_________ is the temperature to which the air must be cooled, at constant pressure, to produce saturation.  a. relative humidity  b. triple point temperature  c. dew point  d. critical point

_________ is the temperature to which the air must be cooled, at constant pressure, to produce saturation.  a. relative humidity  b. triple point temperature  c. dew point  d. critical point
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dew point
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Is define as the ratio of the actual pressure of the vapor  a. Relative Humidity  b. Humidity Ratio  c. Dew Point  d. Adiabatic Saturation

Description : Is define as the ratio of the actual pressure of the vapor  a. Relative Humidity  b. Humidity Ratio  c. Dew Point  d. Adiabatic Saturation

Last Answer : Relative Humidity

Is a steady flow process at total constant pressure through a control volume for which there is no heat?  a. Adiabatic Saturation Process  b. Dew point  c. Adiabatic Ratio  d. None of the above

Description : Is a steady flow process at total constant pressure through a control volume for which there is no heat?  a. Adiabatic Saturation Process  b. Dew point  c. Adiabatic Ratio  d. None of the above

Last Answer : Adiabatic Saturation Process

__________________ is a liquid at the saturations which has temperature equal to the boiling point corresponding to the existing pressure.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Description : __________________ is a liquid at the saturations which has temperature equal to the boiling point corresponding to the existing pressure.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Last Answer : Saturated Liquid

Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a (A) Higher dew point (B) Higher absolute (specific) humidity (C) Higher relative humidity (D) Higher wet bulb temperature

Description : Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a (A) Higher dew point (B) Higher absolute (specific) humidity (C) Higher relative humidity (D) Higher wet bulb temperature

Last Answer : (C) Higher relative humidity

On a day when the partial pressure of water vapor remains constant, what happens as the temperature rises?  a. the relative humidity increases  b. the relative humidity decreases  c. the relative humidity remains constant  d. the air would eventually become saturated

Description : On a day when the partial pressure of water vapor remains constant, what happens as the temperature rises?  a. the relative humidity increases  b. the relative humidity decreases  c. the relative humidity remains constant  d. the air would eventually become saturated

Last Answer : the relative humidity decreases

____________is the difference between the saturation temperature for the given pressure and the actual sub cooled liquid temperature.  a) Degrees of Superheat, °SH  b) Degrees of Sub cooled, °SB  c) Both a and b  d) None of the above

Description : ____________is the difference between the saturation temperature for the given pressure and the actual sub cooled liquid temperature.  a) Degrees of Superheat, °SH  b) Degrees of Sub cooled, °SB  c) Both a and b  d) None of the above

Last Answer : Degrees of Sub cooled, °SB

_____________ is the difference between the actual temperature of superheated vapor and the saturation temperature for the existing pressure.  a) Degrees of Superheat, °SH  b) Degrees of Sub cooled, °SB  c) Both a and b  d) None of the above

Description : _____________ is the difference between the actual temperature of superheated vapor and the saturation temperature for the existing pressure.  a) Degrees of Superheat, °SH  b) Degrees of Sub cooled, °SB  c) Both a and b  d) None of the above

Last Answer : Degrees of Superheat, °SH

_________________ is one which has a pressure higher than the saturation pressure corresponding to the existing temperature.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Description : _________________ is one which has a pressure higher than the saturation pressure corresponding to the existing temperature.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Last Answer : Compressed Liquid

________________ is one which has a temperature lower than the saturation temperature corresponding to the existing pressure.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Description : ________________ is one which has a temperature lower than the saturation temperature corresponding to the existing pressure.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Last Answer : Sub cooled Liquid

The gas in a constant gas thermometer cooled to absolute zero would have _________.  a. no volume  b. no pressure  c. zero temperature at all scales  d. none of the above

Description : The gas in a constant gas thermometer cooled to absolute zero would have _________.  a. no volume  b. no pressure  c. zero temperature at all scales  d. none of the above

Last Answer : no pressure

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs? (A) Enthalpy (B) Relative humidity (C) Wet bulb temperature (D) Dew point temperature

Description : Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs? (A) Enthalpy (B) Relative humidity (C) Wet bulb temperature (D) Dew point temperature

