41.
Circular breaker indented for rapid auto re-closing with rated operating duty
o-m-co in which m represents
(a) Making
(b)
Breaking
(c) Dead
time
(d) Re
closing
42. The
heat produced by an electric heating element is according to
(a) Ohm’s
law
(b)
Stefan’s law
(c)
Faraday’s law
(d)
Snell’s law
43. Ajax
Wyatt furnace make use of a crucible in
(a)
Horizontal
(b) At an
angle of 120 degree
(c)
Vertical
(d) None
of the above
44. High
frequency capacitance heating method is employed for heating
(a)
Plastic
(b) Wood
(c)
Dehydration of food
(d) All
the above
45. In
carbon arc welding, the carbon electrode with respect to work is
(a)
Negative
(b)
Positive
(c) As
positive or negative
(d) None
of the above
46. The
filament lamp work at a pf of
(a) 0.5
(b) 1
(c) 0.7
(d) 0
47. Which lamp has the highest luminous
efficiency?
(a)
Filament
(b) Neon
(c)
Mercury vapor
(d) Sodium
vapor
48. in
illumination space to height ration is
(a) 1 to 2
(b) 1
(c) Less
than 1
(d) None
of the above
49. The
induction motor cannot run at synchronous speed because if so
(a) Rotor
emf would be zero
(b) Rotor
current would be zero
(c) Rotor
torque would be zero
(d) All of
the above
50. Semi
closed or totally closed slots are used in 30 Induction Motor essentially to
(a) Reduce
magnetizing current
(b)
Increase efficiency
(c)
Improve staring torque
(d)
Increase magnetizing current
51. In DC
machine the armature windings are placed on the rotor for effective
(a)
Generation of voltage
(b)
Development of torque
(c)
Commutation
(d) Energy
conversion
52. The
most powerful electromagnet in a normal DC machine operating at full load
condition is
(a) Field
winding
(b) Armature
winding
(c) Inter
pole winding
(d)
Compensating winding
53. Which
of the following is called as stray flux
(a)
Armature flux
(b) Field
flux
(c)
Leakage flux
(d) None
of the above
54. When a
coil moves through a time varying flux, the induced emf present in the coil is
(a)
Dynamically induced
(b)
Statically induced
(c)
Motional emf
(d) Both
dynamically and statically induced
55. A 30
SCIM stator rewound for 6 poles without any alteration in the rotor will run at
sapped
(a) <
1000 rpm
(b) <
1500 rpm
(c)
<1200 rpm
(d) 0 rpm
56. A 30
star connected IM takes 20A from supply. When connected in delta, the motor
will take a current of
(a) 20v 3A
(b) 20/v’
3A
(c) 20A
(d) 10A
57. The
armature core of a DC machine is laminated to minimize
(a)
Hysteresis loss
(b) Eddy
current loss
(c)
Mechanical loss
(d)
Temperature loss
58. Which
part of a DC motor has the maximum flux
(a) Pole
core
(b)
Interpole
(c)
Leading pole tip
(d)
Trailing pole tip
59. The
air blast circuit breaker have best application in system of operating voltage
(a) Below
132 KV
(b) 132 KV
to 400 KV
(c) Above
400 KV
(d) None
of the above.
60. The
cheapest shielding material used in Nuclear plant is
(a)
Concrete
(b) Brick
(c) Boron
(d)
Cadmium
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