Target 40/50 correct ITI Electrician/Wireman

1➤ In an AC circuit, the virtual power and real power are measured in respectively. _____and_____

Watt, Reactive voltampereVoltampere, WattWatt, VoltampereReactive Voltampere, Voltampere

2➤ A shape of a drum mounted on the top of the transformer with a oil level indicator is:

ConservatorBuchholz relayExplosion vent Breather

3➤ Which of the following is an example of a secondary type instrument?

Absolute ElectrometerRelay Current scaleTangent GalvanometerWattmeter

4➤ In which of the following ways can the corona effect be reduced?

By escaping from under loadBy using a copper conductorBy keeping proper spacing between conductors and using ACSR conductorBy solid conductor

5➤ The shell type transformer core is made up of:

high grade copper laminationsporcelain sheet impregnated with varnishhigh grade silicon steelasbestos stampings

6➤ State whether the following statements are true or false regarding to the Hysteresis motor, . 1. The Hysteresis torque depends only on th area of the Hysteresis loop of the rotor. 2. Due to the small rotor, the motor operates quietly and is not involved to magnetic pulsation.

True, FalseTrue, TrueFalse, TrueFalse, False

7➤ At the time of starting, the squirrel cage induction motor is connected in star so that the phase voltage is reduced to:

1/√3 times the line voltage 1/3times the line voltage√3 times the line voltage times the line voltage1/√2 times the line voltage

8➤ Which of the following are found in the terminal of SCR?

Cathode, Gate and BaseAnode, Cathode and Gate Gate, Collector and EmitterBase, Drain and Collector

9➤ What is the product formed at the cathode in the electrolysis of molten NaCl?

Oxygen gasHydrogen gas 3Sodium metalChlorine gas

10➤ is a portable instrument used for testing the insulation resistance of a circuit.

MeggerMultimeterTesterTong tester

11➤ Which of the following is not a valid benefit of underground wiring?

Great security for publicLess interference with features Better view of the city Low cost

12➤ Select the colour code for a carbon resistor with a value of 64,000 ± 1% Ohms.

Yellow-green-red-brownGreen-yellow-orange-redRed-brown-blue-yellowBlue-yellow-orange-brown

13➤ Among the following which device cannot be used as a safety device?

Circuit breakerEarth testerFuseELCB

14➤ According to IEE regulation color identification,the Y phase of a three-phase AC circuit is_______

RedYellowBlueGreen

15➤ The process electrostatic is called of achieving uniform stress in the dielectric of cables

Distance of cablesSpace material on cableCable insulation levelGrading of cable

16➤ Which of the following is not a non- conventional source of energy?

Solar energyGeothermal energyOcean Thermal EnergyNuclear energy

17➤ The value of charge (Q) is:

Q = Capacitance(C) x voltage(V)Q=Capacitance(C) / current(A) Q = Capacitance(C) / voltage(V) Q = Capacitance(C) x current(A)

18➤ In a capacitor start induction run motor, a capacitor is used for: Suppressing the sparking

Phase splittingImproving the power factorLeading the current in main winding (running winding)produced across the centrifugal switch

19➤ Which technique is used to find the exact fault location of cables?

Directional relayResistance measurement testLoop test of currentMurray and Varley loop test

20➤ In a steam power plant,______ is a heat exchanger, in which heat is transferred to______ so that its temperature can be increased.

Superheater, wet steamSuperheater, saturated steamEconomizer, wet steam Superheater, feed water

21➤ Which is the insulation material used in an electric iron?

MicaPlasticRubberSilica

22➤ What is the line voltage for a three-phase balanced star connected system with a phase voltage of 240 V?

