Questions and Answers Section 14

Questions and Answers

Question :

31.The temperature indicating instrument in vehicles indicates the temperature of

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jacket cooling water 

Note:-A water jacket is a water-filled casing surrounding a device, typically a metal sheath having intake and outlet vents to allow water to be pumped through and circulated. The flow of water to an external heating or cooling device allows precise temperature control of the device.

Question :

32.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

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supercharging

Question :

33.In aluminum cylinder blocks, the cylinder liners are made of

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cast iron

Question :

34.The device for smoothening out the power impulses from the engine is called

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flywheel

Note:-a heavy revolving wheel in a machine which is used to increase the machine's momentum and thereby provide greater stability or a reserve of available power.

Question :

35.In case of a Diesel car, the pressure at the end of compression is of the order of

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45 bar

Question :

36.The connecting rod is attached to the piston by the

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piston pin

Question :

37.In a Diesel engine, the function of a fuel injector is to

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spray atomized fuel in the cylinder

Question :

38.The firing order for an opposed four cylinder l.C. engine is

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1-4-3-2.

Note:-Firing order. The firing order is the sequence of power delivery of each cylinder in a multi-cylinder reciprocating engine. This is achieved by sparking of the spark plugs in a gasoline engine in the correct order, or by the sequence of fuel injection in a Diesel engine.

Question :

39.The two kinds of piston rings are

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compression and oil-control rings.

Question :

40.The heat transfer from coolant to air in the radiator of an automobile engine takes place by

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convection and radiation

Note:-Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock. Convection takes place through advection, diffusion or both.

In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.