KDRB Assistant Engineer (Electrical) PYQ Mock Test

Question 1

Which of the film won the National award for the best education film in 2021 ?

A

Jackal

B

Apples and Oranges

C

Wild Kamafaka

D

Marakkar Arabikadalinte Simham

Question 2

Which article in the Indian constitution is related to secularism ?

A

Article 51 (A)

B

Article 14

C

Article 25

D

Article 17

Question 3

Gandhiji's concept of Sarvodaya means :

A

Welfare for all

B

Brahmacharya

C

Ahimsa

D

Live peacefully

Question 4

The Lokpal Lokayutas Acts, 2013 came into effect from :

A

January - 26, 2014

B

December - 16, 2013

C

December - 26, 2013

D

January - 16, 2014

Question 5

Agasthiar falls is located in …………

A

Kalakkad

B

Coutralam

C

Kumararkovil

D

Papanasam

Question 6

Who is the current CEO of NITI Ayog ?

A

Amitab Kant

B

Shaktikanta Das

C

Montek Sing Ahluwalia

D

N.K. Singh

Question 7

The theme of World Environment Day 2021 is :

A

Restore our Earths

B

Seven Billion Dreams

C

Connecting people with nature

D

Eco-system Restoration

Question 8

Thalolam scheme means :

A

To provide free treatment to the children below age of eighteen

B

Acts as a relief measure for the Endosulfan victims in the state

C

Provide free medicines through mobiles clinics and counselling service to senior citizens

D

Financial aid for poor people suffering from serious ailments

Question 9

Ritty Lukose describes …………… as the "Political father of the Eahavas”.

A

Sree Narayana Guru

B

Dr. Palau

C

Kumaranasan

D

Nadaraja Guru

Question 10

The present Director of Kerala Institute of Local Administration (KILA) :

A

M.V. Govindan

B

Sarada G Muraleedharan

C

Dr. Joy Elamon

D

Hardeep Singh Puri

Question 11

The resistance of a parallel circuit consisting of two resistors is 12 Ω. One of the resistance wires breaks and the effective resistance becomes 18 Ω. The resistance of the broken wire is :

A

48 Ω

B

18 Ω

C

36 Ω

D

24 Ω

Question 12

When an electric current flows through a conductor, its temperature rises. This is because of :

A

Mutual collision of metal atoms

B

Mutual collision between conducting electrons

C

Collision between conduction electrons and atoms

D

Release of conduction electrons from parent atoms

Question 13

Two lamps of 200 W, 220 V, and 100 W, 220 V are connected in series across 220 V supply. The ratio of current through them will be:

A

1 : 2

B

1 : 1

C

2 : 1

D

1 : 4

Question 14

A battery is connected to a resistance causing a current of 0.5 A in the circuit. The current drops to 0.4 A when an additional resistance of 5 Ω is connected in series. The current will drop to 0.2 A when the resistance is further increased by :

A

10 Ω

B

15 Ω

C

25 Ω

D

40 Ω

Question 15

A voltage source of EMF E volts and internal resistance R Ω will supply, on short circuit, a current of:

A

E/R Amperes

B

Zero

C

Infinite

D

EX R Amperes

Question 16

The nodal analysis is primarily based on the application of :

A

Ohm's law

B

Kirchoff's current law

C

Kirchoff's voltage law

D

Both (A) and (B)

Question 17

Which of the following is a scalar quantity ?

