W/M S 1

WIREMAN 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
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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

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

Which of the following bulbs will have the least resistance?
(a) 230 V, 60 W
(b) 230 V, 100 W
(c) 115 V.60 W
(d) 115 V, 100 W
Answer : (d) 115 V, 100 W

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

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.

The nominal voltage of Lead-acid cell in an open
circuit is approximately…….
(a) 2 Volts
(b) 1.5 Volts
(c) 1,25 Volts
(d) 2.5 Volts
Answer : (a) 2 Volts

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
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The specific gravity of a Lead-acid battery's
electrolyte is measured by
(a) Hydrometer
(b) Barometer
(c) Hygrometer
(d) Pyrometer
Answer : (a) Hydrometer

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

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°
(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.,................
(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
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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
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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
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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

wireman july 15 sem 1

The fire extinguisher suitable for a line electrical fire is..................
A water'   B halon   C foam   D carbon dioxide

In the case of injuries, the suitable method of artificial respiration is given when the mouth is not able to open..................
A Nelson's artificial respiration
B Schafer's artificial respiration
C mouth to nose artificial respiration
D mouth to mouth artificial respiration

Tool used for cutting, twisting holding and gripping of a small job is..................
A  combination pliers  B  flat nose pliers
C  round nose pliers    D  side cutting pliers

Which one of the following material is NOT a good insulator?
A Plastic   B Copper   C Rubber   D Porcelain

The size of an engineer's vice is specified by its...................
A  height of the vice    B  width of the vice   C  maximum open of the jaws  D  length of the movable jaws

The unit of power is..............
A volt    B watt    C amp    D ohm

A 9 volt battery is connected to a 3 ohm resistor, then the current is..................
A   1 amp     B   2 amp     C   3 amp    D   4 amp

The spanner used in less space and higher lever required is..................
A  box spanner    B  ring spanner    C  double end spanner    D  adjustable spanner

Which electrical device is an example medium resistance?
A  Shunt resistance      B  Contact resistance
C  Heaters resistance    D Armature winding resistance

Which one is NOT an electrical conducting material?
A Glass    B Copper    C Aluminium   D Silver

In which material, if the temperature is increased then the resistance will decrease?
A Manganese   B Nichrome   C Carbon   D Tungsten

Which law states that the sum of currents meeting at junction is equal to zero?
A Coulombs law  B Ohms law  C Kirchhoffs voltage law  D Kirchhoffs current law

The increase in resistance per ohm per degree centigrade..............
A   difference in temperature   B   positive temperature co-efficient
C   linear co-efficient               D   negative temperature co-efficient

coil instrument works on the effect of..................
A chemical effect  B electromagnetic effect   C heating effect   D electrostatic effect

Material used in permanent magnet is...................
A  silicon steel  B  wrought iron  C  alnico   D  y- alloy

The division of the scale on the moving iron instrument is....................
A initially crowded gradually widen scale    B initially widen gradually crowded scale
C uniformaily graduated scale                     D not uniformaily graduated scale

Which type of tool is used for making holes on wooden articles?
A Poker  B Gimlet  C Bradawl  D Scriber

in which type of accessory the intermediate switch belongs?
A   Holding accessories          B   Safety accessories
C   Controlling accessories     D  Outlet accessories

Tree system of wiring suitable for.............
A   single storeyed building        B   multi storeyed building
C  industrial wiring installation  D   cinema hall wiring

The colour of light emitted by sodium vapour lamp is..........
A  yellowish light    B  bluish light   C  reddish light  D  greenish light

Type of wiring system suitable for installation of motor with TPIC main switch is...........
A  rigid metal conduit    B   flexible metal conduit
C   PVC conduit wiring  D  PVC channel wiring

If starter removed from the fluorescent lamp circuit, the tube lamp will......................
A  flicker    D  not glow   C  operate normally   D  being to hum

The resistor connected to the auxiliary, electrode of the mercury vapour.iamp is to
A limit starting current   B improve power factor
C boost up the voltage     D save the energy

The type of conduit junction box is used to connect three directional circuit is...................
A  three way solid junction box B  four way solid junction box
C  two way solid junction box   D  three way solid inspection junction box

The earthing protects the equipment from........
A  leakage current  B   breakdown current  C  lightening strokes  D  surge voltage

The most suitable joint made to extend the length of bare conductor is..................
A  brittania joint   B  scarfed joint   C  married joint   D  western union joint

As per ISI code regulation lighting circuit should not be more than....................
A  600 watts   B  800 watts  C  1000 watts   D  1200 watts

As per ISI code the colour of the earth wire is..............
A red   B black   C green  D gray

The type of switch used in stair case wiring is................
A  one way switch   B   intermediate switch   C  two way switch   D  toggle switch

All the light fitting from the ground level should not be less than...............
A  1.5m   B   2.0 m   C   2.2 m   D   2.5 m

Switch should be installed from the floor level is.....................
A 1.0 m B 1.2 m C 1.3m  D 1.5m

While fixing screws on the batten the distance between screws is.............
A   75 cm B  70 cm C  65 cm D  60 cm

In the horizontal run the distance between the link clips is..................
A 10 cm B 15 cm C 20 cm D   25 cm

TRS cables used on batten wiring is suitable for................
A  high voltage B   extra high voltage  C   low voltage  D   medium voltage

Batten wiring is recommended for..............
A temporary wiring  B permanent wiring  C industrial wiring  D power wiring

The switch and accessory boxes not to be earthed, If they are made of....................
A  metal box  B  sheet metal box  C  PVC box  D  Cast iron box

In a tunnel wiring the type of switch used is..............
A two way switch    B   one way  C intermediate switch  D  push button switch

The minimum thickness of the wall of the PVC box is..................
A  2.5 mm C 2.2 mm   B 2.3 mm D 2.0 mm

The megger used for measuring the insulations resistance in medium voltage wiring, must have the voltage rating of..............
A 3000 V B  1000 V C 2000 V D  500 V

Normal current carrying capacity of 1.5 sq.mm copper cable is..............
A 16A  B 14A  C 15A   D 12A

A 8 SWG conductor has an approximate diameter of....................
A 10mm B 6mm C 8mm D  4 mm

A good earth conductivity gives..............
A a high resistance  B high conductivity  C low resistance  D  low conductivity

For safety point of view, the fuses should be placed in......................
A neutral wire B  earth wire C phase wire D  after the load

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