Vocational Instructor in Maintenance & repairs of Two wheeler& three wheeler 84/2017 Answer Key 146/2017

Post : Vocational Instructor in Maintenance & repairs of Two wheeler& three wheelers
Department : Kerala Vocational Higher Secondary Education
Category Code : 84/17
Qualification : Diploma in Automobile Engineering
Question Paper Code : 146/17
Date of Test : 11-12-2017

1. The stroke of an engine is the
   • Volume of the cylinder
   • Length of the connecting rod
   • Internal diameter of the cylinder
   • Distance between T.D.C. and B.D.C.
   
   
2. Engine misfiring is likely to result from
   • Spark plug gap too small
   • Spark plug gap too wide
   • Vapours lock in the fuel only
   • Incorrect fuel air mixture
   Question error
   
   
3. The function of a first compression ring (top ring) is that it
   • Increases the combustion temperature
   • Creates swirl
   • Maintains a seal and prevents the fuel leakage
   • Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
   
   
4. Thinner is added to the paint in order to
   • Make pigments and resin mix easily
   • Make paint film hard
   • Optimise its viscosity
   • None of these
   
   
5. The capacity of a battery is usually expressed in terms of
   • Volts
   • Amperes
   • Weight
   • Ampere hours
   
   
6. In a square type engine
   • Geometrical shape is square
   • Diameter and length of piston are same
   • Two cylinders are placed horizontal and two vertical
   • Stroke length and cylinder bore are same
   
   
7. A Traction Control System (TCS) in automobiles controls the
   • Vibrations on the steering wheel
   • Engine power during acceleration
   • Torque that is transmitted by the tyres to the road surface
   • Stopping distance in case of emergency
   
   
8. The characteristic that is enhanced by the honing of cylinder sleeves inner surface is
   • Cooling efficiency
   • Resistance to wear
   • Lubrication performance
   • None of these
   
   
9. If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called
   • Detonation
   • Ignition
   • Pre-ignition
   • Rumble
   
   
10. The vehicle ride will be comfortable if
    • Unsprung mass is kept minimum
    • Vehicle mass is kept minimum
    • Sprang mass is kept minimum
    • All of these
    
    
11. The condition that results in large quantities of HC emission is
    • High temperature combustion
    • Incomplete combustion
    • Low temperature combustion
    • High atmospheric temperature combustion
    
    
12. The engine oil viscosity is defined by ________ ratings.
    • Automatic Transmission Fluid (ATF)
    • Society of Automotive Engineers (SAE)
    • Gross Vehicle Weight (GVW)
    • American Petroleum Institute (API)
    
    
13. The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as
    • Indicator diagram
    • Axial force diagram
    • Valve timing diagram
    • None of these
    
    
14. The octane rating of petrol commercially available is
    • 85-95
    • 95-100
    • 100-110
    • 110-125
    
    
15. The instrument used to check specific gravity of acid in a battery is
    • Hydrometer
    • Hygrometer
    • Anemometer
    • Multimeter
    
    
16. The auto ignition in a spark ignition engine means
    • Automatic ignition of the charge at the end of compression
    • Ignition induced by the passage of a spark
    • Ignition of the charge before the passage of flame front
    • Ignition induced to supplement the process of normal combustion
    Question error
    
    
17. Highest Useful Compression Ratio (HUCR) is the highest compression ratio at which the
    • Engine can run
    • Engine gives maximum output
    • Engine is most efficient
    • Fuel can be used in a test engine without knocking
    Question error
    
    
18. The cetane rating of Diesel fuel is in the order of
    • 25
    • 45
    • 70
    • 90
    
    
19. A four cylinder engine has a capacity of 2.4 litres. The swept volume of one cylinder is
    • 400 cm³
    • 600 cm³
    • 1200 cm³
    • 2400 cm³
    
    
20. In comparison with a radial tyre, one advantage of a bias ply tyre is
    • Longer life
    • Lower rolling resistance
    • Smoother ride at low speeds
    • None of these
    
    
21. The cetane number of a Diesel fuel is a measure of
    • Volatility
    • Viscosity
    • Ignition quality
    • Delay period
    
    
22. The negative plates of a lead acid battery has
    • Lead peroxide (PbO₂)
    • Spongy lead (Pb)
    • Lead sulphate (PbSO₄)
    • Sulphuric acid (H₂SO₄)
    Question error
    
