EASY PSC | 010/2022 - Technician Grade II (Electronics) Answer Key

Question 1

What is the shape of warning sign board?

A

Hexagonal

B

Square

C

Circular

D

Triangular

Question 2

The classification of fire which involves metals are called :

A

Class B

B

Class A

C

Class D

D

Class C

Question 3

Blanketing the fire with foam, sand etc. for stopping the supply of oxygen is called :

A

Cooling

B

Smothering

C

Blanketing

D

Starving the fire

Question 4

The factors required of combustion are :

A

Fuel and heat

B

Heat and oxygen

C

Fuel and oxygen

D

Fuel, heat and oxygen

Question 5

Which of the following is used to form curves /loops in wires?

A

Side cutting pliers

B

End cutting pliers

C

Round nose pliers

D

Flat nose pliers

Question 6

Which of the following tool is used to hold light weight and very small components and very thin wires/strands?

A

Diagonal plier

B

Tweezers

C

Scriber

D

Try square

Question 7

The material which have 4 valence electrons are called :

A

Non-metal

B

Semi conductor

C

Metal

D

None of the above

Question 8

Insulators are also called?

A

Thyristors

B

Semi conductors

C

Molecules

D

Dielectrics

Question 9

If the frequency of a sine wave is increased, then its wavelength will :

A

Unchanged

B

Increase

C

Decrease

D

None of the above

Question 10

An AC voltmeter will display :

A

RMS voltage

B

Average voltage

C

Peak voltage

D

Peak-to Peak voltage

Question 11

Which is the name of the motion of charged particles in any medium?

A

Frequency

B

Voltage

C

Resistance

D

Current

Question 12

The electrical property opposes the flow of electrons is called :

A

Power

B

Voltage

C

Resistance

D

Current

Question 13

Single strand wires are also known as :

A

Hook-Up wire

B

Multi strand wire

C

Flexible wire

D

Twisted wire

Question 14

The purpose of SWG is :

A

Measure current

B

Measure voltage

C

Measure diameter of wire

D

Measure insulation of wire

Question 15

A multimeter is used to measure :

A

Resistance

B

Current

C

Voltage

D

All of the above

Question 16

An ammeter is connected in –––––––––––with a circuit to measure current :

A

Series

B

Parallel

C

Series or parallel

D

None of the above

Question 17

The correction of mechanical zero error of panel meter is done :

A

By replacing moving coil

B

By replacing pointer

C

Keeping the meter in vertical position

D

By adjusting the screw

Question 18

A galvanometer can be converted into voltmeter by connecting a ––––––––––– with it :

A

High resistance in series

B

Low resistance in parallel

C

Battery in series

D

Variable resistance in series

Question 19

Generally batteries can be mainly classified into two categories, namely

A

Cylindrical cells and rectangular cells

B

Primary cells and secondary cells

C

Dry cells and alkaline cells

D

Button cells and lithium cells

Question 20

The electrolyte used in lead acid cell is :

A

Alkaline solution

B

Sulphuric acid

C

Zinc chloride

D

Hydrochloric acid

Question 21

The nominal voltage of a single cell in lead acid battery :

A

2.2 V

B

1.1 V

C

2.0 V

D

1.5 V

Question 22

Usually ––––––––––– is used to express the capacity of a battery :

A

Ampere Hour

B

KWH

C

Volt

D

None of the above

Question 23

What is the colour code of 1000 ohm resistor?

A

Black, Brown, Black

B

Brown, Brown, Brown

C

Brown, Black, Brown

D

Brown, Black, Red

Question 24

The amount of current flowing through a series connection or resistors :

A

Similar

B

Changes based on resistance value

C

Different

D

Stable

Question 25

When the current flowing through a 10K resistor is 5mA. The power is :

A

250 mW

B

200 mW

C

100 mW

D

None of the above

Question 26

Unit of mutual inductance is :

A

Henry

B

Ohm

C

Ampere

D

Volts

Question 27

The component which opposes any change in current is :

A

Inductor

B

Capacitor

C

Resistor

D

Diode

Question 28

––––––––––– is a polarised capacitor.

A

Plastic film capacitor

B

Paper capacitor

C

Ceramic capacitor

D

Tantalum electrolytic capacitor

Question 29

How electrical energy is stored in a capacitor?

A

As magnetic field

B

As electrostatic field

C

As chemical form

D

All the above

Question 30

The ability of material to retain its magnetism is called :

A

Retentivity

B

Residual magnetism

C

Resistivity

D

None of the above

Question 31

The capacitive reactance is ––––––––––– when the frequency is increased :

A

Infinity

B

Decreased

C

Increased

D

Same

Question 32

The winding of a transformer to which electrical energy is applied is known as :

A

Main winding

B

Auxillary winding

C

Primary winding

D

Secondary winding

Question 33

Which impurity is added to pure semiconductor to form N-type material?

A

Boron

B

Indium

C

Arsenic

D

Gallium

Question 34

What is the output pulse frequency of the full wave rectifier with input frequency of 50 Hz?

