Power Engineering 4th Class unit B 10
chapter 1 Questions & correct answers.
The relative humidity is plotted on a psychrometric chart along:
Choose one answer.
a. The Lines curving upwards from the lower left to the upper right side of the chart
b. The Horizontal axis on the bottom of the chart
c. Vertical lines, and read along the horizontal scale at the bottom of the chart
d. The Saturation line and plotted along the horizontal lines
e. Horizontal lines and read along the left side scale ANS - a
The specific volume of air is expressed as the volume of:
Choose one answer.
a. 1 kg of air at 101.325 kPa in cm3
b. 0.833 kg of air at standard pressure and temperature in m3
c. 1 kg of air at 101.325 kPa and 21 degrees Celsius in m3
d. 1 g of air occupied at any temperature and pressure
e. 1 kg of air, regardless of temperature and pressure ANS - c
The volume of standard air is _____ m3/kg of dry air.
Choose one answer.
a. 0.533
b. 0.633
c. 0.733
d. 0.833
e. 0.933 ANS - d
, The wet-bulb temperature is plotted on a psychrometric chart on the:
Choose one answer.
a. Right vertical axis
b. Left vertical axis
c. Lines which originate at the saturation line and slope downward to the right
d. Horizontal axis on the bottom of the chart
e. Relative humidity lines ANS - c
The dew point is the:
Choose one answer.
a. Dry bulb temperature on a psychrometer
b. Temperature at which water vapour will start to be absorbed into the air
c. Temperature below which water vapour will start to condense out of the air
d. Pressure below which water vapour will start to condense out of the air
e. Temperature at which water will start to evaporate ANS - c
The specific volume on a psychrometric chart:
Choose one answer.
a. Is plotted on vertical lines and read on the horizontal scale at the bottom of the chart
b. Is plotted on horizontal lines and read on the vertical scale on the left side of the chart
c. Is plotted on horizontal lines and read on the vertical scale on the right side of the chart
d. Has its lines originate on the volume scale along the saturation line which slope steeply down to the
right of the chart
e. Is plotted on vertical lines and read on the horizontal scale at the top of the chart ANS - d
Air that is fully saturated has a relative humidity of:
Choose one answer.
a. 90%
chapter 1 Questions & correct answers.
The relative humidity is plotted on a psychrometric chart along:
Choose one answer.
a. The Lines curving upwards from the lower left to the upper right side of the chart
b. The Horizontal axis on the bottom of the chart
c. Vertical lines, and read along the horizontal scale at the bottom of the chart
d. The Saturation line and plotted along the horizontal lines
e. Horizontal lines and read along the left side scale ANS - a
The specific volume of air is expressed as the volume of:
Choose one answer.
a. 1 kg of air at 101.325 kPa in cm3
b. 0.833 kg of air at standard pressure and temperature in m3
c. 1 kg of air at 101.325 kPa and 21 degrees Celsius in m3
d. 1 g of air occupied at any temperature and pressure
e. 1 kg of air, regardless of temperature and pressure ANS - c
The volume of standard air is _____ m3/kg of dry air.
Choose one answer.
a. 0.533
b. 0.633
c. 0.733
d. 0.833
e. 0.933 ANS - d
, The wet-bulb temperature is plotted on a psychrometric chart on the:
Choose one answer.
a. Right vertical axis
b. Left vertical axis
c. Lines which originate at the saturation line and slope downward to the right
d. Horizontal axis on the bottom of the chart
e. Relative humidity lines ANS - c
The dew point is the:
Choose one answer.
a. Dry bulb temperature on a psychrometer
b. Temperature at which water vapour will start to be absorbed into the air
c. Temperature below which water vapour will start to condense out of the air
d. Pressure below which water vapour will start to condense out of the air
e. Temperature at which water will start to evaporate ANS - c
The specific volume on a psychrometric chart:
Choose one answer.
a. Is plotted on vertical lines and read on the horizontal scale at the bottom of the chart
b. Is plotted on horizontal lines and read on the vertical scale on the left side of the chart
c. Is plotted on horizontal lines and read on the vertical scale on the right side of the chart
d. Has its lines originate on the volume scale along the saturation line which slope steeply down to the
right of the chart
e. Is plotted on vertical lines and read on the horizontal scale at the top of the chart ANS - d
Air that is fully saturated has a relative humidity of:
Choose one answer.
a. 90%
