| Post Name | ASSISTANT ENGINEER - ELECTRICAL |
|---|---|
| Department | HARBOUR ENGINEERING |
| Question Paper Code | 030/2016 |
| Date of Test | 17 February 2016 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Three resistances each having a value of a Ohm are connected to form a Y structure. If a
3 phase balanced supply with a line voltage of A volts is applied, then the power drawn per
phase from the supply is:
Answer
A.
2
A230V, 50Hz, 1¢ supply is connected to the series combination of a pure resistance of 500 a
pure variable capacitor of 25u/’ and a pure variable inductor of 1.5mH. By properly
adjusting the component values, it is made that the current through the circuit is maximum.
| What is the power factor of the circuit now?
Answer
D. 2
3
In 3¢ power measurement using 2 Wattmeter method, both the Wattmeters are reading |
positive and equal. This is because : |
Answer
A. The load is purely resistive ~
4
A dc source of EMF E Volts and internal Resistance, R Ohms is connected to a variable load and it is adjusted such that the load abstracts maximum power from the source. The current drawn from the source is:
Answer
D. E/2R
5
The minimum number of NAND gates required to implement a NOR gate 1s :
Answer
D. none of the above
6
IfAand Bare boolean variables, the boolean expression A+ AB is:
Answer
D. A
7
Which one among Aluminum, Constantantan Mercury, Carbon have highest resistivity :
Answer
D. Carbon
8
For a two terminal device, resistance decreases when the temperature increases, the
device is :
Answer
B. asemiconductor
9
Which one among the following has 2 fully stable states?
Answer
C. Flipflop
10
Ina hydro electric generation system, pressure variations due to rapid changes in velocity of
water is mitigated using :
Answer
C. Surge tank —
11
In a complex network containing active voltage sources with zero internal resistances and
linear bilateral elements the open circuit voltage across 2 terminals is 25V and the resistance
of the network viewed from the open circuited terminal is 6.259. Lf an eqivalent circuit
comprising of only a current source and impedance is made, the current source rating Is :
Answer
D. 4A
12
A three phase balanced delta connected load of 5+ j6Ohm in each phase is connected to a
line voltage of 400V is drawing a current from the supply. If another delta connected load of
same nature and magnitude is connected in parallel, the line current drawn from the supply
becomes :
Answer
A. Double
13
In an synchronous generator, selective elimination of odd harmonics can be done by :
~
Answer
C. Short coding of winding
14
The surface integral of the normal component of Electric Field Intensity over a closed surface
is equal to =. times the total charge inside it. This is the statement of :
€, ;
Answer
A. Gauss's Theorem
15
Smooth cylindrical type rotors with less diameter and large axial length are used for
Synchronous generators driven by :
Answer
C. Steam turbines
16
If the number of poles in a syncronous machine is 6, a slot angle of 10° mechanical, when
expressed in electrical degrees is :
Answer
C. 30
17
If the number of turna of an inductive coil is doubled and core length is quadrupled, other
parameters being the same, the inductance of the coil became :
Answer
D. unchanged
18
Which one among the following is TRUE regarding the selection of working flux density in
transformer design?
Answer
D. High flux density in the core results into saving in cost of iron
19
If the ratio of average charge voltage to average discharge voltage in a lead acid cell is 4/3, the ratio of its Watt Hour efficiency to Ampere hour efficiency is:
Answer
A. 0.75
20
A three phase induction motor runs at 2% slip and its rotor frequency is 1Hz. Stator
frequency in Hertz is: |
Answer
B. 50
21
To have a smooth, quite running of an induction motor by reducing humming and to prevent
cogging, the technique used is called :
|
Answer
C. Skewing
22
If the flux per pole of a shunt-wound DC generator is halved and the number of poles is
doubled, the generated e.m.f. at constant speed :
Answer
A. remains the same
23
In de generators, the winding used in a machine delivering low voltage, high current
load is :
Answer
B. lap winding
24
Which among the following can support a synchronous motor in Starting :
Answer
A. Damper winding
25
‘Two reaction theory is used in the analysis of Synchronous machine to take into account the :
Answer
B. Non uniformity of air gap between stator and rotor of a salient pole machine
26
Ina transformer delivering a variable load, Zero voltage regulation can occur at :
Answer
D. 0.7 leading power factor load
27
In an alternating voltage supply of constant voltage feeding a Transformer, the presence of
higher order harmonics can cause significant changes in: . - |
Answer
C. Core losses |
28
The Maximum percentage efficiency of a IKVA transformer with iron losses equal to 125 W
| at upf load is ;
Answer
Question Cancelled
29
Which among the following logic families are fastest in operation?
