| Post Name | Draftsman Gr II/ Overseer Gr II (Electrical) |
|---|---|
| Department | Harbour Engineering |
| Question Paper Code | 107/2022 |
| Category Code | 248/2021 |
| Date of Test | 3 November 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Power factor is given by the ratio of circuit resistance to :
(i) Impedance
(ii) Inductance
(iii) Capacitance
Answer
A. Only (i)
2
In a three phase star connected system which statement is correct?
(i) Line voltage equal to phase voltage
(ii) Line current equal to phase current
(iii) Line voltage and line current have phase difference 30Β°
Answer
B. Statement (ii)
3
In three phase measurement by Two Watt meter method, both the Watt meter having
identical reading the power factor of load would be :
Answer
D. Unity
4
The ratio of rms value to the average value in a ac circuit is :
Answer
B. Form factor
5
Which statement is correct?
(i) Reciprocal of impedance is reactance
(ii) Reciprocal of impedance is conductance
(iii) Reciprocal of impedance is admittance
(iv) Reciprocal of impedance is Q factor
Answer
C. Statement (iii)
6
In a parallel ac circuit is in resonance it :
Answer
D. Is called a rejecter circuit
7
The reciprocal of frequency in an alternating quantity is :
Answer
B. Time period
8
The amplitude factor for sinusoidal alternating voltage is :
Answer
C. 1.414
9
Higher the frequency of an ac current, ββββββ the reactance offered by a capacitor.
Answer
C. Lower
10
Rms value of a sinusoidal alternating current is ββββββ times the maximum value.
Answer
A. 0.707
11
The specific gravity of electrolyte can be measured by :
Answer
B. Hydrometer
12
The positive plate of Lead acid battery is made of :
Answer
C. Lead peroxide
13
What does a capacitor stored?
Answer
C. Charge
14
The resistance of a conductor varies inversely as :
Answer
A. Area of cross section
15
Two lamps 100 W and 60 W are connected in series across 230 V ac :
Answer
C. 60 W lamp will glow brighter
16
The unit of conductance is :
Answer
B. mho
17
In metric system 1 hp equals :
Answer
A. 735.5 W
18
The resistance between opposite faces of a unit cube of material is called :
Answer
D. resistivity
19
Two resistances 10 Ξ© are connected in parallel, the total resistance is :
Answer
C. 5 Ξ©
20
The defect that occurs in simple electric cells due to the accumulation of hydrogen gas around
the positive electrode :
Answer
B. Polarisation
21
The S.I. unit of flux density is :
Answer
B. tesla
22
Magnetic field intensity (H) can be calculated by the formula?
Answer
C. H = mmf/length of coil in metre
23
Which law states that a counter emf always oppose the force that creates it?
Answer
A. Lenzβs law
24
The imaginary line joining the two poles of magnet is known as :
Answer
D. Magnetic axis
A 5 107/2022
25
S.I. unit of magnetic reluctance is :
Answer
B. AT/Wb
26
Capacitance βCβ is calculated by the formula :
Answer
A. C = Q/V
27
Capacitors are connected in parallel to obtain :
Answer
B. Higher capacitance value
28
Unit of capacitive reactance is :
Answer
C. Ohm
29
Capacitance of a capacitor is increased by :
Answer
B. Decreasing distance between plates
30
What is the unit of electric charge?
Answer
C. Coulomb
31
When compared to copper, aluminium has ββββββ percentage conductivity.
Answer
A. 60.60%
32
Which of the following is used as an insulating oil in transformer?
Answer
D. All of them
33
For temperature above 600Β°C mica is mixed with shellac or resin adhesive, it is known as :
Answer
C. Micanite
34
In ACSR conductor the function of steel is to :
Answer
A. provide additional mechanical strength
35
Porcelain is used as an insulator in :
Answer
D. All of them
36
To make soft rubber hard, 5% ββββββ is added to it.
Answer
B. sulphur
37
The melting point of tungsten is :
Answer
Question Cancelled
38
Which insulation prepared chemically to insulate the winding wires?
Answer
C. Enamel
39
Which insulating material is used for making electrical accessories such as switches, wall
socket, ceiling roses and holders?
Answer
B. Bakelite
40
Aluminium has a specific gravity of :
Answer
C. 2.7
41
Which force is required to move the pointer from zero position in an indicating instrument?
Answer
B. Deflecting force
42
What is the reason for the moving coil meter having uniform scale?
Answer
A. Deflecting torque is directly proportional to the current
43
Which error if the energy meter disc rotating continuously on no load?
Answer
D. Creeping error
44
Which material is used to make control spring in measuring instruments?
Answer
C. Phosphor bronze
45
Which electrical effect single phase energy meter works?
Answer
B. Induction effect
46
Which instrument is example for an integrating instrument?
Answer
C. Energy meter
47
Which is an absolute instrument?
