| Post Name | TRADESMAN (Electrical)AW & Elecn |
|---|---|
| Department | Tech.Edn , KSWT & Sports And YA |
| Question Paper Code | 110/2022 |
| Category Code | 758/2021, 100/2022 |
| Date of Test | 8 November 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which of the following statement is/are correct about an atom?
(i) The electrons have a negative charge of 1.602 Γ 10β19 Coulomb.
(ii) The nucleus of atom consists of protons and neutrons.
(iii) The protons have a positive charge of 1.602 Γ 10β19 Coulomb.
Answer
D. All of the above (i), (ii) and (iii)
2
The Valence shell of an atom of a material is filled with four electrons. The material is known as :
Answer
A. Semiconductors
3
Which of the following process is known as Soldering?
(i) The process of joining two metal conductors without melting them.
(ii) The process of joining two metal conductors by melting them.
(iii) The process of joining two metal conductors by using the rivets.
Answer
C. (i) only
4
Which of the following soldering flux is used for soldering electrical conductors?
Answer
C. Tallow
5
Which of the following is/are the commonly available soldering flux used for soldering
Aluminium conductors?
(i) ALCAP
(ii) Ker-al-lite
(iii) Kynal flux
(iv) Eyre No. 7
Answer
B. (iii) and (iv) only
6
Which of the following method is/are used for laying underground (UG) cable?
(i) Laying direct in ground or in ducts
(ii) Laying in racks in air or in tunnel
(iii) Laying along buildings or structures
Answer
D. All of the above (i), (ii) and (iii)
7
When the operating voltages are greater than 66 KV, which type of the following cable is/are
used for electric power transmission?
Answer
B. Pressure cable
8
Which of the following substance is/are known as semiconductors?
(i) Germanium
(ii) Eureka
(iii) Ebonite
(iv) Silicon
Answer
A. (i) and (iv) only
9
Which of the following statement is/are true about UG cables?
(i) Armoring protect the cable from mechanical injuries.
(ii) Metallic sheath protect the cable from chemical attacks.
(iii) Bedding protects the armoring from corrosion.
Answer
A. (i) and (ii) only
10
Which of the following wire joint is used in OH lines for tapping the electric supply
perpendicular to the service lines?
Answer
B. Britannia tee joint
11
Which of the following law states that the resistance of a wire is directly proportional to its
length and inversely proportional to its area of cross section at constant resistivity of the
material of the wire?
Answer
D. Laws of Resistance
12
What will be the current flowing through each resistors when a 100 Ξ© and 50 Ξ© resistors are
connected in series across a 300 V DC supply?
Answer
A. 2 A flowing through both resistors
13
Which of the following statement is/are correct about Kirchhoffβs Laws?
(i) The sum of incoming current at a junction is equal to the sum of outgoing current from
that junction.
(ii) The sum of voltage drops in a closed circuit is equal to the voltage applied to the circuit.
(iii) Current flowing through a closed resistive circuit is always equal to the voltage applied
to the circuit.
Answer
C. (i) and (ii) only
14
Which of the following statement is/are correct about resistance of pure metallic conductors?
(i) Resistance increases with the increase in temperature.
(ii) Resistance decreases with the decrease in temperature.
(iii) Resistance decreases with the increase in area of cross section.
(iv) Resistance increases with the increase in area of cross section.
Answer
B. (i) and (iii) only
15
If ten numbers of 200 ohm resistors are connected in parallel across a 12 V dc supply. What
will be the effective resistance appeared across the supply?
Answer
D. 20 Ohm
A 5 110/2022
16
The mass of a substance liberated or deposited during electrolysis by one coulomb of
electricity is termed as :
Answer
C. Electro chemical equivalent
17
Which of the following statement is/are correct about a Dry cell?
(i) The chemical reaction between the electrodes and the electrolyte produces a voltage.
(ii) The dry cells must not be always operated in an upright position.
(iii) The cells have vents to escape gases generated during charge/discharge.
Answer
A. (i) and (ii) only
18
The bending of electrodes in a lead acid cell due to overcharging is known as :
Answer
D. Buckling
19
Which of the following Cell in which the chemical reaction that occurs during discharge is not
reversed?
Answer
C. Carbon-zinc cell
20
A battery operated electric bike requires 48 V, 100 Ah battery pack. The cell rated 1.2 V, 2 Ah
is available. Choose a suitable combination from the following to make the battery pack :
Answer
B. 50 parallel rows with 40 cells in series
21
What is the capacitance of a capacitor if 10 V is applied to it and store a charge of
10 Coulomb?
Answer
A. 1 Farad
22
Which of the following statement is/are correct about the Capacitive reactance?
(i) The opposition offered to the flow of alternating current by a capacitor.
