1.
In submerged arc furnace the power is
controlled by ______?
Either Varying the spacing between the electrodes or Varying the voltage applied to the electrodes.
Either Varying the spacing between the electrodes or Varying the voltage applied to the electrodes.
2.
The minority carrier concentration is
largely a function of
temperature
temperature
3.
The insulating material should have
all of these
all of these
4.
In illumination technology total lumens
emitted by source / total lumens available after waste of light is equal to
_______?
waste light factor.
waste light factor.
5.
A control system in which the control action
is somehow dependent on the output is known as
Closed loop system
Closed loop system
6.
Overload capacity of diesel engines is
usually restricted to
2 percent
2 percent
7.
Constantan contains
copper and nickel
copper and nickel
8.
The current carrying capacity of cables in
D.C. is more than that in A.C. mainly due to
smaller dielectric loss
smaller dielectric loss
9.
According to application, instruments are
classified as
Both switch board and portable
Both switch board and portable
10.
A wound rotor induction motor is preferred,
as compared to squirrel cage induction motor, when major consideration is
high starting torque
high starting torque
11.
Specified quantities of load bus are ______?
P and Q
P and Q
12.
The design of mechanical parts is
particularly important in case of _____ speed machines.
high
high
13.
Automatic signalling is used for which of
the following trains ?
Superfast trains
Superfast trains
14.
Operating torques in analogue instruments
are
deflecting, control and
damping
deflecting, control and
damping
15.
Zero initial condition for a system means
system is at rest and no energy is
stored in any of its components
system is at rest and no energy is
stored in any of its components
16.
both the ground fault and the
short-circuit fault
17.
In a stepper motor the detente torque means
???
minimum of the static torque with
the phase winding unexcited.
minimum of the static torque with
the phase winding unexcited.
18.
The principle on which vector voltmeter is
based is
that it measures the amplitude of a
single at two points and at the same time measures their phase difference
that it measures the amplitude of a
single at two points and at the same time measures their phase difference
19.
To reduce the radio interference which line
is/are transposed?
Both of these
Both of these
20.
In which of the following applications the
load on motor changes in cyclic order ?
All of these
All of these
21.
In transmission lines distribution constants
are ??
resistance, inductance and
capacitance
resistance, inductance and
capacitance
22.
Heat is transferred simultaneously by
condition, convection and radiation
inside boiler furnaces
inside boiler furnaces
23.
Which of the following is/are the methods to
reduce the armature reaction and its effects?
All of these
All of these
24.
The thermal conductivity of hydrogen is
______ times that of air.
7
7
25.
Helical windings are used in
power transformers
power transformers
26.
The function(s) of an heating chamber is/are
to ________
All of these
All of these
27.
Non-linear resistors
produce harmonic distortion
produce harmonic distortion
28.
Capacitor start capacitor run provides
________
high staring torque and high power
factor.
high staring torque and high power
factor.
29.
The braking retardation is usually in the
range
3 to 5 km phps
3 to 5 km phps
30.
Proximity effect depends on _______?
All of these
All of these
31.
The supply frequency usually employed for
high frequency eddy current heating is ________
10 KHz to 400 KHz.
10 KHz to 400 KHz.
32.
The material for armouring on cable is
usually
any of these
any of these
33.
Induction type single phase energy meters
measure electric energy in
kWh
kWh
34.
Demagnetization effects which of the
following?
reduction in main field flux and
reduces the terminal voltage
reduction in main field flux and
reduces the terminal voltage
35.
Which of the following motors is usually
preferred for kiln drives ?
Any one of these
Any one of these
36.
_______ is an instrument which measures the
insulation resistance of an electric circuit relative to earth and one another,
Meggar
Meggar
37.
Overhead telephone wires are made of
steel
steel
38.
Which of the following insulation is used in
cables ?
all of these
all of these
39.
Which of the following methods is used to
control speed of 25 kV, 50 Hz single phase traction ?
Tap changing control of transformer
Tap changing control of transformer
40.
A closed loop system is distinguished from
open loop system by which of the following ?
Feedback
Feedback
41.
The coasting retardation is around
0.16 km phps
0.16 km phps
42.
If a power cable and a communication cable
are to run parallel the minimum distance between the two, to avoid
interference, should be
15 cm
15 cm
43.
Surface resistance of an insulating material
is reduced due to the
both smoky and dirty atmosphere and
humidity in the atmosphere
both smoky and dirty atmosphere and
humidity in the atmosphere
44.
Which of the following is an open loop
control system ?
Field controlled D.C. motor
Field controlled D.C. motor
45.
A control system with excessive noise, is
likely to suffer from
saturation in amplifying stages
saturation in amplifying stages
46.
The conduction of electricity, in
semiconductors, takes place due to movement of
electrons and holes
electrons and holes
47.
Commercial available medium size machines
have a speed range of ______ .
2000 to 2500 r.p.m.
2000 to 2500 r.p.m.
48.
Circuit breakers are essentially
current carrying contacts called
electrodes
current carrying contacts called
electrodes
49.
The process of heat transfer during the
reentry of satellites and missiles, at very high speeds, into earth's
atmosphere is known as
ablation
ablation
50.
Energy consumption in propelling the train
is required for which of the following?
