| Post Name | Operator - By Transfer - Kerala Water Authority |
|---|---|
| Question Paper Code | 048/2025/OL |
| Category Code | 195/2024 |
| Date of Test | 31 May 2025 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
From the following material which has nearly zero temperature coefficient ?
Answer
C. Manganin
2
Heater coils are made from
Answer
D. Nichrome
3
The resistance of an insulator on increasing the temperature
Answer
A. Decreases
4
One British H.P. equal to
Answer
C. 746 watts
5
The unit of reluctance is
Answer
B. Ampere turn/Weber
6
In electrical machines laminated cores are used for reducing
Answer
C. Eddy current loss
7
In transformer, open circuit test are used to find out
Answer
B. Iron loss
8
Which of the following relay used to find out internal fault in transformer ?
Answer
D. Buchholz relay
9
Which of the following gives best indication of a fully charged lead acid battery ?
Answer
A. Specific gravity
10
What is the benefits of using SMF batteries ?
Answer
D. Less maintenance and spill-proof
11
Shunt is used for the range extension of
Answer
A. DC ammeter
12
Which of the following is a good conductor ?
Answer
B. Graphite
13
The transformer oil used in a transformer provides
Answer
D. Insulation and cooling
14
Which of the following is correct ? 1. Megger-for checking insulation resistance 2. Wattmeter-for measuring energy 3. Ampere hour meter-resistance 4. Tachometer-revolution per minute
Answer
B. Both 4 and 1
15
Which of the following bearing used in measuring instrument ?
Answer
D. Jewel bearing
16
Which of the following is a diamagnetic substance ?
Answer
D. Bismuth
17
Conductance is analogous to
Answer
A. Permeance
18
Good insulating materials have
Answer
A. High dielectric strength
19
Which of the following shows negative temperature coefficient of resistance ?
Answer
B. Thermistor
20
When the distance between the plates of a capacitor increases its capacitance
Answer
C. Decreases
21
The unit of inductive reactance in AC circuit is
Answer
C. Ohms
22
The value of form factor for a sinusoidal alternating current is
Answer
D. 1.11
23
The reciprocal of impedence in an alternating current circuit is
Answer
B. Admittance
24
In three phase supply the reactive power is given by
Answer
A. √3 Vₗ Iₗ sin θ
25
The relation of current in Delta connection is
Answer
B. Iₗ=√3 Iₚₕ
26
The colour used for mandatory sign is
Answer
A. White symbol on blue background
27
The type fire extinguishers use for class 'B' type fire
Answer
C. Carbon dioxide fire extinguishers
28
The electro chemical equivalent of silver is
Answer
D. 1.118
29
The electrolyte used in a lead acid cell is
Answer
A. Sulphuric acid
30
For obtaining a higher output current which connection is suitable for batteries ?
Answer
B. Parallel connection
31
In two wattmeter method for three phase power measurement one of the wattmeter reading is zero then power factor is
Answer
C. 0.5
32
Moving coil instrument is used in which type supply ?
Answer
D. DC
33
The material used for spiral hair springs in spring control instrument is
Answer
A. Beryllium-copper
34
The major cause for creeping in energy meter is
Answer
B. Over friction compensation
35
Energymeter belongs to which type instruments ?
Answer
C. Integrating Instruments
36
In generating stations and sub stations which type of earthing is preferred ?
Answer
D. Plate earthing
37
For stair case wiring the type of switch used is
Answer
B. Two way switch
38
The switch which is called as snap switch is
Answer
A. Toggle switch
39
The type of MCB used for motor protection is
Answer
B. G series MCB
40
The type of wiring used for temporary installations is
Answer
C. Cleat wiring
41
How to determine copper loss in a transformer ?
Answer
B. Short circuit test
42
Which rule is used to find the direction of induced emf in D.C. generator ?
Answer
C. Fleming's right hand rule
43
How many parallel paths in duplex lap winding of a 4 pole DC generator ?
Answer
A. 8
44
What is the formula to calculate back EMF in a DC motor ?
Answer
D. Eb = ΦZNP/60A
45
Why the holding coil of a 3 point starter is connected in series with shunt field ?
Answer
B. To protect the motor from high speed
46
Which speed control system provides a smooth variation of speed from zero to above normal ?
Answer
C. Field control
47
Which loss is determined by no load test of 3 phase induction motor ?
Answer
D. Iron loss
48
What is the function of centrifugal switch in single phase motors ?
Answer
A. Break the starting winding
49
What is the formula to calculate emf equation of an alternator ?
Answer
B. E = 4.44 Kd Kc FT Φm
50
What is the function of damper windings in synchronous motor ?
Answer
D. Start the synchronous motor
51
What is the number of flip-flops required in a decade counter ?
Answer
D. 4
52
Which IC is used for the function of 4 bit shift register ?
