Written Test of Electrical Sub
Inspector
Date - 25/03/2012
Duration - 90 minutes
1.
Three capacitors of values 3uf,6uf,12uf are connected in parallel across an A.C
Source. The maximum current passes through
(A)
3uf
(B)
6uf
(C) 12uf
(D)
all the capacitors
2. The power factor at resonance in R-L-C parallel circuit is
(A) 0.5
lagging
(B) 0.5
leading
(C) unity
(D) zero
3. The superposition theorem is applicable to
(A) linear, non linear and time variant circuit
(B) linear and nonlinear circuits only
(C) linear circuits only
(D) none of the above
4. Two incandescent
light bulbs of 40W and 60W rating are connected in series across the mains . Then
(A) the bulb of
60W glows brighter
(B) the 40W
bulb glows brighter
(C) both the
bulbs equally brighter
(D) none of
these
5.the value of
dielectric constant for vacuum is taken as
(A) zero
(B) 1
(C) 4
(D) 10
6. An ideal
voltage source has zero
(A) internal
resistance
(B) internal
conductance
(C) voltage
(D) ripple
7. The capacity
of a cell is measured in
(A) watt hours
(B) watts
(C) voltage
(D)
ampere-hours
8. Metallic sheath
is used in cables
(A) to have
good mechanical strength
(B) to have low
resistance for flow of current
(C) to protect
the cable against moisture and gases present in the soil
(D) none of
above
9. The phase
sequence RYB denotes that emf of
(A) phase Y
lags behind that of R by 120 degree
(B) phase
Y lead behind that of R by 120 degree
(C) all above
(D) non of the
above
10. The choke
in tube light wiring provides
(A) high
impulse voltage
(B) high
current
(C) high
resistance
(D) low
resistance
11. The power
factor of an alternator depends on
(A) load
(B) speed of
the rotor
(C) core losses
(D) armature
losses
12. In double
cage induction motor the inner cage has
(A) low R and
low X
(B) low R and
high X
(C) high R and
high X
(D) high R and
low X
13. The inter
pole winding in DC machine is
(A) shunt
connected
(B) series
connected
(C) separately
excited
(D) short
circuited in operation
14. The function
of commentator in DC machine is
(A) to improve
commutation
(B) to change
AC voltage to DC voltage
(C) to change
DC voltage to AC voltage
(D) to provide
easy speed control
15. The maximum
efficiency of a distribution transformer is
(A) at no load
(B) at 50 %
full load
(C) at 80% full
load
(D) at full
load
16. The maximum
speed variation in 3 phase synchronous motor is
(A) 10%
(B) 6%
(C) 2%
(D) 0%
17. Transformer
core is laminated to
(A) reduce
hysteresis losses
(B) eddy
current losses
(C) copper
losses
(D) all of the
above losses
18. Burden of
current transformer is expressed in
(A) A
(B) V
(C) VA
(D) KW
19. Slip of the
induction motor at starting
(A) zero
(B) one
(C) 0.04
(D) 0.08
20. If the
speed of the DC shunt motor is increased, the back EMF of the motor will
(A) decrease
(B) increase
(C) remain same
(D) none of
these
21. The severity
of electrical shock depends on
(A) current
through the body
(B) line
current in the system
(C) line
voltage
(D) all of
above
22. Bundling of
conductor is done to
(A) reduce
reactance
(B) increase
reactance
(C) reduce
radio interference
(D) both (A)
and (B)
23. Advantage of
neutral earthling is
(A) safety of
potential
(B) reduction
of earth fault current
(C) elimination
of arcing ground
(D) none of
above
24. Graphite is
used in nuclear power station as
(A) fuel
(B) coolant
(C)
moderator
(D) electrode
25. Which of
the following has maximum capital cost
(A) thermal
power plant
(B) hydro power
plant
(C) diesel
power plant
(D) nuclear
power plant
26. As load
factor of plant increases cost of energy generation
(A) increases
(B) decrease
(C) may
increase or decrease
(D) remains
same
27. A large
diversity factor of the load in a power system
(A) reduces the
installation cost
(B) increases
the installation cost
(C) does not
affect the installation cost
(D) none of the
above
28. Induction motor
has relatively high power factor at
(A) high speed
(B) no load
(C) 50% load
(D) near full
load
29. Major share
of power produced in India is through
(A) thermal
power station
(B) hydro power
station
(C) nuclear
power station
(D) diesel
power plant
30. Over excited
synchronous motor on no load is
(A) synchronous
condenser
(B) DC
generator
(C) induction
generator
(D) alternator
31. HRC fuses
provides best protection against
(A) overload
(B) reverse
current
(C) open
circuit
(D) short
circuit
32. In railway
application which circuit breaker is normally used
(A) SF6
(B) bulk oil
(C) minimum oil
(D) air break
33. Wave trap
is used to trap the waves of
(A) power
frequencies
(B) higher
frequencies entering generator or transformer units
(C) either of
above
(D) none of
above
34. Induction
cup relay is operated due to changes in
(A) current
(B) voltage
(C) impedance
(D) all of
above
35. Over voltage
protection is recommended for
(A) hydro
turbine generator
(B) steam
turbine generator
(C) gas turbine
generator
(D) all of
above
36. Over fluxing
protection is recommended for
(A)
distribution transformer
(B) generator
transformer of the power plant