All of these
All of these
51.
Maximum power developed is depends on
______?
Both of these
Both of these
52.
The overall efficiency of steam locomo¬tive
is around
5 to 10 percent
5 to 10 percent
53.
factories for material
transportation
54.
In an energymeter braking torque is produced
to
maintain steady speed and equal to
driving torque
maintain steady speed and equal to
driving torque
55.
The stator of phase shifting transformer for
use in conjunction with an A.C. potentiometer usually has a
two-phase winding
two-phase winding
56.
In a system zero initial condition means
that
The system is at rest and no energy
is stored in any of its components
The system is at rest and no energy
is stored in any of its components
57.
If sparsity of a 5 bus transmission line is
0.4. Find the number of transmission lines?
5
5
58.
_____ is the main constituent of glass
Si02
Si02
59.
Advantages of shunt compensation is/are
_______
It requires less maintanance
It requires less maintanance
60.
Range of accelerating factor is
1.6 to 1.8
1.6 to 1.8
61.
The horsepower of steam locomotives is
upto 1500
upto 1500
62.
In most condition which frame of motor will
be preferred?
Totally enclosed fan coiled.
Totally enclosed fan coiled.
63.
The ratio of maximum displacement deviation
to full scale deviation of the instrument is called
linearity
linearity
64.
Insulating materials have the function of
preventing a short circuit between
conducting wires
preventing a short circuit between
conducting wires
65.
High tension cables are generally used upto
11kV
11kV
66.
Low resistivity materials are used in
all of these
all of these
67.
To avoid the effect of stray magnetic field
in A.C. bridges we can use
magnetic screening
magnetic screening
68.
Aluminium is now most commonly employed
conductor material in transmission lines than copper because _____
it is cheaper and lighter
it is cheaper and lighter
69.
Wagner earthing device is used to eliminate
errors due to
electrostatic coupling
electrostatic coupling
70.
In synchronous motor, the damper winding is
generally used to ____?
prevent hunting and provide the
starting torque.
prevent hunting and provide the
starting torque.
71.
The number of atoms per unit cell in B.C.C.
structure is
2
2
72.
Mercury as an electric contact material is
a metal liquid
a metal liquid
73.
The adjustment of position of shading bands,
in an energy meter is done to provide
friction compensation
friction compensation
74.
Transmission lines are transposed to reduce
__________?
interference with neighbouring
communication lines
interference with neighbouring
communication lines
75.
The density of hydrogen is _____ times the
density of air.
0.07
0.07
76.
The rate of acceleration on suburban or
urban services is restricted by the consideration of
Passenger Discomfort
Passenger Discomfort
77.
Which of the following are non-conductors of
electricity?
all of these
all of these
78.
Number of slip rings in 3-phase synchronous
motor will be _______?
2 or 3
2 or 3
79.
In salient pole synchronous machine, maximum
power occurs at a load angle of ??
less than 90°
less than 90°
80.
Maximum power transfer in a transmission
line can be obtained by _____?
Both of these
Both of these
81.
In case of a steam engine an average coal
consumption per km is nearly
28 to 30 kg
28 to 30 kg
82.
Which of the following motors are suitable
for computer printer drive ?
Stepper motor.
Stepper motor.
83.
For dielectric heating the range of
frequency normally employed is ________.
10 MHz to 40 MHz.
10 MHz to 40 MHz.
84.
With conventional hydrogen cooling it is
possible to increase the rating of a single unit to
200 MW
200 MW
85.
When a bogie negotiates a curve, reduction
in adhesion occurs resulting in sliding. Thus sliding is acute when
Both wheel base of axles is more and
degree of curvature is more
Both wheel base of axles is more and
degree of curvature is more
86.
For a hole which of the following statements
is incorrect ?
Holes can exist in any material
including conductors
Holes can exist in any material
including conductors
87.
The slot leakage can be calculated by making
which of the following assumptions ?
All of these
All of these
88.
The efficiency of diesel locomotives is
nearly
20 to 25 percent
20 to 25 percent
89.
The statement which is not correct from the
following:
For a uniform long charged line with
l1 c/m the electric field intensity E is given as E = ?L/(p e0.r).
For a uniform long charged line with
l1 c/m the electric field intensity E is given as E = ?L/(p e0.r).
90.
The frequency and time domain are related
through which of the following?
Laplace
Transform and Fourier Integral
91.
The voltage control in electric supply
networks in required on account of which of the following reasons ?
All of these
All of these
92.
In a meggar controlling torque is provided
by
coil
coil
93.
In a cable the voltage stress is maximum at
core of the conductor
core of the conductor
94.
Advantages of gauss siedel method is/are
_______?
calculation time for each iteration
is less
calculation time for each iteration
is less
95.
A phase shifting transformer is used in
conjunction with
Drysdale potentiometer
Drysdale potentiometer
96.
For germanium the forbidden energy gap is
0.7eV
0.7eV
97.
Which of the following methods is most
accurate ?
Equivalent current method
Equivalent current method
98.
Which of the following statements is correct
for a system with gain margin close to unity or a phase margin close to zero ? The system is highly
oscillatory
99.
Which part of a motor needs maximum
attention for maintenance ?
Rearing
Rearing 
