| Post Name | Assistant Engineer - ELECTRICAL |
|---|---|
| Department | PWD / IRRIGATION / TRAVANCORE TITANIUM PRODUCTS Limited |
| Question Paper Code | 213/2014 |
| Date of Test | 18 December 2014 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The average power delivered to an impedance (4—j3)Q by a current 5cos (1007t+100)A
is:
Answer
A. 50W
2
The power in a series RLC circuit will be half of that at resonance when magnitude of current is equal to :
Answer
Question Cancelled
3
The Thevenin’s equivalent of a circuit operation at ω = 5 rads/s, has V_oc = 3.71 ∠ 15.9° V and Z_0 = 2.38 - j0.667 Ω. At this frequency, the minimal realization of the Thevenin’s impedance will have a :
Answer
A. resistor and capacitor
4
If E⃗ is the electric intensity, ∇(∇ * E⃗) is equal to (a)(b):
Answer
C. Zero
5
If E is the electric intensity, V(¥ * E) is equal to
Answer
A. E
6
Consider a long, two-wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and the distance between their centres is 1 m. If this distance is doubled, then the inductance per unit length :
Answer
A. increases but does not double
7
Consider a long, two-wire line composed of solid round conductors. The radius of both
conductors is 0.25 em and the distance between their centres is 1 m. If this distance is doubled,
then the inductance per unit length :
Answer
D. decreases but does not halve
8
A passive 2-port network is in a steady state. Compared to its input, the steady-state output can never offer:
Answer
D. greater power
9
_ A passive 2-port network is in a steady-state, Compared to its input, the steady state output
can never offer :
Answer
D. greater power
A 3
(P.T.O.}
10
“The total electric flux through any closed surface surrounding charges is equal to the amount
of charge enclosed”. The above statement is associated with :
Answer
D. Gauss’s law
11
The voltage induced in a transformer per turn is :
Answer
C. same whether it is primary or secondary
12
A 3-phase, 3-wire, 100 V system supplies a balanced delta-connected load of z = 2 + j7 Ω. The line currents when one of the lines is opened are:
Answer
A. 20.6∠−74.05°, 20.6∠−74.05°, 0
13
Which of the following relay is used on transformers ?
Answer
A. Buchholz relay
14
Steady magnetic fields are governed by law.
Answer
C. Both
15
The following is true :
Answer
C. A bounded signal always possesses finite energy
16
The system characterized by the equation y(t) = ax(t) + b is:
Answer
B. non-linear
17
The impulse response of a system is h(n) = aⁿu(n). The condition for the system to be BIBO stable is:
Answer
B. |a| < 1
18
The continuous-time system described by y(t) = x(t²) is:
Answer
B. non causal, linear
19
The region of convergence of the z-transform of the signal 2° u(n) — 3°u(—n-1):
Answer
B. is2<]z}<3
20
The Fourier Transform of a rectangular pulse is :
Answer
C. Sine function
21
The open circuit test of a transformer gives information about :
Answer
A. Core losses of the transformer —
22
For a transformer which of the following, connection is best suited for 3 phase, 4 wire
service ?
Answer
C. Delta - star
23
The typical value of turns ratio of a transformer used only for electrical isolation between
two circuits can be :
Answer
D. Equal to unity
24
A transformer 4,000 kVA, 250 Hz is operated at 50 Hz. Its kVA rating should be revised to :
Answer
A. 800 kVA
25
Among the following the transformer having largest size is :
Answer
A. 250 kVA, 25 Hz
26
Incorrect polarity of transformers during parallel operation of transformers will result in :
Answer
B. Dead short circuit
27
For a transformer the all day efficiency primarily depends on :
Answer
D. both
28
Ifa D.C. motor is connected across the A.C, supply it will :
Answer
C. run at lower speed
29
D.C. motor would be preferred for conveyors :
Answer
Question Cancelled
30
What will happen if the back e.m.f, of a D.C. motor vanishes suddenly ?
