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Basic Electrical & Electronics-Revision 2

Total questions: 100

Worksheet time: 53mins

Name
Class
Date
1.

DC stands for ----------------------------

a)

direct control

b)

division control

c)

division current

d)

direct current

2.

Yoke is made of -------------material.

a)

silicon steel

b)

carbon steel

c)

Cast iron or cast steel

d)

plastic

3.

DC Generator converts --------------------energy into ----------energy.

a)

mechanical, electrical

b)

electrical, mechanical

c)

kinetic, mechanical

d)

potential, electrical

4.

What it is?

a)

Armature

b)

Commutator

c)

Brush

d)

Magnet

5.

What is the main part shown in the picture?

a)

spring

b)

carbon brush

c)

copper brush

d)

copper lug

6.

What is Ohms Law ?

a)

V=IR

b)

R=VI

c)

I=VR

d)

R=EV

7.
What is this symbol?
a)
resistor
b)
switch
c)
battery
d)
bulb
8.

Is defined as a continuous flow of electrons.

a)

Resistance

b)

Electric Current

c)

Ohms

d)

Voltage

9.

Are the two kinds of current.

a)

Direct and alternating

b)

Direct and Passive

c)

Direct and Active

d)

Active and Passive

10.

LED is an acronym for?

a)

Light Entry Diode

b)

Light Emitting Diode

c)

Light Editing Dipole

d)

Light Eliminating Dipole

11.

The unit for inductance is ___________

a)

Ohm

b)

Henry

c)

Farad

d)

Ampere

12.

According to Kirchoff’s voltage law,

a)

The algebraic sum of all the e.m.f’s in the circuit is zero

b)

Algebraic sum all the voltage drops in the circuit is zero

c)

Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero

d)

All of these

13.

The S.I. unit of power is

a)

Henry

b)

Coulomb

c)

Watt

d)

Watt-hour

14.

Unit of Capacitance is---------------

a)

Ohm

b)

Farad

c)

Henry

d)

None of these

15.

What classification of material prevents the flow of electricity?

a)

Semiconductor

b)

Conductor

c)

Insulator

d)

Electronic Component

16.

Kirchhoff's current law is applicable to only

a)

Junction in a network

b)

Closed loops in a network

c)

Electric circuits

d)

Electronic circuits

17.

Kirchhoff's current law states that

a)

Net current flow at the junction is positive

b)

Algebraic sum of the currents meeting at the junction is zero

c)

No current can leave the junction without some current entering it

d)

Total sum of currents meeting at the junction is zero

18.

The primary function of a fuse is to

a)

Open the circuit

b)

Protect the appliance

c)

Protect the line

d)

Prevent excessive currents from flow through the circuit

19.

H.R.C. fuses has

a)

High rating of current

b)

High rupturing capacity

c)

High resistance capacity

d)

None of these

20.

This is the circuit symbol of a

a)

resistor

b)

battery

c)

fuse

d)

switch

e)

an earth wire

21.

A device that contains a thin strip of metal that melts easily if the current in the circuit is too high

a)

Fuse

b)

resistor

c)

earth wire

d)

battery

e)

diode

22.

The fuses protects the electrical circuits from ____________

a)

The water.

b)

The Over load current.

c)

The Electric shock

d)

The Overload and short circuit current.

23.

The fuse wire is enclosed in a transparent glass tube or bulb, and the whole unit is sealed off called ...?

a)

RE wirable fuse.

b)

MCB

c)

Cartridge Fuse.

d)

None of above.

24.

The current which is rapidlly increase in very short time called.......?

a)

Reverse current

b)

overload current.

c)

Earth fault current.

d)

Short circuit current

25.

Liquid crystal represents which one of the following state:

a)

Crystalline solid-state

b)

Amorphous solid state

c)

Liquid state

d)

Liquid crystal state

26.

By which properties, the orientation of molecules in a layer of liquid crystals can be changed?

a)

Magnetic field

b)

Electric field

c)

Electromagnetic field

d)

Gallois field

27.

Liquid Crystals possess the properties of

a)

Solids

b)

Liquids

c)

Both solids and liquids

28.

LED works only in ______ bias

a)

Forward

b)

Reverse

29.

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

30.

When forward biased, LED emits light because of

a)

Recombination of electrons with holes

b)

Light generated in breaking the covalent bonds

c)

Light produced by collisions

d)

None of the above

31.

A Temperature Sensor Measures:

a)

The Light (UV)

b)

The Pressure (Weight)

c)

The Temperature (Hot/Cold)

d)

Motion (Movement)

32.

