Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?
(A) not true
(B) true at full load
(C) true at part load
(D) true at both part and full load
(D) there could not be any such criterion
In order to prevent knock in the S.I. engines, the charge away from the spark plug should have___________________?
(A) low temperature
(B) low density
(C) long ignition delay
(D) rich mixture
(D) all of the above
To reduce the possibility of knock in the C.I. engines, the first elements of fuel and air should have_______________?
(A) high temperature
(B) high density
(C) short delay
(D) reactive mixture
(D) all of the above
Piston rings are plated with chromium,cadmium or phosphate in order to__________________?
(A) reduce cost
(B) improve surface finish
(C) prevent clogging
(D) reduce wear and eliminate scuffing
(D) improve heat transfer
The pistons are usually given a coating such as tin plating in order to________________?
(A) reduce weight
(B) conduct heat efficiently
(C) reduce possibility of scoring
(D) reduce friction
(D) increase lubrication effect
If overhead clearance is less, then the following type of engine should be selected__________________?
(A) V-type
(B) In-line
(C) Vertical
(D) Horizontal
(D) Radial
The top piston ring nearer to the piston crown is known as_____________________?
(A) compression ring
(B) oil ring
(C) scrapper ring
(D) groove ring
(D) leading ring
Piston rings are usually made of___________________?
(A) cast iron
(B) aluminium
(C) phosphor bronze
(D) babbitt
(D) carbon steel
The m.e.p. of a diesel cycle having fixed compression ratio with increase in cut-off will_________________?
(A) increase
(B) decreae
(C) be unaffected
(D) depend on other factors
(D) unpredictable
Detonation can be controlled by_____________________?
(A) varying compression ratio
(B) using lian mixture
(C) retarding the spark timing
(D) reducing the r.p.m.
(D) increasing inlet pressure