Answer
B. IC 7495
53
The number of comparisons carried out in a 4-bit flash type A/D converter is
Answer
A. 15
54
An Exclusive OR gate produces high output only when two inputs are
Answer
C. Different
55
What is the octal equivalent of the Hexadecimal number ?
Answer
B. 125715
56
The device commonly used for triggering a TRIAC is
Answer
D. DIAC
57
The number of layers in a thyristor (SCR) is
Answer
C. 4
58
If Vₘ is the peak AC voltage of secondary of the transformer in bridge rectifier then PIV rating per diode is
Answer
B. Vₘ
59
Which of the following diode used as voltage regulator in power supply ?
Answer
C. Zener diode
60
Which is equal to the ratio of the real power to the apparent power ?
Answer
D. Power factor
61
Which statement is correct about the classification of pump according to the base on the principle of operation ? i. Centrifugal pump ii. Displacement pump iii. Stem engine pump iv. Rotary pump
Answer
C. i, ii
62
In centrifugal pump, the suction head is generally limited to ______ meter.
Answer
B. 7.90 m
63
In submersible pump, the bore holes are made for diameters from _____ to _____
Answer
A. 10 to 35 cm
64
Which type of set screw is used against a shaft that has been spotted to receive it ?
Answer
C. Oval point set screw
65
Which type of lock nut have a slot is cut half way across the nut ?
Answer
D. Sawn nut
66
Choose the correct statement about sheet metal. 1. Lead sheet a. Used in diaries, food processing 2. Stainless sheet b. Used for making acid tank 3. Aluminium sheet c. Used for making buckets, furnaces 4. Galvanized iron sheet d. Used for making house hold appliances
Answer
C. 1-b, 2-a, 3-d, 4-c
67
Which type of rivets are used for joining chains in place of pins ?
Answer
D. Bifurcated rivet
68
Which statement is correct about solder ? a. Solder has relatively high tensile strength b. Soldering is used to join surfaces not under high strength forces c. Most soft solders are alloy of tin and zinc d. The solder melt at temperature higher than 427°C
Answer
B. b only
69
The minimum distance from a rivet hole centre to the nearest edge of the plate is called
Answer
D. Margin
70
What is used for bending and folding edges on a metal ?
Answer
C. Brake
71
How can we identify a four stroke engine ?
Answer
A. Valves
72
What is the volume of the space above the piston at TDC ?
Answer
B. Clearance volume
73
Which is the compression pressure of C.I. engine ?
Answer
C. 290 to 390 psi
74
What is the process of driving exhaust gases in two stroke engine out of cylinder ?
Answer
D. Scavemgimg
75
What is the working cycle of compression ignition engine ?
Answer
A. Diesel cycle
76
Which is the starting system used in heavy vehicles ?
Answer
D. Electric motor cranking
77
What is indicated horse power ?
Answer
C. Power developed in the cylinder
78
The ratio between BHP and IHP is called
Answer
B. Mechanical efficiency
79
Which type of oil pump takes drive from engine crank shaft ?
Answer
D. Crescent pump
80
Which of the following is not a reason for high oil pressure ?
Answer
A. Worn out main bearing
81
Why the face of pulley is "Crowned" in power transmission ?
Answer
D. Keep the belt centralised
82
What is the purpose of jockey pulley in belt drive ?
Answer
A. To maintain the tension
83
Which starting method is the best method in induction motor ?
Answer
C. Star-Delta starting
84
Which of the following is a positive displacement pump ?
Answer
B. Reciprocating pump
85
How to adjust the tension of belt between two fixed pulleys ?
Answer
B. By fixing idler pulley
86
Which speed is called as synchronous speed in 3 phase induction motor ?
Answer
D. Rotating magnetic field speed
87
What happens to a 3 phase induction motor if one phase fails during running ?
Answer
A. Motor runs slowly, finally it burns
88
Which type of test is conducted using internal growler in AC motor winding ?
Answer
B. Short circuit test
89
What is the primary advantage of using vacuum circuit breakers in certain applications ?
Answer
C. High current interrupting capacity
90
Which of the following method is an example of direct measurement of pressure ?
Answer
D. Bourdon tube
91
Which valve block flow in one direction and allow free flow in the other direction ?
Answer
C. Non-return valve
92
Which valve is used for fine control of flow in pipe line ?
Answer
C. Needle valve
93
Which part of the single acting cylinder is attached with the load ?
Answer
A. Piston Rod
94
What is the name of the device used to remove dust, chips and other foreign particles from the fluid ?
Answer
B. Filter
95
How many number of valves are required for the rotary pump ?
Answer
D. 0
96
Which type of turbine is a Francis Turbine ?
Answer
A. Reaction turbine
97
How many types of turbines can you classify on the basis of direction of flow through runner ?
Answer
C. 4
98
How direction control valves are classified ?
Answer
B. Number of ports and position
99
Which standard pipe fitting is used to close a pipe line having internal thread ?
Answer
A. Plug
100
How pipes are classified ?
Answer
D. Material
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