A

Electric field strength

B

Electric displacement density

C

Electric potential

D

Force

Question 18

A coil wound over an iron ring carries certain current and establishes flux in the ring. If the area of x-section of the ring is doubled, the flux density in the core:

A

is double of the previous value

B

is half of the previous value

C

is same as the previous value

D

is not possible to predict

Question 19

The property of a coil by which a counter emf is induced in it when the current through the coil changes, is called the :

A

self-inductance

B

mutual inductance

C

capacitance

D

None of these

Question 20

A 50 Hz ac voltage is measured with a moving iron voltmeter and a rectifier type ac voltmeter connected in parallel. If the meter readings are V1 and V2 respectively and the meters are free from calibration errors, then the form factor of the ac voltage may be estimated as :

A

V1 / V2

B

1.11 V1 / V2

C

2 V1 / V2

D

π/2 V1 / V2

Question 21

An ac source having a voltage E = 110 sin (ωt + π/3) is connected in an ac circuit. If the current drawn from the circuit varies as I = 5 sin (ωt - π/3) the impedance of the circuit will be :

A

22 Ω

B

16 Ω

C

30.8 Ω

D

None of these

Question 22

A coil having a resistance of 5 Ω and inductance of 0.1 H is connected in series with a condenser of capacitance 50 μF. A constant alternating voltage of 200 V is applied to the circuit. The voltage across the coil at resonance is :

A

200 V

B

1788 V

C

1800 V

D

2000 V

Question 23

Three equal impedances are first connected in delta across a 3-phase balanced supply. If the same impedances are connected in star across the same supply.

A

Phase current will be one-third

B

Line current will be one-third

C

Power consumed will be one-third

D

None of the above

Question 24

W1 and W2 are the readings of two-watt meters used to measure power of a 3-phase balanced load. The reactive power drawn by the load is :

A

W1 + W2

B

W1 - W2

C

√3 (W1 + W2)

D

√3 (W1 - W2)

Question 25

The lamps of 40 W, 60 W and 100 W ratings are connected in different phases of a 3-phase four wire supply. If the neutral wire breaks, then the lamp likely to fuse first will be :

A

100 W

B

60 W

C

40 W

D

All lamps

Question 26

The superposition theorem requires as many circuits to be solved as there are.:

A

Nodes

B

Sources

C

Nodes and sources

D

Meshes

Question 27

Which of the following theorem is applicable for both linear and nonlinear circuits :

A

Superposition

B

Thevenin's

C

Norton's

D

None of these

Question 28

A 12 V source with an internal resistance of 1.2 Ω is connected across a wire wound resistor. Maximum power will be dissipated in the resistor when its resistance is equal to :

A

Zero

B

1.2 Ω

C

12 Ω

D

∞

Question 29

For connecting two voltage sources in parallel, which of the parameters should be equal ?

A

Phase and Magnitude

B

Frequency and Magnitude

C

Phase and Frequency

D

Frequency, Phase and Magnitude

Question 30

When 20 Ω and 30 Ω connected in parallel, the parallel combination is connected in series with another parallel combination of 10 Ω and 15 Ω, and this series and parallel combination is connected across a dc source of 100 V. The current supplied by the source is :

A

5.5 A

B

7A

C

8A

D

10 A

Question 31

Thevenin's resistance RTh is determined :

A

By short circuiting the given two terminals

B

By removing the voltage sources along with their internal resistances

C

Between any two open terminals

D

Between the same open terminals as for VTh

Question 32

Which of the following statement is correct ?

A

Norton's equivalent resistance is the same as Thevenin's equivalent resistance

B

Norton's equivalent is the current equivalent of the network

C

The load is connected in parallel to Norton's equivalent resistance and Norton's current source

D

(A), (B) and (C)

Question 33

An inductance of 8.0 mH is in series with two inductances in parallel, one of 3.0 mH and the other 6.0 mH. the equivalent inductance is ……………….

A

11 mH

B

9 mH

C

12 mH

D

10.0 mH

Question 34

Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load. This statement is associated with ……………

A

Thevenin's theorem

B

Maximum power transfer theorem

C

Superposition theorem

D

None of these

Question 35

A network having one or more than one source of emf is known as ………… network.

A

passive

B

active

C

linear

D

nonlinear

Question 36

Fleming's left-hand rule is applicable to :

A

de generator

B

dc motor

C

alternator

D

transformer

Question 37

Consider the following statements regarding speed control of dc motors :

(i) Ward Leonard method is suitable for constant torque drive.

