| Post Name | Operator - Kerala Water Authority 734/2025, 735/2025 |
|---|---|
| Question Paper Code | 077/2026 |
| Category Code | 734/2025, 735/2025 |
| Date of Test | 14 August 2026 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
What is the unit of conductance ?
Answer
A. mho
2
Which is the application of series circuit ?
Answer
D. Fuse in a circuit
3
What electrical quantities are related in Ohm’s law ?
Answer
C. Current, voltage and resistance
4
What is the effect of the parallel circuit with one branch opened ?
Answer
C. No current will flow in that branch
5
Which one defines the change in resistance in Ohm (Ω) per degree centigrade (°
Answer
D. Temperature co-efficient
6
Which is the diamagnetic substance ?
Answer
C. Water
7
Which is the correct expression of capacitance C if the electric charge is Q and the
voltage is V ?
Answer
A. C = Q/V
8
What is the S.I. unit of flux density ?
Answer
A. Tesla
9
What is the value of resistance in an open circuit ?
Answer
D. Infinity
10
Which type of meter is used to test the polarity of battery ?
Answer
B. moving coil voltmeter
11
What is the change in value of resistance of the conductor, if its cross section area
is doubled ?
Answer
B. decreases 2 times
12
Which electrical quantity is directly proportional to the eddy current ?
Answer
C. Frequency
13
Which factor is determining the value of capacitance in capacitor ?
Answer
A. Area of the plates
14
What is the name of defect that bending of plates in secondary cells ?
Answer
A. Buckling
15
What is the effect if one cell is connected with reverse polarity in a parallel combination
circuit ?
Answer
C. Will get short circuited
16
Which material is used to make core of power transformer ?
Answer
D. Cold rolled grain oriented
17
Which type of emf is induced in an ideal two winding transformer ?
Answer
B. mutually induced emf
18
Which method of magnetization is used to make commercial purpose permanent
magnets ?
Answer
A. Induction method
19
What indicates the shape of a BH curve (Hysteresis loop) of material ?
Answer
C. magnetic properties of the material
20
Which defines the flux density is always lagging behind the magnetising force ?
Answer
A. Hysteresis
21
What are the most prime reasons for the severity of shock ?
Answer
B. magnitude of current and duration of contact
22
How can you stop bleeding in the wound of an accidental person ?
Answer
D. Apply pressure to the wound
23
Which one of the guidelines is true for the installation of batteries ?
Answer
D. Location of battery installed should be free from heat sources and flame
24
The top surface of a solar cell consists of an extremely thin layer of a P-type material.
Why this type of construction ?
Answer
A. light can penetrate the junction
25
Why are cells connected in series ?
Answer
C. To increase voltage rating
26
In which three-phase connection, the line voltage is always 3 times the phase
voltage ?
Answer
C. Star connection
27
The value of an alternating quantity at any particular instant is called
Answer
B. Instantaneous value
28
Find out the Time period (T) of a 60 Hz sinusoidal AC supply.
Answer
A. 0.017 Seconds (S)
29
Which one of the following is a disadvantage of AC compared with dC ?
Answer
D. Inductive reactance and capacitive reactance are in AC compared to dC
30
The ‘lead’ and ‘lag’ are used to describe the relative positions in time of two voltages
or currents that are not in phase. In which type of circuit, the currents lag behind the
applied voltage by 90° ?
Answer
B. In pure inductive circuit
31
Which of the following is a part of the digital voltmeter ?
Answer
D. ANd gate
32
In the two-wattmeter method of three-phase power measurement, what is the reading
of electro-dynamic wattmeters when the power factor attains 0.5 ?
Answer
A. One of the wattmeter’s readings is zero and the other shows total power
33
Which one is not an application of tong tester ?
Answer
C. measure the short circuit current of dC motors
34
Select the expansion of the term ‘TOd’ related to TOd meters.
Answer
B. Time of day
35
Which type of metre has reeds and flags ?
Answer
C. Frequency meter
36
What is the name of the maximum value of potential difference between points on
the ground and a point touched by the person ?
Answer
C. Touch potential
37
What are the types of coils wrapped around the Torroid ring in an ECB ?
Answer
A. Phase coil, neutral coil and sensor coil/secondary coil
38
Which one is not a type of lamp holder ?
Answer
A. Jacobs push type lamp holders
39
Which one is not a method of reducing the resistance of an earth electrode to an
acceptable value ?
Answer
C. Reduce the depth of the pit below 0.5 m
40
A _________ switch can be used for controlling machinery as part of a control system,
as a safety interlock or as a counter enumerating objects passing a point.
Answer
B. limit switch
41
Rotor or induction motor runs always
Answer
C. Less than synchronous speed
42
In dC generator, current to external circuit from armature is given through
Answer
B. Commutator
43
A short gap in an induction motor is necessary to
Answer
D. For good power factor
44
On no load magnetic neutral axis and geometric neutral axis are
Answer
A. Same
45
Choose the correct answer from the following options for the question states below.
The direction of rotation of a DC motor can be changed by
1. Changing the supply terminal
2. Changing the supply voltage
3. Changing the armature terminal
4. Changing field terminal
Answer
D. Option 3 and 4 are correct
46
When the motor takes current above normal what happens if the no volt coil is open
circuited ?
