FEB 2018
ELECTRICIAN
THEORY
SEMESTER-3
PART-2
26. Gas
filled in a tube starter
is ....
a) Argon
b) Helium
a) Argon
b) Helium
c) Neon
d) None
of these
Answer:- b) Helium
27.
Condenser is used in tube
circuit
to ......
a) To
improve the P.F
b) To
improve the voltage
c) To
safeguard the tube
d) To
give full light
Answer:- a) To improve the P.F
28. The
inner side colour of the
Reflector
is .......
a) Black
b) White
c) Any
Dark
d)None of
these
Answer:- b) White
29. In a
power house, Illumination
should be
approximately.......
a) 20-40
Lumen/M²
b) 80-90
Lumen/M²
c)
100-150 Lumen/M²
d)
200-250 Lumen/M²
Answer:- c) 100-150 Lumen/M²
30. In
parking lots, illumination
height
should be approximately
a) 8 Lumen/M³
a) 8 Lumen/M³
b) 10 Lumen/M³
c) 12
Lumen/M³
d) 80
Lumen/M³
Answer:- c) 12 Lumen/M³
31. When
a rotating machine
is observed under a gas discharge
lamp, it
appear to be cither stationary
or seams
to be running in reverse
direction.
What is reason for it .......?
a) Argon
b) Helium
c) Neon
d) None
of these
Answer:- d) None of these
32. The
circuit of tube starter
has
condenser which ......
a) Reduce
the spark
b)
Improves power factor
c) Limit
the current
d) Reduce
the stroboscope effect
Answer:- a) Reduce the spark
33. The
diameter of electrode in
a D.C arc
lamp is .....
a)
Positive electrode very thick
b)
Negative electrode very thick
c)
Positive electrode very thin
d) Both
similar
Answer:- a) Positive electrode
very thick
34. Voltage used in D.C arc
lamp
is.......
a) 40-60V
b)80-110V
c)
180-210 V
d)
220-250 V
Answer:- a) 40-60V
35. The
threaded portion on the
outer
side of the edison screw
type lamp
holder should be
connected with ........
connected with ........
a)
Neutral wire of the circuit
b) Phase
wire of the circuit
c) Half
wire of the circuit
d) Earth
wire of the circuit
Answer:- a) Neutral wire of the
circuit
36. The
working temperature
of a gas
filled tungsten filament
lamp is ........
a) 1035°c
a) 1035°c
b) 1200°c
c) 1500°c
d)2300°c
Answer:- d)2300°c
37. Rotary converter is
generally
available in .....
a) Single
phase
b) Three
phase
c) Both
(a) & (b)
d) Twelve
phase
Answer:- b) Three phase
38.
Mercury arc rectifier
anodeis
made up of ....
a) Carbon
b)
Graphite
c)
Both(a)&(b)
d) None of
these
Answer:- b) Graphite
39.
......... is also known
as hote
cathode rectifier.
a) Copper
oxide rectifier
b) Tunger
bulb rectifier
c)
Mercury arc rectifier
d) None
of these
Answer:- a) Copper oxide rectifier
40.
Machine which converts
A.C into
D.C is known as ......
a)
Convener
b)
Inverter
c) Both
(a) & (b)
d) None
of these
Answer:- a) Convener
41. In a full wave rectifier,
ripple
frequency is equal
to
........
a) 2 F
input
b) 3 F
input
c) Both
(a) & (b)
d) None
of these
Answer:- a) 2 F input
42. Which
method is used to
make a
full wave rectifier?
a) Bridge
method
b) Center
tap method
c)
Both(a)&(b)
d) None
of these
Answer:- c) Both(a)&(b)
43.
Rectification is of how
many
types .......
a) One
b)Two
c) Three
c) Three
d) Four
Answer:- b)Two
44. The
supply in Growler
is ......
a) DC
b) AC
c) Both
(a) & (b)
d) None
of these
Answer:- b) AC
45. The
number of coils per
group in
balanced winding
is .........
a) Same
b)
Unequal
c) Both
(a) & (b)
d) None o
f these
Answer:- a) Same
46. The mostly used winding
for
rewinding is ........
a) Basket
winding
b) Chain
winding
c)
Concentric winding
d) None
of these
Answer:- a) Basket winding
47. For
earth with testing volt meter
when
connected to commutator
segment
and body of an amature,
the
growler is connected to A.C.
supply.
The milli voltmeter should
read
.......
a) No
reading
b) Low
reading
c)
Infinity
d) More
reading
Answer:- c) Infinity
48. The
number of slots with
respect
of number of coils in
double
layer winding is ....
a) Same
a) Same
b) Less
c) More
than one
d) Half
Answer:- a) Same
49. Pitch
factor in full pitch
winding
is .......
a) One
b) Less
than one
c) More
than one
d) None
of these
Answer:- a) One
50. The
numbers of windings in
double cage induction motors
a) One
a) One
b)Two
c) Three
c) Three
d)Four
Answer:- b)Two
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