QUIZ 01 TE

Thermal efficiency of a heat engine is defined as

• Work done/Heat supplied

• Indicated Power/Brake Power

• Brake Power/Indicated Power

• none of the above

Air-standard efficiency of Otto cycle is given by

• 1-(1/r)^((γ-1)/γ)

• 1-(r)^(γ-1)

• r^(γ-1)-1

• 1-(1/r)^(γ-1)

The mean effective pressure of an engine is defined as

• Work done/Stroke volume

• Work done/cycle/Cylinder volume

• Work done/cycle/Stroke volume

• Work done/kg/Stroke volume

Which statement is true for Otto cycle?

• Heat addition at constant volume and heat rejection at constant volume

• Heat addition at constant volume and heat rejection at constant pressure

• Heat addition at constant pressure and heat rejection at constant volume

• Heat addition at constant pressure and heat rejection at constant pressure

Air standard Otto cycle consists of

• two isothermal processes and two constant-volume processes

• two isothermal processes and two constant-pressure processes

• two isentropic processes and two constant-volume processes

• two isothermal processes and two isentropic processes

Which statement is true for Diesel cycle?

• Heat addition at constant volume and heat rejection at constant volume

• Heat addition at constant volume and heat rejection at constant pressure

• Heat addition at constant pressure and heat rejection at constant volume

• Heat addition at constant pressure and heat rejection at constant pressure

Air standard Diesel cycle consists of

• two isothermal and two constant-volume processes

• two isentropic and two constant-pressure processes

• two isentropic and two constant-volume processes

• none of the above

The efficiency of air standard Otto cycle depends on

• pressure ratio in the cycle

• temperature ratio in the cycle

• Compression ratio in the cycle

• mean effective pressure

The efficiency of air standard Diesel cycle depends on

• cut-off ratio in the cycle

• compression ratio in the cycle

• both (a) and (b)

• none of above

Cut-off ratio is defined as

• Volume before compression/Volume after compression

• Volume after heat supply/Volume after compression

• Volume after expansion/Volume after compression

• Volume after expansion/Volume before expansion