Answer
D. Tangent galvanometer
48
Which position an instrument using gravity control reads accurately?
Answer
B. Vertical position
49
Which quantity is measured by a electro dynamo type instrument?
Answer
Question Cancelled
50
How the creeping error is controlled in energy meter?
Answer
D. By drilling two holes diametrically opposite on disc
51
Which type of transformer is used for high frequency applications?
Answer
Question Cancelled
52
The efficiency of a transformer lies in the range of :
Answer
C. 92β99%
53
Transformer cores are made of silicon steel with a composition of :
Answer
A. Steel 97% Silicon 3%
54
In a shell type transformer, the low voltage winding is located closure to the core and higher
voltage winding is wound on top of the lower voltage winding. This arrangement is made to :
Answer
D. Minimise insulation
55
The turns ratio of an isolation transformer is always :
Answer
C. Equal to one
56
The short circuit test of a transformer is conducted to find :
Answer
A. Copper loss
57
The transformer lamination are insulated from each other using :
Answer
D. Paper or Varnish
58
What is the condition for obtaining maximum efficiency from transformer?
Answer
C. Copper loss = Iron loss
59
Natural air cooling method of transformer cooling is generally adopted for a distribution
transformer upto :
Answer
B. 100 kVA
60
Which of the following is not desired for a transformer oil?
Answer
A. High inflammable
61
The ratio of maximum load which could be drawn to the rated capacity of system is known
as :
Answer
C. Utility factor
62
Clearance from ground for the lowest conductor in low and medium voltage transmission is :
Answer
B. 5.486 m
63
A coupling capacitor is used in substation for :
Answer
D. Communication
64
Ebb method is used to obtain power from :
Answer
A. Tidal power station
65
For an ACSR conductor the size of binding wire should not be less than :
Answer
Question Cancelled
66
A low load factor indicates :
Answer
A. There is no strain on the system
67
Which of the following is/are true about corona?
Answer
D. All of these
68
The standard length of busbar section available for 200 Ampere is :
Answer
D. 3.65 m
69
The runner of Kaplan turbine receives water :
Answer
A. Axially
70
Factors affecting corona :
Answer
B. Line voltage
71
Which type of accessories of fuse is comes under?
Answer
C. Safety accessories
72
Which is the advantage of cleat wiring system?
Answer
A. Easy to locate fault in the wiring
73
A switch board must be placed at a height of ββββββ above the ground level.
Answer
B. 1.5 m
74
The commonly used switch used to control a lamp from three places is :
Answer
A. Intermediate switch
75
The load on a power sub circuit should not exceed ββββββ Watts and number of points
should not exceed ββββββ points.
Answer
A. 3000 W, 2 points
76
A building has four ceiling fan (100 W each), one heater (1000 W) and 5 LED (15 W each) find
the total load?
Answer
B. 1475 W
77
The best suited MCB category for motor protection is :
Answer
A. βGβ series MCB
78
The atmospheric air entering the transformer is made moisture free by passing it through
equipment called :
Answer
B. Breather
79
Transformer ratings are usually expressed in terms of :
Answer
D. Kilo Volt ampere
80
The device which break the circuit at the time of earth fault :
Answer
C. RCCB
81
Which of the following factor affecting the choice of wiring?
Answer
D. All of the above
107/2022 12 A
82
Insulation resistance is measured in :
Answer
A. Mega Ohms
83
The speed of a DC Motor is :
Answer
B. Directly proportional to back EMF
84
Why starters are required to start DC motors in industries?
Answer
B. Reduce the armature current
85
The direction of induced EMF in the armature conductors of a DC generator can be
determined using :
Answer
A. Flemings Right hand rule
86
Commutator segments are made of :
Answer
A. Copper
87
Which of the following motor has high starting Torque?
Answer
B. DC series motor
88
Voltage equation of a DC motor is:
Answer
A. V = E_b + I_aR_a
89
The motor used in a mixer grinder is :
Answer
D. Universal motor
90
The difference between the Synchronous speed and the actual speed of an induction motor is
known as :
Answer
C. Slip
91
Which starter will give better starting torque?
Answer
A. Rotor resistance starter
92
In DC Machines, when maximum efficiency occurs?
Answer
A. Variable loss equal to constant loss
93
Number of parallel paths in lap winding is equal to :
Answer
B. No. of poles
94
In film projector, the lamp used is :
Answer
B. Arc lamp
95
In offices and workshops double tube is used. It is to :
Answer
D. Avoid stroboscopic effect
96
The cable which connects the distributor to the consumers terminal is called :
Answer
B. Service mains
97
The expansion of LED :
Answer
C. Light Emitting Diode
98
Which type of DC motor is used for sudden application of heavy loads?
Answer
D. Cumulative compound motor
99
The motor used in ceiling fan is :
Answer
D. Permanent capacitor motor
100
Mercury vapour lamp gives light of :
Answer
B. Greenish-blue colour
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