Prime Movers Final Exam UPDATED
ACTUAL Questions and CORRECT
Answers
Despite their size and complexity, steam plants are widely used because:
a) of their low emissions of pollutants
b) they are easily located in an urban environment
c) they can be run by untrained personnel
d) they require minimal amounts of water
e) they can burn solid fuels such as coal and wood. - CORRECT ANSWER✔✔- E
Connecting Rods on a steam engine:
a) convert reciprocating motion to rotary motion
b) are used to move the slide valve
c) are only needed on vertical engines
d) are used to connect the piston to the slide valve
e) connects the inlet valve to the discharge valve - CORRECT ANSWER✔✔- A
A "heat engine" is an operating cycle that uses a working fluid to convert:
a) thermal energy to chemical energy
b) chemical energy to mechanical energy
c) thermal energy to electrical energy
d) mechanical energy to electrical energy
e) thermal energy to mechanical energy - CORRECT ANSWER✔✔- E
A single device which converts a natural source of energy to mechanical motion is a/an:
,a) prime mover
b) heat engine
c) electric motor
d) steam plant
e) alternator - CORRECT ANSWER✔✔- A
A gasoline engine is a "heat engine". What is its working fluid?
a) glycol
b) gasoline
c) air
d) glycol and water
e) gasoline and air - CORRECT ANSWER✔✔- E
What is the main advantage of using the expansive properties of steam?
a) reliability
b) speed of response
c) economy
d) lower steam pressures can be used
e) superheated steam can be used - CORRECT ANSWER✔✔- C
Thinking of a steam engine and its construction, what does "eccentric" mean?
a) strange
b) out-of-center
c) economical
d) redundant
e) bi-directional - CORRECT ANSWER✔✔- B
,On a steam engine, what is the purpose of a "flywheel"
1. it prevents an over speed condition
2. It dampens speed fluctuations
3. It allows the direction of rotation to be changed
4. It carries the engine over dead center.
a) 1, 2
b) 1, 3
c) 1, 4
d) 2, 3
e) 2, 4 - CORRECT ANSWER✔✔- E
Advantages of a steam engine include:
1. It is possible to change the direction of rotation without the use of gearing
2. they have a high rotational speed
3. they are simple and rugged
4. they have a slow rotational speed without the need for reduction gearing
a) 1, 2
b) 3, 4
c) 1, 2, 3
d) 1, 3, 4
e) 2, 3, 4 - CORRECT ANSWER✔✔- D
A prime mover is
a) an electric motor
b) a steam turbine
, c) a centrifugal pump
d) an air compressor
e) a boiler - CORRECT ANSWER✔✔- B
Large power production plants tend to be of the thermal type because they can burn solid
fuels and:
a) they are the least expensive to build
b) the noise level is much less than internal combustion engines
c) the heat cycle they use is the most efficient
d) solid fuels are the most plentiful and cheapest
e) require the least amount of manpower - CORRECT ANSWER✔✔- C
A steam engine will have the steam supply to the cylinder shut off once the piston has
travelled
a) 25 to 35% of its stroke
b) 75 to 90% of its stroke
c) 15 to 20% of its stroke
d) 55 to 65% of its stroke
e) 90 to 95% of its stroke - CORRECT ANSWER✔✔- A
The reciprocating motion of a steam engine is converted to rotary motion
a) at the end of the piston stroke
b) in the steam cylinder
c) via the valve eccentric
d) at the crankshaft
e) via the valve gear - CORRECT ANSWER✔✔- D
The crosshead of a steam engine
ACTUAL Questions and CORRECT
Answers
Despite their size and complexity, steam plants are widely used because:
a) of their low emissions of pollutants
b) they are easily located in an urban environment
c) they can be run by untrained personnel
d) they require minimal amounts of water
e) they can burn solid fuels such as coal and wood. - CORRECT ANSWER✔✔- E
Connecting Rods on a steam engine:
a) convert reciprocating motion to rotary motion
b) are used to move the slide valve
c) are only needed on vertical engines
d) are used to connect the piston to the slide valve
e) connects the inlet valve to the discharge valve - CORRECT ANSWER✔✔- A
A "heat engine" is an operating cycle that uses a working fluid to convert:
a) thermal energy to chemical energy
b) chemical energy to mechanical energy
c) thermal energy to electrical energy
d) mechanical energy to electrical energy
e) thermal energy to mechanical energy - CORRECT ANSWER✔✔- E
A single device which converts a natural source of energy to mechanical motion is a/an:
,a) prime mover
b) heat engine
c) electric motor
d) steam plant
e) alternator - CORRECT ANSWER✔✔- A
A gasoline engine is a "heat engine". What is its working fluid?
a) glycol
b) gasoline
c) air
d) glycol and water
e) gasoline and air - CORRECT ANSWER✔✔- E
What is the main advantage of using the expansive properties of steam?
a) reliability
b) speed of response
c) economy
d) lower steam pressures can be used
e) superheated steam can be used - CORRECT ANSWER✔✔- C
Thinking of a steam engine and its construction, what does "eccentric" mean?
a) strange
b) out-of-center
c) economical
d) redundant
e) bi-directional - CORRECT ANSWER✔✔- B
,On a steam engine, what is the purpose of a "flywheel"
1. it prevents an over speed condition
2. It dampens speed fluctuations
3. It allows the direction of rotation to be changed
4. It carries the engine over dead center.
a) 1, 2
b) 1, 3
c) 1, 4
d) 2, 3
e) 2, 4 - CORRECT ANSWER✔✔- E
Advantages of a steam engine include:
1. It is possible to change the direction of rotation without the use of gearing
2. they have a high rotational speed
3. they are simple and rugged
4. they have a slow rotational speed without the need for reduction gearing
a) 1, 2
b) 3, 4
c) 1, 2, 3
d) 1, 3, 4
e) 2, 3, 4 - CORRECT ANSWER✔✔- D
A prime mover is
a) an electric motor
b) a steam turbine
, c) a centrifugal pump
d) an air compressor
e) a boiler - CORRECT ANSWER✔✔- B
Large power production plants tend to be of the thermal type because they can burn solid
fuels and:
a) they are the least expensive to build
b) the noise level is much less than internal combustion engines
c) the heat cycle they use is the most efficient
d) solid fuels are the most plentiful and cheapest
e) require the least amount of manpower - CORRECT ANSWER✔✔- C
A steam engine will have the steam supply to the cylinder shut off once the piston has
travelled
a) 25 to 35% of its stroke
b) 75 to 90% of its stroke
c) 15 to 20% of its stroke
d) 55 to 65% of its stroke
e) 90 to 95% of its stroke - CORRECT ANSWER✔✔- A
The reciprocating motion of a steam engine is converted to rotary motion
a) at the end of the piston stroke
b) in the steam cylinder
c) via the valve eccentric
d) at the crankshaft
e) via the valve gear - CORRECT ANSWER✔✔- D
The crosshead of a steam engine