Last Answer : (D) Dew point temperature

Pick out the wrong statement (A) A horizontal line on the humidity chart indicates the temperature changes at constant molal humidity (B) When water is cooled from 80 to 70°C by exposure to the air with a wet bulb temperature of 60°C, then both the approach & the range would be 10°C (C) For unsaturated air-water vapor mixture at atmospheric conditions, the wet bulb temperature & adiabatic cooling lines are the same (D) Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

Description : Pick out the wrong statement (A) A horizontal line on the humidity chart indicates the temperature changes at constant molal humidity (B) When water is cooled from 80 to 70°C by exposure ... & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

Last Answer : (D) Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

The temperature at which the vapor pressure exactly equals one atm is called _________.  a. boiling temperature  b. normal boiling point  c. triple point  d. point of infliction

Description : The temperature at which the vapor pressure exactly equals one atm is called _________.  a. boiling temperature  b. normal boiling point  c. triple point  d. point of infliction

Last Answer : normal boiling point

______________ is the temperature at which liquids start to boil or the temperature at which vapors begin to condense.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Description : ______________ is the temperature at which liquids start to boil or the temperature at which vapors begin to condense.  a. Saturation Temperature  b. Sub cooled Liquid  c. Compressed Liquid  d. Saturated Liquid

Last Answer : Saturation Temperature

Also called absolute humidity and specific humidity.  a. Related humidity  b. Humidity ratio  c. Dew point  d. Adiabatic ratio

Description : Also called absolute humidity and specific humidity.  a. Related humidity  b. Humidity ratio  c. Dew point  d. Adiabatic ratio

Last Answer : Humidity ratio

Dew point of an air-water vapor mixture (A) Decreases with decrease in pressure (B) At constant humidity & total pressure is fixed (C) Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve (D) All 'a', 'b' & 'c'

Description : Dew point of an air-water vapor mixture (A) Decreases with decrease in pressure (B) At constant humidity & total pressure is fixed (C) Corresponding to any point on the humidity chart is obtained by projecting a ... to the temperature axis and to the saturation curve (D) All 'a', 'b' & 'c'

Last Answer : (D) All 'a', 'b' & 'c'

The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then (A) Wet bulb temperature=dry bulb temperature (B) Wet bulb temperature=dew point temperature (C) Saturation temperature=dew point temperature (D) All 'a', 'b' & 'c

Description : The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then (A) Wet bulb temperature=dry bulb temperature (B) ... temperature (C) Saturation temperature=dew point temperature (D) All 'a', 'b' & 'c

Last Answer : Option D

Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled (A) And humidified (B) And dehumidified with increase in wet bulb temperature (C) At the same relative humidity (D) And dehumidified with decrease in wet bulb temperature

Description : Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled (A) And ... (C) At the same relative humidity (D) And dehumidified with decrease in wet bulb temperature

Last Answer : (D) And dehumidified with decrease in wet bulb temperature

_________is the partial pressure of water vapor at the existing temperature divided by the equilibrium vapor pressure of water at the existing temperature.  a. vacuum pressure  b. relative humidity  c. absolute pressure  d. vapor pressure

Description : _________is the partial pressure of water vapor at the existing temperature divided by the equilibrium vapor pressure of water at the existing temperature.  a. vacuum pressure  b. relative humidity  c. absolute pressure  d. vapor pressure

Last Answer : relative humidity

Ten cu ft. of air at 300 psia 400°F is cooled to 140°F at constant volume. What is the final pressure? (formula: p2 = p1T2/T1)  a. 0  b. 209 psia  c. - 420 psia  d. None of the above

Description : Ten cu ft. of air at 300 psia 400°F is cooled to 140°F at constant volume. What is the final pressure? (formula: p2 = p1T2/T1)  a. 0  b. 209 psia  c. - 420 psia  d. None of the above

Last Answer : 209 psia

What refers to the state at which liquid and gaseous phases are indistinguishable?  a. Triple point  b. Critical point  c. Boiling point  d. Pour point

Description : What refers to the state at which liquid and gaseous phases are indistinguishable?  a. Triple point  b. Critical point  c. Boiling point  d. Pour point

Last Answer : Critical point

What is the unique state at which solid, liquid and gaseous phase can go co-exist in equilibrium?  a. Triple point  b. Critical point  c. Boiling point  d. Pour point

Description : What is the unique state at which solid, liquid and gaseous phase can go co-exist in equilibrium?  a. Triple point  b. Critical point  c. Boiling point  d. Pour point

