ITI Wireman Questions and Answers for Preparation

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ITI Wireman Questions and Answers

Go through the below sections to get wireman practice test in addition to the Previous Year Question Papers. The Electrical Wireman practice test Syllabus is given here. The electrical wireman exam questions may help you for the better preparation.

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ITI Wireman MCQ Objective Questions and Answers

1. The shape and colour of mandatory sign is :
(A) circular shape – black symbol on yellow background
(B) circular shape – white symbol on blue background
(C) square shape – green symbol on white background
(D) triangular shape – black symbol on blue background

2. Open circuit test should be conducted before the ________ to make sure that the complete circuit included in the test.
(A) insulation test
(B) ground test
(C) s.c. test
(D) o.c. test

3. Which tool is not used for making pilot holes on wooden/metal article?
(A) Cantor punch
(B) Bradawl
(C) Packer
(D) Rawal plug tool

4. What effect of electric current is used in electric motors?
(A) chemical effect
(B) magnetic effect
(C) heating effect
(D) shock effect

5. The method of fire extinguishing by isolating the fire from the supply of oxygen by blanketing it is known as :
(A) Smothering
(B) Starving
(C) Accumulation
(D) cooling

6. What does S.W.G. stands for?
(A) Standard Western Gauge
(B) Swiss Wire Gauge
(C) Swiss Western Gauge
(D) Standard Wire Gauge

7. Combination pliers are not used for:
(A) Cutting
(B) Twisting
(C) hammering
(D) holding

8. Armouring is provided in the cables to safeguard against :
(A) moisture entry
(B) white ant
(C) bursting of failure
(D) mechanical injury

9. The floats used in the Buchholz relay is operated by :
(A) mercury switches
(B) iron clad switches
(C) centrifugal switches
(D) flush mounting switches

10. A source of e.m.f. is required in order to :
(A) prevent the escape of electrons
(B) insulate the electrons from the unbalanced atoms
(C) get the electrons into motion
(D) change the property of conductance into resistance

11. Three resistors are connected in series across a 27 V supply. The second resistor has twice the resistance of the first, the third resistor has three times the resistance of the second. The voltage across the third resistor is :
(A) 18 V
(B) 6 V
(C) 9 V
(D) 3 V

12. According to Fleming’s L.H.R. the angle between the thumb, middle finger and forefinger must be :
(A) 180° between any two
(B) right angle between any two
(C) all must be 45° apart
(D) mutually at right angle each other

13. The standard supply frequency in India is :
(A) 60 c/s
(B) 50 c/s
(C) 55 Hz
(D) 45 c/s (B)

14. Luminous efficiency of a Fluorescent Tube is :
(A) 30 lumen/watt
(B) 60 lumen/watt
(C) 40 lumen/watt
(D) 80 lumen/watt

15. If two capacitors having capacitance C, and C, are connected in series, then the total capacitance [CT] of the circuit is :
(A) CT= C1+C2
(B) CT=C1C2/[C1+c2]
(C) CT=1/C1+1/C2
(D) CT=[C1+C2]/C1C2

16. What is the unit of Magneto Motive Force?
(A) Volt
(B) Ampere
(C) Ampere-turns
(D) Weber

17. Whenever the magnetic flux linking with a conductor changes, an e.m.f. is induced in that conductor. The above statement is due to :
(A) Weber and -Ewing’s law
(B) Faraday’s law of electrolysis
(C) Coulomb’s law
(D) Faraday’s law of electromagnetic induction

18. Which of the following is not a diamagnetic material?
(A) Air
(B) Water
(C) Glass
(D) Sulpur

19. Which series MCBs are designed to protect circuits with inductive loads?
(A) L series MCB
(B) G series MCB
(C) AC series MCB
(D) DC series MCB

20. Out of the four metal/alloys given below, one has almost no change in resistance for change in temperature :
(A) Nickel
(B) Nichrome
(C) Monganin
(D) Platinum

Questions for ITI Jobs

Refrigeration and Air Conditioner Carpenter
Automobile Engineering Lineman
Printing Technology Wireman
Tool and Die Maker Electrician
Boiler Operator Electrical
Pump Operator Mechanic
Architectural Draftsman Surveyor
Draughtsman Civil Instrument Mechanic
Masonry Electronics Mechanic
Welder Information Technology
Fitter Computer Hardware
Turner Steel Fabricator
Plumber Electroplater

21. As per the recommendation of BIS and NEG, the minimum clearance between the ceiling and the plane of the blades of the ceiling fan shall not be less than :
(A) 300 mm
(B) 1300 mm
(C) 2400 mm
(D) 200 mm

22. To control one lamp from three places we use :
(A) 3 one Way switches
(B) 2 two way switches and 1 one way switch
(C) 3 two way switches
(D) 2 two way switches and 1 intermediate switch

23. In simple voltaic cell, zinc plate is amalgamating with mercury to prevent :
(A) Local action
(B) Polarization
(C) Buckling
(D) Sulphation

24. In a parallel plate capacitor, if a dielectric slab is introduced, the p. d. between plates will :
(A) remains the same
(B) decrease
(C) increase
(D) becomes zero

