ETD Quiz (Module 5)

The compression ratio is the ratio of

• Swept volume to total volume

• Total volume to swept volume

• Total volume to clearance volume

• Swept volume to clearance volume

What is the relation between compression ratio and the efficiency of the Otto cycle?

• efficiency decreases with increase in compression ratio

• efficiency increases with increase in compression ratio

• efficiency does not affected by change in compression ratio

• none of the above

For the same maximum pressure and temperature, what is the relation among the efficiencies of the Otto cycle, the Diesel cycle and the Dual cycle?

• η Dual > ηDiesel > ηOtto

• ηDiesel > ηDual > ηOtto

• ηDiesel > ηOtto > ηDual

• ηOtto > ηDiesel > ηDual

The working medium of a air standard cycle has constant …….. throughout the cycle

• pressure

• volume

• specific heat

• mass

Other name for diesel cycle is

• Limited pressure cycle

• Constant volume cycle

• Constant pressure cycle

• Mixed cycle

Air standard cycle uses ___ as a working medium

• Perfect gas

• Real gas

• Ideal gas

• Natural gas

The thermal efficiency of petrol and gas engines is about

• 15%

• 30%

• 50%

• 70%

Otto cycle consists of

• 2 Constant volume and 2 adiabatic process

• 2 Constant pressure and 2 adiabatic process

• 2 Constant temperature and 2 adiabatic process

• 2 Constant volume and 2 isothermal process

If the compression ratio of petrol engine is increased from 5 to 7, what

is the percentage increase in efficiency

• 8

• 11

• 14

• 19

Petrol engine runs on

• Carnot cycle

• Otto cycle

• Diesel cyclee

• Dual cycle