Last Answer : Triple point

What refers to the point at which the saturated liquid and saturated vapor states are the same or identical?  A. Triple point  B. Inflection point  C. Maximum point  D. Critical point

Description : What refers to the point at which the saturated liquid and saturated vapor states are the same or identical?  A. Triple point  B. Inflection point  C. Maximum point  D. Critical point

Last Answer : Maximum point

In thermodynamics, a throttling process, also called a _________, is a type of isenthalpic process where a liquid or gas is cooled as it passes from a higher pressure state to a lower pressure state.  a. Rankine Process  b. Carnot Cycle  c. Joule-Thomson process  d. Refrigeration process

Description : In thermodynamics, a throttling process, also called a _________, is a type of isenthalpic process where a liquid or gas is cooled as it passes from a higher pressure state to a lower pressure state.  a. Rankine Process  b. Carnot Cycle  c. Joule-Thomson process  d. Refrigeration process

Last Answer : Joule-Thomson process

The compressibility factor, x, is used for predicting the behavior of nonideal gases. How is the compressibility ty factor defined relative to an ideal gas? (subscript “c”refers to critical value)  A. z = P / Pc  B. z = pV/ RT  C. z = T /Tc  D. z = RT / pV Hint: for an real gases the compressibility factor, x, is an dimensionless constant given by pV=zRT. Therefore z = pV / RT

Description : The compressibility factor, x, is used for predicting the behavior of nonideal gases. How is the compressibility ty factor defined relative to an ideal gas? (subscript c refers to critical value)  A. ... compressibility factor, x, is an dimensionless constant given by pV=zRT. Therefore z = pV / RT

Last Answer : z = pV/ RT

Ten cu. ft of air at 300psia and 400°F is cooled to 140°F at constant volume. What is the transferred heat?  a.-120Btu  b. -220Btu  c.-320Btu  d. -420Btu formula: Q= mcv(T2-T1)

Description : Ten cu. ft of air at 300psia and 400°F is cooled to 140°F at constant volume. What is the transferred heat?  a.-120Btu  b. -220Btu  c.-320Btu  d. -420Btu formula: Q= mcv(T2-T1)

Last Answer : -420Btu

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air. (A) Wet bulb (B) Dry bulb (C) Saturation (D) Dew point

Description : Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air. (A) Wet bulb (B) Dry bulb (C) Saturation (D) Dew point

Last Answer : Option A

The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature. (A) Dew point (B) Wet bulb (C) Dry bulb (D) None of these

Description : The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature. (A) Dew point (B) Wet bulb (C) Dry bulb (D) None of these

Last Answer : (D) None of these

What refers to a liquid whose temperature is lower than saturation temperature corresponding to the existing pressure?  a. Subcooled liquid  b. Saturated liquid  c. Pure liquid  d. Compressed liquid

Description : What refers to a liquid whose temperature is lower than saturation temperature corresponding to the existing pressure?  a. Subcooled liquid  b. Saturated liquid  c. Pure liquid  d. Compressed liquid

Last Answer : Subcooled liquid

__________________ is a vapor having a temperature higher than the saturation temperature corresponding to the existing pressure.  a) Vapor  b) Saturated Vapor  c) Superheated Vapor  d) Wet Vapor

Description : __________________ is a vapor having a temperature higher than the saturation temperature corresponding to the existing pressure.  a) Vapor  b) Saturated Vapor  c) Superheated Vapor  d) Wet Vapor

Last Answer : Superheated Vapor

___________________ is a vapor at the saturation conditions (saturation temperature and saturation pressure).  a) Vapor  b) Saturated Vapor  c) Superheated Vapor  d) Wet Vapor

Description : ___________________ is a vapor at the saturation conditions (saturation temperature and saturation pressure).  a) Vapor  b) Saturated Vapor  c) Superheated Vapor  d) Wet Vapor

Last Answer : Saturated Vapor

What refers to the pressure at which a pure substance changes phase at a given temperature?  A. Equilibrium pressure  B. Saturation pressure  C. Superheated pressure  D. Subcooled pressure

Description : What refers to the pressure at which a pure substance changes phase at a given temperature?  A. Equilibrium pressure  B. Saturation pressure  C. Superheated pressure  D. Subcooled pressure