What type of sensor would be used in this kettle?

a)

Light Sensor

b)

Temperature Sensor

c)

Infra-red sensor

d)

Pressure Sensor

33.

What is in the picture?

a)

Capacitor

b)

Resistor

c)

Diode

d)

Inductor

34.

What is in the picture?

a)

Fuse

b)

Switch

c)

Integrated Circuit

d)

Light Emitting Diodes (LED)

35.

MCB FULL FORM -

a)

MINIATURE CIRCUIT BREAKER

b)

MODEL CIRCUIT BREAKER

c)

MAXIMUM CIRCUIT BREAKER

36.

WHAT IS THE IMAGE SHOWN -

a)

ULTRA POWER BATTERY

b)

MCB

c)

FUSE

d)

CELL

37.

IMAGE SHOWN IS A ......

a)

MINIATURE CIRUIT BREAKER

b)

FUSE

c)

BIG SWITCH

d)

SWITCH FOR HIGH VOLTAGE

38.

The difference between a FUSE and Miniature Circuit Breaker (MCB) is that ....?

a)

Fuse can use many times but CB only once.

b)

Fuse only once and CB many times may used.

c)

Fuse and CB can use many number of times.

d)

All of mentioned.

39.

Earthing is necessary to give protection against

a)

Danger of electric shock

b)

Voltage fluctuation

c)

Overloading

d)

High temperature of the conductors

40.

Generally earthing is provided for

a)

a. Safety of equipment

b)

b. safety of operating person

c)

both a & b

d)

None of the above

41.

Earth electrode provides ___________

a)

high resistance

b)

medium resistance

c)

low resistance

d)

very high resistance

42.

Moisture content in the soil ____ the soil resistance

a)

increase

b)

decrease

43.

The objective of the earthing is

a)

to provide as low resistance possible to the ground

b)

to provide as high resistance possible to the ground

44.

If a transformer reduces voltage, it is called a....................... transformer.

a)

step left

b)

step right

c)

step up

d)

step down

45.

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

a)

primary

b)

secondary

c)

tertiary

46.

This picture is an example of a ________________.

a)

Motor

b)

Generator

c)

Step-up transformer

d)

Step-down transformer

47.

Transformer works on which of the following principle

a)

Lenz’s Law

b)

Ampere's Law

c)

Faraday's Law of Electromagenetic Induction

d)

Fleming's Law

48.

What is the meaning of transformer?

a)

Optimus Prime

b)

A device that transfers electrical energy from one circuit to another

c)

Autobots

d)

Megatron

49.

Transformer is always connected to ___________ supply.

a)

A.C.

b)

D.C.

50.

The rotating part of an AC motor?

a)

Armature

b)

Rotor

c)

Stator

d)

Winding

51.

An electric motor is a device used to convert (a)   energy into mechanical energy.

52.

The expansion form of RCCB

a)

Residual current circuit breaker

b)

Residual circuit current breaker

c)

Residual circuit control breaker

d)

Residual control current breaker

53.

ELCB is an abbreviation of

a)

electrolytic circuit breaker

b)

earth locking circuit breaker

c)

earth leakage circuit breaker

d)

electric leakage circuit breaker

54.

Symbol of LED

a)
b)
c)
d)

None of these

55.

Short leg of LED is

a)

Anode

b)

Cathode

c)

Emitter

d)

Collector

56.

The full form of LCD is ____________

a)

Liquid Crystalline Display

b)

Logical Crystal Display

c)

Logical Crystalline Display

d)

Liquid Crystal Display

57.

In 7 segment display, how many LEDs are used?

a)

7

b)

8

c)

9

d)

10

58.

An electrical motor changes electrical energy to ______________ energy

a)

Mechanical

b)

Chemical

c)

Physical

d)

Potential

59.
3-phase voltage supply given to ___________ of 3 phase Induction Motor
a)
Stator
b)
rotor
c)
Laminations
d)
None of the above
60.

3-phase induction motor is a self-starting machine

a)

True

b)

False

61.

Select the correct polarity for forward bias

a)
b)
c)
d)
62.

Anode is _________ Polarity in diodes

a)

Negative

b)

Positive

c)

Ground

d)

Hot Side

63.

Component that Convert AC to DC and allow current to flow in one Direction

a)

Capacitor

b)

Diode

c)

Inverter

d)

Resistor

64.

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

65.

