WIREMAN MULTIPLE CHOICE QUESTIONS (MCQ)

WIREMAN MULTIPLE CHOICE QUESTIONS (MCQ)

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

An electrical component with resistance and
inductance elements with draw ……
(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
(b) Pie chart
(c) Curve
(d) Waveform
Answer:  (d) Waveform

The Capacitive Reactance.........
(a) Decreases as frequency increases
(c) Increases as frequency increases
(b) Applies only to series RLC circuits
(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

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
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To work on line wire the electrician should use ….
(a) Goggles
(b) Gloves
(c) Helmet
(d) Watch
Answer:  (b) Gloves

To rescue a victim from electrical shock, one should use -
(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
 (c) Side view
(d) 3D - view
Answer: (d) 3D - view

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
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The magnitude of the induced EMF in a coil is
directly proportional to the change of flux
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

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

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
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The flux density is measured in..................
(a)Tesia
(b) Weber
(c) Ampere-turn
(d) Maxwell
Answer: (a)Tesia

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

ELECTRICIAN

ELECTRICIAN

The graph between on alternating quantity

and time is called
(a) Bar graph

(b) Pie chart

(c) Curve

(d) Waveform

Answer:  (d) Waveform

The Capacitive Reactance.........

(a) Decreases as frequency increases
(c) Increases as frequency increases

(b) Applies only to series RLC circuits
(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

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

To rescue a victim from electrical shock, one should use -
(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

 (c) Side view

(d) 3D - view

Answer: (d) 3D - view

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...............

(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

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

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

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

ELECTRICIAN

ELECTRICIAN
In a simple circuit consisting of a resistor of value R,

when voltage V is kept constant, then
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

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

(d) 200 ms

Answer :  (a) 30 ms

Which of the following materials is a good Insulator?
(a) Aluminium

(b) Copper

(c) Porcelain 

(d) Silver

Answer: (c) Porcelain 

Which of the following materials is a good conductor?
(a) Mica

(b) Copper

(c) Rubber

(d) Ebonite

Answer:  (b) Copper

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

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

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

An electrical component with resistance and

inductance elements with draw ……
(a) Leading pf Current

(b) Lagging pf Current

(c) Unity lpf Current

(d) Zero pf Current -

Answer:  (b) Lagging pf Current

ELECTRICIAN

ELECTRICIAN

A 3-phase synchronous motor connected to
AC mains is running at full load and unity
power factor. If its shaft load is reduced by half,
with field current held constant, its new
power factor will be.........
(a) Unity
(b) Leading
(c) Lagging
(d) Dependent upon motor parameters
Answer: (b) Leading
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The starting torque of slip-ring induction motor
can be increased by inserting a suitable ……..
in series with the rotor circuit of the motor,
(a) Capacitor
(b) Resistance
(c) Inductor
(d) Overload relay
Answer: (b) Resistance

The Growler instrument is made in ...............
type of iron core.
(a)  E & I
(b) Shell
(c) T&U
(d) H
Answer: (d) H

The voltage regulation of an alternator with power
factor of 0.8 lagging is ……. at unity power factor.
 (a) Greater than
(b) The same as
(c) Smaller than
(d) 100%
Answer: (a) Greater than
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A ceiling fan uses.......
(a) Capacitor start motor
(b) Universal motor
(c) Capacitor start and capacitor run motor   
(d) Split-phase motor
Answer: (a) Capacitor start motor

The voltage regulation of an alternator is larger
than that of a DC generator because of ..................
(a) Large armature resistance
(b) Large leakage reactance
(c) Complex effects of armature reaction
(d) Small armature resistance
Answer: (c) Complex effects of armature reaction

[f the excitation an alternator operating in
parallel with other alternators, is increased
above the normal value of excitation, its .........
(a) Output current decreases
(b) Power factor becomes more lagging
(c) Power factor becomes more leading
(d) Output KW decreases
Answer: (b) Power factor becomes more lagging

ELECTRICIAN

ELECTRICIAN

The electrical wiring in factories and industries
is done by.........,.
(a) Cleats
(b) Casing capping
(c) Surface metal conduit
(d) Surface PVC conduit
Answer: (c) Surface metal conduit

The magnetic operating limit of C-type of
MCB’s is..........times of the rated current.
(a) 5 to 10
(b) 20 to 30
(c) 3 to 5
(d) 10 to 20
Answer: (a) 5 to 10
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Which one of the following lamps has the
longest operating life?
(a) LED lamp
(b) Fluorescent tube light
(c) CFL
(d) Incandescent lamp
Answer: (a) LED lamp

When the Growler is connected with 230 V,
AC supply and armature is placed over it,
the arrangement behaves like a....................
(a) Potential Divider
(b) AC Motor
(c) Transformer .
(d) DC Bridge
Answer: (c) Transformer
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A motor normally fitted to a domestic
vacuum cleaner is.............motor.
(a) Universal
(b) Cage Induction
(c) Wound rotor
(d) Shunt Wound
Answer: (a) Universal

The type of single-phase induction motor
 having the highest power factor at full load
is....:..............
(a) Shaded pole type
(b) Split-phase type
(c) Capacitor-start type
(d) Capacitor-run type
Answer: (d) Capacitor-run type

The method of braking an induction motor by
interchanging the supply to two of the
stator phase windings is called..................
(a) Plugging
(b) Stopping
(c) Commutation
(d) Retarding
Answer: (a) Plugging

If a three phase induction motor is switched on with
one phase disconnected, the motor will ................
(a) Run at low speed
(b) Burn Out
(c) Run at High Speed
(d) Not Run
Answer: (b) Burn Out
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The running of induction motors at slow and
steady speed much less than the actual
speed  is known as.
(a) Crawling
(b) Damping,
(c) Sinking
(d) Ageing
Answer: (a) Crawling
The distribution of load between two alternators
operating in parallel can be changed by
changing...............
(a) Phase sequence .
(b) Field excitation of alternators
(c) Current direction
(d) Driving torques of prime movers
Answer: (d) Driving torques of prime movers