| Post Name | OPERATOR - KERALA WATER AUTHORITY |
|---|---|
| Question Paper Code | 008/2022 |
| Category Code | 211/2020 |
| Date of Test | 4 February 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The unit of solid angle is :
Answer
B. steradian
2
What is the temperature co-efficient value of aluminium at 208 celcius ?
Answer
A. 40.3×10−4
3
Melting point of copper is :
Answer
A. 10838C
4
One ampere-hour is equal to :
Answer
B. 3600 coulombs
5
The shape of warning sign is __________.
Answer
C. triangular
6
Unit of M.M.F. is :
Answer
D. Ampere turns
7
What is the permeability of bismuth ?
Answer
Question Cancelled
8
The lifting power of a magnet is :
Answer
A. B2A/2µ 0
9
Which type of capacitors are used in RF coupling circuits ?
Answer
C. monolithic
10
Each question is provided with four choices
Answer
Question Cancelled
11
The speed of electricity is :
Answer
A. 2,97,842 km/s
12
What is the resistance of the inductive coil takes 5 A current across 240 V, 50 Hz supply
at 0.8 P.F. ?
Answer
Question Cancelled
13
In a 3 phase system, if the active power is 4 kW and the apparent power is 5 kVA,
calculate the reactive power.
Answer
C. 3 kVAR
14
What is the dielectric strength in kV/mm of asbestos at 20°C?
Answer
B. 42
15
Two wattmeter method is used to measure the power in __________ load.
Answer
D. balanced and un-balanced load
16
To magnetize a steel is difficult because of its :
Answer
D. low permeability
17
What is the effect if one cell is connected with reverse polarity in a parallel combination
circuit ?
Answer
C. will get short circuited
18
The depolarizer is used in dry cell is :
Answer
Question Cancelled
19
Two batteries each of open circuit voltage 2 V and internal resistance of 2 ohm are
connected in parallel to supply a load of 2 ohm the current supplied by the battery is :
Answer
Question Cancelled
20
A 24 ohm and 8 ohm resistors are in parallel have a combined resistance of :
Answer
D. 6 ohm
008/2022 4 A
21
The control force employed in an indicating instrument, which can be kept in any
position is :
Answer
D. spring control
22
If the meter constant mentioned in the meter is 1500 revolution/k.W.H., in one
revolution, the energy consumption is :
Answer
A. 40 watt-minutes
23
Maxwell-Wein bridge is used for measuring :
Answer
C. inductance
24
The line voltage of a delta-connected three-phase circuit is 415 V. The phase voltage
is :
Answer
D. 415 V
25
In a 3 phase star connected resistive load the resistance of each phase is 50 ohm if one of
the resistances is removed and 200 V supply is given the absorbed power will be :
Answer
B. 400 W
26
In Flemings left hand rule, forefinger indicates :
Answer
C. Direction of field
27
A current transformer step up :
Answer
A. Voltage
28
Hunting occurs in :
Answer
C. Synchronous motor
29
The system earthing is done at :
Answer
C. Generating station
30
An example of cold cathode lamp is :
Answer
A. Neon lamp
31
Decimal equivalent of Hexadecimal number ‘D’ is :
Answer
B. 13
32
Terminals of a IGBT are :
Answer
B. Emitter, Collector, Gate
33
The capacity of Transformers are rated by its :
Answer
C. Apparent power
34
Which circuits quick response type diazed fuses are used ?
Answer
B. Heating circuits
35
How many number of brushes are used in wave wound DC shunt generator ?
Answer
B. 2
36
A JFET is a __________ driven device.
Answer
A. Voltage
37
The radix of decimal number system is :
Answer
C. 10
38
As per BIS the shunt field winding terminals of a DC machine is marked :
Answer
B. E1 & E2
39
The V-curve of a synchronous motor is the relation between :
Answer
D. Armature current & rotor field current
008/2022 6 A
40
Which transformer does not step up or step down the voltage ?
Answer
B. Isolation transformer
41
Binary value of 0101 is equivalent to decimal number :
Answer
A. 5
42
An SCR has __________ semiconductor layers.
Answer
C. 4
43
Ripple frequency of full wave bridge rectifier is :
Answer
B. 2 F input
44
Which method of speed control is used to obtain above normal speed in DC series
motor ?
Answer
C. Field diverter method
45
Which one is a Universal gate ?
Answer
B. NOR
46
A UJT contains __________ PN junctions.
Answer
A. 1
47
The insulation resistance of a DC motor is measured in :
Answer
C. Mega ohms
48
Which test is used to check whether the switches are connected in live wire or not ?
Answer
D. Polarity test
49
Which electrical accessories is used for taking supply from a lamp holder ?
Answer
C. Adaptor
50
An example of invertor gate is :
Answer
C. NOT
51
What is the purpose of soldering on sheet metal joint ?
Answer
C. To avoid leak
52
Which part in the internal gear pump act as seal ?
