| Post Name | Technician GrII - Electrician - Kerala Co-operative Milk Marketing Federation Ltd |
|---|---|
| Question Paper Code | 030/2020 |
| Category Code | 061/2019, 412/2019, 506/2019, 542/2019, 543/2019, 196/2019, 209/2019, 326/2019 |
| Date of Test | 30 September 2020 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The fusing factor of HRC fuse will be
Answer
D. 1.1
2
Resistance of 230 v 100 w incandescent lamp is
Answer
B. 529 ohm
3
Temperature coefficient of resistance is measured in
Answer
A. Ohm/°c
4
Example of paramagnetic material is
Answer
C. Air
5
Working voltage of megger for testing domestic installations are
Answer
C. 500 v
6
The power factor of purely resistive circuit is
Answer
A. Unity
7
The capacitive reactance is measured in
Answer
B. Ohm
8
Permalloy is an alloy containing
Answer
A. Nickel and iron
9
For a sinusoidal current crest factor is
Answer
B. 1.414
10
The specific gravity of electrolyte in a fully charged lead acid battery is
Answer
A. 1.285
11
The composition of tin and lead used in electrician solder are
Answer
B. 60%, 40%
12
The material used as negative electrode in lithium cell is
Answer
A. Lithium
13
The reciprocal of frequency is known as
Answer
A. Time period
14
The number of electrons in an aluminium atom is
Answer
A. 13
15
The capacity of a lead acid battery is expressed in
Answer
B. Ampere hour
16
The unit of permeability is
Answer
Question Cancelled
17
Relative permittivity of vacuum is
Answer
C. Unity
18
The ohmmeter reading for a shorted capacitor is
Answer
A. Zero
19
The equivalent of one picofarad is
Answer
B. 1/10¹² F
20
A parallel circuit is used as divider for
Answer
D. Current
21
The electrical instrument used to measure current is
Answer
B. Ammeter
22
The maximum number of lighting points that can be connected in a circuit is
Answer
B. 10
23
One B.O.T. unit is equal to
Answer
C. 1000 wh
24
The minimum distance between two plates in plate earthing which are parallel should be
Answer
D. 3 m
25
AC single phase energy meter record the energy in the unit of
Answer
B. Kilo watt hour
26
The unit of reluctance is
Answer
B. Ampere turns/Weber
27
A material that is slightly repelled by a magnet is called
Answer
C. Diamagnetic
28
The phases angle between voltage and current in a pure inductive circuit is
Answer
B. 90
29
Two capacitors of 5 Micro farad each are connected in parallel their total effective
capacitance is
Answer
A. 10 micro farad
30
Aluminium becomes super conductor at
Answer
C. –272.15C
31
Energy stored in an inductance is given by
Answer
Question Cancelled
32
The expansion of XLPE cable is
Answer
C. Cross-linked polyethylene cable
33
Name the non-metal will conduct electricity.
Answer
C. Graphite
34
A depolarizer in a dry cell is
Answer
C. Manganese dioxide
35
The material has a negative temperature coefficient of resistance is
Answer
C. Carbon
36
Electrochemical equivalent of aluminium is
Answer
A. 0.0936
37
Three capacitors each of 100 Micro farad are connected in series across 100 v supply
there equivalent capacitance is
Answer
C. 33.33 Micro farad
38
Which colour wire is recommended for earth connection as per lSI code ?
Answer
B. Green
39
The maximum value of a sine wave AC voltage is 10 v, its rms value is
Answer
C. 7.070
40
The direction of flow of lines of force around a bar magnet is
Answer
B. Out of the North Pole into the South Pole
41
From the following power plants which one has the least operating cost ?
Answer
A. Hydro-electric
42
In DC shunt motor what is the relation between speed, flux and back EMF ?
�
Answer
C. N �
43
The maximum permissible voltage drop in a 240 V network is 30%. What is the
minimum acceptable voltage in any point of the network ?
Answer
Question Cancelled
44
Which one of the following three phase motor is not self-starting ?
Answer
A. Synchronous motor
45
The fuel used in nuclear generation power plants is
Answer
D. Isotopes of uranium
46
Removing the load from a DC series motor while working, what will happen to its
speed ?
Answer
A. Will increase
47
The width of a trench for laying a single cable should be a minimum of ______ cm.
Answer
D. 35 cm
48
The fractional slip (S) of an induction motor can be found by the formula
Ns � Nr Ns � Nr
Answer
A. S �
49
The sun makes energy in its inner core by a process called
Answer
C. Nuclear fusion
50
In S.I. System what will be the unit of Torque of DC motor ?
Answer
A. Newton-meter
51
What is the purpose of bedding in an underground cable ?
Answer
B. To protect the metallic sheath from mechanical injury from armoring
52
Calculate the synchronous speed (N) of 5 HP, 8 pole/415 V/50 Hz, three phase
squirrel cage induction motor
Answer
C. 750 rpm
53
In a steam power plant ________ is used to heat the feed water from the flue gas.