480.7 V415.7 V120.7 V 250.7 V

23➤ As per IE rules the leakage current in wiring installation should not exceed more than

1/50000th part of full load1/50th part of full load1/500th part of full load 1/5000th part of full load

24➤ In an automatic electric iron, a thermostat is used to:

Switch ON-OFF the indicator lamp.Regulate the heat and thus the temperature by switching the element to ON-OFFReduce the current for controlling the temperature Change the direction of current flow for controlling the temperature

25➤ In the alternating current (AC) circuits, where p(t), v(t) and i(t) are the values of instantaneous power, voltage and current, respectively, the power at any instant is given by

P(t) = V(t)-I(t)P(t) = V(t)/ I(t)P(t) = V(t) + I(t) P(t) = V(t) × I(t)

26➤ In a power transformer, the Iron losses & Copper losses are equal, then transformer efficiency will be:

One Fourth HalfMaximumZero

27➤ A SWG is used to measure:

Cross-sectional area of a wireDiameter of the wireLength of the wire Insulation of wire

28➤ The size of the strip electrode in a cross- section, if made of copper, it should not be smaller than

20 mm x 3 mm10 mm x 3 mm25 × 1.6 mm20 mm x 2 mm

29➤ An induction motor produces 440 V, 6 polar, 50 Hz with a speed of 960 r.p.m. Calculate its percentage slip.

1 Percent3 Percent2 Percent 4 Percent

30➤ If synchronous motor_________then it has a lagging power factor.

Under excited and normally excitedUnexcitedNormally excitedOver excited

31➤ Which of the following is used as the heating unit of an electric kettle?

Open filamentFlat wire sealedConcealed wire in metal tubeInductive filament

32➤ With the given data, calculate the coil gap for a progressive simplex wave coil. 4 coil, 11 slots, 2 sides per slot.

18121614

33➤ Sweep of ceiling fan refers to

Diameter of circle formed by its rotationSpeed of the fanLength of bladeDouble the length of blade

34➤ Choose the type of cable used for domestic appliances from the given options.

Shielded CableRound Flexible CableSubmersible Flat CableArmored Cable

35➤ Which of the following factor does not affect ionic mobility?

Concentration of the solutionTemperaturePressureNature of ions

36➤ Which method of speed control in a DC shunt motor drives it from low to normal speed?

Field voltage control methodApplied flux control methodField-current control methodArmature resistance method

37➤ ESD stands for

Electro Static DischargeElectro Sensitive Device Electro Sensitive DischargeElectrostatic Device

38➤ When the metal body of the instrument is placed in earth contact, what does it protect the equipment from?

Under currentOver currentLeakage currentBreakdown voltage

39➤ Combination plier is used to

Hold and grip the electronic componentsCut wires and cables of small diaHold and grip cylindrical shaped objectsAll the above

40➤ Convert the 127 decimal number into binary.

111111111111111001111111011

41➤ Which type of power-electronic converter is used to control the speed of a DC motor from a fixed DC source?

AC voltage regulatorFully controlled rectifierChopperSemi controlled rectifier

42➤ Which type of insulator is used to prevent the bending of poles?

CapStrainTensilePost

43➤ Four statements are given below. Identify the correct statement.

XOR is a basic gateXOR is derived gateXNOR is a basic gateXOR is universal gate

44➤ The average value of a sine wave of maximum value Vm over one cycle is

Zero2Vm/ π Vm/ 2 Vm/√2

45➤ Electrochemical equivalent may be defined as the __________ of the substance deposited by the the passage of 1 coulomb of electricity.

VelocityWeightVolumeDensity

46➤ Any metal plate, pipe, or other conductors which are electrically connected to the common mass of the earth is called

Earth electrodeEarth continuity conductor Earth terminalEarth wire

47➤ Which of the following parameter cannot be measured by a Tongue tester?

CurrentFrequencyPowerVoltage

48➤ The power which moves in both the directio (forward and reversed) in the circuit is calle as

Active powerApparent powerComplex power Reactive power

49➤ With reference to 3-phase induction motor, state whether the following statements are true or false. 1. The magnitude of the maximum torque does not depend on the rotor resistance. 2. The slip on which the maximum torque OcCurs İs proportional to the rotor resistance.

Right wrong Right RightWrong, RightWrong Wrong

50➤ The capacitance of the capacitor is directly proportional to the:

Material of the plateVoltage of the plateArea of the platePolarity of the plate

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