ChE 123: Production of Power from Heat (2)

Question 1

higher mean effective pressure (MEP) means?

Answer 1

better engine performance and efficiency

Question 2

process of ICEs where intake-valve closes, piston moves upward compressing the mixture (increasing the pressure and temperature)

Answer 2

compression

Question 3

for these engines, fuel is burned within the engine itself

Answer 3

internal-combustion engines

Question 4

in this type of engine, combustion process occurs at approximately constant pressure

Answer 4

diesel engine

Question 5

process of ICEs where exhaust-valve opens, piston moves up pushing the gases out through the exhaust system

Answer 5

exhaust

Question 6

steam power plant uses steam as an inert medium, hence heat is transferred through walls of?

Answer 6

boiler tubes

Question 7

for internal-combustion engines, high temp. are?

Answer 7

internal

Question 8

The cycle for ideal gas-turbine engine is represented by?

Answer 8

brayton cycle

Question 9

actual type of otto engine cycle

Answer 9

otto engine cycle

Question 10

process of ICEs where explosion pushes piston downward, expanding the gases (by-product of combustion)

Answer 10

power/combustion

Question 11

process of ICEs where intake-valve opens, piston moves down while mixture (usually fuel/air mixture) enters the cylinder

Answer 11

intake

Question 12

these burns fuel directly inside the working chamber

Answer 12

internal combustion engines (ICEs)

Question 13

for internal-combustion engines, these serves as the working medium

Answer 13

combustion products

Question 14

in steam power plant, these limit the maximum temp. and pressure

Answer 14

walls of boiler tubes

Question 15

this is usually used in automobiles

Answer 15

otto engine

Question 16

3 types of internal-combustion engines

Answer 16

1. otto engines
2. diesel engines
3. gas-turbine engines

Question 17

ideal type of otto engine cycle

Answer 17

air-standard otto cycle

Question 18

this type of engine is driven by high-temp. gases from a combustion chamber

Answer 18

gas-turbine engine

Question 19

it is the most common ICE

Answer 19

otto engine

Question 20

it is the ratio of the net work done to the volume displacement of the piston

Answer 20

mean effective pressure (MEP)

Question 21

4 general process of common internal-combustion engines

Answer 21

1. intake
2. compression
3. power/combustion
4. exhaust

Question 22

in these engines, work is produced as the high-temperature gases exert force on a moving mechanical component

Answer 22

internal combustion engines

Question 23

ideal type of diesel engine cycle

Answer 23

air-standard diesel cycle

Question 24

steam power plant uses steam as an _________________, hence heat is transferred through walls of boiler tubes

Answer 24

inert medium

Question 25

this is produced because of the high-temp. gases exert force on a moving mechanical component

Answer 25

work

Question 26

4 strokes taking place in an otto engine

Answer 26

1. intake stroke 2. second stroke 3. third stroke 4. fourth of exhaust stroke

Question 27

process of ICEs where ignition source (usually spark plug) ignites the compressed mixture

Answer 27

power/combustion