Work done by a gas

In the Otto (Engine) Cycle, what is happening to the gas in the cylinder during stage 3 in the image?

• Gas is compressed

• Combustion (gas is burned)

• Gas expands

• Exhaust value is opened

In the Otto Cycle, what type of transition is stage 3 in the image?  

• Exothermal

• Isothermal

• Endothermal

• Icothermal

The gas in each piston of a V6 (six valves) has a volume of 100cm3 this increases to 300cm3 at a pressure of 200 kpa. Find the total work done by all the pistons.  (1cm³ = 1x10^-6m³).

• 40J

• 240J

• 300J

• 50J

What do Adiabatic and Isothermal mean? 

  

  

 

 

• Doesn’t lose temperature, constant temperature

• Increases temperature, constant energy

• No heat exchange, increases temperature

• No heat exchange, constant temperature

What is the equation for the work done by an expanding gas?

• P = W/t

• W = p dV

• Ep = mgh

• W = fs

What happens to the pressure of a gas as it expands (volume increases)?

• Stays constant

• Increases

• Decreases

• Fluctuates

What is ignited in an internal combustion engine?

• air fuel mixture

• air

• oxygen

• air resistance

What does delta mean when written in equations?

• Change in

• to the power of

• divide by

• multiplied

Is work done by expanding or contracting gas?

• Expanding

• Contracting

How much work is done by a gas at 800kPa that expands from 50cm³ to 350cm³ ? (1cm³ = 1x10^-6m³)

• 100J

• 150J

• 240J

• 300J