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மாணவர்களே வினாக்கள் வீடியோ வடிவில் உங்களுக்காக கிளிக் செய்யுங்கள் லிங்கை
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Wireman theory sem 4 jan 2016 questions

Wireman theory sem 4 jan 2016 questions

In a power transformer the current flowing in
the coil connected to the AC source is..........
A  LT winding
B   primary winding
C  HT winding
D  secondary winding

The transformer used to transmit the power
to longer distance is called as..............
A  current transformer
B   step up transformer
C   voltage transformer
D  step down transformer _

The function of this magnetizing current (lm)
is to.......
A   magnetize the core
B  energize the primary winding
C   energize the secondary winding
D   to the compensate the loss

The magnetizing current (im) is very small in
magnitude and lags the applied voltage (Vs)
by.........
A 120°
B 90°
C 60°
D 30°

The transformation ratio (K) is more than 1
then the transformer is a........
A  step up transformer
B  auto transformer
C  step down transformer
D  current transformer

The transformation ratio (K) is more than 1
then the transformer is a........
A  step up transformer
B   auto transformer
C  step down transformer
D  current transformer

tn which condition the maximum efficiency
will occur in transformer?
A  iron loss greater than copper loss
B   iron loss equal to copper loss
C   copper loss greater than iron loss
D  copper loss less than eddy current loss

To ensure that the core insulation between
clamp plates and core bolts is adequate, the
test voltage applied is.........
A   1.0 .KV
B   1.5 KV
C  2.0 KV
D   2.5 KV

As per IE rule, in H - type pole mounted
sub -station, minimum clearance between
live conductor and earth structure is..........
A  305 mm
B  310 mm
C  315 mm
D  320 mm

The incoming and outgoing lines in a sub -
station are connected to...............
A ACB
B OCB
C  bus bar
D gang isolator

Bus bar assembly should be installed at a
height from the ground is........
A 2.75 m
B 2.50 m
C 2.25 m
D 2.15 m

The bus bar sections are available in
standard length of............
A 3.50 m
B 3.55 m
C 3.60 m
D  3.65 m

For bolts and nuts used for connecting
aluminium bus bar shall be........
A  tinned forged brass
B iron
C copper
D steel

Bus bar supports are spaced (maximum)
apart is..........
A 500 mm
B 550 mm
C 600 mm
D   650 mm

The temperature of cooker is controlled
by........
A thermostat switch
B  SPT switch
C  two way switch
D   push button switch

Rod type thermostats are being used in
A  geysers cooking ranges
B  small mixers
C  room heater
D  cooling ovens


The name of mercury switch used in a power
transformer is.........
A current relay
B  bucbholz's relay
C  voltage relay
D  thermal relay

In the distribution substation the step down
voltage 3 phase, 4 wire for supply is........
A 440V
B 415V
C  410 V
D   400 V

The lightning arrestors to protect the
substation from lighting is installed on
A HTside
B  primary side
C   LT side
D   secondary side

The pole mounted sub stations are generally
used for transformer capacity upto.........
A  250 KVA
B   200 KVA
C   150 KVA
D 110KVA

The OCB is installed on the...............
A HTside
B   LT side
C   primary side
D  secondary side

As per IE rules to H - type pole mounted
sub stations, phase to phase clearance
between jumpers is..............
A  0.91 m
B   0.90 m
C   0.81 m
D   0.80 m

Pellet type lead oxide arrestor acts as an
insulator if the temperatures increased
beyond.............
A 130*C
B 140°C
C 145°C
D   150°C

ACB stands for..........
A  Air Circuit Breaker
B  Air Current Breaker
C  Air Case Breaker
D  Air Conductor Breaker

Transformers used to transform high voltage
and high current is...............
A  two coil transformer
B  current transformer
C   potential transformer
D   instrument transformer

Which one is the specification of potential
transformer?
A  Voltage ratio
B Current
C Wattage
D impedance

EHT stands for............
A  Extra High Terminal
B   Extra High Tension
C   Extra High Thermostat
D   Equipment High Tension

Underground LT cables voltage capacity
is...........
A 1.1 KV and below
B 2.2 KV and below
C 3.0 KV and below
D   3.3 KV and below

Full form of Mi cables is..
A  Multi Insulated cables
B  Mineral Insulated cables
C  Multi Insulated conductor
D   Mini Insulated cables

In UG cable joints, the cold pouring
compound consists of a resin base and a
hardener which is...........
A  poly amino
B   poly vinyl
C  poly chloride
D poly methyl

The mixture of the compound used in UG
cable joints is resin and hardener, this is
churned till the compound colour is..........
A blue
B grey
C white
D red

The bituminous compound melting
temperature is.........
A 100eC
B 90°C
C 80°C
D 70°C

The electrolyte used in simple voltaic cell
is...............
A  dilute sulphuric acid
B  ammonium chloride
C   potassium hydroxide
D  zinc oxide

The potential difference in volts is
A emf-laRa
B emf-IR
C emf-P.D
D  PD-emf

High energy density battery used in
spacecraft is..........
A  lead acid battery
B  lithium battery
C  nickel cadmium ceils/battery
D  alkaline manganese cells/battery

The capacity of the cell/battery is expressed
in..........
A Ah
B Wh
C  W sec
D  A sec

A 20 Ah battery can supply 1A cunent
for.........
A  0.02 hr
B  0.2 hr
C  2.0 hr
D  20 hr

The Leclanche cell contains a strong solution
of.................
A ammonium chloride
B potassium hydroxide
C   manganese dioxide
D  sulphuric acid

Local action in a simple voltaic cell, are seen
from the...........
A  positive plate
B  zinc plate
C   carbon plate
D   lead plate

The plante plates in a lead acid battery are
made of...........
A  pure lead
B  lead peroxide
C   lead sulphate
D   nickel hydrate

The specific gravity of an electrolyte is
measured with a.............
A pyrometer
B hydrometer
C thermometer
D galvanometer

Which one of the following will ascertain the
condition of the lead acid battery?
A  specific gravity
B  no of plates
C  area of plates
D   distance between plates

In a fully charged lead acid battery the
specific gravity is.............
A 1.26
B 1.20
C 1.18
D 1.15

A secondary battery should not be
discharged beyond the minimum value of
voltage is...........
A 1.3 V
B 1.5V
C 1.7 V
D   1.8 V


Secondary cell temperature during charge
does not exceed the limit specified............
A 40°C
B  41 °C
C 42°C
D 43°C

In larger transformers a stepped core
arrangement is used to minimize the use of
copper and............
A  iron loss
B  eddy current loss
C  hysteresis loss
D  copper loss

Transformer lamination thickness for 50 HZ
is.............
A 0.25 mm
B 0.24 mm
C 0.23 mm
D  0.22 mm

Primary winding has 450 turns and
secondary winding has 90 turns. What will be
the secondary voltage if primary voltage is
220 volt?
A 45 volt
B 44 volt
C 42 volt
D 40 volt

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