| Post Name | OVERSEER (ELECTRICAL) |
|---|---|
| Department | Kerala Port Dept |
| Question Paper Code | 154/2014 |
| Date of Test | 24 September 2014 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
1 volt is equal to:
Answer
B. One joule per coulomb
2
The resistance of a conductor increases as its :
Answer
A. Cross sectional area decreases
|
3
A3 phase load is balanced, if all the 3 phases have the same :
Answer
C. impedance and power factor
4
Candela is the unit of :
Answer
D. Luminous intensity |
5
_ Kirchoff's laws are valid for : |
Answer
C. Both linear and non linear circuits
6
Ina lead acid battery, level of electrolyte should be : |
Answer
A. Above the level of plates
7
Electromagnetic torque and speed are in opposite directions in case of :
Answer
A. Shunt generators
8
If the voltage and current are out of the phase by 90°; the power is :
Answer
A. Zero
9
Neon gas in sodium vapour lamp :
Answer
C. Assists in developing enough heat to vapourize the sodium
10
Three 2 ohm resistors are connected to form a triangle. The resistance between any two
corners is :
3 4
Answer
D. 39
11
An electric bulb rated 220 V is connected to 220 V, 5Hz source, then the bulb :
Answer
C. Glows intermittently
12
A closed path made by several branches of network is known as :
Answer
D. Loop
13
An inductor stores energy in : ; ‘
Answer
D. Magnetic field
14
Lenz’s law is a consequence of the law of conservation of :
Answer
C. Energy
15
The form factor of d.c. supply voltage is always :
Answer
A. unity
16
In3 phase star connections, line voltage is same as :
1
Answer
C. 3 phase voltage
17
Damper windings are provided in synchronous machines to :
Answer
D. All of the above
18
The speed of a d.c, motor is ;
Answer
B. Directly proportional to back e.m.f
19
Which test can be used to determine the no load losses of a shunt motor ? |
Answer
C. Swinburne’s test
20
Select the wrong statement from below, which is the essential condition for parallel
operation of two or more transformers.
Answer
A. Current ratios should be same —_
21
Distribution transformers are usually designed to have maximum efficiency :
Answer
C. Near 50% of full load
22
The major disadvantage, with solar cells for power generation is :
|
Answer
D. High cost
23
The type of d.c. generator used for are welding purposes is :
Answer
D. Differentially compounded generator
24
Class H insulation is normally used in :
Answer
A. Traction motors
25
‘The increase in resistance due to non uniform distribution of current in a conductor is
known as ;
Answer
D. Skin effect
26
For moving iron instruments, which statement below is not correct ?
Answer
A. Scales of this instrument are uniform
27
In a delta connected circuit, the relationship between line and phase voltage of a delta connected circuit is given by:
Answer
A. Vₗ = Vₚ
28
In the measurement of 3 phase power by 2 wattmeter method if 2 wattmeter readings are
| equal, the power factor of the circuit is :
Answer
A. unity
29
Oil in transformer is used as :
Answer
C. Both
30
The pole and pole shoes of a synchronous machine are laminated in order to reduce :
Answer
D. Heating due to eddy currents
31
Economiser in a boiler is used to :
Answer
C. Reduce fuel consumption
32
Ina ACSR conductors, steel wire is used for :
Answer
C. Providing additional mechanical strength
33
For repetitive type projects, the mostly used network technique is :
Answer
B. CPM
34
In quality system, which is the model for quality assurance in design production,
installation and servicing ?
Answer
B. ISO 9001
35
When the relative permeability of a material is slightly less than 1, it is called
Answer
A. Diamagnetic material
36
Transportation method is :
Answer
C. Quantitative management technique
37
In induction heating, which of the following is of high value ?
Answer
C. Frequency
38
The method of heating used for non conducting material is :
|
Answer
A. Dielectric heating
39
The power factor in a transformer :
|
Answer
D. Depends on power factor of the load
40
The advantage of salient poles in an alternator is :
Answer
C. Adaptability to low and medium speed operation
41
In which of the following motors, the stator and rotor magnetic fields rotate at the same
speed :
Answer
A. Synchronous motor
42
In which method of starting a motor, the starting current is maximum ?
Answer
D. Direct online
43
One lux is same as : :
Answer
B. One lumen/sq.m
44
Which of the following materials has the highest permeability ?