A

40 Hz

B

60 Hz

C

100 Hz

D

200 Hz

Question 35

What is the name of the process of converting AC into DC voltage?

A

Inverting

B

Rectifying

C

Amplifying

D

Demodulating

Question 36

Forbidden energy gap at 0°K for Si and Ge respectively are :

A

0.5 eV and 0.7 eV

B

1 eV and 0.6 eV

C

1.21 eV and 0.785 eV

D

0.72 eV and 0.785 eV

Question 37

Which of the following will serve as a donor impurity in silicon?

A

Boron

B

Indium

C

Germanium

D

Antimony

Question 38

The temperature coefficient of an intrinsic semiconductor is :

A

Negative

B

Positive

C

Like that of Metals

D

Zero

Question 39

Current flow in a semiconductor depends on the phenomenon of :

A

Drift

B

Diffusion

C

Recombination

D

All of the Above

Question 40

Rectification efficiency of a full wave bridge rectifier will be :

A

40.6%

B

81.2%

C

95.8%

D

60.8%

Question 41

What is the meaning of first letter indicated in the transistor code number BC 107?

A

Germanium material used

B

Antimony material used

C

Silicon material used

D

Indium material used

Question 42

When a reverse bias is applied to PN junction the width of the depletion layer?

A

Remains Same

B

Is Increased

C

Is Decreased

D

May Increase or Decrease

Question 43

Which of the following diode operated in reverse bias mode?

A

P_N junction

B

Schottky

C

Tunnel

D

Zener

Question 44

Which configuration of transistor amplifier is most commonly used in electronic circuits?

A

Common base configuration

B

Common emitter configuration

C

Common collector configuration

D

Common drain amplifier configuration

Question 45

How the negative feedback is called?

A

Degenerative feedback

B

Regenerative feedback

C

Current controlled feedback

D

Voltage controlled feedback

Question 46

What type of packaging is generally used to transistors utilized for low power amplification?

A

Metal packaging

B

Plastic packaging

C

Ceramic packaging

D

Plastic packaging with metal heat sinks

Question 47

Which class of amplifier will give less distortion for input signals?

A

Class – A

B

Class – B

C

Class – AB

D

Class – C

Question 48

What is the function of pin number 4 of the IC 555?

A

Set

B

Reset

C

Control voltage

D

Threshold

Question 49

The medium doped region in a transistor is :

A

Collector

B

Base

C

Emitter

D

Gate

Question 50

A common collector amplifier has the highest :

A

Voltage Gain

B

Output Impedance

C

Power Gain

D

Current Gain

Question 51

The lowest input resistance is obtained in which transistor configuration :

A

Common Collector

B

Common source

C

Common Base

D

Common Emitter

Question 52

Transistor is a :

A

current controlled voltage device

B

current controlled current device

C

voltage controlled voltage device

D

voltage controlled current device

Question 53

A relaxation oscillator is one which :

A

produces sinusoidal output

B

no signal output

C

relaxes indefinitely

D

produce non sinusoidal output

Question 54

Ideal value of Common Mode Rejection Ratio in OP-Amp is :

A

unity

B

zero

C

infinity

D

0.50

Question 55

What is the closed loop voltage gain of a inverting OP-amp circuit when feedback resistor value is 10KΩ and input resistor value is 1KΩ ?

A

10

B

–10

C

1

D

11 A

Question 56

Which Multivibrator can be used for storing digital data?

A

Astable Multivibrator

B

Mono Stable Multivibrator

C

Bistable Multivibrator

D

None of these

Question 57

Which is the output pin number LM 741 OP_AMP?

A

Pin number 6

B

Pin number 4

C

Pin number 5

D

Pin number 3

Question 58

When a transistor work as an amplifier its operation is in :

A

Cut Off Region

B

Active Region

C

Saturation Region

D

Inverted Region

Question 59

How many Op-Amps are fabricated inside the LM 324 IC pack?

A

Two Op-Amps

B

Three Op-Amps

C

Four Op-Amps

D

Five Op-Amps

Question 60

Bistable Multivibrator has :

A

One Stable State

B

Two Stable State

C

Three Stable States

D

Two Quasi Stable States

Question 61

Which sensor detect the presence of object without any physical contact?

A

Load cell

B

Proximity Sensor

C

Thermo Couple

D

LVDT

Question 62

Which one of the following is used for measuring torque ?

A

Strain gauge

B

RTD

C

Load cell

D

Wheat Stone Bridge

Question 63

What is the maximum forward gate current for BFW 10 FET?

A

4 mA

B

12 MA

C

10 mA

D

20 mA

Question 64

The input impedance of IGBT is :

A

Medium

B

Low

C

Infinity

D

High

Question 65

In UJT when the temperature increases the intrinsic stand of ratio is :

A

Remains the same

B

Decreases

C

Increases

D

None of these

Question 66

Which sensor can be used to stop the flow of a liquid into a pipe by means of an electric current?