Answer
A. ECL
30
De Morgan's Law says :
Answer
D. and (B) above (D) None of the above
31
Which of the following is/are the features of an Asynchronous counter?
Answer
Question Cancelled
32
Which one of the following is fully CORRECT regarding 8085 microprocessor?
Answer
D. It has hardware and software interrupts
33
Which among the following is TRUE about an 8086 microprocessor?
Answer
Question Cancelled
34
The excess-3 code correspormding to decimal number 156 1s :
Answer
C. O100710001001
35
, 35, A Mod-31 synchronous Counter ideally has —————— number of flipflops.
Answer
D. 5
36
Which among the following is/are TRUE regarding the OP AMP circuit?
Answer
C. In Differentiator, gain is increased with an increase in frequency
37
When comparing Active and Passive filters, which of the following statements are Wrong?
Answer
D. All the above are correct
38
For unipolar operation. an 8 bit Digital to Analog Converter has a resolution of :
Answer
B. 256
39
Ina circuit containing a transistor, both of its junctions are forward biased. It operates !
in ——————_ region.
Answer
B. Saturation
40
Number of valance electrons in Germanium is :
Answer
D. 4
41
The Switched Mode Power Supplies have higher energy efficiency compared to Linear Power
Supplies because :
Answer
Question Cancelled
42
Gain of an amplifier can be stabilized by :
Answer
B. Employing Negative feedback
43
If only 5 bites are used for addressing the memory of a computer system, the memory
size is:
Answer
C. 32
44
The ripple factor and efficiency of a half wave rectifier are respectively :
Answer
B. 1.21 and 40.6%
45
For a short transmission with series impedance Z, all the capacitances being negligibly small, the ABCD constants of the line are:
Answer
A. A = 1, B = Z, C = 0, D = 1
46
The load flow analysis algorithm having the least rate of convergence is :
Answer
C. Gauss Seidel Method
47
The Opposition to the flow of current in a conductor can increase in ‘alternating circuits
compared to de circuits due to:
Answer
D. (A) and (B) above
48
What is meant by a flat line or Infinite line?
Answer
C. Line terminated with charesteric impedance
49
Which one among the following is a method for equalizing the potential across the various
units of a atring insulator?
Answer
B. Usage of step grading
50
Under ground cables are less preferable in high voltage transmission because of :
!
Answer
B. high charging current:
51
oo.
oG.
a7.
a8.
The metals normally used in a HRC fuse are :
Answer
B. Tin and Silver
52
The transient stability of a power system can be improved by :
Answer
B. Using parallel lines
53
For economic load dispatch :
Answer
C. Incremental fuel cost of each machine should be same
54
In a power system, the cost of generated electrical enegry will be low if:
Answer
B. both load factor and diversity factor are high
55
An over exited synchronous machine has a lagging powerfactor. The machine is :
Answer
B. Generating
56
Which among the following is/are CORRECT about an RC phase shift oscillator?
