## Engineering Thermodynamics The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when

Process is isentropic and specific heat does not change with temperature
Process is isothermal
Process is isentropic

Hard coke
Pulverized coal
Soft coke
Bituminous coal

## Engineering Thermodynamics Diesel cycle consists of __________ processes.

One constant pressure, one constant volume and two isentropic
Two constant volume and two isentropic
Two constant volume and two isothermal
Two constant pressure and two isentropic

## Engineering Thermodynamics For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

V/T = constant, if p is kept constant
T/P = constant, if v is kept constant
P/T = constant, if v is kept constant
P v = constant, if T is kept constant

## Engineering Thermodynamics The efficiency of Diesel cycle depends upon

Pressure ratio
Temperature limits
Cut-off ratio and compression ratio
Compression ratio

## Engineering Thermodynamics The mass of excess air supplied is equal to

(100/23) × Mass of excess carbon
(23/100) × Mass of excess oxygen
(100/23) × Mass of excess oxygen
(23/100) × Mass of excess carbon