Questions and Answers Section 9

Questions and Answers

Question :

81.The brake warning light warns the driver of

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failure of the primary or secondary circuit of hydraulic system

Question :

82.In Diesel engines, during suction stroke, only air is drawn in the 

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cylinder

Question :

83.The formula for Iso-octane is

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C8H18

Note:-

2,2,4-Trimethylpentane, also known as isooctane or iso-octane, is an organic compound with the formula (CH₃)₃CCH₂CH(CH₃)₂. It is one of several isomers of octane. This particular isomer is the standard 100 point on the octane rating scale. Wikipedia
Formula: C8H18
Boiling point: 99 °C
Specific heat capacity (C): 242.49 J K−1 mol−1
UN number: 1262
Molar mass: 114.23 g·mol−1
Refractive index (nD): 1.391

Question :

84.The function of a governor in automobiles is to

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limit the vehicle speed 

Note:-Small engines, used to power lawn mowers, portable generators, and lawn and garden tractors, are equipped with a governor to limit fuel to the engine to a maximum safe speed when unloaded and to maintain a relatively constant speeddespite changes in loading.

Question :

85.A petrol that detonates easily is called

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low octane petrol

Note:-An octane rating, or octane number, is a standard measure of the performance of an engine or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating (igniting).Use of gasoline with lower octane numbers may lead to the problem of engine knocking. 




Question :

86.The minimum parking brake force is generally 20% of 

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gross vehicle mass (GVM)

Note:-The gross vehicle weight rating (GVWR), or gross vehicle mass (GVM) is the maximum operating weight/mass of a vehicle as specified by the manufacturer including the vehicle's chassis, body, engine, engine fluids, fuel, accessories, driver, passengers and cargo but excluding that of any trailers.

Question :

87.Bead wires are made of

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steel

NOte:-bead wire is a hard drawn, high carbon steel wire available in a range of wire diameters , tensile strengths and shapes.

Question :

88.The Diesel engines are also known as

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compression ignition (C.I.) engines 

Question :

89.The specific gravity of acid in a fully charged battery is generally 

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1.28

Question :

90.The information provided by the oxygen (O2) sensor to the feedback control system is about the

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air-fuel ratio

Note:-Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process.In an internal combustion engine or industrial furnace, the air-fuel ratio is an important measure for anti-pollution and performance-tuning reasons.