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WorksheetsELECTRICIAN THEORY
Total questions: 40
Worksheet time: 40mins
What is the back ground colour of warning sings in the basic category?
Blue
White
Yellow
Green
What is the name of the safety sing?
Warning sing
Mandatory sing
Prohibition sing
Information sing
What is the full form of "XLPE" cable?
Cross Line Poly Ethylene
X'ess Line Phase earthing
Cross Linked Poly Ethylene
Excess Length Paper and Ebonite
What dose the number 1.40 represent if a stranded conductor is designated as 10 Sq. mm cable of size 7/1.40?
Area of cross section.
Radius of one conductor.
Diameter of all conductor
Diameter of each conductor
What is the unit for Quantity of electricity?
Mho
Coulomb
Volt / second
Ampere / second
What is the formula is used to find Electro Motive Force (EMF)?
EMF = Potential difference -Voltage drop
EMF = Potential difference + Voltage drop
EMF = Potential difference + Voltage drop / 2
EMF = Potential difference + 2 * Voltage drop
Which type of wire joint is found in the junction box?
Aerial tap joint
Plain tap joint
Rat tail joint
Married joint
What is the purpose of bedding insulation of Under Ground cable?
Protect the cable from mechanical injury.
Protect the cable from moisture and gases.
Protect armouring from atmospheric condition
Protect the metallic sheath against corrosion
Which type of joint is used in over head lines for high tensile.
Scarfed joint
Britannia "T" joint
Western union joint
Britannia straight joint
What is the reading of the micrometer?
5.05 mm
5.00 mm
4.55 mm
4.05 mm
What is the disadvantage of solid conductor compared to stranded conductor?
Less rigidity
Less flexibility
Low melting point
Low mechanical strength
Which conductors are used for distribution lines?
Insulated conductors
Insulated solid conductors
Bare conductors
Two core cable
What is the reading of ohm meter across opened "R2" resistor?
Indicate zero reading
Indicate infinite resistance
Total resistance value of the circuit
Value of sum of the resistance R1 and R3 only.
What is the S.I unit of specific resistance?
Ohm/cm
Ohm/meter Sq.
Ohm-meter
Micro ohm/cm sq.
What is the change of resistance value of the conductor as its diameter is doubled?
Increase two times
Decrease to four times
Decrease to half of the value
No change in value of resistance
What is the effect of parallel circuit with one branch opened?
Current will remain same
Whole circuit will not function
No current will flow in that branch
Voltage drop increase in the opened branch
Which type of meter is used to test the polarity of the battery?
Moving iron ammeter
Moving coil volt meter
Moving iron volt meter
Dynamo meter type wattmeter
Which is the application of series circuit?
Fuse in circuit
Voltmeter connection
Electrical lamp in home
Shunt resistor in ammeter
Which electrical quantity affects the heat generated in a conductor?
Voltage
Square of the current
Square of the resistance
Specific resistance
Which is inversely proportional to the resistance of a conductor?
Length
Resistivity
Temperature
Area of cross-section
What is the S.I unit of Flux density?
Tesla
Weber
Weber/Meter
Ampere-turns
Which is the cause for changing the permeability?
Length
Flux density
Field intensity
Magneto motive force
Which electrical terms is defined as the total opposition to current in AC parallel circuit?
Resistance
Impedance
Admittance
Conductance
What is the phase displacement in three phase AC circuit?
90 Deg
120 Deg
180 Deg
270 Deg
What is the main cause for below 0.5 lagging power factor in three phase system?
Due to fluctuation of voltage
True power due to resistive load
Reactive power due to more inductive load
Reactive power due to more capacitive load
What is the condition for resonance in RLC series circuit?
Xl > Xc
Xl < Xc
Xl = Xc
Xl * Xc
In which 3 phase system , the artificial neutral is required to measure the phase voltage?
3 wire star connected system
4 wire star connected system
4 wire delta connected system
3 wire delta connected system
What is the line voltage in 3 phase system if the phase voltage is 240 V?
380 V
400 V
415 V
440 V
What is the resistance of the inductive coil takes 5 A current across 240V , 50 Hz supply at 0.8 power factor?
48 Ohm
42.5 Ohm
38.4 Ohm
26.6 Ohm
How the low power factor (P.F) can be improved in AC circuit?
By connecting resistor in series
By connecting capacitor in series
By connecting inductors in series
By connecting capacitor in parallel
Which device converts sunlight into electrical energy?
Photo voltaic cell
Liquid crystal diode
Light emitting diode
Light dependent resistor
How the capacity of batteries is specified?
Volt
Watt
Volt ampere
Ampere hour
Which apparatus is used to check the charging condition of voltage in battery?
Voltage
Multimeter
Hydrometer
High rate discharge tester
Why tree system of wiring most suitable for multistoryed building?
Easy load balancing
Constant voltage distribution
Offers minimum voltage drop
Easy in fault finding with many fuses
What is the function of circuit breaker?
Making contact at normal condition
Making contact at abnormal condition
Breaking automatically at abnormal condition
Physical breaking contact at abnormal condition
What is the function of bimetallic strip in MCB ?
Over load protection
Short circuit protection
Over voltage protection
Earth leakage protection
Which wiring suitable for temporary installations?
Concealed wiring
Casing capping wiring
pipe wiring
cleat wiring
What is the maximum permissible load for a power sub circuit as per I.E rules?
800 W
1500 W
2000 W
3000 W
Which instrument is used to test new domestic wiring installation
Multimeter
Megger
Shunt type ohmmeter
series type ohmmeter
Which material is used to make heating element?
Silver
Copper
Nichrome
Aluminium