Answer
D. All the above
57
In class B operation of power amplifiers, the collector current flows for :
Answer
C. Half the cycle
58
For the characteristic equation 2s⁴ + s³ + 3s² + 5s + 10 = 0, the number of roots in the left half s plane is:
Answer
A. 2
59
The unity negative feedback system with GH(s) = (10s + 1)/(s² + 8as + 4k) oscillates at 2 rad/s only when:
Answer
Question Cancelled
60
The ratio of total power in the Amplitude modulated wave to the unmodulated carrier power
when the modulation index is ‘m'
Answer
C. 1440"
61
The voltage across a load element is 404-15 and the current through the element is
2.54 -30. The circuit powerfactor is :
Answer
B. Leading
62
100 numbers of 122 linear bilateral resistances are connected 1n parallel and the combination
is fed by a 10A constant current source. The power delivered by the source is :
|
Answer
A. 10W
63
Referring to a power plant, the term hot reserve refera to:
|
Answer
B. Reserve generating capacity not in service, but available
64
Power supply used for dielectric heating will normally have a frequency in the range :
Answer
A. lto§ kHz
65
As per Kelvin’s Law, the most economical size of conductor 1s that for which :
Answer
C. The variable part of the energy charges is equal to the cost of annual energy losses
66
Output voltage of a simple ideal buck type de-de converter working in continuous current
mode with an input voltage of 12V and turn ON time ims and switching frequency 50Hz is :
Answer
A. 6V
67
A power electronic circuit which can give a 2.5V, 30Hz output wave from a supply of 5V,
60Hz supply is:
Answer
C. Flyback Conveter
68
Ina power electronic circuit, a free wheeling diode is used across a de load to:
Answer
B. B) Prevent revereal of load voltage
69
‘Ten, 15V batteries each having an internal resistance of 3Q are connected in series such that
one is aiding the others. Its Norton’s equivalent circuit has :
Answer
B. Acurrent source of 5A and parallel resistance of 80
70
The value of specific gravity of a lead acid battery under fully carged condition 1s
approximately :
Answer
B. 2
71
Which one of the following is equal to one ampere of current?
Answer
A. Siemens/second
72
An Ammeter is found to have a cramped scale. This is because :
Answer
D. of both
73
An Ammeter is found to have a cramped scale. This is because :
Answer
C. its deflecting torque has a nonlinear variation with respect to current
74
Of the power electronic circuits, circuit employing Power MOSFETs has a higher switching frequency because :
Answer
A. MOSFET is a majority carrier device
75
A measure of repeatability of measurement of a quantity is:
Answer
A. Precision
76
The analogous electrical circuit quantity corresponding to the magnetic circuit quantity, |
| permeability is :
Answer
A. Conductivity
77
“In load flow analysis the role of a slack bus is :
Answer
D. all of the above ot
78
Rotation of a Rotating Induction Type Mechanical Energy Meter under no load condition can
i be reduced by :
Answer
D. Drilling holes in the disc
79
The needle of a MI Ammeter oscillates around a central value. It may be due to poor:
Answer
A. Damping torque
80
The range of an Ammeter is to be extended from 250 mA to 2A. If the 250 mA meter has an i
internal resistance of 10Q, what is the approximate value of the shunt resistance required to
extend the range :
Answer
A. 1.439
81
Time taken by the Constituent Assembly to prepare Constitution is? .
Answer
Question Cancelled
82
In India Fundamental duties are adopted from :
Answer
C. USSR Constitution
83
Whois the author of Ente Gurunathan?
Answer
A. Valithol Narayana Menon
84
The place where Ayyankali started a school for depressed classes?
Answer
D. Vengannoor |
85
Who started the News Paper ‘Mithavadi in 1907?
Answer
A. Moorkoth Kumaran
86
Who wrote ‘Sahithya Vicharam’? |
Answer
D. M.P. Poul
87
How many people signed in ‘Ezhava Memorial’?
Answer
C. 13176
88
‘Jathy Kummy’ which criticized the prevailing caste system was written by :
Answer
B. Pandit Karuppan
89
Who introduced the ‘Subsidiary Alliance System"?
Answer
C. Lord Wellesly
90
The national Anthem of India ‘Jana gana Mana’ was first sung at :
Answer
A. Calcutta 1911
91
Who is known as ‘Kerala Kalidasan’?
Answer
C. Kerala Varma Valiya Koil Thampuran
92
“Oru Theruvinte Kadha’ was written by :
Answer
B. SK Pottakkad
93
Who was the first Indian to be elected to the British parliament?
Answer
D. Dadabhai Naoroji
94
The great Victoria Desert is located in : |
Answer
C. Australia
95
Ajanta Caves are located in the state of :
Answer
C. Maharastra
96
- At which place Gauthama Buddha delivered his first sermon? |
Answer
D. Saranath
97
In which of the following states does 16" National Women Boxing Championship take place?
|
Answer
B. Assam
98
Who has been elected as the first male member of national Commission for women?
Answer
A. Alok Rawat
99
Who has won the Nobel Prize 2015.in Literature?
Answer
C. Svetlana Alexievich
100
World Water Day is celebrated every year on. : |
Answer
C. March 22
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