| Post Name | ELECTRICIAN |
|---|---|
| Department | STATE WATER TRANSPORT |
| Question Paper Code | 035/2016 |
| Date of Test | 25 February 2016 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Arc heating occurs when the air between electrodes of opposite polarity becomes :
Answer
C. Tonized
2
The meter used to measure the temperature of a furnace is:
Answer
B. pyrometer
3
Which part is provided in a battery charger to prevent the flow of excessive current into the
battery? "
|
Answer
C. Limiting resistance
4
What will happen to the filter circuit in battery charger if the output filter capacitor is
| opened? ;
|
Answer
B. Will make humming noise
|
5
What are the two relative quantities to be plotted for external characteristics curve for
DC shunt generator?
Answer
C. Load current Vs Terminal voltage
6
What will happen to a self excited DC generator, if the generator runs in reverse direction? k
|
Answer
D. Residual magnetism in the pole will be destroyed
7
Which is the application of delayed response type diazed fuse?
Answer
A. Motor circuits
8
The force between two long parallel conductors is inversely proportional to :
Answer
B. distance between the conductors
9
Which of the following circuit elements will oppose the change in the circuit current?
Answer
A. Inductance
10
The colour of light of mercury vapour lamp is :
Answer
A. Greenish blue
11
Which of the following frequencies has the longest time period?
Answer
A. 1Hz
12
Ina generator maximum value of e.m.f. is generated within the coil axis is at :
Answer
B. 90° with field axis ;
13
Achoke coil of an operating fluorescent lamp is short-circuited. What is the consequence?
Answer
C. The current becomes so large that it damages the tube
14
Acontactor coil is designed for 220V DC. What happens if it is connected to 220 V AC?
Answer
B. Too small a current is drawn by the coil and the operation of the contactor is no
longer certain
15
A capacitor is connected across a 200 V AC line, Its minimum voltage rating should be ;
Answer
C. 300 volt
16
The power factor of 3-phase load is less than 0.5. While measuring power by two
watt meters : '
Answer
Question Cancelled
17
Voltage required to operate the Neon sign tubes depends upon :
Answer
C. Length of the tube
18
Soldering of a Britannia joint is a necessity to avoid loosening of the joint due to :
Answer
A. Vibrations and change in atmospheric temperature
19
The testing of wiring installation for insulation resistance to ensure that : |
Answer
C. Leakage current beyond the stipulated value does not flow to earth
20
- Braking torque in energy meter is produced to :
|
Answer
D. Maintain steady speed and equal to driving torque |
21
The scale of dynamometer type wattmeter is of : |
A
Answer
A. Uniform scale
22
The standard secondary voltage for a PT used in power system in :
Answer
D. 110V
23
Which instrument always indicates true r.m.s. value irrespective of the waveform?
Answer
C. Thermocouple meter
24
A voltmeter gives inaccurate reading to measure the drop across a low resistance because :
Answer
C. The sensitivity of the meter is too low
25
The phase difference between the currents in the two pressure coils in PF meter is :
Answer
D. Exactly 90°
26
When a rewound armature is rolled on the surface of a leveled surface plate the armature
. stops at the same position of its periphery for each rolling, the portion of armature touching
the surface plate is regarded to have :
Answer
A. higher weight than the diametrically opposite portion
27
Which one of the following characteristic is NOT applicable to synchronous motors?
Answer
B. Suitable to supply only mechanical load
28
Which method is generally adopted to measure the power in a three phase imbalanced load
system?
b
Answer
B. Two wattmeter method
29
The colour of light depends upon : |
Answer
D. Frequency and wave length
30
Which of the following lamp is a cold cathode lamp?
Answer
A. Neon lamp
31
You have to repair storage type water heater which has steam in the hot water. The possible i
remedy for this trouble can be found by checking :
Answer
B. The thermostat setting
32
The reading on a 3 digit millivoltmeter started flashing continuously when connected across
a resistor to measure the mV across it. The reason for flashing of display on millivoltmeter is
that : ,
Answer
C. The measured value is over range .
33
Which one of the following measurement CANNOT be done with multimeter?
Answer
D. Insulation resistance of motor
34
Why a higher capacity squirrel cage induction motor is not recommended for operating under
low load condition? ;
Answer
B. Power factor will be less
35
Shunts and multipliers used in MC instruments are made up of Mangnin. The reason for
using the above metal is that, it has : ;
Answer
D. Very low (practically constant) temperature co-efficient of resistance
36
In order to operate a fluorescent tube set on DC supply, which of the following additional
auxiliary device is to be connected?
Answer
C. Resistance
37
The power input increases by three times when the connection of three phase loads changes
from star to delta at the same line voltage. What is the reason for this?
Answer
C. The line current is three times higher in delta connection than in star connection
38
Ina parallel resonant circuit the capacitor current is : ‘
Answer
A. More than line current
39
According to National electric code what is the specified minimum distance between the
washing unit and the switch board :
Answer
C. 2.5 metre
40
Answer
C. Less than resonant frequency
41
In the output voltage of a DC generator the ripple effects can be reduced by increasing the :
Answer
B. Number of armature coil,
42
While installing power sub-circuits in domestic installations it should be restricted to :
Answer
D. 3000 watts within 2 outlets ‘ ,
43
What type of compounding would be desirable in the DC generator feeding a long
transmission line?
Answer
A. Over compounding
44
The most economic method of electrical braking is :
Answer
C. Regenerative braking
|
45
When a DC series motor is connected to an AC supply, then : phe
|
Answer
D. It will run with less efficiency and high spark at commutator
46
Dummy coils in a DC generator is provided :
Answer
D. To provide mechanical balance to the rotor
47
When the number of poles and the number of armature conductors are fixed, then which
winding of a DC generator will give the higher e.m.f.?
