2018
FEBRUARY ELECTRICIAN THEORY SEMESTER-I
1. The
forbidden energy gap
for
germanium is ................
a) 0.3eV
.
b) 3.5 eV
c) 0.72eV
d) 1.1 eV
ANSWER:- c) 0.72eV
2. The
bandgap of silicon
at room
temperature is ........
a) 1.3eV
b) 0.7eV
c) 1.1 eV
d) 1.4eV
ANSWER:- c) 1.1 eV
3. The
earth wires are
made of
.......
a) Copper
b) Aluminium
a) Copper
b) Aluminium
c) Iron
d)
Galvanized stranded
steel
ANSWER:- c)
Iron
4. The
rating of fuse is
always
expressed in .....
a)Volts
b)
Amperes
c)
Ampere-volts
d) Ampere
hours
ANSWER:- b)
Amperes
5. A fuse
is .....
a) Always
connected in
series
with the circuit
b) Always
connected in
parallel
with the circuit
c)
Normally connected in
series
with the circuit
d)
Normally connected in
parallel
with the circuit
ANSWER:- a)
Always
connected
in series with the
circuit
6. The size of conductor
used in
power cables
depends on
.........
a)
Operating voltage
b) Power
factor
c)
Current to be carried
d) Type
of insulation used
ANSWER:- c)
Current to be
carried
7. Ohm's
law is applied to ........
a)
Semiconductors
b)
Electrolytes
c) Carbon
resistors
d) All of
these
ANSWER:- c)
Carbon resistors
8. Two
wires A and B of the
same
material and length
L and 2L
have radius R and 2R
respectively.
The ratio of their
specific
resistance will be .............
a)
1:1 b) l:2 c) 1:4
d) 1:8
ANSWER:- b)
l:2
9. Ideal
voltage sources
have .............
a) Zero internal resistance
c) Low value of current
a) Zero internal resistance
c) Low value of current
b)
Infinite internal resistance
d) Large value of emf
d) Large value of emf
ANSWER:- a)
Zero internal resistance
10. Kirchhoff
s laws are
valid for .....
a) Linear circuit only
c) Nonlinear circuits only
a) Linear circuit only
c) Nonlinear circuits only
b)
Passive time invariant circuits
d) Both linear and nonlinear
d) Both linear and nonlinear
circuits
ANSWER:- d)
Both linear and
nonlinear circuits
11. The
unit of impedance is .....
a) Ohms
b)
Siemens
c) Mho
d) Henry
ANSWER:- a)
Ohms
12. The
value of peak factor of a
sinusoidal
waveform is .......
a) Zero b) 1 c)1.11 d) 1.41
a) Zero b) 1 c)1.11 d) 1.41
ANSWER:- d)
1.41
13. The
algebraic sum of incoming
current
is equal to the sum of
outgoing
current statement of .....
a)
Kirchoff' s current law
b)
Kirchoff' s voltage law
c) Ohm's
law
d) Joule's
law
ANSWER:- a)
Kirchoff' s current law
14. A 12
V battery under fully
charged
condition has open
circuit
voltage of.....
a) 12V
a) 12V
b) <12V
c) >12V
d) <12V
ANSWER:- d)
<12V
15. A
100W, 220 volt lamps takes
a current
of-
a) 5/11 A
b)2.2A
c) 0.22 A
d) 5/22 A
ANSWER:- a)
5/11 A
16. The
r.m.s. value of sinusoidal
alternating
current is given by
the
relation .....
a)
/2
a)
/2
b) 0.637
c) 2/
/
d)
ANSWER:-
17. In a
pure inductive A.C.
circuit
............
a)
Voltage leads the current
vector by 90°
b)
Voltage legs the current
vector by 90°
c) Current leads the voltage
c) Current leads the voltage
vector by 90°
d)
Current is in phase with the
voltage vector
ANSWER:- a)
Voltage leads the
current vector by 90°
18.
Primary battery is such a
battery ........
a) Which
can be recharged
b) Which
cannot be reconditioned
by replacing chemical
c) Which
cannot be reused
d) Which
cannot be recharged
ANSWER:- d)
Which cannot
be recharged
19.
Internal resistance of a battery
cell increases with ......
a)
Increases in concentration of
electrolyte
b)
Increase in distance between two
electrodes
c)
Increases in area of the plates
inside the electrolyte
d)
Increase in size of the electrodes
ANSWER:- b)
Increase in distance
between
two electrodes
20. If
cells are connected in series,
then .......... will increase.
a)
Current
b)
Voltage
c) Power
d) Energy
ANSWER:- b)
Voltage
21. 
If Z
If Z
is the
electro - Chemical equivalent
of a
substance of the electrolyte.
E is the chemical
equivalent of the
same
substance, then the relation
between Z & E will be ......
a) Z
E
a) Z
E
b) Z =
E
c) Z <
E
d) Z >
E
ANSWER:- a)
ZE
E
22. Negative
electrode or anode
of simple
voltaic cell is made of....
a) Copper
b) Zinc
c) Lead
d) Carbon
ANSWER:-
23. E.C.E
stands for.....
a)
Electrovalent chemical equivalent
b)
Electrolysis cathode equivalent
c)
Electro chemical equivalent
d) None
of these
ANSWER:- c)
Electro chemical
equivalent
24. Resistivity
of metals is expressed
in terms
of.....
a)µΩ
b) µΩ-cm/ °C
c) µΩ - cm
d) Ω
ANSWER:- c) µΩ - cm
25. Permittivity
of free space is
equal to
.....
