C1 - Engines

Question 1

What do heat engines do?

Answer 1

Convert heat energy transferring from hot to cold into work

Question 2

What type of device converts heat energy transferring from hot to cold into work?

Answer 2

Heat engine

Question 3

When calculating the efficiency of a heat engine, what is Q_out?

Answer 3

Heat energy that leaves the engine

Question 4

When calculating the efficiency of a heat engine, what symbol is used for the heat energy that leaves the engine?

Answer 4

Q_out

Question 5

When calculating the efficiency of a heat engine, what is Q_in?

Answer 5

Heat energy put into the engine

Question 6

When calculating the efficiency of a heat engine, what symbol is used for the heat energy put into the engine?

Answer 6

Q_in

Question 7

When calculating the efficiency of a heat engine, what is T_C?

Answer 7

Temperature of the cold object

Question 8

When calculating the efficiency of a heat engine, what symbol is used for the temperature of the cold object?

Answer 8

T_C

Question 9

When calculating the efficiency of a heat engine, what is T_H?

Answer 9

Temperature of the hot object

Question 10

When calculating the efficiency of a heat engine, what symbol is used for the temperature of the hot object?

Answer 10

T_H

Question 11

What are the five stages in the operation of a heat engine?

Answer 11

Intake, compression, ignition, expansion, exhaust

Question 12

What happens during intake in a heat engine?

Answer 12

A fuel and air mixture is taken into the piston

Question 13

Which stage in the operation of a heat engine involves a fuel and air mixture being taken into the piston?

Answer 13

Intake

Question 14

What happens to volume and pressure in the piston during intake?

Answer 14

Volume increases. No change in pressure

Question 15

What happens during compression in a heat engine?

Answer 15

The piston compresses the fuel and air mixture adiabatically

Question 16

Which stage in the operation of a heat engine involves the piston compressing the fuel and air mixture adiabatically

Answer 16

Compression

Question 17

What happens to volume and pressure in the piston during compression?

Answer 17

Volume decreases. Pressure increases

Question 18

What happens during ignition in a heat engine?

Answer 18

The fuel and air mixture is ignited

Question 19

Which stage in the operation of a heat engine involves the fuel and air mixture being ignited

Answer 19

Ignition

Question 20

What happens to volume and pressure in the piston during ignition?

Answer 20

Large increase in pressure. No change in volume

Question 21

What happens during expansion in a heat engine?

Answer 21

The gas expands adiabatically and does work on the piston to push it down

Question 22

Which stage in the operation of a heat engine involves the gas expanding adiabatically and doing work on the piston to push it down?

Answer 22

Expansion

Question 23

What happens to volume and pressure in the piston during expansion?

Answer 23

Volume increases. Pressure decreases

Question 24

What happens during exhaust in a heat engine?

Answer 24

The piston is opened and exhaust gases leave the piston

Question 25

Which stage in the operation of a heat engine involves the piston opening and exhaust gases leaving the piston?

Answer 25

Exhaust

Question 26

What happens to volume and pressure in the piston during expansion?

Answer 26

Pressure decreases first, then volume decreases

Question 27

This graph shows a pressure-volume graph for an ideal heat engine. How would the graph be different for a real heat engine?

Answer 27

The corners would be round and the volume inside the graph would be smaller