Answer
A. Wave winding
48
Earth tester is used for measuring earth resistance in which generated DC is converted into
AC by current reverser. The reason for using AC supply for resistance measurement is:
Answer
B. To reduce error due to electrolytic e.m.f.
49
‘The basic function of voltage stabilizer is to provide :
Answer
C. Constant voltage supply to load
50
A food mixture rated for 240 V AC fails to start when it is switched on. Which one of the |
following is NOT a cause for the above?
Answer
B. Supply voltage is only 210 V
51
Ina transformer the leakage flux may be minimized by :
Answer
B. Sectionalizing and interleaving the primary and secondary winding
52
Which one of the following connections is preferred for three-to-two phase conversion?
Answer
A. Scott
53
‘The phase relationship between primary and secondary terminal voltage of a transformer is :
Answer
C. 180° out of phase
54
The no load primary current Io in an ideal transformer is:
Answer
C. Lage behind V: by 90°
;
55
An optocoupler is a single package of :
Answer
B. LED and a photodiode
56
One of the diode of a bridge rectifier connected to 100 V 50 Hz AC input is found to be
damaged. The DC output of the circuit is 90 V. The minimum value of PIV of the diode
required for replacement is :
Answer
C. 100V
57
You are working with a fully automatic star delta starter. You notice that when start switch
| is pressed the motor starts in star but does not change to delta. The trouble will be in :
Answer
B. Timer and its circuit
58
Watt-hour meter is classified as
Answer
D. Integrating instrument
59
Two pin sockets should not be used in domestic wiring unless the appliance to be connected k
is:
Answer
B. Double insulated
60
As load on induction motor increases its power factor :
Answer
D. Goes on increasing up to full load and then it falls again .
61
During no load test of a 3 phase induction motor, the motor draws power :
Answer
C. For core loss and windage-friction loss
62
The recent method of smooth speed control of a three-phase induction motor over a wide
range is: :
Answer
A. Frequency control method
63
Rotor bars of squirrel cage rotor are sometimes skewed : ©
Answer
D. Due to all above reasons
035/2016 10 A
64
For 66 kV lines the number of insulator dises used is :
Answer
B. 6
65
AC resistance of a line conductor is more than its DC resistance because of :
Answer
C. Skin effect and proximity effect
66
What type of insulator will be used if the direction of the transmission line is changed?
Answer
Question Cancelled
67
The back emf set up in the armature of a synchronous motor depends on :
Answer
B. Rotor excitation only
68
The current drawn by an over excited synchronous motor will be :
Answer
C. At leading power factor
69
Two alternators are sharing an inductive toad equally. What will be happened if the
| excitation of one alternator is increased?
|
Answer
B. Another alternator will deliver less current
70
Aceiling fan rotates slowly in either direction. The probable fault is :
Answer
B. An open in capacitor
71
In repulsion motor, maximum torque is developed when :
Answer
C. Brush axis is at 45° electrical to the field axis
72
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by
means of
Answer
B. Magnetic relay
73
How the speed control of universal motor used for sewing machine is done?
Answer
D. Introducing a variable resistance in series with the motor
74
Buchholz relay is operated by :
Answer
A. Gas pressure
75
The size of earth wire is determined by :
Answer
C. the current capacity of the service wires
76
Earthing in consumer premises is necessary to give protection against ;
Answer
B. Danger of electric shock
77
Asingle phase protection switch is used to protect :
Answer
C. The motor from the damage due to single phasing
78
The best location of the power factor improving device to be installed in the transmission line
is at:
Answer
A. The receiving end
79
———————— motor has series characteristics.
Answer
C. Repulsion motor
80
How the light output is produced in electric discharge lamp?
Answer
C. By ionisation in a gas or vapour
81
A social Reformer of Kerala who started Atmavidhya Sangham was :
Answer
D. Vagbhadanandan
035/2016 12 A
82
“The Career and legend of VascodaGama” is a book written by :
Answer
A. Sanjay Subramaniyam
83
Who among the foreign travellers made earliest reference regarding Kerala?
Answer
B. Megasthanese
84
The Newspaper “Sujananandini” was started by :
Answer
C. Kesavan Asan
85
Under 42> amendment to our constitution the fundamental duties were enumerated This
- concept of fundamental duties was borrowed from the constitution of : |
1
Answer
A. USSR
86
The Rajya Sabha is a body.
Answer
C. a permanent body
87
Article 368 deals with :
Answer
D. Amendment of the Constitution
88
“Neel Darpan” is a play which portrays the oppression meted out by the indigo planters over
the peasants. This famous Play was written by whom?
Answer
B. Dinbandhu Mitra
89
Which of the following is one of the Harappan sites related to the maritime activities of the
Harappan people?
:
Answer
A. Lothal
90
‘The cold current which meets with the warm gulf stream near Newfoundland?
|
Answer
D. Labrador
| A iB 035/2016
| [P.T.0.]
|
91
South Africa was captured by Britain after the —---————- war.
Answer
B. Boer war ;
92
The King of England during the American war of independence :
Answer
A. George III
93
The classical dance form popular in the North-East parts of India :
Answer
C. Manipuri
94
The author of the famous book “Fidelio” : :
Answer
B. L. Beethoven
95
The Headquarters of Economie and Social Commission for Asia and the Pacific (ESCAP) is at :
Answer
D. Bangkok
96
Language in which maximum number of Newspapers are published?
Answer
C. Hindi
97
French official book :
Answer
A. Yellow book
98
The author of “Truth, Love and a Little Malice” :
Answer
D. Khushwant Singh
99
Who was the founder of Scientific Astronomy?
|
Answer
Question Cancelled
100
Who propounded the signs of the Zodiac?
Answer
C. Babylonians
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