ELECTRICIAN THEORY SEMESTER-1 JULY 2018
When a capacitor is charged
through a DC supply
source for infinite time, the
final current through it is -
(a) Determined by the resistor
(b) Half of the initial current
(c) Infinite
(d) Zero
Answer : (d)
Zero
The Electronic grade solder has a Tin: Lead ratio of....
(a) 40:60
(b) 60:40
(c) 35:65
(d) 70:30
Answer : (b) 60:40
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Generally battery containers are
made with -
(a) Hard Rubber
(b) Hard Plastic
(c) Polypropylene
(d) None of these
Answer : (c) Polypropylene
The sheath is used in cables
to.................
(a) Provide strength to the cable
(b) Provide proper insulation
(c) Prevent moisture from
entering the cable
(d) Avoid chances of corrosion on
strands
Answer : (a) Provide strength to the cable
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Load of an electrical network
determines -
(a) Resistance
(b) Impedance
(c) Current
(d) Voltage
Answer : (c) Current
The capacitors are used across AC
supply for.................
(a) Power improvement
(b) Power factor improvement
(c) Current improvement
(d) Voltage improvement
Answer : (b) Power factor
improvement
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Which of the following bulbs will
have the least resistance?
(a) 230 V, 60 W
(a) 230 V, 60 W
(b) 230 V, 100VV
(c) 115V.60W
(d) 115V, 100W
Answer : (d) 115V, 100W
The phenomenon of induced
magnetism lagging
behind the magnetizing force is
known as ……
(a) Eddy currents
(b) Hysteresis
(c) Reluctance
(d) Permeability
Answer : (b) Hysteresis
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The..............are tools used
for bending, seaming and
forming of sheet metal that
cannot be done on any
regular machine
(a) Snips
(b) Vices
(c) Stakes
(d) Centre Punch
Answer : (c) Stakes
In full wave rectifiers the current rating of each
diode is ...... to /of the DC
output current.
(a) Equal
(b) Half
(c) Double
(d) Three times
Answer : (b) Half
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The type of switch used in
Staircase wiring is............
(a) Rotary Switch
(b) Push Button
(c) Two Way Switch
(d) One Way Switch
Answer : (c) Two Way Switch
When the core becomes
magnetically saturated,
the increase in magnetic field
strength H
(a) Enhances B drastically
(b) Decreases the permeability of
the core
(c) Increases the permeability of
the core
(d) Almost has no effect on
magnetic induction B.
Answer : (d) Almost has no effect on magnetic
induction B.
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The nominal voltage of Lead-acid cell in an open
The nominal voltage of Lead-acid cell in an open
circuit is approximately…….
(a) 2 Volts
(a) 2 Volts
(b) 1.5 Volts
(c) 1,25 Volts
(d) 2.5 Volts
Answer : (a) 2 Volts
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While selecting a fixed value resistor, its main
While selecting a fixed value resistor, its main
specifications to be considered
are....
(a) Voltage, wattage and
tolerance in percents.
(b) Voltage, Current and Size
(c) Value in Ohms, Voltage and
size
(d) Value in Ohms, Wattage and
tolerance of its value
Answer : (d) Value in
Ohms, Wattage and
tolerance of its value
The specific gravity of a
Lead-acid battery's
electrolyte is measured by
(a) Hydrometer
(a) Hydrometer
(b) Barometer
(c) Hygrometer
(d) Pyrometer
Answer : (a) Hydrometer
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Power factor of a pure resistive circuit is.................
Power factor of a pure resistive circuit is.................
(a) Zero
(b) Lagging
(c) Leading
(d) Unity
Answer : (d) Unity
The function of the choke coil in
fluorescent
lamp circuit is.......
(a) Only to limit the operating
current
(b) Only to produce starting
voltage impulse
(c) To produce starting voltage
impulse and to
limit the operating current *
(d) To limit the heating cuitent
of filaments
Answer : (c) To produce
starting voltage impulse
and to limit the
operating current
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AC mains supply in India has the
frequency of..........
(a) 100 Hz
(b) 60Hz
(c) 50 Hz
(d) 40Hz
Answer : (c) 50 Hz
The fixed value Carbon Resistors
are generally
not more than......Watts.
(a) 10
(b) 6
(c) 4
(d) 2
Answer : (d) 2
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In an Inductive AC circuit,
current.,
(a) Lags behind the voltage by 180°
(b) Leads the Voltage by 90u
(c) Lags behind the Voltage by 90°
(a) Lags behind the voltage by 180°
(b) Leads the Voltage by 90u
(c) Lags behind the Voltage by 90°
(d) Is in phase with the Voltage
Answer : (c) Lags behind the Voltage by 90°
In a simple circuit consisting of a resistor of value R,
when voltage V is kept constant,
then
the current.,................
the current.,................
(a) I is a directly proportional
to R
(b) I=R
(c) I is inversely proportional
to R
(d) I is constant irrespective of
changes in R
Answer : (c) I is
inversely proportional to R
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The MCB's working is based
on.........................
(a) Thermal operation
(b) Thermal and Magnetic
operations
(c) Magnetic operation
(d) Simple Mechanical Switching
operation
Answer : (b) Thermal and
Magnetic operations
The tripping time of ELCBs is
usually less than.........