(ii) Capacitive reactance is inversely proportional to the frequency of supply voltage.
(iii) Capacitive reactance is directly proportional to the capacitance of the capacitor.
Answer
A. (i) and (ii) only
23
Which of the following is a polarized capacitor?
Answer
C. Tantalum capacitor
24
A circuit consists of two capacitors of 10 micro farad each are connected in series across a
20 V supply. How much charge is stored in the circuit?
Answer
B. 100 micro coulomb
25
Which of the following law states that the back EMF has a polarity, which opposes the force
that created it?
Answer
A. Lenzβs Law
26
An inductor of 1 Henry is connected to a 100 V, 50 Hz, AC supply. What is the value of
reactance that offered by the inductor?
Answer
C. 314 Ξ©
27
Which of the following expression gives the amount of energy stored in an Inductor?
Answer
B. 0.5 LI2
28
Which of the following factor determines the polarity of the electromagnet?
Answer
D. Direction of Current
A 7 110/2022
29
Which of the following material is a Paramagnetic material?
Answer
C. Aluminium
30
Which of the following rule is used to determine the direction of mechanical force experienced
by a current carrying conductor placed in a magnetic field?
Answer
A. Flemingβs left hand rule
31
Which of the following statements, is not necessarily valid for alternating current?
Answer
C. is suitable for charging batteries
32
In ac circuit, from the following elements the power consumed in :
(i) Inductance
(ii) Capacitance
(iii) Resistance
Answer
D. (iii) only
33
The insulating material of the cable should have :
Answer
D. all of the above
34
If the supply frequency changes from 50 Hz to 100 Hz. keeping the voltage constant, the
current flowing through the coil, having negligible resistance and high inductive reactance :
Answer
B. become half
35
Choose the most suitable answer from the following statement, to improve the power factor of
a system.
(i) use only the resistive load
(ii) run the motor with the full load
(iii) use capacitive bank
(iv) all of the above
Answer
D. (iii) only
36
Why AC is required to measure the earth resistance by using earth resistance tester?
Answer
A. Avoid electrolytic emf interference
37
Which type of wiring system is suitable for multistoried building?
Answer
C. Distribution board system
38
What is the permissible leakage current in any wiring installation as per IE rule?
Answer
C. Not exceed 1/5000th part of full load current
39
Which type test is to be carried out to check whether the switches are connected in live wire
or not?
Answer
B. Polarity test
40
Which is the minimum clearance between the bottom point of the ceiling fan and the floor as
per IE Rule?
Answer
C. 2.4 m
41
What will happen, if shunt field resistance is too large?
Answer
A. Fails to build up voltage
42
How load is shifted from one generator to other when DC generators are operating in
parallel?
Answer
D. Adjusting excitation
43
Which of the following generator does not build up voltage if load is not connected?
Answer
A. Series generator
44
Which motor is used in heavy construction trucks?
Answer
D. DC series motor
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 type of DC generator is used for long distance distribution lines?
Answer
D. Cumulative compound generator
47
Which speed control methods offers below normal speed in DC shunt motor?
Answer
C. Armature control method
48
How to obtain opposite polarity in adjacent poles of a 4 pole DC motor?
Answer
D. Making current flow in different direction
49
In any DC generator the emf generated in the armature is maximum, when the :
Answer
B. rate of change of flux linkage is maximum
50
What happens when the supply terminals of a D.C shunt motor are interchanged?
Answer
C. The motor will run at its normal speed in the same direction as before
51
For starting a slipring induction motor ββββββ starter is used.
Answer
B. Rotor resistance starter
52
The speed of rotor of an induction motor is :
Answer
C. Less than synchronous speed
53
The synchronous speed of a 4 pole motor at 50 Hz can be :
Answer
A. 1500 RPM
54
Thermal overload relays are βββββββββββββ than magnetic overload relays.
Answer
B. slower
55
The purpose of back up fuse is to provide protection against :
Answer
D. Short-circuit
56
When the rotor is stationary the frequency of rotor current is :
Answer
A. Same as supply frequency
57
The fractional slip of an induction motor is the ratio :
Answer
A. rotor cu loss/rotor input
58
If starting winding of a single phase induction motor is left in the circuit, it will :
Answer
C. draw excessive current
59
Which of the following motor operate on AC and DC supply?
Answer
A. Universal motor
60
If a single phase induction motor runs slower than normal, the more likely defect is :
Answer
D. worn bearing
61
For the range extension of DC ammeter ββββββ is used.
Answer
C. Shunt
62
A Transformer transforms :
Answer
B. Voltage
63
The transformer oil used in a transformer provides :
(i) Cooling and insulation
(ii) Insulation and conduction
(iii) Cooling and lubrication
(iv) Insulation and cooling
Answer
B. Both (i) and (iv)
64
Which of the following is incorrect?
