PV curves

Which are true for adiabatic change?

• No work done

• Work is done

• Temperature changes

• Temperature is constant

• usually fast

An ideal gas undergoes isothermal expansion at 0 ^oC from 0.010 m³ to 0.200 m³. For 5 moles of gas, cal­culate the change in internal energy in J

Which of these refers to the power wasted in the moving engine components?

• brake power

• friction power

• indicated power

• output power

Which of these refers to the power developed by the pistons?

• brake power

• friction power

• indicated power

• output power

For a given engine, which quantity is largest?

• brake power

• friction power

• indicated power

• output power

• Adiabatic

• Isothermal

• constant pressure

• neither adiabatic nor isothermal

A car has an indicated power of 100kW. Its measured power output is 75bhp. Calculate the frictional power.

• 25kW

• 125kW

• 44kW

• 56kW

The area inside an indicator diagram gives 960J. If a four-stroke engine is rotating at 4500rpm, calculate the indicated power per cylinder.

• 72kW

• 36kW

• 43.2MW

• 288kW