Answer
C. motor will run on above normal speed
47
In a repulsion motor, maximum torque is developed when
Answer
D. Brush axis is at 45 degree electrical to field axis
48
The mechanical power developed by a dC motor is maximum when
Answer
B. Back emf is equal to half the applied voltage
49
If the input to the prime mover of an alternator is kept constant but the excitation is
increased
Answer
B. KVA will be lagging
50
The armature current drawn by a dC motor gives proportional to
Answer
D. The torque required
51
Binary equivalent of an octal number 35 is
Answer
B. 011 101
52
The output of two input NANd gate is low when its
Answer
C. Both inputs are high
53
In RS flip-flop when R = 0, S = 1 the output will be
Answer
A. 1
54
The carry output of a Half adder circuit having inputs A and B is
–
Answer
D. C = A·B
55
An array of flip-flops designed to store and shift data is
Answer
D. Shift registers
56
What will be the output ripple frequency of a full wave bridge rectifier for 230 V,
60 Hz input supply voltage ?
Answer
C. 120 Hz
57
Ripple factor of Half wave and Full wave rectifiers are respectively
Answer
A. 1.21 and 0.48
58
Which of the following is the most popular application of UJT ?
Answer
C. Relaxation oscillator
59
The terminals of N-channel FET is
Answer
B. Source, drain, Gate
60
The three terminal semiconductor device which controls AC in either direction is
Answer
C. TRIAC
61
What is the name of the process where vapour bubbles form and collapse in a
Centrifugal pump ?
Answer
B. Cavitation
62
Which part of a centrifugal pump connected to the Sump ?
Answer
C. Eye of the impeller
63
What is the main advantage of using submersible pump ?
Answer
B. Self priming
64
Which of the pump is used for pumping viscous fluids ?
Answer
C. Gear pump
65
What is the respective ratio of tin and lead composition in coarse solder ?
Answer
C. 40 : 60
66
________ fluxes are acidic and chemically active.
Answer
B. Inorganic
67
The tank of blow lamp is made with
Answer
A. Brass
68
Which solution is used to separate aluminium from bauxite ?
Answer
A. Fused cryolite
69
Which type of motions are the cotter joints used ?
Answer
B. Reciprocating
70
Headless screw used to hold two parts in position are known as
Answer
B. Grub screw
71
What is the temperature in the cylinder at the time of compressed air pressure during
compression stroke of a diesel engine ?
Answer
C. Upto 800°C
72
Find out the following statement is suitable for the engine.
“The upward motion of the piston creates a partial vacuum inside the crank-case
below the piston and the air/fuel mixture is drawn into the crank-case through the
inlet port”
Answer
B. Two stroke petrol engine
73
Why a heavier flywheel is required in four-stroke engine ?
Answer
A. due to more idle strokes and non-uniform load on the crank shaft
74
Which engine operates under constant volume cycle
Answer
B. SI engine
75
Which type of starting system is commonly used to start the heavy duty earth moving
engines ?
Answer
A. Gasoline engine starting
76
What is meant by the ratio between the air drawn in the cylinder during the suction
stroke and the volume of the cylinder ?
Answer
D. Volumetric efficiency
77
Why Baffles are provided in the fuel tank ?
Answer
D. To minimize the slushing of fuel
78
What is the name of system the lubricating oil is delivered from a separate tank to
the components by an oil pump ?
Answer
C. dry sump lubricating system
79
What is the name of part located in the engine to drive the oil pump ?
Answer
A. Cam shaft
80
What is the material is used to make oil cooler ?
Answer
B. Cast iron
81
Which of the following provides positive power transmission without slip ?
Answer
C. Chain drive
82
The speed of an induction motor is always
Answer
C. less than synchronous speed
83
Single phasing in a three-phase induction motor may result in
Answer
B. Overheating of the motor
84
Which valve permits fluid flow in only one direction ?
Answer
C. Check valve
85
Which type of pump is commonly used for handling highly corrosive chemicals ?
Answer
B. diaphragm pump
86
The primary purpose of a gland or mechanical seal in a pump is to
Answer
C. Prevent leakage of fluid along the rotating shaft
87
An isolator is operated only when the circuit is
Answer
C. No-load
88
In a substation, the isolator is generally operated
Answer
B. After the circuit breaker has opened the circuit
89
Which precaution should be followed while removing an impeller from a shaft ?
Answer
C. Use the correct puller and apply force uniformly
90
Which temperature measuring instrument works on the principle of change in
electrical resistance with temperature ?
Answer
C. Resistance Temperature Detector (RTD)
91
Which among the following is not a function of pressure relief valve in a hydraulic
system ?
Answer
C. Increases pressure to increase output from the actuator
92
Internal gear pump consists of
Answer
B. An outer rotor gear, an inner spur gear, a crescent shaped spacer and a housing
93
Which among the following is true for double acting cylinders ?
Answer
D. Both
94
In a 4/2 direction control valve
Answer
C. 4 refers to ports and 2 refers to position
95
Check valve is also known as
Answer
C. Non return valve
96
Which among the following is true for an air compressor ?
Answer
D. All of the above
97
FRL unit (filter, regulator and lubricator) is used in
Answer
C. Pneumatic systems
98
Which among the following pipe fitting is used for closing a pipeline which has an
internal thread ?
Answer
C. Plug
99
Turbine converts
Answer
D. Hydraulic energy into mechanical energy
100
The process of filling water in the suction pipe, casing and delivery pipe upto delivery
valve before starting the pump is called
Answer
B. Priming
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