Thursday, May 23, 2019

2016 FEBRUARY WIREMAN THEORY SEMESTER-IV

2016 FEBRUARY   WIREMAN  THEORY SEMESTER-IV

1. 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 _
Answer:- B   primary winding


2. 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
Answer:- B  step up transformer


3. The function of this magnetizing current (1m)
is to.......
A  magnetize the core
B  energize the primary winding
C   energize the secondary winding
D  to the compensate the loss
Answer:- A  magnetize the core

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


5. The RMS value of emf induced in the
primary winding (Ep) of a transformer is
A   4.40 𝛟MN volt
B 4.44<|>𝛟JNvolt
C   4.44
𝛟fN volts
D 4.44
𝛟𝑚𝒎<j»mfvolt
Answer:- B 4.44<|>𝛟JNvolt

6. 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
Answer:- A  step up transformer

7. In 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
Answer:- B   iron loss equal to copper loss

8. 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
Answer:- C  2.0 KV


9. 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
Answer:- A  305 mm


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


11. 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
Answer:- A 2.75 m

12. 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
Answer:- D  3.65 m


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


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

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


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

17. The name of mercury switch used in a power
transformer is.........
A  current relay
B  buchholz's relay
C  voltage relay
D  thermal relay
Answer:- B  buchholz's relay

18. 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
Answer:- D   400 V


19. The lightning arresters to protect the
substation from lighting is installed on
A   HT side
B  primary side
C  LT side
D   secondary side
Answer:- A   HT side


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


21. The OCB is installed on the
A  HT side
B  LT side
C  primary side
D   secondary side
Answer:- B  LT side

22. 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
Answer:- A  0.91 m


23. 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
Answer:- D 150°C


24. ACB stands for..........
A  Air Circuit Breaker
B   Air Current Breaker
C   Air Case Breaker
D   Air Conductor Breaker
Answer:- A  Air Circuit Breaker

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

26. Which one is the specification of potential
transformer?
A  Voltage ratio
B Current
C Wattage
D Impedance
Answer:- A  Voltage ratio

27. EHT stands for............
A  Extra High Terminal
B   Extra High Tension
C   Extra High Thermostat
D  Equipment High Tension
Answer:- B   Extra High Tension
28. Underground L.T 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
Answer:- A 1.1 KV and below
29. Full form of Mi cables is ……
A  Multi Insulated cables
B  Mineral Insulated cables
C  Multi Insulated conductor
D  Mini Insulated cables
Answer:- B  Mineral Insulated cables
30. 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  poiy methyl
Answer:- A  poly amino
31. 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
Answer:- B grey

32. The bituminous compound melting
temperature is.........
A 100°C
B 90°C
C 80°C
D 70°C
Answer:- B 90°C
33. The electrolyte used in simple voltaic cell
is...............
A   dilute sulphuric acid
B  ammonium chloride
C  potassium hydroxide
D  zinc oxide
Answer:- A   dilute sulphuric acid
34. The potential difference in volts is
A   emf-IaRa
B   emf-IR
C   emf-P.D
D   PD - emf
Answer:- A   emf-IaRa

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

36. The capacity of the cell/battery is expressed
in..........
A  Ah
B  Wh
C  Wsec
D  A sec
Answer:- A  Ah
37. A 20 Ah battery can supply 1A current
for.........
A  0.02 hr
B  0.2 hr
C  2.0 hr
D  20 hr
Answer:- D  20 hr
38. The Leclanche cell contains a strong solution
of.................
A  ammonium chloride
B  potassium hydroxide
C  manganese dioxide
D  sulphuric acid
Answer:- A  ammonium chloride
39. Local action in a simple voltaic cell, are seen
from the...........
A  positive plate
B zinc plate
C  carbon plate
D  lead plate
Answer:- B zinc plate
40. The plante plates in a lead acid battery are
made of...........
A  pure lead
B  lead peroxide
C  lead sulphate
D  nickel hydrate
Answer:- A  pure lead
41. The specific gravity of an electrolyte is
measured with a ……
A pyrometer
B hydrometer
C thermometer
D galvanometer
Answer:- B hydrometer
42. 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
Answer:- A specific gravity

43. In a fully charged lead acid battery the
specific gravity is.............
A 1.26
B 1.20
C 1.18
D 1.15
Answer:- A 1.26
44. 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
Answer:- C   1.7 V

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

46. 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
Answer:- D  copper loss


47. Transformer lamination thickness for 50 HZ
is.............
A 0.25 mm
B 0.24 mm
C 0.23 mm
D  0.22 mm
Answer:- A 0.25 mm
48. Primary winding has 450 turns and
secondary winding has 90 turns. What wilt be
the secondary voltage if primary voltage is
220 volt?
A   45 volt
B   44 volt
C   42 volt
D   40 volt
Answer:- B   44 volt

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