| Post Name | Electrician, Overseer Gr II/ Draftsman Gr II (Electrical), Electrician Police Constable, Skilled Assistant Gr II, Tradesman (Electrical), Linemen |
|---|---|
| Department | Kerala State Water Transport, Public Works/ Irrigation, Animal Husbandry etc |
| Question Paper Code | 046/2024 |
| Category Code | 058/2023, 186/2023, 195/2023, 247/2023, 254/2023, 265/2023, 417/2023, 428/2023, 533/2023 |
| Date of Test | 30 April 2024 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which of the following statement/s is/are correct regarding electric charge ?
i. Charge is equal to current multiplied by time.
ii. The charge of an electron is equal to 1.602 × 10–19 C.
iii. Charge is equal to current divided by time.
Answer
C. Only i
2
Which of the following statement/s is/are correct regarding soldering ?
i. The main constituent elements of solder alloy are tin and lead.
ii. Silver based solders are used to carry out soldering at high temperature.
iii. Flux cannot remove dirt or grease but removes the oxide layer.
Answer
D. i, ii and iii
3
A nichrome wire of 10 cm length and 2 mm diameter has 2 W resistance. What is the
resistance if 30 cm of the same wire is used, assuming temperature to be constant ?
Answer
A. 6 W
4
Which of the following is/are unit/s of voltage ?
i. Volt
ii. Weber/sec
iii. Weber/m2
Answer
B. Only i and ii
5
Which of the following is/are reason/s for widely using copper as conductor than
silver ?
i. Copper has more conductivity than silver.
ii. Copper is cheaper than silver.
Answer
B. Only ii
6
Which of the following is/are desirable characteristic/s of insulation materials ?
i. High dielectric strength
ii. low dielectric strength
iii. Flexible
Answer
C. Only i and iii
7
Which of the following is/are correct regarding semiconductors ?
i. Semiconductors have positive temperature coefficient of resistance.
ii. Silicon, germanium and carbon are examples of semiconductor material.
iii. Valence electrons of semiconductor materials are normally 4.
Answer
Question Cancelled
8
Which of the following is/are correct regarding resistivity ?
i. The unit of resistivity is Siemens per metre.
ii. Resistivity does not depend on the size of conductor.
Answer
B. Only ii
9
If a 16 SWG wire has a cross sectional area of 2 mm2 with a current capacity of 5A,
then which of the following statement is true ?
Answer
A. An 18 SWG wire has a cross sectional area of 1 mm2 with a current rating of
2.3A
10
Which of the following factors decide the insulation thickness of an electrical cable ?
Answer
D. Voltage
11
A 12V source with an internal resistance of 1W is connected across a load of 5W.
Calculate the current through the load.
Answer
B. 2A
12
Which of the following statement/s is/are correct regarding Kirchoff’s law ?
i. Kirchoff’s current law is applicable for closed loops.
ii. Kirchoff’s current law is applicable for junctions or nodes.
iii. Kirchoff’s voltage law is applicable for closed loops.
iv. Kirchoff’s voltage law is applicable for junctions or nodes.
Answer
A. Only ii and iii
13
Which of the following effects of electric current is utilized for electroplating ?
Answer
D. Chemical effect
14
Which of the following statement/s is/are correct regarding series and parallel
connection of resistance ?
i. The effective resistance of parallel combination of resistance is smaller than
the smallest resistance in the combination.
ii. The effective resistance of parallel combination of resistance is larger than the
smallest resistance in the combination.
iii. The effective resistance of series combination of resistance is larger than the
largest resistance in the combination.
iv. The effective resistance of series combination of resistance is smaller than the
largest resistance in the combination.
Answer
B. Only i and iii
15
Which of the following is/are correct regarding Ohm’s law ?
i. It is applicable when the temperature and other physical conditions do not
change.
ii. It is not applicable to non linear devices like Zener diode.
Answer
C. Both i and ii
16
Which of the following properties are correct regarding resistance ?
i. When temperature increases, resistance of pure metals increases normally.
ii. When temperature increases, resistance of insulating materials decreases
normally.
iii. Certain alloys such as constantan shows practically no change in resistance
for considerable temperature variation.
Answer
D. i, ii and iii
17
Which of the following is/are correct regarding electrochemical cells ?
i. Wet type cells can be operated in both upright and horizontal position.
ii. Voltaic cell is an example of primary cell.
iii. lead acid battery is an example of secondary cell.
Answer
A. Only ii and iii
18
Match the following electrochemical cells with their electrolytes.
1. Carbon Zinc cell i. Ammonium chloride
2. Mercury cell ii. Sulphuric acid
3. Lead acid battery ili. Potassium Hydroxide
Answer
C. 1-i, 2-iii, 3-ii
19
4 numbers of 12 V, 80 Ah batteries are connected in series. Another 4 numbers
of series connected 12 V, 80 Ah batteries are connected parallel to the first set of
series connected batteries. What is the effective voltage and Ampere hour rating of
the arrangement ?