(i) Megger β for checking insulation resistance.
(ii) Lux meter β measure the amount of amplitude in a work space.
(iii) Clamp meter β resistance.
(iv) Tachometer β revolution per minute.
Answer
D. Both (ii) and (iii)
65
Energy meter can be classified as ββββββββββ instrument.
Answer
D. integrating instrument
66
The most efficient form of damping used in electrical instrument is :
Answer
C. eddy current damping
67
The starting torque of shaded pole motor is :
Answer
A. low
68
The rotor of a split phase motor receives its power from :
Answer
B. magnetic induction
69
The principle of operation of auto transformer is :
Answer
B. self induction
70
A capacitor-start single phase motor will usually have a P.F of :
Answer
C. 0.8 lagging
71
The mean of the candle power of a light source in all direction above or below the horizontal
plane is called as :
Answer
B. Mean Hemispherical Candle Power
72
The outer tube of a high pressure metal halide lamp is made of borosilicate glass. Select the
correct reason from the list :
Answer
D. Reduce the ultra violet radiation from the lamp
73
Which type of material is used in LED to get green light?
Answer
Question Cancelled
74
As per IE standards, what should be the insulation resistance between the body of the water
heater and the connecting cable?
Answer
D. 1.00 Mega Ohm
110/2022 14 A
75
From the given list, which is used as the heating unit of an electrical kettle?
Answer
C. Concealed wire in metal tube
76
What is produced by doping silicon with arsenic?
Answer
A. N-type semiconductor
77
The conductivity of semiconductors is increased by adding impurities with pure
semiconductor material. How many electrons in an atom of donor impurity?
Answer
C. 5
78
In the following special purpose diode, which is formed by metal and semiconductor?
Answer
A. Schottky diode
79
The ripple factor of a power supply is a measure of :
Answer
A. Filter efficiency
80
In a normal transistor circuit, the proper biasing is :
Answer
D. Emitter Base junction is forward, Collector Base junction is reverse
81
From the given list of generating stations, which has low running cost?
Answer
B. Hydro
82
Which of the following is generally used as a moderator in nuclear power plants?
Answer
Question Cancelled
83
From the given list choose the correct group of conventional energy sources :
Answer
C. Oil, Natural gas, Firewood
84
Biogas is a mixture of :
Answer
D. Methane and Carbon dioxide
85
Arrange the following from smallest to largest in a photo voltaic system (PV system) :
(i) Module
(ii) Array
(iii) Solar cell
(iv) Array field
Answer
B. (iii)-(i)-(ii)-(iv)
86
The knowledge of diversity factor helps in determining :
Answer
A. Plant capacity
87
Which of the following places is not associated with nuclear power plants in India?
Answer
C. Bangalore
88
A penstock is used as a conduit between :
Answer
B. A dam and turbine in hydro station
89
Wind energy is harnessed by using :
Answer
C. Turbine generator
90
A diesel generating plant running on 400V, 50 Hz, three phase low tension (LT) supply for
10 hours. The load comprises lighting load of 2.5 KW @0.9 power factor lagging on βRβ phase,
a heater load of 5KW @UPF on βYβ phase and a three phase SCIM drawing 5KW @0.8 power
factor lagging. What is the total energy consumption by the load?
Answer
A. 125 units
91
Cables used for 33 KV to 60 KV underground services are :
Answer
B. Extra high tension cables
92
As per Indian Electricity rule in overhead system, the recommended span length for RCC
poles is :
Answer
C. 80 β 100 meters
93
From the given list find the insulator used for distribution lines up to 33 KV is :
(i) Pin insulator
(ii) Reel insulator
(iii) Post insulator
(iv) Strain insulator
Answer
A. Only (i) & (iv)
94
The cause for current in a transmission line under no load condition is due to :
Answer
C. Capacitance of line
95
Which compensation is required for improving power factor in feeder voltage controller?
Answer
B. Shunt capacitor
96
Which of the following voltage level is used in primary transmission?
Answer
D. 400 KV
97
A DC-3 wire distributor system requires how much copper as compared with a DC-2 wire
system?
Answer
D. Only 31.25%
98
What type of insulator is used at dead ends of and straight lines as suspension type for
voltages 3.3 KV and above?
Answer
C. Strain insulator
99
A uniformly loaded DC distributor is fed at both ends with equal voltages. As compared to a
similar distributor fed at one end only, the drop at the middle point is :
Answer
A. One fourth
100
In a DC 3 wire distributor using balancers and having unequal loads on the two sides :
Answer
C. Balancer connected to lightly loaded side run as a motor
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