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
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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