Answer
B. 48 V, 160 Ah
20
Which of the following statement/s is/are correct regarding maintenance of lead acid
battery ?
i. do not overcharge or discharge the battery at high rates as it might cause
buckling.
ii. The level of electrolyte should be kept below the plate level.
Answer
A. Only i
21
Which of the following statement/s is/are correct regarding magnetic materials ?
i. Ferromagnetic substances are strongly attracted by a magnet.
ii. Paramagnetic substances are slightly repelled by a magnet.
iii. diamagnetic substances are slightly attracted by a magnet.
Answer
C. Only i
22
Match the following magnetic materials and their examples :
1. Ferromagnetic material i. Iron
2. Paramagnetic material ii. Aluminium
3. Diamagnetic material iii. Bismuth
Answer
A. 1-i, 2-ii, 3-iii
23
Which of the following statement/s is/are correct regarding magnetic effect of electric
current ?
i. Greater the current through the conductor, the stronger is the magnetic field
produced.
ii. Right hand grip rule can be used to determine the direction of magnetic field
around a conductor.
iii. Magnetic field near the conductor is weak and becomes stronger as the
distance from conductor increases.
Answer
B. Only i and ii
24
Which of the following is/are unit/s of magnetic flux density ?
Answer
D. Both
25
Which of the following statement/s is/are correct regarding Fleming’s rule ?
i. Fleming’s Right Hand rule is used to determine direction of induced EmF.
ii. Fleming’s Right Hand rule is used to determine the direction of the force acting
on the current carrying conductor placed in a magnetic field.
iii. Fleming’s left Hand rule is used to determine direction of induced EmF.
iv. Fleming’s left Hand rule is used to determine the direction of the force acting
on the current carrying conductor placed in a magnetic field.
Answer
A. Only i and iv
26
Which of the following statement/s is/are correct regarding reluctance ?
i. magnetic materials like iron have high reluctance.
ii. Non-magnetic materials have high reluctance.
iii. The reciprocal of reluctance is known as permeance.
Answer
C. Only ii and iii
27
Which of the following is/are correct regarding Faraday’s laws of electromagnetic
induction ?
i. EmF is induced in a conductor when there is a relative motion between
conductor and magnetic field.
ii. EmF is induced in a conductor when it moves in a direction parallel to the
conductor.
iii. EMF is induced in a conductor when it lies in a magnetic field.
Answer
Question Cancelled
28
Which of the following factors affect the current through a capacitor ?
i. The frequency of applied voltage.
ii. The capacitance of the capacitor.
iii. The amplitude of the applied voltage.
Answer
D. i, ii and iii
29
Which of the following capacitors cannot be used in AC circuits ?
Answer
Question Cancelled
30
What is the capacitance of a capacitor that requires 1 mC to charge it to 50 V ?
Answer
B. 20 mF
31
What is the working principle of earth resistance tester ?
Answer
B. Fall of potential method
32
The instrument used to measure insulation resistance of a wiring installation
Answer
C. megger
33
In which wiring installation the system earthing is to be done ?
Answer
A. Generating stations and substations
34
What is the minimum size of copper plate used in plate earthing ?
Answer
A. 600 mm × 600 mm × 3.15 mm
35
What type of lamp holder is commonly used in studios, flood lights and head lights
for lamps over 300 watts ?
Answer
B. Goliath Edison screw type holder
36
What is the minimum value of insulation resistance of any wiring installation ?
Answer
C. 1m W
37
As per IE rules the maximum load in a power sub circuit is limited to
Answer
C. 3000 watts
38
What is the maximum leakage current in an installation as per IE rules ?
Answer
B. 1/5000 of full load current
39
What type of circuit breaker is typically used for current ratings above 100 Ampere
up to 800 Ampere ?
Answer
C. mCCB
40
The minimum area of cross section of copper conductor in power wiring is
Answer
B. 2.5 sq. mm
41
The direction of emf induced in a DC generator can be find out by which of the
following rule ?
Answer
D. Fleming’s right hand rule
42
What is the working principle of a dC generator ?
Answer
D. Faraday’s laws of electromagnetic induction
43
Calculate the emf generated in a 6 pole lap wound dC generator which has 1000
conductors driven at a speed of 1500 rpm, the flux per pole is 3 milliweber.
Answer
A. 75 Volts
44
How many parallel paths in duplex wave winding of an eight pole dC generator ?
Answer
B. 4
45
What is the function of split rings of a dC generator ?
Answer
D. To ensure constant emf direction
46
The purpose of laminating armature of a dC generator is to
Answer
D. Reduce eddy current loss
47
To reverse the direction of rotation of a compound motor without changing its
characteristics is to change the direction of current of
Answer
A. Armature
48
Which speed control method offers below normal speed in dC shunt motor ?