Answer
D. Cresent shaped spacer
53
Which rivet used in heavy structural work ?
Answer
A. Pan head rivet
54
Which washers are commonly used for structural fabrication work ?
Answer
B. Punched washers
55
Which metal is very soft and heavy in sheet metal work ?
Answer
A. Lead
56
Which hammer is suitable for riveting ?
Answer
B. Ball pein hammer
57
Which key is used for easy fixing and removing ?
Answer
B. Gib-head key
58
Which type of nut required aligning the axle shaft hole and slot of the nut for locking ?
Answer
A. Castle nut
59
Which energy is converted in hydraulic pump ?
Answer
D. Mechanical energy to hydraulic energy
008/2022 8 A
60
Which type of filter helps to protect the pump from fluid contaminations ?
Answer
A. Suction filter
61
Which of the following is an insulator ?
Answer
D. PVC
62
Which is a good conductor ?
Answer
A. Silver
63
Which law states that “The current is directly proportional to the voltage and inversely
proportional to the resistance” ?
Answer
A. Ohm’s law
64
What is the material of negative plate in the lead acid battery ?
Answer
C. Spongy lead
65
Which instrument is prohibited to connect with live wire ?
Answer
C. Ohm meter
66
Which measuring instrument used to measure the ampere, volt and resistance ?
Answer
D. Multi meter
67
What is the unit of potential difference ?
Answer
D. Volts
68
What is the advantage of free maintenance sealed battery ?
Answer
A. No need for check and top up distilled water
69
Which is a temperature sensitive resistor ?
Answer
C. Thermistor
70
Which circuit the ballast resistor is used ?
Answer
C. Flasher circuit
71
Which of the following is true about the thermodynamic cycle of a diesel engine ?
Answer
B. Constant pressure cycle
72
What is the range of compression pressure of a typical petrol engine ?
Answer
A. 90 to 150 PSI
73
Which of the following is false about engine cooling system ?
Answer
D. Engine overheats if the thermostat valve is stuck open.
74
In which of the following types of oil pumps does not use eccentric shafts or cams ?
Answer
A. External gear type pump
75
Which of the following statements is false about lubrication system ?
Answer
B. All the oil reaching main oil gallery is filtered in Bypass oil filter system.
76
Which of the following is false about fuel system ?
Answer
C. An engine can be started without the signal from Crank position sensor
77
Which of the following type of pump needs more frequent overhaul frequency than
others under similar operating conditions ?
Answer
A. Submersible pump
78
Which of the following is true about the Submersible pumps ?
Answer
D. All are true
79
Which of the following is false about Jet pumps ?
Answer
B. The motor and pump cannot be offset from the well
80
Which of the following is wrong ?
Answer
D. Faulty pressure switch will result in pump not starting up
81
Crowning of pulleys are done for :
Answer
B. Lesser chance of belt running off
82
Which of the following is not true about induction motors ?
Answer
C. Low rotor resistance means high starting torque
83
Which type of valve is used for very fine control of fluid flow ?
Answer
D. Needle valve
84
Which of the following starters are used for starting a squirrel cage motor ?
Answer
Question Cancelled
85
Which of the following is false about D.O.L starters ?
Answer
C. Can be used without backup fuses
86
Which of the following are the features of an ELCB, MCB Circuit breaker ?
Answer
D. All of these
87
What is cut-off factor of a fuse ?
Answer
D. Time taken by a fuse to interrupt the circuit in the event of a fault
88
To what limit of current beyond which Re-wirable fuses are not usually preferred ?
Answer
A. 200 A
89
Which of the following relays designed to operate when current falls below a
predetermined value ?
Answer
C. Under-current relay
90
Which of the following is not a reason of motor running hot ?
Answer
D. Blown fuse
008/2022 12 A
91
Inside which of the following hydraulic pumps a crescent shaped spacing can be
found ?
Answer
B. Internal gear pump
92
Which of the following is true about temperature sensors ?
Answer
Question Cancelled
93
Which of the following components serves the purpose of retaining the piston down
against the seat in balanced condition in a pressure relief valve ?
Answer
D. Light spring
94
Which of the following is a dependant factor on fluid flow rate of a variable flow control
valve ?
Answer
D. All of these
95
Which of the following is not true about pneumatic systems ?
Answer
B. The expansion of PRV is Pressure Return Valve
96
Which of the following is false about Orifices ?
Answer
B. The orifice is always connected in parallel with the pump
97
Which of the following is not associated with hydraulic actuator speed control ?
Answer
D. Bleed out speed control
98
Which one of the following terms is associated with positive displacement pumps ?
Answer
D. Screw rotors
99
Which of the following is not related with pipe joints ?
Answer
D. Flanged bush
100
Which of the following is not true about pumps ?
Answer
D. Self priming devices are connected between discharge pipe and pump
-o0o-
008/2022 14 A
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