25. Number of light points admissible in one circuit are :
(A) 4 points of 400 w each
(B) 8 points of 200 w each
(C) 12 points of 60 w each
(D) 8 points of 100 w each

26. Bayonet Cap lamp holders cannot be used for lamps having wattage rating more than :
(A) 60 w
(B) 100 w
(C) 200 w
(D) 1000 w

27. Other than Nichrome, which of the following materials are used as heating element?
(A) Tungsten
(B) Kanthal
(C) Porcelain
(D) Mica

28. One Calory is equal to :
(A) 4187 joules
(B) 41 .87 joules
(C) 418.7 joules
(D) 4.187 joules

29. A 1 KW, 230 V kettle is connected to 15 A plug socket using a power cord rated to carry 15 amperes. What should be the fuse rating of this appliance circuit?
(A) 6 amps
(B) 4 amps
(C) 10 amps
(D) 15 amps

30. A heater with short-circuited heating element is tested with a series best lamp, the test lamp will :
(A) glow brightly
(B) glow dim
(C) glow normally
(D) not glow

31. The unit of luminous intensity is :
(A) Candela
(B) Steradian
(C) Lux
(D) Lumen

32. The purpose of a resistor connected in series with the heating element of an automatic electric iron is to:
(A) control the current through the heating element
(B) apply low voltage to pilot lamp
(C) give safety for the thermostat
(D) control the heat

33. In batten wiring, the distance between link clips in vertical runs shall not exceed :
(A) 6 cm
(B) 10 cm
(C) 12 cm
(D) 15 cm

34. The process by which an emf induced in a DC generator is known as __________ method.
(A) Static
(B) Dynamic
(C) mutual induction
(D) self induction

35. Testing s wiring installation for insulation resistance is to ensure that
(A) all conductors have high ohmic value in the circuit
(B) all outlet points are earthed properly to ground
(C) leakage current beyond the stipulated value does not flow to earth
(D) Live and neutral conductors in the installation are continuous

36. In this wiring, to operate 3 lamps in all we require 6 two way switches :
(A) corridor wiring
(B) godown wiring
(C) tunnel wiring
(D) hostel wiring

37. Fleming’s Right hand rule is used to identify the :
(A) direction of current in a motor
(B) direction of rotation in a generator
(C) direction of rotation in a motor
(D) direction of induced emf

38. To get sinusoidal wave shape of an alternating current :
(A) coil should rotate under uniform field
(B) coil should rotate under more number of poles
(C) two slip rings must be used
(D) armature should have more number of coils

39. In a DC machine, the conductors of the armature windings are soldered to commutator at the :
(A) segment internally
(B) riser
(C) segments directly
(D) brushes

40. The inter poles are connected in a dc generator :
(A) in series with armature and of same polarity ahead of approaching pole
(B) in series with armature and of opposite polarity ahead of approaching pole
(C) in parallel with armature and of same polarity ahead of approaching pole
(D) in parallel with armature and of opposite polarity ahead of approaching pole

41. If different quantities of water are heated for the same time by the same capacity heaters, then the temperature developed at the :
(A) larger quantity of water will have a higher temperature than the smaller quantity of water
(B) smaller quantity of water will have a higher temperature than the larger quantity of water
(C) larger quantity of water will have the same temperature than the smaller quantity of water
(D) none of the above

42. The meter used to measure the temperature of furnace is :
(A) thermometer
(B) thermostat
(C) hygrometer
(D) pyrometer

43. Resistors of 5 ohms, 5 kilo ohms, 50 kilo ohms, 5 mega ohms are connected in parallel. Their equivalent resistance will be very near to :
(A) 4.5 ohms
(B) 4.5 kilo ohms
(C) 45 kilo ohms
(D) 4.5 mega ohms

44. A substance that has low retentivity can be used for the manufacture of :
(A) Electromagnets
(B) permanent magnets
(C) bar magnets
(D) paramagnets

45. When the fluorescent lamp is switched ON there is some vibrating sound from the choke.
This is due to loose :
(A) connection in the choke
(B) winding turns
(C) core
(D) screws in the cover

46. How big is the peak amplitude of a sine-wave with an effective value of 220 volts?
(A) 440 V
(B) 400 V
(C) 380 V
(D) 311 V

47. In a capacitive AC circuit the:
(A) current lags voltage
(B) voltage leads current
(C) voltage lags current
(D) voltage is in phase with current

48. In a RL parallel circuit, the opposition to total current is called:
(A) Reactance
(B) Impedance
(C) Resistance
(D) a vector sum

49. A 4 pole simplex lap-wound armature having 48 slots, each slot has 4 conductors and each conductor is having resistance of 0.1 ohms. What will be the total armature resistance?
(A) 0.48 ohm
(B) 1.2 ohms
(C) 1.92 ohms
(D) 4.8 ohms

50. Speed of DC shunt motor has to be controlled through the field. Which starter is most suitable in this case?
(A) 4 point starter
(B) 3 point starter
(C) 2 point starter
(D) DOL starter

51. A very low value of insulation resistance indicates :
(A) good operating condition
(B) fair operating condition
(C) an immediate investigation
(D) that the measuring instrument is wrong