(ii) Field control method facilitate speed control below the base speed.

(iii) Armature resistance control method is more efficient when compared to the Ward Leonard method.

(iv) Field control method is suitable for constant power drives.

Of the statements :

A

(i), (ii) and (iii) are correct

B

(i), (ii) and (iv) are correct

C

(i), (iii) and (iv) are correct

D

(i) and (iv) are correct

Question 38

The emf induced in a conductor rotating in a bipolar field is :

A

dc

B

ac

C

both dc and ac

D

none of these

Question 39

A 200 V dc machine has an armature resistance of 0.5 If the full load armature current is 30 A, the induced emf when the machine run (i) as a generator and (ii) as a motor will be :

A

230 V, 170 V

B

225 V, 175 V

C

185 V, 215 V

D

215 V, 185 V

Question 40

A dc series motor develops a torque of 20 Nm at 3 A of load current. If the current is increased to 6 A, the torque developed will be :

A

10 Nm

B

20 Nm

C

80 Nm

D

40 Nm

Question 41

A transformer is so designed that primary and secondary have :

A

High lenkage ronctance

B

Large resistance

C

Tight magnetic coupling

D

Good electric coupling

Question 42

A single phase 50 Hz core type transformer has square cores of 20 cm side. The permissible flux density is 1 Wb/m2. If the stacking factor is 0.9, the voltage induced per turn is :

A

6

B

11

C

8

D

14

Question 43

A 2 kVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is :

A

400 W

B

300 W

C

600 W

D

500 W

Question 44

Regarding the working component Iw and magnetizing component Im of the no load primary current of a transformer, which of the following statement is true ?

A

Iw

B

Iw>Im

C

Iw=Im

D

Iw / Im = constant

Question 45

When a 400 Hz transformer is operated at 50 Hz its kVA rating is :

A

Reduced to 1/8

B

Increased 8 times

C

Unaffected

D

Determined by load on secondary

Question 46

In a synchronous machine, the voltage induced by armature reaction flux acts like the voltage drop in :

A

Inductive reactance

B

Resistance

C

Capacitive reactance

D

Inductive impedance

Question 47

In which coil the harmonic component of the generated emf will be more :

A

full-pitch coil

B

short-pitch coil

C

long-pitch coil

D

none of these

Question 48

The purpose of damper winding in an alternator is :

A

To reduce hunting

B

To reduce hunting and to help while starting

C

To help in starting

D

All of the above

Question 49

The load taken up by the alternator directly depends upon the driving torque and :

A

excitation

B

load current

C

load speed characteristics

D

angular advance of its rotor

Question 50

The load angle of a synchronous generator in the angle between the excitation voltage and :

A

bus bar voltage

B

bus bar current

C

bus bar impedance

D

none of these

Question 51

A synchronous motor operates only at the synchronous speed which is determined by the :

A

back emf and flux

B

number of poles and supply frequency

C

supply voltage and the synchronous impedance

D

back emf and the supply frequency

Question 52

A synchronous motor draws minimum current when the pf of the motor is :

A

zero

B

0.6 leading

C

0.6 lagging

D

unity

Question 53

The speed of a synchronous motor can be varied by varying its :

A

excitation

B

supply voltage

C

load

D

frequency

Question 54

The total steady state torque to drive the synchronous motor and the load at synchronous speed is known as ………….. torque.

A

reluctance

B

pull-out

C

synchronous

D

average

Question 55

What is the condition to obtain the maximum starting torque of an induction motor ?