    
23. The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called
    • Camber
    • Caster
    • Toe in
    • Toe out
    
    
24. If the valve clearances are excessively large, the problem that can arise is
    • Overheating of the engine
    • Incomplete valve closure
    • Fouling of spark plug by gasoline
    • None of these
    
    
25. For the same maximum pressure and temperature
    • Diesel cycle is more efficient than Otto cycle
    • Otto cycle is more efficient than Diesel cycle
    • Both Otto cycle and Diesel cycle are equally efficient
    • None of these
    
    
26. Problems caused by the wheel imbalance are
    • Hard steering and hard ride
    • Poor acceleration and hard steering
    • Steering wheel vibrations and uneven tyre wear
    • Poor acceleration and reduced fuel efficiency
    
    
27. The torque converter uses ____________ to transfer torque.
    • Air
    • Automatic Transmission Fluid (ATF)
    • Gears
    • Steel belt
    
    
28. The composition of the electrolyte in a fully charged battery is that
    • The electrolyte is pure distilled water
    • The electrolyte is pure sulphuric acid
    • The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
    • The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
    
    
29. The air gap between the central electrode and ground (or side) electrode of a spark plug is around
    • 0.2 mm
    • 0.5 mm
    • 1 mm
    • 1.5 mm
    
    
30. The specific gravity of acid in a fully charged battery is generally
    • 1.00
    • 1.28
    • 1.82
    • 2.81
    
    
31. In radial tyres
    • One ply layer runs diagonally one way and another layer runs diagonally the other way
    • All plies run parallel to one another and vertical to tyre bead
    • Inner tubes are always used
    • None of these
    
    
32. The power source for a brake booster is
    • Exhaust manifold pressure
    • Electricity
    • The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
    • Hydraulic pump
    
    
33. The most commonly used Supplementary Restraint System (SRS) component is
    • Seat belt
    • Brake
    • Airbag
    • Steering
    
    
34. It is necessary to maintain the valve clearance as they
    • Reduce the resistance to sliding that occurs between the cam and the tappet
    • Allow for lengthening of the valves owing to the heat of combustion
    • Increase the speed at which the valves move up and down
    • Make the crankshaft turn smoothly
    
    
35. Wheel base of a vehicle is the
    • Distance between the centres of the front and rear wheels
    • Distance between the centres of the front tyres
    • Distance between the centres of the rear tyres
    • Extreme length of the vehicle
    
    
36. The torque available at the contact between driving wheels and road is known as
    • Brake effort
    • Tractive effort
    • Clutch effort
    • None of these
    
    
37. During braking, the brake shoe is moved outward to force the lining against the
    • Wheel piston or cylinder
    • Anchor pin
    • Brake drum
    • Wheel rim or axle
    
    
38. The main function of an exhaust muffler is the
    • Optimization of exhaust efficiency
    • Reduction of exhaust noise
    • Reduction of nitrogen oxide in the exhaust gases
    • Reduction of the exhaust
    
    
39. In Diesel engines, the duration between the time of injection and the time of ignition is called
    • Spill cut-off
    • Delay period
    • Injection period
    • Ignition period
    
    
40. An engine has a clearance volume of 100 cm3 and a swept volume of 800 cm³ . The compression ratio is
    • 7 : 1
    • 8 : 1
    • 9 : 1
    • 10 : 1
    
    
41. The component in the radiator of an automobile that increases the boiling point of water is
    • Drain plug
    • Water jacket
    • Vacuum valve
    • Pressure cap
    
    
42. Which part of the automobile tyre is subjected to greatest flexing action?
    • Bead
    • Side wall
    • Shoulder
    • Tread
    
    
43. The function of a governor in automobiles is to
    • Limit the power
    • Limit the vehicle speed
    • Maintain constant engine speed
    • Maximise the fuel economy
    
    
44. If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on
    • Too lean mixture
    • Stoichiometric mixture
    • Most economical mixture
    • Too rich mixture
    
    
45. The crescent shaped cavity on the piston head top surface is called as
    • Piston oil hole
    • Snap ring
    • Valve recess
    • Valve clearance
    
    
46. The characteristic that is enhanced by the use of cylinder sleeves is
    • Cooling efficiency
    • Resistance to wear
    • Lubrication performance
    • None of these
    
    
47. The antiknock property of compression ignition engine fuel can be improved by adding
    • Tetraethyl lead
    • Trimethyl pentane
    • Amyl nitrate
    • Hexadecane
    
    
48. The major purpose of an electronically controlled automatic transmission is that this type of transmission
    • Eliminates gear clutches
    • Eliminate the gear shaft lever
    • Reduces the number of automatic transmission components
    • Reduces shift shock and achieves more efficient transmission of engine torque
    
