Questions and Answers Section 15

Questions and Answers

Question :

41.The purpose of a thermostat in an engine cooling system is to

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allow the engine to warm up quickly

Question :

42.The petrol engine works on 

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Otto cycle

Question :

43.The reconditioning process used to give cylinder bore surfaces a crosshatch pattern, is known as

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honing 

Question :

44.The ease with which petrol vaporizes is called its

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volatility

Note:-volatility means tendency of a substance to evaporate at normal temperatures.

Question :

45.The included angle is the sum of the

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camber and S.A.I. 

Question :

46.The lubrication oil flow in an engine is in the order as 

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oil strainer- oil pump - relief valve - oil filter - cylinder block cylinder head - oil pan

Question :

47.A three way catalytic converter 

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removes CO, HC, and NO2 from the exhaust gasses passing through it

Question :

48.The valve overlap in four stroke petrol engines is approximately 

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30°

Question :

49.The petrol engines are also known as

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spark ignition (S.I.) engines

Question :

50.Which of the following indicates a multigrade oil ?

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SAE 20 W-50 

Note:-Oils can be separated into multigrade oils and monograde oils. Multigrade oils must fulfill two viscosity specifications, their viscosity grade consists of two numbers, e.g. 10W-40: 10W refers to the low-temperature viscosity ("Winter"), 40 refersto the high-temperature viscosity ("Summer").