Answer
C. The armature may burn
31
Ward - Leonard system of de motor speed control is not recommended for :
Answer
C. Constant speed operation
32
Among the following generators which one has poorest regulation ?
Answer
A. | series
33
For stable parallel operation shunt generators are most suitable because their voltage
characteristics is :
Answer
A. drooping
34
Which winding will provide the higher e.m-f. for a D.C. generator when the number of poles
and the number of armature conductors is fixed ?
Answer
A. Wave winding
35
A single phase motor : i i
Answer
C. Is not self starting
36
The current carried by the damper winding under normal running condition is :
Answer
A. Zero
37
For an alternator the power factor is determined by its :
Answer
D. Load
38
Ina synchronous motor the maximum value of torque angle is :
Answer
D. 90° electrical
39
The detent torque in a stepper motor is the :
Answer
D. maximum of the static torque with the phase winding unexcited
40
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The
armature reaction is :
Answer
B. demagnetizing
41
Negative sequence relay is commonly used to protect : |
Answer
D. an alternator
42
Ina transmission line having a sending end voltage V, for a fixed value of complex power
flow the real loss will be proportional to :
I |
2 a ier sage
Answer
D. \2
43
The short, medium and long transmission lines is primarily based on the concept of :
Answer
A. physical length of the line
44
In load flow analysis, the load connected at a bus is represented as :
Answer
B. Constant real and reactive power drawn from the bus
45
In the thermal power plants, the pressure in the working fluid cycle is developed by :
Answer
C. feed water pump
46
Advantage of using bundled conductors in transmission lines is to :
Answer
C. reduce corona
47
The major factor in the insulation strength of an EHV transmission line is ;
Answer
B. switching over - voltages
48
An open-loop system represented by the transfer function G(s) = (s − 1)/((s + 2)(s + 3)) is:
Answer
A. Stable and of the non - minimum phase type
49
The number of roots in the left half of the s-plane for the equation s³ − 4s² + s + 6 = 0 will be:
Answer
B. One
50
Transfer function of a lead compensator used for a closed loop controller is 42. For
s
1+=
(+5)
such a lead compensator :
Answer
C. a
51
As compared to a closed loop system an open loop system is :
Answer
D. more stable but less accurate
52
In the G(s)H{s) plane the Nyquist plot of loop transfer function G(s)H(s) of a closed loop
control system passes through the point (—1, j 0). The phase margin of the system is :
|
Answer
B. 0°
53
The state variable description of a linear autonomous system is Ẋ = AX, where X is the two-dimensional state vector and A = [[0, 2], [2, 0]]. The roots of the characteristic equation are:
Answer
B. −2 and +2
54
Signal flow graph is used to obtain :
Answer
C. Transfer function of the system
55
The damping ratio of a system having the characteristic equation s² + 2s + 8 = 0 is:
Answer
C. 0.353
56
An ammeter having internal resistance of 0.20, has a current range of 0-5 A. In order to
change the range to 0-25 A, we need to add a resistance of :
Answer
A. 0.05 2 in parallel with the meter
57
Ina dynamometer type wattmeter the pressure coil is :
Answer
A. Highly resistive
58
The Q-meter works on the principle of :
Answer
A. series resonance
59
When a load of 450 W is connected, if an energy meter disc makes 10 revolutions in
100 seconds the meter constant (in rev/ kWh) is :
Answer
B. 800
60
Indc potentiometer measurements, a second reading is often taken after reversing the polarities
of de supply. This is to eliminate the effects of :
Answer
C. Stray thermal emf's
61
A low-pass filter with a cut-off frequency of 60 Hz is cascaded with a high pass filter with a
cut-off frequency of 40 Hz. The resultant system of filters will function as :
Answer
D. a band - pass filter
A 9 213/2014
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62
Circuit turn - off time of an SCR is defined as the time : |
Answer
Question Cancelled
63
When is a voltage source inverter normally used ?
