ESE 2021 ME Technical Quiz || Combustion in SI & CI Engine for ESE & GATE ME Exams

Question 1

Which of the following increase the diesel knocking tendency?
1). Decreased compression ratio
2). Decreased engine speed
3). Retarded injection timing
4). Supercharging

Question 2

Detonation in SI engine occur due to _________.

Question 3

Which of the following mixture / ratio requires during idling condition in petrol engine ___________?

Question 4

Which of the following statement is/are TRUE?

(a) the ignition delay period in SI engines consist of only chemical delay.

(b) The ignition delay period in CI engine consist of only physical delay

(c) The ignition delay period in SI engine consists of physical and chemical delay

(d) The ignition delay period in CI engine consists of physical and chemical delay.

Question 5

In case of S.I. engine to have high thermal efficiency the fuel air mixture ratio should be ___________.