    
49. In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as
    • Release chamber
    • Balancer
    • Relief valve
    • Stop valve
    
    
50. The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of
    • Section width to section height
    • Section height to section width
    • Wheel diameter to section height
    • Wheel diameter to section width
    
    
51. The advantage of the fuel injection system over the carburettor system is
    • Improved fuel efficiency
    • Improved emission
    • Improved power output
    • All of these
    
    
52. Which of the following indicates multi-grade oil?
    • SAE30
    • API SF
    • SAE20 W50
    • API50
    
    
53. The compression ratio in petrol engine is kept less than in Diesel engine because
    • It makes petrol engines lighter
    • Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
    • Less compression ratio gives better performance
    • It is just customary to have less compression ratio in petrol engines
    
    
54. The service brakes employed in cars are generally operated
    • Mechanically
    • Hydraulically
    • Pneumatically
    • None of these
    
    
55. The self ignition temperature of Diesel as compared to petrol is
    • Higher
    • Lower
    • Same
    • Depends on fuel quality
    
    
56. The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as
    • Supercharging
    • Auto ignition
    • Scavenging
    • Detonation
    
    
57. The caster is called positive when the top of the king pin is inclined to the
    • Rear of the vehicle
    • Front of the vehicle
    • Left of the vehicle
    • Right of the vehicle
    
    
58. Why are pistons given a coating?
    • To increase lubrication effect
    • To conduct heat efficiently
    • To reduce weight
    • To reduce possibility of scoring
    
    
59. The function of Positive Crankcase Ventilation (PCV) system is that it
    • Mixes fuel with air
    • Promotes combustion by creating a swirling movement in the air-fuel mixture
    • Returns blow by gases from the crankcase to the intake system
    • Feeds blow by gases to the exhaust manifold
    
    
60. The basic purpose of a Four Wheel Drive (4WD) system is that it
    • Delivers improved cornering on dry road surfaces
    • Eliminates the need of snow tyres, tyre chains, etc.
    • Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
    • Ensures that effective braking can be performed, even on slippery surfaces
    
    
61. The timing belt is attached to the camshaft pulley and
    • Timing belt drive pulley
    • Distributor
    • Radiator fan pulley
    • Alternator pulley
    
    
62. When the front wheels of a vehicle are locked during braking, then
    • Stopping distance becomes extremely long
    • Front tyres skid across the road surface and the vehicle spins around
    • Rear tyres skid across the road surface and the vehicle spins around
    • Driver loses control over the steering and the vehicle continues moving in its current direction
    
    
63. The best fuels for compression ignition engines are
    • Straight chain paraffin
    • Aromatics
    • Branched chain paraffin
    • Naphthalene
    
    
64. Damper is also known as
    • Shock absorber
    • Torsion bar
    • Spring
    • Radius rod
    
    
65. The effect of having excess camber is
    • Excessive steering alignment torque
    • Hard steering
    • Too much traction
    • Uneven tyre wear
    
    
66. If a tyre is designated as 175/65 R-14 82-S, then the aspect ratio for the tyre is
    • 175
    • 65
    • 14
    • 82
    
    
67. In a hydraulic power steering system, the power steering pump is driven by a
    • Belt driven by camshaft
    • Chain driven by crankshaft
    • Belt driven by drive-shaft
    • Belt driven by crankshaft
    
    
68. The included angle is the sum of the
    • Camber and castor
    • Castor and S.A.I.
    • Camber and S.A.I.
    • Camber and toe in
    
    
69. Vulcanizing means
    • Heating rubber under pressure
    • Spraying with special paint
    • Melting rubber while stirring it
    • None of these
    
    
70. When turning a corner
    • The front wheels are toeing out
    • The front wheels are turning on different angles
    • The inside front wheels has a greater angle than the outside wheel
    • All of these
    
    
71. When a gear box has four forward speeds and one reverse speed, it is said to be a
    • 3-speed gear box
    • 4-speed gear box
    • 5-speed gear box
    • 6-speed gear box
    
    
72. The basic purpose of providing caster angle on wheels is to
    • Prevent uneven tyre wear
    • Maintain directional control
    • Bring the road contact of the tyre under the point of load
    • Compensate for wear in the steering linkage
    
    
73. When the piston is at T.D.C. the volume above the piston in the combustion chamber is the
    • Clearance volume
    • Cylinder volume
    • Exhaust volume
    • None of these
    