(C) auto
transformer of the power plant
(D) station
transformer of the power plant
37. Outdoor switchgear
is generally used for voltage beyond
(A) 11KV
(B) 33KV
(C) 66KV
(D) 132KV
38. Isolator should
be operated under following condition
(A) there is no
current in the line
(B) line is on
full load
(C) line is
energized
(D) circuit
breaker is not open
39. Which
of the following distribution system is more reliable
(A) radial
(B) tree system
(C) ring main
system
(D) all above
40. Insulation resistance
of high voltage circuit breaker is more than
(A) 1 mega ohm
(B) 10 mega ohm
(C) 100
mega ohm
(D) 500
mega ohm
41. A load
curve indicates
(A) average
power used during the period
(B) average KWH
energy consumption during the period
(C) either of
the above
(D) none of
above
42. Dielectric strength
is normally expressed in
(A) KV
(B) KV/MM
(C) KV/MM
square
(D) KV/KM
43. Luminous efficiency
of a fluoresoent tube is
(A) 10
lumens/watt
(B) 20
lumens/watt
(C) 40
lumens/watt
(D) 60
lumens/watt
44. In house,
the illumination is in the range of
(A) 2-5
lumens/watt
(B)10-20
lumens/watt
(C) 35-45
lumens/watt
(D) 60-65
lumens/watt
45. A single
rotation of a two pole alternator, intended to provide a 50Hz supply frequency,
will take
(A) 2 ms
(B) 20 ms
(C) 50 ms
(D) 500 ms
46. Balancing load
over three phases will reduce
(A) phase
current
(B) neutral
currents
(C) earth faults
(D) over loads
47. Instruments
should be regularly calibrated to
(A) support
local industry
(B) ensure
operative is up to date
(C) ensure
accuracy when testing
(D) provide
a training exercise for operative
48. Straight line
method is useful for find out
(A) annual
depreciation
(B) annual
interest
(C) payback
period
(D) ROI (
return of investment )
49. Electronics
ballast having operating frequency of
(A) 2 khz to 50
khz
(B) 10 khz to 30khz
(C) 10khz to 40khz
(D) 20khz to 60khz
50. For improving
power factor, capacitors are located at
(A) near
load
(B) near source
(C) midway in
line
(D) none of
above
51. Zener diodes
are generally used as
(A) rectifiers
(B) voltage
regulators
(C) oscillators
(D) amplifiers
52. Which of
the following logic family is fastest of all
(A) TTL
(B) RTL
(C) DCTL
(D) ECL
53. MOSFET are
suitably used were
(A) latching
characteristics required
(B) frequency
is comparatively high
(C) both A and
B
(D) none of the
above
54. The reverse
biased in semi conducting devices will
(A) increase
the potential barrier
(B) decrease
the potential barrier
(C) not affect
the potential barrier
(D) make the
potential barrier zero
55. Address bus
of intel 8085 is
(A) 2
(B) 4
(C) 8
(D) 16
56. In a
microprocessor, the register which holds the address of the next instruction to
be fetched is
(A) accumulator
(B) program
counter
(C) stack
pointer
(D) instruction
registers
57. The faster
type of ADC is
(A) closed loop
(B) parallel
(C) time interval
(D)
successive
58. NAND gate
is called universal gate because
(A) it is most
commonly used
(B) it can
realize AND,NOT function
(C) all
minimization techniques can be applied to ti
(D) all logical
functions can be realized by use of NAND gate alone
59. A flip flop
is
(A) a
monostable multivibrator
(B) bistable
multivibrator
(C) an astable
multivibrator
(D) none of the
above
60. Which of
the following converters has binary input
(A) D/A
(B) A/D
(C) any of the
above
(D) none of the
above
61. A moving
iron instrument can be used for
(A) D.C only
(B) A.C only
(C) both D.C
and A.C
(D) harmonics
62. The electrical
power to the meggar is provided by
(A) battery
(B) permanent
magnet DC generator
(C) A.C
generator
(D) any of the
above
63. Murray loop
test can be used for location of
(A) ground
fault on a cable
(B) short
circuit fault on a cable
(C) both the
ground fault and the short circuit fault
(D) none of the
above
64. Ferranti effect
in the transmission line will
(A) increase
sending end voltage at no load
(B) decrease
receiving end voltage at no load
(C) decrease
receiving end voltage at full load
(D) increase
receiving end voltage at no load
65. For measurement
of inductance having high value, we should use
(A) maxwell's
bridge
(B) wein's
bridge
(C) hay's
bridge
(D) wheatstone
bridge
66. To avoid
the effect of stray magnetic field in AC bridge we can use
(A) magnetic
screening
(B) wagner
earthling device
(C) wave
filters
(D) any of the
above
67. In an
energy meter braking torqe is produced to
(A) safe guard
it against creep
(B) break the
instrument
(C) bring the
energy meter to stand still
(D) maintain
steady speed and equal driving torque
68. Which of
the following instrument work on the principle of magnetic effect
(A) watt meters
(B) energy
meters
(C) volt meters
(D) all of the
above
69. The phenomenon
creeping occurs in
(A) ammeter
(B) voltmeters
(C) watt meters
(D) watt hour
meter
70. Thermistors
have________ temperature coefficient
(A) low and
positive
(B) high and
positive
(C) high and
negative
(D) low and
negative
71. Relative permittivity
can be measured by _____ bridge.
