Otto, Diesel and Brayton Cycle

A gas turbine power plant uses which of these thermodynamic cylce?

• Otto

• Diesel

• Rankine

• none of these

Which of the following is true for the Brayton cycle?a) b) heat is added reversibly at constant pressurec) air expands in turbine reversibly and adiabaticallyd) all of the mentioned

• first air is compressed reversibly and adiabatically, then heat added at constant volume

• first air is compressed reversibly and adiabatically, then heat added at constant volume and heat rejected at constant pressure

• first air is compressed reversibly and adiabatically, then heat added at constant pressure

• first air is compressed reversibly and adiabatically, then heat added at constant pressure and rejected at constant volume

A steam power plant works on ____ and a gas turbine works on ____

• a) both work on Rankine cycle

• b) both work on Brayton cycle

• c) Brayton cycle, Rankine cycle

• d) Rankine cycle, Brayton cycle

The Otto cycle is the

• air standard cycle of CI engine

• air standard cycle of SI engine

• vapour power cycle of CI engine

• vapour power cycle of SI engine

In a four-stroke internal combustion engine,

• a) the piston does four complete strokes within cylinder for each cycle

• b) for each cycle, the crankshaft completes two revolutions

• c) both of the mentioned

• d) none of the mentioned

In Diesel cycle heat addition takes place at _____________

• constant volume

• constant temp

• constant pressure

• c) constant temperature and pressure

A diesel engine has compression ratio from ____________

• 8 to 10

• 50 to 60

• 16 to 20

• 6 to 10

It is for which cycle

• Otto

• Diesel

• Brayton

• Rankine

Cut-off ratio is term used for ....................

• Otto

• Diesel

• Brayton

• Rankine

For the same maximum pressure and temperature for both cycles, under ideal conditions which has more efficiency,

• Otto

• Diesel

• Both equal

• cannot be predicted