    
74. Incorrect Steering Axis Inclination (S.A.I.) causes
    • Tendency to assume toe-out orientation
    • Generation of a braking effect at tight corners
    • Poor recovery of the steering wheel after making a turn
    • The vehicle to pull to the side of lesser inclination
    
    
75. The correct way to rectify an imbalanced wheel is to
    • Adjust the tyre pressure
    • Rotate the tyres
    • Adjust the damper spring tension
    • Attach appropriate weights to the wheel at appropriate positions
    
    
76. The fuel that detonates easily, is
    • N-heptane
    • Iso-octane
    • Benzene
    • Alcohol
    
    
77. The parking brake generally acts on
    • Front wheels
    • Rear wheels
    • Front and rear wheels
    • Propeller shaft
    
    
78. The commonly used antifreeze solution in automobiles is
    • Carbon disulphide
    • Ethylene glycol
    • Ammonium chloride
    • Freon-12
    
    
79. Which of the following oil is more viscous?
    • SAE 30
    • SAE 40
    • SAE 70
    • SAE 80
    
    
80. The painting of automobiles is done to
    • Prevent rust from growing on the body
    • Improve its external appearance
    • Retain the characteristics of steel for long
    • All of these
    
    
81. Which is the headquarter of Theosophical society in India?
    • Goa
    • Adayar
    • Calcutta
    • Calicut
    
    
82. Founder of “Bashaposhini Sabha”
    • Sankaran
    • Krishnan
    • Kandathil Varghese Mappilai
    • Joseph Ramban
    
    
83. Name the magazine started by Basel Mission to familiarize Malayalee with the history and geography of Europe.
    • Paschimodayam
    • Prabhatham
    • Western society
    • Udayam
    
    
84. Which Article makes the Supreme Court the defender and guaranteer of the Fundamental Rights?
    • Article 32
    • Article 51
    • Article 50
    • Article 51A
    
    
85. Which is the 24 Working – Gender Help Desk of Kudumbasree?
    • Women guild
    • Girl Friendly
    • Karuthu
    • Snehitha
    
    
86. Transplantation of Human Organs Act passed in India
    • 2000
    • 2004
    • 2013
    • 1994
    
    
87. In which Part of the Constitution explains the process of “Elections”?
    • Part XVII
    • Part XXI
    • Part XV
    • Part IX B
    
    
88. Name the social reformer whose son was Nataraja Guru
    • Ayyankali
    • Sree Narayana Guru
    • Chattampi Swamikal
    • Dr. Palpu
    
    
89. The year in which “Kuttamkulam Satyagraha” took place
    • 1950
    • 1951
    • 1946
    • 1952
    
    
90. Founder of ‘Arya Samajam’
    • Palpu
    • Pandit Karuppan
    • K. M. Panikkar
    • Sankaracharya
    Question error
    
    
91. Who is the author of “Onnekalkodi Malayalikal”?
    • E.M.S.
    • K. Kelappan
    • Vaghbhatananda
    • Vaikunda Swamikal
    
    
92. Leader of ‘Pattini Jatha’ from Kannur to Madras
    • Ali Musaliyar
    • A. K. Gopalan
    • Moidu Maulavi
    • P. Krishna Pillai
    
    
93. Who is the President of Congress Session held at Amaravathi in 1897?
    • E. Ikanda Warrier
    • Subhash Chandra Bose
    • Nehru
    • C. Sankaran Nair
    
    
94. Name the person who died as a martyr in Paliyam Satyagraha
    • Abraham Malpan
    • T. K. Madhavan
    • A. G. Velayudhan
    • C. Kesavan
    
    
95. Name the Diwan who gave permission to Channar Women to wear jackets
    • Lord Rippon
    • Col. Macaulay
    • Col. Munro
    • Lord Curzon
    
    
96. In which year Sree Narayana Guru install Siva idol at Aruvippuram?
    • 1888
    • 1886
    • 1896
    • 1885
    
    
97. In which year Nair Service Society was founded?
    • 1913
    • 1910
    • 1911
    • 1914
    
    
98. In which year the Govt. of India launched Kudumbasree?
    • 2001
    • 1998
    • 1995
    • 2005
    
    
99. Which Article gave special status to Delhi?
    • Article 20
    • Article 239AA
    • Article 10
    • Article 250
    
    
100. Who led “Achipudava Samaram”?
     • A. Velayudha Panikkar
     • Chattambi Swami
     • K. Kelappan
     • Sahodaran Ayyappan