(A) whetstone
(B) hay's
bridge
(C)
schering
(D) de sauty
72. Chopper can
be used in future electronic automobiles for
(A) speed
control
(B) braking
(C) speed
control and braking
(D) none of
tgese
73. The fundamental
ripple frequency of a 6 pulse circuit with supply frequency 50Hz is
(A) 100Hz
(B) 200Hz
(C) 300Hz
(D) 600Hz
74. A thyristor
can be termed as
(A) DC
switch
(B) AC switch
(C) either A
and B
(D) square wave
switch
75. The function
of snubber circuit connected across the SCR is to
(A) suppress
dv/dt
(B) increase
dv/dt
(C) decrease
di/dt
(D) increase
di/dt
76. In thyristor
holding current is
(A) >IL
(B) <IL
(C) =IL
(D) none of the
above
77. PIV of the
SCR specifies the maximum value of
(A) forward
blocking voltage
(B) forward
blocking current
(C)
reverse blocking voltage
(D) reverse
blocking current
78. The di/dt
rating of an SCR is specified for its
(A) decaying
anode current
(B) decaying
gate current
(C) raising
gate current
(D) rising
anode current
79. Number of
P-N junction in SCR is
(A) 1
(B) 2
(C) 3
(D) 4
80. Turn on
time of an SCR is normally of the order of
(A) mili
seconds
(B)
seconds
(C) micro
seconds
(D) none of the
above
81. Which method
is used for heating non conducting materials
(A) eddy
current heating
(B) arc
heating
(C) induction
heating
(D) dielectric
heating
82. Motor generator
set for DC welding has generator of
(A) series
type
(B) shunt
type
(C)
differential compound type
(D) shunt
type
83. Long distance
railways use which of the following
(A) 200V DC
(B) 25KV single
phase AC
(C) 25KV two
phase AC
(D) 25KV three
phase AC
84. Quadrilateral
speed time curve pertains to which of the following services
(A) main line
service
(B) urban
service
(C) sub urban
service
(D) urban and
sub urban service
85. For blowers,
which of the motor is preferred
(A) D.C series
motor
(B) synchronous
motor
(C) squirrel
cage induction motor
(D) wound rotor
induction motor
86. While selecting
a motor for air conditioner which of the following characteristics of great
importance
(A) type of
bearing
(B) type of
enclosures
(C) noise
(D) arrangement
for power transmission
87. The electric
braking system commonly employed in rolling mills, elevators and printing
presses is
(A)
plugging
(B) rheostat
(C)
dynamic
(D)
regenerative
88. In brushless
excitation system, on rotor which of the following is
(A)
amplifier
(B)
rectifier
(C)
capacitance
(D)
resistance
89. Zero sequence
ct's are used for
(A) earth fault
protection of cables
(B) protection
of cables from mechanical injury
(C) phase fault
protection of cables
(D) protection
of cables from moisture dust
90. Which of
the following are appropriate tests for a completed panel
(A) flash
testing of components
(B) insulation
resistance and polarity
(C) inspection
of conductor for current carrying
(D)
identification of conductors
91. Assembly language
programming is used for
(A) computers
(B)
modems
(C)
microprocessors
(D) all the
above
92. 80 column
printer means it prints
(A) 80 lines on
the paper
(B) 80
characters per line on the paper
(C) 80 rows per
page
(D) 80 pages it
prints
93. When erase
command is used
(A) the file
content is erased
(B) the file
name is deleted from the directories on the disk
(C) both A and
B
(D) none of the
above
94. The transfer
of data from CPU to peripheral devices of a computer is achieved through
(A)
modems
(B) computer
ports
(C)
interfaces
(D) all of the
above
95. CPU
consists of which of the following
(A)
memory
(B) control
unit
(C) ALU
(D) all of the
above
96. Which command
is used for copying the formatting from one place and applying it to another
place
(A) ctrl+shift+C
(formatting copying)
(B) ctrl V
(C) ctrl
C
(D) ctrl+shift+
V (formatting applying)
97. Which is
the command used for selection of all content in MS word document
(A) ctrl C
(B) ctrl A
(C) ctrl V
(D) ctrl D
98. What is the
full form of internet
(A)
international network
(B) internet
network
(C) internal
network
(D) none of the
above
*
interconnected network
99. Which
mistake is indicated by red line in MS word document
(A)
grammar
(B) spelling
(C) numerical
(D) none of the
above
100. How many
types of page orientation available in MS word
(A) 2
(B) 3
(C) 4
(D) 5
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