Power Engineering - 4B2 Practice Questions With Complete
Solutions
Refrigeration compressor housings fall into three types. These
are:
1. hermetic
2. semi-coalescer
3. open
4. closed
5. coalescer
6. semi-hermetic
a. 2, 3, 5
b. 1, 4, 6
c. 1, 3, 6
d. 2, 4, 5
c. 1, 3, 6
An air filter should always be installed at the _________ of the
air compressor system:
a. air receiver
b. air dryer
c. air inlet line
d. room air vents
c. air inlet line
,The heat generated by a gas compressor must be removed
through:
a. intercoolers and aftercoolers
b. water jackets and fin coils
c. chillers and water jackets
d. intercoolers and water jackets
a. intercoolers and aftercoolers
In a sliding vane compressor, discharge pressure may be as high
as:
a. 1000 kPa
b. 2000 kPa
c. 3000 kPa
d. 4000 kPa
a. 1000 kPa
Compressors are divided into two classifications. They are:
a. dynamic and positive displacement
b. dynamic and centrifugal
c. positive displacement and rotary
d. rotary and dynamic
a. dynamic and positive displacement
This type of refrigeration compressor is called _________
because one end of the crankshaft extends outside the crankcase
and a sealing arrangement is required to prevent refrigerant from
,escaping along the shaft:
a. hermetic
b. open
c. semi-hermetic
d. coalescer
b. open
This type of compressor valve consists of a thin, flexible piece
of spring steel, part of which covers the suction or discharge port
in the valve plate:
a. flexible ring
b. flexible seat
c. flexible port
d. flexible reed
d. flexible reed
The following are disadvantages of compressed air tools:
1. more expensive than electrically driven tools
2. shockhazard
3. more difficult to store
4. air transmission piping is more expensive than electrical wire
5. air transmission piping is more difficult to install than
electrical wire
6. air transmission piping is more hazardous than electrical wire
a. 1, 3, 5
b. 1, 4, 5
, c. 1, 4, 6
d. 3. 4. 5
b. 1, 4, 5
If water is used for cylinder cooling, the cylinder must be made
with:
a. integral fins
b. a water jacket
c. a float chamber
d. water fins
b. a water jacket
This type of compressor is made up of two spiral disks that fit
together. One is stationary and the other rotates:
a. screw compressor
b. gear compressor
c. sliding vane compressor
d. scroll compressor
d. scroll compressor
If a packaged gas compressor system cannot be built to fit
highway regulations, it will be:
a. built smaller
b. transported by train
c. transported by plane
d. built in situ
Solutions
Refrigeration compressor housings fall into three types. These
are:
1. hermetic
2. semi-coalescer
3. open
4. closed
5. coalescer
6. semi-hermetic
a. 2, 3, 5
b. 1, 4, 6
c. 1, 3, 6
d. 2, 4, 5
c. 1, 3, 6
An air filter should always be installed at the _________ of the
air compressor system:
a. air receiver
b. air dryer
c. air inlet line
d. room air vents
c. air inlet line
,The heat generated by a gas compressor must be removed
through:
a. intercoolers and aftercoolers
b. water jackets and fin coils
c. chillers and water jackets
d. intercoolers and water jackets
a. intercoolers and aftercoolers
In a sliding vane compressor, discharge pressure may be as high
as:
a. 1000 kPa
b. 2000 kPa
c. 3000 kPa
d. 4000 kPa
a. 1000 kPa
Compressors are divided into two classifications. They are:
a. dynamic and positive displacement
b. dynamic and centrifugal
c. positive displacement and rotary
d. rotary and dynamic
a. dynamic and positive displacement
This type of refrigeration compressor is called _________
because one end of the crankshaft extends outside the crankcase
and a sealing arrangement is required to prevent refrigerant from
,escaping along the shaft:
a. hermetic
b. open
c. semi-hermetic
d. coalescer
b. open
This type of compressor valve consists of a thin, flexible piece
of spring steel, part of which covers the suction or discharge port
in the valve plate:
a. flexible ring
b. flexible seat
c. flexible port
d. flexible reed
d. flexible reed
The following are disadvantages of compressed air tools:
1. more expensive than electrically driven tools
2. shockhazard
3. more difficult to store
4. air transmission piping is more expensive than electrical wire
5. air transmission piping is more difficult to install than
electrical wire
6. air transmission piping is more hazardous than electrical wire
a. 1, 3, 5
b. 1, 4, 5
, c. 1, 4, 6
d. 3. 4. 5
b. 1, 4, 5
If water is used for cylinder cooling, the cylinder must be made
with:
a. integral fins
b. a water jacket
c. a float chamber
d. water fins
b. a water jacket
This type of compressor is made up of two spiral disks that fit
together. One is stationary and the other rotates:
a. screw compressor
b. gear compressor
c. sliding vane compressor
d. scroll compressor
d. scroll compressor
If a packaged gas compressor system cannot be built to fit
highway regulations, it will be:
a. built smaller
b. transported by train
c. transported by plane
d. built in situ