A transistor is essentially what?

a)

An output device

b)

An electronic switch

c)

A deivce that limits the flow of power

66.

Transistors act like tiny "____________."

a)

Electron sources

b)

Switches

c)

Batteries

d)

Bees?

67.

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

68.

How many terminals are there in a transistor....?

a)

1

b)

2

c)

3

d)

4

69.

What is the correct name for this component?

a)

Transistor

b)

Resistor

c)

Thyristor

d)

Thermistor

70.

What is the correct name given to the metal legs that stick out of a IC?

a)

Pegs

b)

Points

c)

Parts

d)

Pins

71.

IC stands for what?

a)

Integrated Circuit

b)

Inbuilt Circuit

c)

In-line Circuit

d)

Indirect Circuit

72.

which material is used in I.C.s?

a)

A conductor

b)

An insulator

c)

A semiconductor

d)

Copper

73.

A JFET has three terminals, namely …………

a)

cathode, anode, grid

b)

emitter, base, collector

c)

source, gate, drain

d)

none of the above

74.

Why is electrical wiring usually made from copper?

a)

Because copper is shiny

b)

Because copper conducts electricity

c)

Because copper is not magnetic

d)

Because copper insulate electricity

75.

Wood is...

a)

conductor

b)

insulator

76.
These particles orbit around the nucleus of an atom.  What are they called?
a)
electrons
b)
protons
c)
neutrons
d)
photons
77.
Everything is made up of little tiny things called _____
a)
compounds
b)
molecules
c)
atoms
d)
solids
78.
From the diagram, which particles are indicated with the arrow?
a)
electrons and protons
b)
protons and neutrons
c)
electrons and neutrons
d)
photons and nucleons
79.
In the center of the atom is something called _____
a)
the kernel
b)
the cell
c)
the nucleus
d)
the focal point
80.
What are the names of the particles in the nucleus?
a)
protons and neutrons
b)
protons and electrons
c)
photons and neutrons
d)
nucleons and protons
81.

which subatomic particles have no charge (they are neutral)?

a)

protons

b)

neutrons

c)

electrons

82.

What is a subatomic particle with a positive charge?

a)

Proton

b)

Neutron

c)

Electron

83.

EMF is an abbreviation of

a)

Electromotive force

b)

Electric motive force

c)

Electrical motive force

d)

Both a and b

84.
In a series circuit, which of the following is the same throughout the circuit?
a)
Resistance
b)
Voltage
c)
Current
d)
Power
85.
Anything that has mass, weight and occupies space is called______.
a)
Compound.
b)
Matter
c)
Attraction.
d)
Element
86.

By convention, current is defined as flowing from ______________ to ______________.

a)

positive, negative

b)

positive, positive

c)

negative, positive

d)

negative, negative

87.
What type of circuit is pictured?
a)
series
b)
parallel
88.
What type of circuit is pictured?
a)
series
b)
Parallel
89.

How to you calculate the total resistance in a series circuit?

a)

R1 + R2+ R3

b)

R1 - R2 - R3

c)

1/R1 + 1/R2 + 1/R3

d)

R1 = R2 = R3

90.

How do you calculate total resistance in a parallel circuit?

a)

R1 + R2 + R3

b)

R1 - R2 - R3

c)

1/R1 +1/R2 + 1/R3 = 1/RT

d)

R1 = R2 = R3

91.

Current entering and leaving a point in a circuit should be

a)

equal

b)

decreasing

c)

increasing

d)

variable

92.

Which of the following motors is best described as powerful, accurate, small, easily programmable, and precise redundant motion?

a)

a. Electro-motors

b)

b. Magnetic motors

c)

c. Servo motors

d)

d. Stepper motors

93.

Servo motor works on _______________ mechanism.

a)

Servo

b)

castrol

c)

jumping

d)

open

94.

If motor used is AC powered, then it is ___________ servo motor.

a)

DC

b)

AC

c)

Diode

d)

ABC

95.

Servo motor is mainly used for ______________

a)

open loop

b)

less torque

c)

precision

d)

none of this

96.

Maintenance of induction motor can be scheduled as

a)

Daily

b)

Weekly

c)

Monthly

d)

All of this

97.

a)

Micrometer

b)

Pull-Push Rule

c)

Digital VOM

d)

Wire Gauge

98.

What is it? It's

a)

a crocodile clip

b)

screws

c)

a multimeter

d)

a clamp multimeter

99.

Whcich one is pliers?

a)
b)
c)
d)
100.

Which one is a capacitor?

a)
b)
c)
d)

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