Power Engineering Chapter 68
Showing posts with label Power Engineering Chapter 68. Show all posts
Showing posts with label Power Engineering Chapter 68. Show all posts

Steam engines are still used today for?

Steam engines are still used today for?



a. For fast rotational speed
b. For reversal of rotational direction
c. For driving gas engines
d. For its low cost





Answer: B

A steam engine's crosshead:

A steam engine's crosshead:




a. Imparts angular motion to the piston rod
b. Converts linear motion of the piston rod into angular motion
c. Imparts linear motion to the connecting rod
d. Does not require any lubrication
e. Is often called the "gudgeon".



Answer: B

Large power production plants tend to be of the thermal type because they can burn solid fuels and:

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 the cheapest
e. They require the least amount of manpower




Answer: C

Connecting rods on a steam engine:

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





Answer: A

When possible, a wise and simple method of checking the bearings of operating equipment involves:

When possible, a wise and simple method of checking the bearings of operating equipment involves:




a. Checking the oil quality leaving each bearing
b. Checking the oil quantity leaving each bearing
c. Getting accustomed to normal operating temperature and vibration by feel
d. Noticing the normal operating scent of each bearing
e. Observing the bearing temperature on a thermometer






Answer: C

The slide valve of a steam engine is designed to:

The slide valve of a steam engine is designed to:



a. Allow the piston to slide more freely
b. Drain the condensate from the cylinder during warm-up
c. Provide lubrication for the steam engine
d. Allow steam to enter and leave the cylinder
e. Prevent the engine from over speeding





Answer: D

Despite their size and complexity, steam plants are widely used because:

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





Answer: E

A steam engine piston:

A steam engine piston:



a. Moves fastest at the end of its stroke
b. Produces the most force at the end of its stroke
c. Is lubricated with crankcase oil by the splash method
d. Moves fastest at the mid point of its stroke
e. Needs no lubrication






Answer: D

A "heat engine" is an operating cycle that uses a working fluid to convert:

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




Answer: E

The term "prime mover" refers to:

The term "prime mover" refers to:




a. All heat engines
b. A device that uses a source of energy to produce mechanical motion
c. Electric motors only
d. Steam and gas turbines only
e. thermal generating stations




Answer: B

Which of the following is a prime mover ?

Which of the following is a prime mover ?



a. An electric generator
b. A gas turbine
c. A centrifugal pump
d. An air compressor
e. A boiler






Answer: B
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