A

r2 = x2

B

2r2 = x2

C

r2 = 3x2

D

r2 = 4x2

Question 56

The maximum induced emf in an induction motor rotor is at :

A

running

B

standstill

C

maximum torque

D

maximum efficiency

Question 57

If the slip is 10% in an induction motor; the ratio of rotor copper loss to rotor output is :

A

1 : 8

B

1 : 9

C

1 : 10

D

1 : 11

Question 58

Synchronous wattage of an induction motor is the power transferred across the :

A

air-gap to rotor

B

rotor shaft

C

supply to stator

D

none of these

Question 59

In an induction motor, if the air-gap is increased :

A

speed will reduce

B

efficiency will improve

C

pf will be lowered

D

breakdown torque will reduce

Question 60

An increase in rotor circuit reactance of a 3-phase induction motor will :

A

reduce starting torque as well as maximum torque

B

increase starting torque as well as maximum torque

C

increase starting torque and reduce maximum torque

D

increase maximum torque and reduce starting torque

Question 61

Which one of the following is not the example of closed loop control system?

A

Auto pilot for an air-craft

B

Liquid level control system

C

Electric switch

D

Traffic signal system

Question 62

Inverse Laplace Transform of 2s+4 / s2+4s+3 is:

A

x(t) = [e-t+e-3t]u(t)

B

x(t) = [e-t+e-2t]u(t)

C

x(t) = [e-2t+e-3t]u(t)

D

x(t) = [et+e-3t]u(t)

Question 63

Zero initial conditions for a system means :

A

system at rest with no energy stored in any of its components

B

system at rest with stored energy

C

system having zero input

D

system without any storage element

Question 64

Steady state error of a control system can be reduced by increasing :

A

gain constant of the system

B

time constant of the system

C

both gain constant and time constant

D

none of the above

Question 65

The damping ratio of the characteristic equation s2+2s+8=0.

A

0.353

B

0.350

C

0.30

D

0.333

Question 66

Transistor's α and β are related by the equation :

A

β = α/1+a

B

β = α/1- α

C

α = β/1+ β

D

α = β/1- β

Question 67

The arrow in the symbol of a transistor is shown going inside, the transistor is of the type :

A

pnp

B

npn

C

pnpn

D

none of these

Question 68

A silicon control rectifier is made of four alternate layers of p-type and n-type of semiconductor, The number of terminals is :

A

four

B

five

C

threo

D

two

Question 69

In a semiconductor, the energy gap between valence and conduction bands is :

A

zero

B

lesser than 5 eV

C

more than 5 eV

D

about 15 eV

Question 70

Which of the following diode is used for voltage stabilization ?

A

p-n junction

B

Zener

C

Tunnel

D

Hot carrier diode

Question 71

Maximum efficiency of a half wave rectifier is :

A

20.3%

B

40.6%

C

50%

D

81.2%

Question 72

The peak inverse voltage across the diode in a full-wave rectifier using two diodes and a central tapped transformer is :

A

Vm/π

B

2Vm

C

Vm/√2

D

Vm

Question 73

The binary and hexadecimal number systems, respectively, have radixes :

A

2 and 10

B

16 and 10

C

2 and 16

D

16 and 2

Question 74

Name the logic gate.

A

OR gate

B

NOT gate

C

AND gate

D

ENABLE gate

Question 75

Find the binary equivalent of the decimal number 46.

A

101010

B

011100

C

100111

D

110100

Question 76

Find the hexadecimal equivalent of the binary number 11000011.

A

CA

B

AE

C

C3

D

None of these

Question 77

A square wave with a period of 10 μs drives a T flip-flop. The period of the output signal will be:

A

100 μs

B

20 μs

C

10 μs

D

5 μs

Question 78

The program which translates the instructions in assembly language into the corresponding binary machine language instruction is called :

A

Assembler

B

Loader

C

Compiler

D

Interpreter

Question 79

What is the function of control unit in the CPU ?

