Compression loss in I.C engines occurs due to_________________?
(A) leaking piston rings
(B) use of thick head gasket
(C) clogged air-inlet slots
(D) increase in clearance volume caused b bearing-bushing wear
(D) all of the above
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed____________________?
(A) 80°C
(B) 120°C
(C) 180°C
(D) 240°C
(D) 320°C
The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?
(A) increase
(B) decrease
(C) be independent
(D) may increase or decrease depending on other factors
(D) none of the above
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?
(A) 2%
(B) 4%
(C) 8%
(D) 14%
(D) 27%.
The pressure at the end of compression in the case of diesel engine is of the order of___________________?
(A) 6 kg/cm
(B) 12kg/cmz
(C) 20 kg/cmz
(D) 27.5 kg/cmz
(D) 35 kg/cm
In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
(A) same
(B) less
(C) more
(D) variable
(D) more/less depending on engine capacity.
Polymerisation is a chemical process in which molecules of a compound become________________?
(A) larger
(B) slowed down
(C) smaller
(D) liquid
(D) gaseous
Gaseous-fuel guarantees are based on___________________?
(A) calorific value of oil
(B) low heat value of oil
(C) high heat value of oil
(D) mean heat value of oil
(D) all of the above
A 75 cc engine has following parameter as 75 cc ___________________?
(A) fuel tank capacity
(B) lub oil capacity
(C) swept volume
(D) cylinder volume
(D) clearance volume
When crude oil is heated, then which of the following hydrocarbon is given off first______________?
(A) kerosene
(B) gasoline
(C) paraffin
(D) diesel
(D) natural gas