Power Engineering 3B2 Chapter 10 Questions With
Complete Solutions
A good refrigerant should have a:
a. High net refrigeration effect
b. Low net refrigeration effect to save power
c. Medium refrigeration effect
d. High condensing pressure
e. Condensing temperature. Correct Answers a
A good refrigerant should require a:
a. Low latent heat value
b. High temperature boiling point
c. High condensing temperature
d. High condensing pressure
e. Large amount of heat to evaporate. Correct Answers e
A refrigerant compressor may have:
a. A magnetic plug and integral air receiver.
b. A reverse osmosis membrane and emergency connecting rod.
c. An oil foam breaker and a magnetic plug.
d. An oil foam plug and a magnetic foam breaker.
e. Teflon drive couplings and reverse RPM indication. Correct
Answers c
A refrigerant is toxic at less than 400 ppm and has a LFL of less
than 100 g/m3 at room conditions. It has a higher toxicity. It is
class:
a. A2
b. A3
c. B1
,d. B2
e. B3. Correct Answers e
A refrigerant is toxic at less than 400 ppm and has a LFL of
more than 100g/m3 at 21°C at standard ambient pressure. It is
class:
a. A1
b. A2
c. A3
d. B1
e. B2. Correct Answers e
A refrigerant is toxic at over 400 ppm and has an LFL less than
100g/m3
at 21°C, 101 kPa abs. It is class:
A1
A2
A3
B1
B2. Correct Answers c
A refrigerant may be defined as a:
a. Liquid that absorbs heat at high pressure and gives up heat at
low pressure
b. Fluid that absorbs heat at a low temperature and pressure and
gives up heat by condensing at a higher temperature and
pressure
c. Fluid that absorbs heat at a high temperature and pressure and
gives up heat by condensing at a lower temperature and
pressure
d. Medium for creating heat
, e. Fluid that absorbs heat at a high pressure. Correct Answers b
A simple condenser with low installation cost would be:
a. Water-cooled.
b. Air and water-cooled.
c. Enthalpy cooled.
d. Chloride cooled.
e. Air-cooled. Correct Answers e
A two stage, duplex compressor refrigeration system is used
where:
a. Moderate low temperatures are desired.
b. Extremely low temperatures are desired.
c. Small quantities of refrigerant are required.
d. High quantities of refrigerant are required.
e. The cost of refrigerant is high. Correct Answers b
A two stage, duplex compressor refrigeration system is usually
used for temperatures below:
a. -18°C
b. -20°C
c. -45°C
d. -51°C
e. -92°C. Correct Answers e
A/An _____ is usually provided between the low-pressure
discharge and high-pressure suction of a multi-stage
refrigeration system.
a. Condenser .
b. Receiver.
c. Purger .
Complete Solutions
A good refrigerant should have a:
a. High net refrigeration effect
b. Low net refrigeration effect to save power
c. Medium refrigeration effect
d. High condensing pressure
e. Condensing temperature. Correct Answers a
A good refrigerant should require a:
a. Low latent heat value
b. High temperature boiling point
c. High condensing temperature
d. High condensing pressure
e. Large amount of heat to evaporate. Correct Answers e
A refrigerant compressor may have:
a. A magnetic plug and integral air receiver.
b. A reverse osmosis membrane and emergency connecting rod.
c. An oil foam breaker and a magnetic plug.
d. An oil foam plug and a magnetic foam breaker.
e. Teflon drive couplings and reverse RPM indication. Correct
Answers c
A refrigerant is toxic at less than 400 ppm and has a LFL of less
than 100 g/m3 at room conditions. It has a higher toxicity. It is
class:
a. A2
b. A3
c. B1
,d. B2
e. B3. Correct Answers e
A refrigerant is toxic at less than 400 ppm and has a LFL of
more than 100g/m3 at 21°C at standard ambient pressure. It is
class:
a. A1
b. A2
c. A3
d. B1
e. B2. Correct Answers e
A refrigerant is toxic at over 400 ppm and has an LFL less than
100g/m3
at 21°C, 101 kPa abs. It is class:
A1
A2
A3
B1
B2. Correct Answers c
A refrigerant may be defined as a:
a. Liquid that absorbs heat at high pressure and gives up heat at
low pressure
b. Fluid that absorbs heat at a low temperature and pressure and
gives up heat by condensing at a higher temperature and
pressure
c. Fluid that absorbs heat at a high temperature and pressure and
gives up heat by condensing at a lower temperature and
pressure
d. Medium for creating heat
, e. Fluid that absorbs heat at a high pressure. Correct Answers b
A simple condenser with low installation cost would be:
a. Water-cooled.
b. Air and water-cooled.
c. Enthalpy cooled.
d. Chloride cooled.
e. Air-cooled. Correct Answers e
A two stage, duplex compressor refrigeration system is used
where:
a. Moderate low temperatures are desired.
b. Extremely low temperatures are desired.
c. Small quantities of refrigerant are required.
d. High quantities of refrigerant are required.
e. The cost of refrigerant is high. Correct Answers b
A two stage, duplex compressor refrigeration system is usually
used for temperatures below:
a. -18°C
b. -20°C
c. -45°C
d. -51°C
e. -92°C. Correct Answers e
A/An _____ is usually provided between the low-pressure
discharge and high-pressure suction of a multi-stage
refrigeration system.
a. Condenser .
b. Receiver.
c. Purger .