a) 8.84xlO¯¹²F/m
b) 8.84x10¯¹³F /m
c) 8.84.x 10¯¹¹F/m
d) 8.84x 10¯¯¹°F/m
ANSWER:- a) 8.84xlO¯¹²F/m
26. Which
resistor will be physically
larger in
size? .......
a) 100 Ω, 10 W
b) 10 Ω, 50 W
c) 1 MΩ, 1/2 W
a) 1 kΩ, 1 W
ANSWER:- b)
10 Ω, 50 W
27. Two
resistor are said to be
connected in-parallel when -
a) Same
current passes in turn
through both
b) Both
carry the same value
of current
c)
Voltage across each resistance
are same
d)
Voltage across each resistance
are
not same
ANSWER:- c)
Voltage across each
resistance are same
28. The
electrical resistance of
human body is around .....
a) 5 ohms
b) 25
ohms
c) 250
ohms
d) 1000
ohms
ANSWER:- d)
1000 ohms
29. A3 Ω resistor having 2A current
will dissipate the power of.....
a)2W
b)4W
c)8W
d) 12 W
ANSWER:- d)
12 W
30. The
filament of an electric
bulb is
made of......
a) Carbon
b) Nickel
c) Aluminium
d) Tungsten
ANSWER:- d)
Tungsten
31. An
current of 6 A is same as ...
a) 6
Joule / Second
b) 6
Coulomb / Second
c) 6 Watt
/Second
d) None
of these
ANSWER:- b)
6 Coulomb / Second
32. The
equation of alternating
current
is i=42.4 sin 621t. Then
the
average value of current
a) 42.42A
a) 42.42A
b) 27 A
c) 38 A
d) 22A
ANSWER:- b) 27 A
33. The
rms value of a half wave
rectified
symmetrical square wave
current
of 2 A by.......
a) 0.707
A
b) 1 A
c) 1.414
A
d) 1.732
A
ANSWER:- c)
1.414 A
34. A
capacitor stores 0.24
coulombs
at 10 volts. Its
capacitance
is .......
a) 0.024
F
b) 0.12 F
c) 0.60 F
d) 0.80 F
ANSWER:- a)
0.024 F
35. If
the sheet of a backelite is
inserted between the plates of
an air
capacitor, the capacitance
will
.........
a)
Decrease
b)
Increase
c)
Becomes zero
d)
Remains unchanged
ANSWER:- b)
Increase
36. Three
capacitors each of
capacity
C are given. The resultant
capacity
(2/3) C obtained by
using
them ..........
a) All in
series
b) All in
parallel
c) Two in
parallel and third in series
with this combination
d) Two in
series and third in parallel
across this combination '
ANSWER:- c)
Two in parallel and
third in
series with this combination
37. The
power dissipated in a pure
capacitor
is ........
a) Zero
b)
Proportional to applied voltage
c)
Proportional to the value of capa
citance
d) Both
(b) & (c)
ANSWER:- a)
Zero
38. Three
element having conductance
Gb G2 and
G3 are connected in
parallel.
Their ' combined conductance
will be
.....
a) ( + + )¯¹
+ + )¯¹
b) + +
+ +
c) 1/+ 1/ + I/ ₁
+ 1/ + I/ ₁
d) (1/+ 1/ + I/) ¯¹
+ 1/ + I/) ¯¹
ANSWER:- b) + +
+ +
39. Which
of the following materials
has
highest electrical conductivity?
a)Steel
b)
Aluminium
c) Copper
d) Silver
ANSWER:- d)
Silver
40. If the phase angle between
voltage
and current of a l-Ф AC
current
is 60°, then factor is the
circuit
is ......
a) 0.2
b) 0.5
c) 0.707
d) 1.0
ANSWER:- b) 0.5
41. The
current in the resistor R
shown in
Figure will be ......
a) 0.2 A
b) 0.4A
c) 0.6A
d) 0.8A
ANSWER:-
42. Which
of the following has
positive
temperature coefficient?
a) Germanium
a) Germanium
b) Gold
c) Paper
d) Rubber
ANSWER:- b)
Gold
43. Which
law(s) find application
in
electrolysis?
a) Ohms'
law
b)
Gauss's law
c)
Faradays' law
d)
Coulomb s
ANSWER:- c)
Faradays' law
44. Silver
coating is provided for ...
a)
Protective purpose .
b)
Decorative purpose
c)
Bearing surface
d) All of
these
ANSWER:- d)
All of these
45. The
permanent magnets are
made from
which of following
materials?
a) Soft
iron
b)
Ferromagnetic
c)
Paramagnetic
d)
Diamagnelic
ANSWER:- b)
Ferromagnetic
46. The
Biot-savarfs law is a
general
modification of......
a)
Kirchhoff s law
b) Lenz's
law
c)
Ampere's law
d)
Faradays' law
ANSWER:- c)
Ampere's law
47. 1
Maxwell is the same as ...
a) weber
weber
b) 
weber
weber
c) 
weber
weber
d) 
weber
weber
ANSWER:- b)
weber
weber
48. The
direction of induced
emf can
be found by .....
a)
Laplace's law
b)
Kirchhoff's
voltage
law
c) Lenz's
law
d)
Fleming's right hand rule
ANSWER:- d)
Fleming's right
hand rule
49. A
closed switch has a
resistance
of ......
a) Zero
b) About 50 ohms
c) About
500 ohms
d)
Infinite
ANSWER:- a)
Zero
50. The energy stored in an
inductor of inductor L Henry
is
represented as ......
a)
L
a)
L
b) 
c) (l/2)L
d) 
/i
/i
ANSWER:- c) (l/2)L
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