 3 legs of a transistor called?

a)

Base, Electrode, Commiter

b)

Bridge, Collector, Extruder

c)

Base, Collector, Emitter

d)

Brake, Collection, Emit

90.

Which terminal was heavily dopped....?

a)

Emitter

b)

Base

c)

Collector

d)

None of the above

91.

transistor has 3 electrodes namely

a)

PNP

b)

NPN

c)

Base/ Collector/ Emitter

d)

Drain/ Gate/ Source

92.

In a NPN Transistor, the current carriers are ………….

a)

Acceptor Ions

b)

Donor Ions

c)

Free Electrons

d)

Holes

93.

In a Transistor ………………..

a)

IE = IC + IB

b)

IC = IE + IB

c)

IE = IC – IB

d)

IB = IC + IE

94.

The arrow in the symbol of a transistor indicates the direction of ------

(a)  

95.

The number of depletion layer in transistor are

a)

two

b)

three

c)

zero

d)

none

96.

Of the three regions,Emitter,Base,collector in a transistor which has the biggest size

a)

collector

b)

Base

c)

Emitter

97.

In PNP transistor the majority carriers are

a)

Holes

b)

Electrons

c)

none

98.

In NPN transistor _____________are minority carriers

a)

holes

b)

electrons

c)

atoms

d)

molecules

99.

α of a transistor is -------

a)

0.9 to 0.998

b)

1

c)

less than unity

d)

>1

100.

In a transistor,if β=100 and collector current IC =10mA then emitter current IE is -----

a)

10.1 mA

b)

12 mA

c)

9 mA

d)

2mA

101.

Relationship between α and β is β =

a)

α1−α\frac{\alpha}{1-\alpha}

b)

β1+β\frac{\beta}{1+\beta}

c)

β\beta

d)

α\alpha

102.

If the value of α is 0.9,then value of β is -----

a)

9

b)

90

c)

50

d)

500

103.
Name this electrical component
a)
Electrolytic Capacitor
b)
Fixed Resistor
c)
Ceramic Disc Capacitor
d)
Diode
104.

A resistor's first three colour bands are brown, black, and red. What is its value?

a)

10 ohms

b)

10 Kohms

c)

200 ohms

d)

1000 ohms

105.

A 47 Kohm resistor would have which colours on its first three bands?

a)

yellow, violet, white

b)

red, white, blue

c)

yellow, violet, orange

d)

orange, yellow, violet

106.

The total current through this circuit is

a)

0.02 amps

b)

0.09 amps

c)

50 amps

d)

9 amps

107.

As the resistance of a circuit increases, the current will...

a)

increase

b)

decrease

c)

stay the same

108.
Comparing series vs parallel circuits:
a)
Series: voltage changes, current is constant
b)
Series: Current changes, voltage is constant
c)
Parallel: both voltage AND current change
d)
Parallel: neither voltage nor current change
109.

What is the purpose of a resistor?

a)

allow current flow

b)

control current flow

c)

prevent current flow

d)

allow heat to build up

110.
What are rheostats used for?
a)
Control large amounts of heat
b)
Vary large amounts of current
c)
Control of a circuit's power rating
d)
Vary a circuit's tolerance
111.

Four resistors in series 5ohms, 10ohms, 5ohms, 20ohms

Total resistance is -

a)

5 ohms

b)

30 ohms

c)

40 ohms

d)

50 ohms

112.

Resistors in parallel, 5ohms, 5ohms, 5ohms

total resistance is

a)

5 + 5 + 5 = 15 ohms

b)

1/5 + 1/5 + 1/5 = 3/5 ohms

c)

1/5 + 1/5 + 1/5 = 3/5 flipped = 5/3 ohms

d)

1/5 + 1/5 + 1/5 = 3/15 ohms

113.

2 resistors in parallel 4ohms and 8ohms, the total resistance will be

a)

less than 4ohms

b)

more than 4ohms

c)

more than 8ohms

d)

less than 1ohm

114.

what is the total resistance of the circuit above?

a)

8ohms

b)

9ohms

c)

4ohms

d)

2ohms

115.

what is the total resistance of this circuit?

a)

5.5 ohms

b)

6.5 ohms

c)

2.5 ohms

d)

4.5 ohms

116.

If a circuit has 10 ohms resistance and 100 volts, what will the current be?

a)

10 amps

b)

100 amps

c)

1000 amps

d)

1 amp

117.

If a circuit has 200 volts and total resistance is 20 ohms, what will the current be?

a)

20 amps

b)

30 amps

c)

10 amps

d)

50 amps

118.

RT = ?

a)

4.8 ohms

b)

6.5 ohms

c)

15 ohms

d)

25 ohms

119.
2.2KΩ can be rewritten as _____ Ω.
a)
220
b)
22
c)
2200
d)
22000
120.
Metal Film resistor is the example of _______ type resistor.
a)
Fixed
b)
Variable
c)
Both
d)
None of the Above
121.

Identify which type of capacitor is shown in the figure?

a)

Mica

b)

Ceramic

c)

Paper

d)

Electrolyte

122.