52. The magnetic field produced in the stator of a 3 phase induction motor travels at :
(A) rotating speed
(B) asynchronous speed
(C) synchronous speed
(D) slip speed

53. The motor which requires least maintenance is :
(A) squirrel cage induction motor
(B) slip ring induction motor
(C) dc series motor
(D) dc shunt motor

54. When testing the shunt winding of a DC machine for continuity with test lamp of high wattage, the prods when touched on shunt field terminals give spark. What is the reason?
(A) Shunt field winding is grounded
(B) Shunt field winding is open circuited
(C) Shunt field winding has low resistance
(D) Shunt field winding has high resistance

55. The main function of NVC generally used with a motor starter is to :
(A) open the main contacts of the starter on failure or reduction of input voltage and automatically reclose it on return of normal voltage
(B) open the main contacts of the starter on failure or reduction of input voltage and keep it open until manually closed
(C) control motor voltage and keep it at the rated value
(D) prevent the main contact of the starter from opening when fluctuations occur in the power system

56. “Eyre No.7″ is :
(A) Copper soldering flux
(B) Aluminium solder
(C) Copper solder
(D) Aluminium soldering flux

57. In a DOL starter, a NVC is connected across a phase and neutral of a three phase 415 V, 50 Hz supply and works normally. Then the rating of the NVC ought to be:
(A) 415 V, 60 Hz AC
(B) 400 V, 50 Hz AC
(C) 240 V, 50 Hz AC
(D) 200 V, 50 Hz AC

58. The starting current of a 220V, 10 HP shunt motor having armature resistance of 0.2 ohm without starter is :
(A) 11 A
(B) 1100 A
(C) 110 A
(D) 11000 A

59. In a dc generator, if the field circuit resistance is more than field critical resistance, then the
(A) field coils will burn
(B) generator will build up max. voltage
(C) generator will generate up max. power
(D) generator will not build up voltage

60. Metric Horse Power is equal to :
(A) 746 W
(B) 736 W
(C) 756 W
(D) 1000 W

61. When remote ON and OFF are used, the remote ON button should be connected with the existing ON button :
(A) in series
(B) in parallel
(C) in series and parallel
(D) bridge circuit formation.

62. While running, the rotor frequency in a 3 phase induction motor is equal to :
(A) stator frequency
(B) stator frequency / slip
(C) stator frequency / slip
(D) stator frequency + slip

63. When a single phase supply is connected across single phase winding of motor, the nature of magnetic field produced is :
(A) constant in magnitude and direction
(B) alternating in nature
(C) constant in magnitude but rotating at synchronous speed
(D) pulsating in nature

64. When remote push buttons are used START push buttons are wired in _______ and STOP push buttons are wired in _________in a starter control circuit.
(A) series, series
(B) series, parallel
(C) parallel, series
(D) Parallel, parallel

65. In a manual star-delta starter, the stop button connection is in series with the :
(A) no volt coil
(B) no volt coil and overload relay contacts
(C) overload relay contacts
(D) no volt coil and start button

66. After repeated melting of solder, to compensate the loss it is necessary to add ____________ to the solder.
(A) Zinc
(B) Lend
(C) Flux
(D) Tin

67. While measuring unknown voltage with a multimeter, it is recommended to select the ________ range available.
(A) most lowest
(B) lowest
(C) middle
(D) highest

68. The shunt type ohmmeter will have zero reading at the :
(A) centre of the scale
(B) right hand end of the scale
(C) left hand end of the scale
(D) anywhere according to manufacturer

69. A panel type voltmeter with a pen moving on a graph comes under the category of :
(A) absolute instrument – indicating type
(B) secondary instrument – indicating type
(C) secondary instrument – integrating type
(D) secondary instrument – recording type

70. PMMC ammeter have uniform scale because :
(A) of eddy current damping
(B) they are spring-controlled
(C) the deflecting torque varies directly as the current
(D) both (A) and (C)

71. The control force employed in an indicating instrument which can be kept in any position is :
(A) gravity control
(B) spring control
(C) fluid friction control
(D) hydraulic friction control

72. Most of the accidents happen while chipping due to :
(A) loose hammer handles
(B) mushroom head chisel
(C) failure to use chip guard
(D) any one of the above

73. A tong-tester in an instrument having a:
(A) current transformer
(B) potential transformer
(C) current transformer with an ammeter
(D) potential transformer with a voltmeter

74. A coolant is used for cooling the :
(A) Machine
(B) job only
(C) cutting tool
(D) hot chips

75. As compared to an amplifier, a transformer cannot :
(A) increase the output power
(B) increase the output voltage
(C) increase the output current
(D) perform none of these

76. Crackle test on transformer oil is conducted to find out the presence of :
(A) Air
(B) Water
(C) Gas
(D) oxide

77. Diversity factor is the ratio between minimum actual load and :
(A) combined load
(B) expected load
(C) maximum load
(D) none of the above

78. A thermistor is a device whose resistance :
(A) reduces as temperature increases
(B) increases as temperature increases
(C) reduces as temperature reduces
(D) remains constant at all temperatures