(a) 30 ms
(b) 80ms
(c) 100 ms
(c) 100 ms
(d) 200 ms
Answer : (a) 30 ms
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Which of the following materials
is a good Insulator?
(a) Aluminium
(a) Aluminium
(b) Copper
(c) Porcelain
(d) Silver
Answer: (c)
Porcelain
Which of the following materials
is a good conductor?
(a) Mica
(a) Mica
(b) Copper
(c) Rubber
(d) Ebonite
Answer: (b) Copper
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The electrolyte used in Aluminum
anodizing is dilute...........
(a) Nitric acid
(b) Aluminum sulphate solution
(c) Hydrochloric acid
(d) Sulphuric acid
Answer: (d) Sulphuric
acid
The positively charged ions are
called.................
(a) Cations
(b) Atoms
(c) Anions
(d) Neutrons
Answer: (a) Cations
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The..........of a substance is
the amount deposited
on the Electrode on passing a
steady electric current
of one ampere for One second
through its solution.
(a) Equivalent weight
(b) Atomic weight
(c) Electro chemical equivalent
(d) Chemical equivalent
Answer: (c) Electro
chemical equivalent
The............. circuit is
usually operated by
adjusting the variable resistor
until no current
flows in the ammeter.
(a) Resistors in parallel
(b) Resistors in series
(c) Wheatstone bridge
(d) Feedback
Answer: c) Wheatstone
bridge
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Certain materials normally behave
as insulators
but allow for more valence
electrons to be
made available by thermal energy.
These elements are known
as.........
(a) Semiconductors
(b) Conductors
(c) Insulators
(d) Conduction band
Answer: (a)
Semiconductors
The...................has a
hammer face which is
used to drive in nails and the
other end is
used for pulling out nails from
the wood.
(a) Mallet
(b) Claw Hammer
(c) Ball Pen Hammer
(d)Axe
Answer: (b) Claw Hammer
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An electrical component with
resistance and
inductance elements with draw ……
(a) Leading pf Current
(a) Leading pf Current
(b) Lagging pf Current
(c) Unity lpf Current
(d) Zero pf Current -
Answer: (b) Lagging pf Current
The graph between on alternating
quantity
and time is called
(a) Bar graph
(a) Bar graph
(b) Pie chart
(c) Curve
(d) Waveform
Answer: (d) Waveform
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The Capacitive Reactance.........
(a) Decreases as frequency
increases
(c) Increases as frequency increases
(c) Increases as frequency increases
(b) Applies only to series RLC
circuits
(d) Increases with the time constant
(d) Increases with the time constant
Answer: (a)
Decreases as frequency increases
Pure silicon crystal atoms contain............valance
electrons as a result of covalent
bonding.
(a) 2
(b) 4
(c) 8
(d) 16
Answer: (c) 8
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In case of electrical short
circuit of a sub-circuit in domestic connection -
(a) Throw water to extinguish the
fire
(b) Switch of the power supply
first
(c) Run to intimate the po wer
house
(d) Do not act
Answer: (b) Switch of
the power supply first
To work on line wire the
electrician should use ….
(a) Goggles
(b) Gloves
(c) Helmet
(d) Watch
Answer: (b) Gloves
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To rescue a victim from
electrical shock, one should use -
(a) Iron rod
(a) Iron rod
(b) Copper rod
(c) Wooden rod
(d) Aluminum rod
Answer: (c) Wooden rod
An isometric drawing present …..
(a) Top view
(b) Front view
(a) Top view
(b) Front view
(c) Side view
(d) 3D - view
Answer: (d) 3D - view
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The...................is the
maximum amount of
reverse voltage which can be
applied on a
diode before a breakdown point is
reached.
(a) Breakdown Voltage
(b) Zener Voltage .
(c) Peak Inverse Voltage
(d) Threshold Voltage
Answer: (c) Peak Inverse
Voltage
The magnitude of the induced EMF
in a coil is
directly proportional to the
change of flux
linkages. This law is known as...............
linkages. This law is known as...............
(a) Joule's law
(b) Faraday's second law of
electromagnetic induction
(c) Coulomb's law
(d) Faraday's first law of
electromagnetic induction
Answer: (b) Faraday's
second law of electromagnetic induction
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The...... .states that the
polarity of the induced
voltage will oppose the change in
magnetic
flux causing the induction.
(a) Joule's law
(b) Faraday's law
(c) Coulomb's law
(d) Lenz's law
Answer: (d) Lenz's law
The........,.........materials
have permeability
slightly less than'that of free space.
(a) Paramagnetic
(b) Diamagnetic
(c) Ferromagnetic
(d) Non-magnetic
Answer: (b) Diamagnetic
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The............is the property of
a magnetic material
which opposes the creation of
magnetic flux in it. .
(a) Resistance
(b) Reluctance
(c) Inductance
(d) Conductance
Answer: (b) Reluctance
The flux density is measured
in..................
(a)Tesia
(b) Weber
(c) Ampere-turn
(d) Maxwell
Answer: (a)Tesia
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The no load p.f. of a transformer
is around …..
(a) Unity
(b) 0.2 lagging
(c) 0.2 leading
(d) Zero
Answer: (b) 0.2 lagging
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