A

Load cell

B

Solenoid valve

C

Water level sensor

D

Switch

Question 67

The desirable change over period for a UPS is :

A

10 ms

B

5 ms

C

1 micro second

D

1 ms

Question 68

Which type of PV cell has the highest efficiency?

A

Hybrid

B

Amorphous Silicon

C

Polycrystalline silicon

D

Mono Crystalline Silicon

Question 69

Which technique is achieved by switching of the choppers in battery charging circuit?

A

Constant current

B

Constant frequency

C

Constant Voltage

D

Constant Power

Question 70

Which sensor is suitable for process temperature measurement of steel?

A

Thermister

B

strain gauge

C

Thermocouple

D

Capacitive transducer

Question 71

Which material is coated as a thin layer on the PV cells to reduce surface reflection?

A

Gallium Indium Nitride

B

Gallium Phosphide

C

Silicon monoxide

D

Silicon dioxide

Question 72

A

(A)

B

(B)

C

(C)

D

(D)

Question 73

Which one of these ICs used as a Demultiplexer?

A

IC 74LS138

B

IC 74LS83

C

IC 74LS86

D

IC 74LS92

Question 74

Which memory device is a volatile memory?

A

RAM

B

ROM

C

Hard Disk

D

CD

Question 75

Which one of the following is a search engine?

A

Hot mail

B

WWW

C

outlook

D

Bing

Question 76

Which protocol is used for transferring the file from one machine to another?

A

HTTP

B

FTP

C

TCP

D

IP

Question 77

Which decimal number is equivalent to binary number 11110?

A

20

B

12

C

30

D

16

Question 78

A hard disk is divided into tracks, which are further subdivided into :

A

Clusters

B

Sectors

C

Vectors

D

None of these

Question 79

In ink jet Printers the droplets of ink are deflected by :

A

Electrically charge plates

B

Multi directional nozzle

C

High Pressure jets

D

None of these

Question 80

The effect due to which a semi conductor converts sunlight into emf is called :

A

Photo resistive effect

B

Seebeck effect

C

Photo voltaic effect

D

Hall’s effect

Question 81

How many connecting pins are there of USB (Universal Serial Bus) port?

A

2

B

3

C

4

D

5

Question 82

Which port is used to connect the HDD on the mother board?

A

IDE port

B

Com 1 port

C

Com 2 port

D

Floppy drive port

Question 83

The process of converting an analog signal into a sequence of samples that are uniformly spaced is called :

A

Quantization

B

Sampling

C

Encoding

D

Modulation

Question 84

How many I/O ports are there in Microcontroller 8051?

A

2

B

3

C

4

D

6

Question 85

What is the range of frequency for medium wave band?

A

550 KHz to 650 KHz

B

3 MHz to 30 MHz

C

30 MHz to 100 MHz

D

200 MHz to 300 MHz

Question 86

Which type of antenna is used for point to point communication of radio waves?

A

Yagi antenna

B

Dipole antenna

C

Omnidirectional antenna

D

Parabolic antenna

Question 87

Which pin is marked as the master reset (RST) function in microcontroller IC 8051?

A

Pin No : 9

B

Pin No : 20

C

Pin No : 30

D

Pin No : 40

Question 88

Which of given device used in speed control of a DC motor?

A

UJT

B

Transistor

C

FET

D

SCR

Question 89

Which of the given logic family provide minimum power dissipation?

A

ECL

B

RTL

C

TTL

D

CMOS

Question 90

One Kilo byte is equal to ––––––––––– bytes :

A

1024

B

64

C

256

D

32

Question 91

The internal RAM memory of 8051 micro controller is :

A

256 bytes

B

256 Bits

C

128 bytes

D

64 Bytes

Question 92

How many instructions are available in the micro controller family instruction set?

A

23

B

37

C

95

D

111

Question 93

Register that is used to hold the memory address of the next instruction to be executed is:

A

Instruction decoder

B

Control unit

C

Program Counter

D

Program Memory

Question 94

In which of the following modes of propagation the ionosphere acts as the reflecting surface of the waves :

A

Ground wave

B

Sky wave

C

Space Wave

D

Direct wave

Question 95

In an AM wave useful power is carried by :

A

Carrier

B

Side bands

C

Both side bands and carrier

D

None of these

Question 96

A K map (Karnaugh) is an abstract form of which diagram organized as a square matrix :

A

Block diagram

B

Cycle diagram

C

Venn diagram

D

Square diagram

Question 97

Which device convert a physical quantity into electrical quantity?

A

Oscillator

B

modulator

C

Amplifier

D

Transducer

Question 98

A binary decoder with four inputs will have :

A

16 outputs

B

12 outputs

C

8 outputs

D

4 outputs

Question 99

A microprocessor is a programmable logic device, 8085 microprocessor has :

A

16 address lines

B

8 address lines

C

4 address lines

D

2 address lines

Question 100

In how many different modes a universal shift register operates :

A

4

B

5

C

3

D

1

010/2022 - Technician Grade II (Electronics) - Kerala Co-operative Milk Marketing Federation Ltd