Answer
A. Permalloy
45
In performing the short circuit test of a transformer :
|
Answer
B. Low-voltage side is usually short circuited
46
Ina d.c. machine, armature emf is :
Answer
C. stationary w.r.t field
47
An electric field can deflect:
Answer
C. α-particles
48
PERTis:
Answer
B. Programme evaluation and review technique
49
Mutual inductance between two coils can be decreased by : d
Answer
C. By moving the coils by apart
50
Transient currents in electrical circuits are associated with :
Answer
D. Both
51
The rotor of the salient pole alternator has 24 poles. The number of cycles of emf in one
revolution would be :
Answer
B. 12
52
The synchronous motors are not self-starting because :
Answer
C. The direction of instantaneous torque on the rotor reverses after half cycle
53
1 Tesla is the same as one :
Answer
B. Weber/ (metre)?
54
Load shading is done :
Answer
A. To reduce heat demand
55
Circular coil sections are used because they :
Answer
C. Have the strongest mechanical shape
56
Transient disturbances are due to :
Answer
D. Any of the above
57
‘The core flux in a transformer depends mainly on :
Answer
B. Supply voltage and frequency ‘
58
Ohm’s law (E=IR)
Answer
C. Can be applied to a.c. but after replacing R by Z
59
Luminous flux is :
Answer
A. Rate of energy radiation in the form of light waves
60
Ina transformer, the voltage regulation will be zero, when it is operated at :
Answer
B. leading p.f.
61
The fundamental voltage equation of a motor is expressed by:
Answer
B. V = Eb + IaRa
62
The ‘dead time’ of the instrument is :
Answer
B. The time required by an instrument to begin to respond to a change in the measurand
63
Which motor has the highest power to weight ratio ?
Answer
A. Universal motor
64
Resistance : Conductance : :
Answer
D. Reluctance : permeance
65
A lag network for compensation normally consists of : |
Answer
B. Rand C elements
66
Which type of wattmeter cannot be used for d.c ?
|
Answer
C. Induction type
67
Transformer-core laminations are made of :
Answer
A. _ Silicon steel
68
Skewing of rotor slots helps in :
Answer
C. Suppressing undesirable harmonics
69
The colour of sodium lamp is : |
Answer
B. Yellow
70
Electric potential is
Answer
A. Scalar quantity
71
Fleming’s left hand rule is applicable to :
Answer
D. d.c. motor
72
Application of Nortion’s theorem to a circuit yields :
Answer
D. Equivalent current source and impedance in parallel i
73
As the voltage of transmission increases, the volume of conductor :
Answer
C. Decreases
74
A material commonly used for shielding or screening magnetism is :
|
Answer
C. Soft iron
75
Which of the following devices cannot convey from d.c. to a.c. ? |
Answer
Question Cancelled
76
Heat from the filament of a lamp is transmitted to the surrounding mainly through :
Answer
C. Radiation
77
The form factor for half wave rectified sine wave is : :
Answer
D. 1.57 4
78
The frequency of e.m.f generated by a generator depends upon its :
Answer
D. Both
79
Cylindrical winding on transformers is generally used beyond : :
Answer
A. 6KV
80
The superposition theorem is used when the circuit contains:
Answer
B. A no. of voltage sources
81
The time required for 1 KW electric heater to raise the temperature of 10 litres of water
through 10°C is :
Answer
B. 420 sec
82
The most convenient way of achieving large capacitance is by using :
Answer
A. multiplate construction
83
The source of magnetic filed is : ‘
Answer
B. Current loop
84
Which of the following is a dry storage cell? _
Answer
B. Nickel cadmium cell
85
Q factor of a coil is:
Answer
C. XL/R
86
For both series as well as parallel circuits, which statement is true ?
Answer
B. Powers are additive
|
87
Dynamometer type instruments can be used for :
|
Answer
C. ac. and dc.
88
The actuating quantity for the relays can be :
Answer
D. Any of the above
89
The unit of relative permeability is ;
Answer
D. Dimensionless
90
Which of the following is a ferromagnetic material ?
Answer
A. Nickel
91
The back e.m-f of a d.c. motor depends on : |
Answer
A. Field flux
92
EMF of cell depends on :
Answer
C. Electrolyte
93
In two phase system, the phase will differ by an angle of :
Answer
A. 90°
94
Thermocouple work on which of the following effects ?
Answer
B. Seebeck effect
|
95
For parallel operation, the generators normally preferred are :
Answer
B. Shunt generators
96
For wave winding, the average pitch must be :
Answer
C. OddorEven
97
Energy stored in magnetic field is:
Answer
B. E = 1/2 LI²
98
The starting resistor is connected in :
Answer
D. series with the armature
99
The drive motor used in a mixer grinder is
Answer
D. Universal motor
1 |
100
The period of 50 second corresponds to a frequency of :
Answer
C. 50 Hz
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