In an ideal diesel cycle, indicate whether the following statements are true or false: a)-all the processes are internally reversible. b)- cycle efficiency increases with the maximum temperature. c)- cycle efficiency depends on the compression ratio only.

a)True

b)False

c)False

Explanation:

We know that ideal diesel cycle is the ideal cycle for all practically used diesel cycle.  Ideal cycle do not have any internal or internal ir-reversibility ,all the processes are reversible process.

In diesel engine there are four process

Process 1-2:Reversible adiabatic compression process

Process 2-3:Constant pressure heat addition

Process 3-4-:Reversible adiabatic expansion process

Process 4-1:Constant volume heat rejection

Efficiency of diesel engine  given as follows

So it is clear that Efficiency is not only a function of compression ratio(r) only.

When maximum temperature will increases then cut of ratio(ρ)also will increases and this leads to decrease in the efficiency of cycle.

So

a)True

b)False

c)False

answer:

(b)

explanation: