Questions and Answers Section 5

Questions and Answers

Question :

41.The engine torque increases with the increase in engine speed up to a certain point 

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after which it starts to fall down.  

Question :

42.The instrument used to check specific gravity of acid in a battery is  

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hydrometer

Note:-an instrument for measuring the density of liquids also.A hydrometer is usually made of glass, and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright.

Question :

43.The material generally used for cylinder sleeves is

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cast iron

Note:-Cast iron is a group of iron-carbon alloys with a carbon content greater than 2%. (typically 2–4.3 per cent).

Question :

44.The acid used in automobile battery is

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sulphuric acid

Note:-Sulfuric acid is a mineral acid with molecular formula H₂SO₄. It is a colorless odorless syrupy liquid that is soluble in water, in a reaction that is highly exothermic. Its corrosiveness can be mainly ascribed to its strong acidic nature.
Molar mass: 98.079 g/mol
Density: 1.84 g/cm³
Boiling point: 337 °C
Melting point: 10 °C 

Question :

45.The Diesel engine works on

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Diesel cycle 

Note:-Diesel cycle  (constant pressure cycle)

Question :

46.When a gear box has four forward speeds and one reverse speed, it is said to be a

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4-speed gear box

Question :

47.The basic purpose of providing caster angle on wheels is to 

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Maintain directional control

Note:-The caster angle or castor angle is the angular displacement of the steering axis from the vertical axis of a steered wheel in a car, motorcycle, bicycle or other vehicle, measured in the longitudinal direction.

Question :

48.When the piston is at T.D.C, the volume above the piston in the combustion chamber is the 

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clearance volume.

Note:-it compress the fuel air mixture in the clearance volume before ignition takes place.

Question :

49.In a hydraulic power steering system, the power steering pump is driven by a

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belt-driven by crankshaft.

Question :

50.The fuel that detonates easily, is 

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n-heptane

Note:-n-Heptane is the straight-chain alkane with the chemical formula H₃C(CH₂)₅CH₃ or C₇H₁₆. When used as a test fuel component in anti-knock test engines, a 100% heptane fuel is the zero point of the octane rating scale. 
Formula: C7H16
Boiling point: 98.42 °C
Density: 684 kg/m³
Molar mass: 100.21 g/mol