Answer
D. Source inductance is small and load inductance is large
64
A single - phase fully controlled thyristor bridge ac - de converter is operating at a firing
angle of 25° and an overlap angle of 10° with constant de output current of 20 A. The
fundamental power factor
Answer
Question Cancelled
65
HVDC transmission systems generally employ :
Answer
C. 12 pulse converters
66
Which of these commutation methods is used in AC-DC converters ?
Answer
A. Class F
67
A single phase half wave rectifier circuit has a freewheeling diode which will conduct only
Tt
Answer
B. load is purely inductive or combination of R and L
68
As compared to BJT, MOSFET has : |
Answer
B. lower switching losses and higher conduction losses
69
Which chopper circuit uses saturable reactor ? Rg
Answer
A. Morgan chopper
70
The contents of the Accumulator, in an 8085 microprocessor, after the following instructions
are executed will become :
XRA A
MVI1B, FO),
SUB B
Answer
A. 10,;
71
Inan 8085 A microprocessor based system, it is desired to increment the contents of memory
location whose address is available in
Answer
A. XCHG
INR M
72
A memory system has a total of 8 memory chips each with 12 address lines and 4 data lines.
The total size of the memory system is :
Answer
D. 16k bytes
73
PSW in 8085 contains :
Answer
D. both
74
Schmitt trigger is a comparator circuit with hysteresis, implemented by applying
to the non inverting input of a comparator or differential amplifier.
Answer
C. positive feedback
75
An IGBT is a combination of : .
Answer
C. MOSFET and BJT
76
Sample-and-hold circuits in analog-to-digital converters (ADCs) are designed to:
Answer
B. stabilize the input analog signal during the conversion process
77
ACSR
Answer
B. over head transmission lines
|
78
If 8 is the loss angle of a cable, its power factor is :
|
Answer
B. sind
|
79
For an EHV equipment for maintenance first it should be isolated and connected to ground
! because :
|
Answer
D. both
80
For protecting from lightning surges which of the following devices can be used ?
|
Answer
D. Any of the above
81
First widow remarriage was conducted by :
Answer
C. V.T. Bhattatirippadu
82
The first President who ordered that instead of “His Excellency” only “Sri” he prefixed to his
name :
|
Answer
D. Pranab Kumar Mukherjee
83
Sabarigiri Project is located in : ;
Answer
B. Pampa
84
Which was known as the first experiment of Gandhi in India ?
|
Answer
A. Champaran Satyagraha
85
Who was known as “Kerala Scott” ? ; Anti)
Answer
D. C.V, Raman Pillai
| 213/2014 12 A
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86
The famous Malayali Memorial was submitted on ;
Answer
A. 189i
87
Founder of sarvodaya samajam :
Answer
C. Vinoba Bhave
88
The leader of revolt of 1857 in Kanpur :
Answer
B. Nana Saheb
89
During Sangam age inhabitants of Mullai is known as :
Answer
A. Idayar
90
The famous work “One hundred years of solitude” was written by :
Answer
C. Gabriyel Garsia Markes
91
The state in which “Vrindavan Chandrodaya Mandir” is proposed to be built is :
Answer
B. Uttar Pradesh
92
Who among the following has become the first Indian Piston shooter to be rank no. 1 in the
world ranking, recently :
Answer
D. Heena Sidhu
93
“Earth Hour” is a movement uniting people to protect the planet, organised by ;
Answer
B. World Wide Fund for Nature
94
The revised Direct Tax code proposes to introduce tax slab for individuals earning more than
= 10 crore a year by taxing them at :
Answer
D. 35%
95
“Panama Disease” or “Fusarium Wilt” is a most deadly disease related to which crop ?
Answer
A. Banana
96
Study of Rocks is known as :
Answer
C. Lithology
97
Who elected with maximum majority in 2014 Loksabha Election from Kerala ?
Answer
B. E. Ahamed
98
Which among the following countries is the largest supplier of arms to India in 2009 - 2013 ?
Answer
D. Russia
99
Minister for Foreign affairs is :
i
Answer
A. Sushma Swaraj
100
Which year is considered as International year of Family Farming ?
Answer
C. 2014
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