091. If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on
Too rich mixture
092. In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as
Relief valve
093. The purpose of a balancer shaft is to
Reduce vibrations caused by the crankshaft rotation
094. The function of a radiator fan in the cooling system is that
It blows air through the radiator when necessary
096. The tool material, for faster machining, should have
(A) Wear resistance
(B) Red hardness
(C) Toughness
(D) All of these
097. Diesel engine can work on very lean air fuel ratio of the order of 30 :1. A petrol engine can also work on such a lean ratio provided
can not work as it is impossible.
098. Pour point of fuel oil is the
temperature at which it solidifies or congeals.
099. A front stabilizer bar is used to
Control suspension movement and body roll.
100. The tyre rotation is generally done at
10,000 km.
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