Answer
B. Armature control method
49
The connection of hold on coil in a three point starter of a dC shunt motor is
Answer
B. In series with shunt field
50
Which speed control method is applied to obtain both below and above normal speed
in a dC motor ?
Answer
C. Ward Leonard speed control
51
The displacement of starting and running windings of single phase induction motor
is ___________ degree electrical.
Answer
B. 90
52
Universal motor is not suitable for the following application
Answer
D. domestic pump motor
53
The rotor of a squirrel cage induction motor is short circuited by using
Answer
B. End rings
54
What is the speed of stator rotating magnetic field of 3 phase squirrel cage
induction motor ?
Answer
C. Synchronous speed
55
The number of contactors in an automatic star delta starter is
Answer
C. 3
56
__________ starter does not reduces starting current.
Answer
A. direct on line
57
Slip ring induction motor is started by using ________ starter.
Answer
C. Rotor resistance
58
The function of ferrule in panel board is to identify
Answer
B. Cable
59
The accessory used to hold and insulate the cable while passing through drilled
holes in a panel is
Answer
D. Grommet
60
The direction of rotation of a three phase squirrel cage induction motor is reversed by
Answer
C. Interchanging any two phases
61
Watt meter is a/an _________ instrument.
Answer
A. Indicating
62
Which effect of electric current is utilised in moving iron type instrument to produce
deflecting torque ?
Answer
B. magnetic
63
The material used for making springs in spring controlled instruments must have
Answer
D. All the above
64
The torque required in an indicating instrument to bring the pointer quickly to rest
in its deflected position to obtain quick and accurate reading is
Answer
C. damping torque
65
________ type instrument measures AC quantities only.
Answer
D. Induction
66
What is the working principle of two winding transformer ?
Answer
B. mutual induction
67
In a transformer, which factor remains the same when transformer action takes
place ?
Answer
C. Frequency
68
Which of the following statement is false about a transformer ?
Answer
A. The per turn induced emf of primary and secondary are different
69
In order to operate two single phase transformers in parallel which factor/factors
must be kept same ?
Answer
D. All the above
70
Transformer oil is filled in the transformer tank for
Answer
C. Cooling and insulating the windings
71
The unit of lamp efficiency is
Answer
C. lumen per watt
72
If the distance between the surface and the light source is doubled, illumination of
the surface becomes
Answer
D. One fourth
73
The function of choke in fluorescent tube light is
Answer
A. Surge voltage and limit current
74
The mercury vapour lamp gives
Answer
B. Greenish blue light
75
The sweep of the ceiling fan is determined by
Answer
C. diameter of the circle formed by the blade tip of fan
76
The knee voltage of a silicon diode is
Answer
D. 0.7
77
doping element of N-type semiconductor is
Answer
C. Antimony
78
The ripple factor of a single phase full wave bridge rectifier is
Answer
A. 0.482
79
The emitter of a transistor is _________ doped.
Answer
A. Heavily
80
In a full wave bridge rectifier, the current in each diodes flows for
Answer
B. Half cycle of the input cycle
81
Identify the non-renewable resource from the following.
Answer
B. Natural gas
82
Solar cells are made of
Answer
C. Silicon
83
Fuel used in nuclear reactors are
Answer
B. U-235
84
The power generation in a windmill depends on
Answer
A. Wind velocity
85
The principle on which solar cell works
Answer
C. Photovoltaic
86
The use of economizer in thermal power plant is
Answer
A. Heat up feed water
87
In hydro-electric power plant, the surge tank is used to
Answer
B. Relieve water hammer pressure in penstock pipe
88
What is the approximate efficiency of a typical thermal power station ?
Answer
A. 26 – 36%
89
The graphical representation of the discharge and time is known as
Answer
D. Hydro graph
90
For high head low discharge hydel power plant the water turbine used is
Answer
A. Pelton wheel
91
The copper loss in transformer can be reduced by
Answer
C. Reducing the resistance of the winding
92
Guy wire is employed for
Answer
B. Supporting the pole
93
The highest transmission voltage used in India is
Answer
D. 765 kV
94
The length of short transmission line is up to
Answer
A. 50 km
95
If the length of a single core underground cable is doubled, its capacitance
becomes
Answer
A. doubled
96
Skin effect in an AC transmission system depends on which of the following ?
i. Nature of material
ii. diameter of wire
iii. Frequency
iv. Shape of wire
Answer
D. i, ii, iii, iv
97
Back to back dC link is used to connect
Answer
C. Couple two AC system at different frequencies
98
The dC ring main distribution system is used because of
Answer
A. Good voltage regulation
99
The neutral current of balanced 3 phase 4 wire system is
Answer
A. Zero
100
Which of the following is not an advantage of a dC transmission line ?
Answer
Question Cancelled
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