In precombustion chamber in diesel engine________________?

A. The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture
B. Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
C. Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
D. There are no valves

Scavenging air in diesel engine means___________________?

A. air used for combustion sent under pres-sure
B. forced air for cooling cylinder
C. burnt air containing products of combustion
D. air used for forcing burnt gases out of engine’s cylinder during the exhaust period
E. air fuel mixture

Pour point of fuel oil is the_________________?

A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B. temperature at which it solidifies or congeals
C. it catches fire without external aid
D. indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
E. temperature at which it flows easily

Normal heptane_______________?

A. accelerates auto-ignition
B. helps to resist auto-ignition
C. does not affect auto-ignition
D. has no relation with auto-ighition
E. retards auto-ignition

Aluminium bronze contains__________________?

A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 10% aluminium and 90% tin

Amorphous material is one___________________?

A. in which atoms align themselves in a geometric pattern upon solidification
B. in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
C. which is not attacked by phosphorous
D. which emits fumes on melting
E. none of the above

Bell metal contains_____________________?

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 70-75% copper and rest zinc and tin

Which is false statement about multistage compression ?

A. Power consumption per unit of air delivered is low
B. Volumetric efficiency is high
C. It is best suited for compression ratios around 7:1
D. The moisture in air is condensed in the intercooler
E. Outlet temperature is reduced

Water gas is produced by ___________________ ?

A. carbonisation of coal
B. passing steam over incandescent coke
C. passing air and a large amount of steam over waste coal at about 65°C
D. partial combustion of caol, eke, anthractie coal or charcoal in a mixed air steam blast
E. same way as the natural gas

Volumetric efficiency is_____________________?

A. the ratio of stroke volume to clearance volume
B. the ratio of the air actually delivered to the amount of piston displacement
C. reciprocal of compression ratio
D. index of compressor performance
E. proportional to compression ratio

Brass contains___________________?

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 70% copper and 30% tin

Bronze contains_____________________?

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 90% copper and 10% zinc

Hardness of steel depends on_________________?

A. amount of carbon it contains
B. the shape and distribution of the car-bides in iron
C. method of fabrication
D. contents of alloying elements
E. the quality of ore from which it is made

Free cutting steels_____________________?

A. are used where ease in machining is the criterion
B. contain carbon in free form
C. require least cutting force
D. do not exist
E. can be cut freely even under adverse conditions