A

Decoding of program instructions

B

Transfer of data to primary storage

C

Performing logical operations

D

Storage of program instructions

Question 80

Accumulator is a :

A

Storage battery for supplying necessary power to the system

B

Hardware which stores one of the operands to be manipulated by the ALU

C

Hardware which stores memory in the memory unit

D

Hardware used to link the control unit with I/O unit

Question 81

Transmitting power remaining the same, if the supply voltage of a dc 2-wire distributor is doubled saving in copper will be :

A

25%

B

50%

C

75%

D

100%

Question 82

ACSR is used in place of copper in overhead lines because of :

A

higher current carrying capacity

B

being lighter in weight

C

Economy

D

higher tensile strength

Question 83

Which of the following statements is true regarding Corona ?

A

Corona takes place at a voltage lower than breakdown voltage

B

Corona takes place at a voltage higher than breakdown voltage

C

Corona is a current phenomenon

D

Corona increase the transmission line efficiency

Question 84

In a transmission line of negligible resistance, the surge impedance will be :

A

√(L/C)

B

√(C/L)

C

1 / √(LC)

D

√(LC)

Question 85

A 6000 kVA, 50 Hz star connected alternator is connected to a 6,6 kV infinite bus bar and is running at 1000 rpm. At no load the synchronising power of alternator with 10% reactance is :

A

1812 kW

B

3138 kW

C

1046 kW

D

none of these

Question 86

Thyristors is a generic name for a semiconductor switch having :

A

two or more layers

B

four or more layers

C

three or more layers

D

five layers

Question 87

DIAC and TRIAC are :

A

single-way switches

B

three-way switches

C

bidirectional switches

D

none of these

Question 88

In a GTO, the turn-OFF is ---------- whereas in SCR, the turn-OFF is ----------

A

controlled, uncontrolled

B

uncontrolled, controlled

C

controlled, controlled

D

uncontrolled, uncontrolled

Question 89

Compared to the BJT, the MOSFET drive circuit power requirement is :

A

higher

B

lesser

C

same as BJT

D

none of these

Question 90

The output de voltage of single-phase bridge rectifier is :

A

2Vm/π cosα

B

Vm/π cosα

C

Vm/2 cosα

D

2Vm cosα

Question 91

Which is the final part of making an idol ?

A

Silachanayana

B

Manakalpana

C

Pithanyasa

D

Netronmilana

Question 92

Which is the part in between Kurma and Napumsakasila in a Shadadharaprathishta ?

A

Yoganala

B

Padma

C

Nidhikumbha

D

Adharasila

Question 93

Tantrasamuchaya was written by :

A

Chennas Narayanan Namboothiripad

B

Kalpuzha Divakaran Namboothiripad

C

Isanasivaguru

D

Vilwamangalam Thrivikrama

Question 94

Which of the following is the famous Tantric text written by Sree Sankaracharya ?

A

Vishnusamhita

B

Saradatilakam

C

Prapanchasara

D

Prayogamanjari

Question 95

Maha Sivaratri is celebrated in :

A

Vaisakha Krishnapaksha Dvadasi

B

Jyeshtha Suklapaksha Trayodasi

C

Phalguna Krishnapaksha Chaturdasi

D

Pausha Suklapaksha Ekadasi

Question 96

According to Viswakarmya' text which part of a temple denotes throat of a human body?

A

Garbhagrha

B

Mandapa

C

Prakara

D

Gopura

Question 97

Ramanujacharya is known to be the proponent of :

A

Dvaita philosophy

B

Nyaya philosophy

C

Visishtadvaita philosophy

D

Sudhadvaita philosophy

Question 98

Lalitasahasranama belongs to :

A

Bhagavatapurana

B

Devibhagavata

C

Padmapurana

D

Brahmandapurana

Question 99

To which Indian architectural style, Chennakesava temple is associated ?

A

Hoysala

B

Pallava

C

Chalukya

D

Chola

Question 100

Which part of the Veda is meant by the word 'Vedanta' ?

A

Samhita

B

Brahmana

C

Aranyaka

D

Upanishad

102/2022 - Assistant Engineer (Electrical) - Travancore Devaswom