Answer
B. Economizer
54
While conducting a no-load test in a DC series motor, what consequences will occur ?
Answer
B. The motor will reach such a high speed that the centrifugal force may destroy
the motor winding
55
Epoxy cable joint is used
Answer
A. Where heating of the cable is not permitted
56
The starter used for slip ring induction motor is
Answer
B. Rotor resistance starter
57
In bio gas mixture ________ is the main constituent.
Answer
A. Methane
58
Regenerative or Hopkinson’s test may be conducted on DC machines on ___________
load.
Answer
B. Full-load
59
Which of the following DC distribution system is the simplest and lowest in first cost ?
Answer
A. Radial system
60
Which of the following speed is called the actual speed in a three phase induction
motor ?
Answer
A. Rotor speed
61
Which one of the following is not a non-conventional (renewable) source of energy ?
Answer
C. Nuclear energy
62
During rheostat breaking of DC series motors
Answer
B. Motor is run as a generator
63
ACSR conductors could be joined by using
Answer
Question Cancelled
64
How is the slip ring induction motor connected to the main ?
Answer
A. Supply to stator winding, rotor winding shorted through resistance
65
Which one is used to generate power in geothermal station ?
Answer
B. Heat inside the earth
66
The no-volt coil is used as a protective device in a motor starter. What is its main
function ?
Answer
C. Open supply circuit upon failure or reduction of voltage and keep open until
manually closed
67
Non-conductor of an overhead line, including service lines erected across a street
shall at any part there of, be at a height less than ___________ meters for high
voltage lines.
Answer
B. 6.096
68
In the manual star-delta starter, the stop button connection is in series with the
Answer
C. No-volt coil and load relay contacts
69
Equipment used for pulverizing the coal is known as
Answer
C. Ball mill
70
______________ is the formula for dynamically induced EMF.
Answer
Question Cancelled
71
The depth of pole below the ground level on a normal soil should be
1 th
Answer
C. of the height of the pole
6
1 th
72
When the three phase squirrel cage induction motor is started by star-delta starter,
the starting current is reduced to
1
Answer
D. times
73
Which of the following is conventional source of energy ?
Answer
A. Coal
74
The terminal markings of a separately excited DC generator as per Indian
standard is
Answer
A. A1, A2, E1, E2
75
__________ is the factor which least affects the sag of a transmission line.
Answer
B. Current through the conductor
76
What is the purpose to conduct blocked rotor test in a three phase induction motor ?
Answer
A. To determine the full load copper loss
77
A solar module is made up of large number of
Answer
B. Solar cells
78
Which liquid do you use for cleaning the commutator of a DC generator ?
Answer
A. Carbon tetra chloride
79
The depth of laying underground cable from the ground surface for 11 KV HT
cable is
Answer
B. 0.9 m
80
If two phases of the supply are interchanged, what will happen to a three phase
induction motor ?
Answer
A. The motor rotates in reverse direction
81
Which force is required to move the pointer from zero position in an indicating
instrument ?
Answer
B. Deflecting force
82
Which source of measuring error is caused by the effect of magnetic fields ?
Answer
C. Influence error
83
Which type of instrument is used with air friction damping ?
Answer
B. Moving iron instrument
84
Why damping force is required in a moving coil instrument ?
Answer
D. Arrests the needle to its zero position
85
What is the typical efficiency range of a transformer ?
Answer
C. 92 to 99%
86
What is the relationship between primary and secondary currents of a transformer ?
Answer
B. Comparison of the primary and secondary ampere turns
87
What is the secondary induced EMF in a transformer?
Answer
B. Eₛ = (4.44 × f × Nₛ × ϕₘ) volts
88
What is the working principle of autotransformer ?
Answer
D. Self-induction
89
Which condition is correct for parallel operation of transformer ?
Answer
D. All the above
90
Which method of cooling is generally adopted for low capacity distribution transformer
up to 100 KVA ?
Answer
B. Natural air method
91
What is the unit of luminous intensity ?
Answer
B. Candela
92
What is the operating temperature of tungsten filament lamp ?
Answer
A. 2300°C
93
Which material is used to make the discharge tube of MA type HPMV lamp ?
Answer
C. Borosilicate tube
94
Which type of motor is used in food mixer ?
Answer
B. Universal motor
95
What is the purpose of sole plate in electric kettle ?
Answer
D. Keep the element in close contact with container
96
Which one is a semi-conductor material ?
Answer
B. Silicon
97
What is the method to increase the conductivity in a semi-conductor ?
Answer
C. Doping
98
Which type of semi-conductor the free electrons are majority ?
Answer
D. N-type
99
What is the main application of SCR ?
Answer
D. Speed control of motors
100
Which doping material is used to make P- type Semi-conductor ?
Answer
A. Boron
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