1)
Transformer
works under the principle of ______________
a)
Electronic
induction
b) Electromagnetic mutual Induction
c)
Both
of them
d)
None
of them
Ans: - b
2)
What
is the purpose of a filter in the power supply?
a) To convert the pulsating DC into a smooth
DC.
b)
To
convert the pulsating DC into a varying AC
c)
To
convert the varying AC into a pulsating DC.
d)
To
convert the smooth DC into a pulsating DC.
Ans: - a
3)
P-type
semiconductor material has a /an
a)
Excess
of electrons
b)
Excess
of neutrons
c) Deficiency of electrons
d)
Deficiency
of protons
Ans: - c
4)
Barrier
potential for Si diode is –
a)
0.3 v
b)
0.9 v
c) 0.7 v
d)
0.5 v
Ans: - c
5)
Common
Base (CB) amplifier, amplifies ___________
a)
Current
b)
Power
c) Voltage
d)
None
of them
Ans: - c
6)
Ripple
factor of Half wave rectifier is –
a)
0.48
b) 1.21
c)
Both
of them
d)
None
of them
Ans: - b
7)
In the
correctly based transistor, the base-emitter junction is ______________ biased,
while the base-collector junction is ____________ biased.
a) Forward, reverse.
b)
Forward,
forward
c)
Reverse,
forward
d)
Reverse,
reverse
Ans: - a
8)
Capacitance
is ____________ proportional to the spacing between the plates.
a)
Directly
b)
Indirectly
c)
Have
no relation
d) None of the above
Ans: - d
9)
Efficiency
of a rectifier is 80.6%. The rectifier is ___________. (Multiple choice)
a)
Half
wave
b) Full wave rectifier
c) Bridge rectifier
d)
All of
them
Ans: - b, c
10)
Bridge
rectifier has _______ diode/s.
a)
1
Diode
b)
2
Diodes
c)
3
Diodes
d) 4 Diodes
Ans: - d
11)
An
example of pentavalent Impurity is ____________.
a) Arsenic
b)
Boron
c)
Gallium
d)
Pentium
Ans: - a
12)
___________
configuration in transistor is used for power amplification.
a)
Common
Collector
b)
Common
Base
c) Common emitter
d)
None
Ans: - c
13)
In the
common emitter the output signal is _______ degree out of phase with the input
signal.
a) 180
b)
90
c)
45
d)
360
Ans: - a
14)
Find
the total current in following figure
a)
2mA
b)
4mA
c) 3mA
d)
5mA
Ans: - c
15)
The
equivalent resistance of the following circuit is
a) 5 K ohm
b)
3 K
ohm
c)
2 K
ohm
d)
6 K
ohm
Ans: - a
16)
Capacitor
input filter or pie filter consists of
a)
One
capacitor
b) Two capacitors and one choke
c)
One
capacitors and one choke
d)
Two
capacitors and two chokes
Ans: - b
17)
Common
collector (CC), amplifies ___________
a)
Power
b) Current
c)
Voltage
d)
None
of them
Ans: - b
18)
Which
semiconductor materials are used in LED? (Multiple
choice)
a) Gallium Arsenide Phosphide
b)
Carbon
c) Gallium Phosphide
d)
None
of the above.
Ans: - a, c
19)
What
is the voltage between terminals A and B in following Figure?
a)
3.0
volts
b)
4.5
volts
c)
6.0
volts
d) 9.0 volts
Ans: - d
20)
LED emits
light when the holes and electrons near its junction:
a)
Separate
b) Recombine
c)
Are
forced to flow away from the junction
d)
Are
forced to flow towards the junction without recombining.
Ans: - b
21)
State
whether following statement is true or false.
“The photodiode is
most commonly subjected to a forward bias voltage.”
a)
True
b) False
Ans: - b
22)
Phototransistor
is widely used in: (Multiple
choice)
a)
Door
bell
b) Smoke and flame detector
c) Object counting
d) Mechanical positioning and moving systems
Ans: - b, c, d
23)
What
is the total resistance of the circuit across terminal A and B of following
figure?
a)
28 Ω
b)
12 Ω
c)
45 Ω
d) 24 Ω
Ans: - d
24)
What
is the current shown in the following figure?
a)
0.02 A
b)
20 mA
c) 200 mA
d)
2 mA
Ans: - c
25)
From
the following options, which are the best conductors? (Multiple choice)
a) Silver
b)
Wood
c) Copper
d)
Plastic
Ans: - a, c
26)
State
whether the following statement is true or false.