The resultant capacitance between and in the following figure is equal to

a)

1 μ\mu F

b)

3 μ\mu F

c)

2 m F

d)

1.5 m F

123.

During charging a capacitor variation of potential V of the capacitor with time t is shown as

a)
b)
c)
d)
124.

Tick the correct option/options

a)

Equivalent capacitance in series combination is least among all capacitors

b)

Equivalent capacitance in series combination is greatest among all capacitors

c)

Charge on capacitor plates changes when dielectric is inserted between the plates

d)

Capacitance of a capacitor does not depends on charge

125.

Capacitor blocks__________ after long time.

a)

alternating current

b)

direct current

c)

both alternating and direct current

d)

neither alternating nor direct current

126.

What is the value of capacitance of a capacitor which has a voltage of 4V and has 16C of charge?

a)

2F

b)

4F

c)

6F

d)

8F

127.

The capacitance between two plates increases with


a)

Shorter plate area and higher applied voltage

b)

Shorter plate area and shorter distance between them

c)

Larger plate area, longer distance between plates and higher applied voltage

d)

Larger plate area and shorter distance between plates

128.

The capacitance C is charged through a resistor R. The time constant of the charging circuit is given by


a)

C/R

b)

1/RC

c)

RC

d)

R/C

129.

The capacitance of 1 μF equals


a)

10 -12 F

b)

10-8 F

c)

10-6 F

d)

10-4 F

130.

Unit of capacitance is___________

a)

Volts

b)

Farad

c)

Henry

d)

Newton

131.

What is capacitance?

a)

The ability of a capacitor to store energy.

b)

The ability of a capacitor to resist current flow.

c)

The ability of a capacitor to generate a magnetic field.

132.

What is the dielectric material used in capacitors?

a)

Insulating material that separates two metal plates.

b)

Conductive material that connects two metal plates.

c)

Magnetic material that stores energy.

133.

What is the difference between a fixed capacitor and a variable capacitor?

a)

A fixed capacitor has a fixed value of capacitance while a variable capacitor can vary its capacitance.

b)

A fixed capacitor can block DC current while a variable capacitor cannot.

c)

A fixed capacitor has a smaller capacitance compared to a variable capacitor.

134.

What is the capacitance number code used on small capacitors?

a)

The first two numbers indicate the capacitance value and the third number indicates the number of zeros.

b)

The first two numbers indicate the voltage rating and the third number indicates the capacitance value.

c)

The first two numbers indicate the tolerance and the third number indicates the capacitance value.

135.

What happens when capacitors are connected in series?

a)

The total capacitance decreases.

b)

The total capacitance increases.

c)

The total capacitance remains the same.

136.

When capacitors is arrange in series (3 capacitors), the equivalent capacitance C is

a)

C = C1 + C2 + C3

b)

1/C = 1/C1 + 1/C2 + 1/C3

c)

C = QV1 + QV2 + QV3

d)

C = CR1 + CR2 + CR3

137.

If 4μF and 2μF capacitors are conneced in series, the equivalent capacitor is ___________.

a)

1.33μF

b)

0.75μF

c)

6μF

d)

2μF

138.

If capacitors are connected in parallel, then potential difference across each capacitor is

a)

same

b)

zero

c)

different

d)

infinite

139.

When a 4 V battery is connected to a capacitor, what is the voltage across the capacitor after a long period of time?

a)

0.0 V

b)

2.0 V

c)

4.0 V

d)

3.0 V

140.

In the circuit, what is the output voltage?

a)

a) 50 V

b)

b) 70 V

c)

c) 120 V

d)

d) 170 V

141.

Zener diodes are also known as

a)

a) Voltage regulators

b)

b) Forward bias diode

c)

c) Breakdown diode

d)

d) None of the mentioned

142.

Which of the following is true about the resistance of a Zener diode?

a)

a) It has an incremental resistance

b)

b) It has dynamic resistance

c)

c) The value of the resistance is the inverse of the slope of the i-v characteristics of the Zener diode

d)

d) All of the mentioned

143.

Which of the following is the correct symbol for the zener diode?

a)
b)
c)
d)
144.

The depletion region of the Zener diode is ____________

a)

a) Thick

b)

b) Normal

c)

c) Very Thin

d)

d) Very thick

145.

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

a)

constant voltage

b)

constant current

c)

constant resistance

d)

none of the above

146.

The colour of emitted light from LED depends on

a)

physical dimensions of LED

b)

Number of available carriers

c)

Type of semiconductor material used

d)

Number of recombinations taking place

147.

The advantage of LED is

a)

Low operating voltage

b)

Long Life

c)

Small in Size

d)

All the above

148.

Identify

a)

Potentiometer

b)

Tangent galvanometer

c)

Ammeter

d)

multimeter

149.

Identify

a)

LED

b)

Transistor

c)

IC

d)

Diode

150.

The electronic component used in the process of rectification is...

a)

Capacitor

b)

Diode

c)

Transistor

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