“The outermost
shell of any atom is called as valence shell.”
a) True
b)
False
Ans: - a
27)
A
valence shell is considered “filled” when it contains ___ electrons.
a)
4
b) 8
c)
16
d)
32
Ans: - b
28)
The
total resistance in a parallel circuit must be ___________ any individual
resistance in the circuit.
a) Less than
b)
Equal
to
c)
Greater
than / equal to
d)
Greater
than
Ans: - a
29)
In
Ohm’s law the current is __________ proportional to resistance.
a) Inversely
b)
Directly
Ans: - a
30)
If the
0.2 mA current passes through a resistor of 12 KΩ, how much voltage will get
developed across the same resistor?
a)
24V
b)
240V
c) 2.4V
d)
0.24V
Ans: - c
31)
_______
current flows through a 10Ω resistor when 5V is applied.
a)
5A
b)
5mA
c)
0.5mA
d) 0.5A
Ans: - d
32)
State
whether following statement is true or false
“The sum of the
voltage drops is always equal to sum of voltage rise.”
a) True
b)
False
Ans: - a
33)
In
full wave rectification, if the input frequency is 50Hz, then what will be the
output frequency?
a)
10Hz
b) 50Hz
c)
25Hz
d)
100Hz
Ans: - b
34)
In a transistor
the ____________ is lightly doped.
a)
Emitter
b)
Collector
c) Base
d)
Cathode
Ans: - c
35)
In a
transistor the emitter is _________ doped
a) Heavily
b)
Lightly
c)
Moderately
d)
None
of the above.
Ans: - a
36)
LED
converts electrical energy into ________ energy.
a)
Heat
b)
Chemical
c)
Sound
d) Light
Ans: - d
37)
Conductance
G is equal to
a)
R/R
b)
R*R
c) 1/R
d)
None
of them
Ans: - c
38) V = ________
a)
I/R
b)
I2R
c)
R/I
d) IR
Ans: - d
39)
If
value of R is 84 KΩ, + 5% then the color code is
a)
Green,
Orange, Red,
Silver
b) Grey, Yellow, Orange, Gold
c)
Green,
Orange, Red,
Gold
d)
Grey,
Yellow, Orange,
Silver
Ans: - b
40)
If V =
5v, R = 1 KΩ, then I =?
a)
5A
b)
50A
c) 5 mA
d)
0.5 mA
Ans: - c
41)
Ammeter
is always connected in _________
a) Series
b)
Parallel
c)
Star
d)
Shunt
Ans: - a
42)
Which
of the following is a soldering tool? (Multiple
choice)
a)
Pleezer
b) Tweezers
c)
Bleezer
d) Solder gun
Ans: - b, d
43)
When
we increase resistance keeping voltage constant; the current will __________.
a) Decreased
b)
Same
c)
Increased
d)
Doubled
Ans: - a
44)
Ohm’s
law is (Multiple
choice)
a)
V =
R/I
b) V = IR
c)
I = VR
d) I = V/ R
Ans: - b, d
45)
If
total resistance is sum of all resistors then connection will be in
___________.
a)
Shunt
b) Series
c)
Parallel
d)
Star-delta
Ans: - b
46)
Do not
sit under _________ while soldering.
a)
Light
b)
Roof
c) Fan
d)
None
of them
Ans: - c
47)
Capacitance
is ____________ to the dielectric constant.
a)
Same
as
b) Directly proportional
c)
Inversely
proportional
d)
None
of them
Ans: - b
48)
The
act of recovering the energy is called __________ the capacitor.
a)
Transferring
b)
Releasing
c)
Charging
d) Discharging
Ans: - d
49)
The
voltage at any particular point on the waveform is generally referred to as
_____________.
a)
Peak
value
b)
Average
value
c)
Effective
value
d) None of them
Ans: - d
50)
If an
atom of potassium contains 19 electrons; then how many electrons would be there
in last shell?
a) 1
b)
4
c)
8
d)
9
Ans: - a