Last Answer : Saturation pressure

What refers to the temperature at which a pure substance changes phase at a given pressure?  A. Equilibrium temperature  B. Saturation temperature  C. Superheated temperature  D. Subcooled temperature

Description : What refers to the temperature at which a pure substance changes phase at a given pressure?  A. Equilibrium temperature  B. Saturation temperature  C. Superheated temperature  D. Subcooled temperature

Last Answer : Saturation temperature

The door of a running refrigerator inside a room was left open. Which of the following statements is correct?  (a) The room will be cooled to the temperature inside the refrigerator.  (b) The room will be cooled very slightly.  (c) The room will be gradually warmed up.  (d) The temperature of the air in room will remain unaffected.  (e) any one of above is possible depending on the capacity.

Description : The door of a running refrigerator inside a room was left open. Which of the following statements is correct?  (a) The room will be cooled to the temperature inside the refrigerator.  (b) The room ... air in room will remain unaffected.  (e) any one of above is possible depending on the capacity.

Last Answer : Answer : c

During sensible heating of humid air (A) Relative humidity increases (B) Dew point remains constant (C) Dry bulb & wet bulb temperature increases (D) Both 'b' & 'c'

Description : During sensible heating of humid air (A) Relative humidity increases (B) Dew point remains constant (C) Dry bulb & wet bulb temperature increases (D) Both 'b' & 'c'

Last Answer : (D) Both 'b' & 'c'

What temperature scale is identical to the Kelvin scale?  A. Ideal gas temperature scale  B. Ideal temperature scale  C. Absolute gas temperature scale  D. Triple point temperature scale

Description : What temperature scale is identical to the Kelvin scale?  A. Ideal gas temperature scale  B. Ideal temperature scale  C. Absolute gas temperature scale  D. Triple point temperature scale

Last Answer : Ideal gas temperature scale

What is the temperature when water and vapor are in equilibrium with the atmospheric pressure?  a. Ice point  b. Steam point  c. Critical point  d. Freezing point

Description : What is the temperature when water and vapor are in equilibrium with the atmospheric pressure?  a. Ice point  b. Steam point  c. Critical point  d. Freezing point

Last Answer : Steam point

What is the temperature when water and vapor are in the equilibrium with the atmospheric pressure?  a. Ice point  b. Steam point  c. Critical point  d. Freezing point

Description : What is the temperature when water and vapor are in the equilibrium with the atmospheric pressure?  a. Ice point  b. Steam point  c. Critical point  d. Freezing point

Last Answer : Steam point

__________________ represents the highest pressure and highest temperature at which liquid and vapor can coexist in equilibrium.  a) Critical Point  b) Boiling Point  c) Quality Point  d) None of the above

Description : __________________ represents the highest pressure and highest temperature at which liquid and vapor can coexist in equilibrium.  a) Critical Point  b) Boiling Point  c) Quality Point  d) None of the above

Last Answer : Critical Point

Compressed air coming out from a punctured football  (a) becomes hotter  (b) becomes cooler1  (c) remains at the same temperature  (d) may become hotter or cooler depend-ing upon the humidity of the surround¬ing air  (e) attains atmospheric temperature.

Description : Compressed air coming out from a punctured football  (a) becomes hotter  (b) becomes cooler1  (c) remains at the same temperature  (d) may become hotter or cooler depend-ing upon the humidity of the surround¬ing air  (e) attains atmospheric temperature.

Last Answer : (b) becomes cooler1

Dry-bulb temperature is: a. The absolute temperature corresponding to the atmospheric pressure b. The same as the wet-bulb temperature if the relative humidity is less than 100% c. Not required to find the relative humidity d. The temperature of the air measured with an ordinary thermometer e. The dew point temperature

Description : Dry-bulb temperature is: a. The absolute temperature corresponding to the atmospheric pressure b. The same as the wet-bulb temperature if the relative humidity is less than 100% c. Not required ... d. The temperature of the air measured with an ordinary thermometer e. The dew point temperature

Last Answer : Answer: D

Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known? (A) Dew point (B) Humidity ratio (C) Wet bulb temperature (D) None of these

Description : Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known? (A) Dew point (B) Humidity ratio (C) Wet bulb temperature (D) None of these

Last Answer : (C) Wet bulb temperature

What law predicts the dew point of moisture in the fuel gas?  A. Dalton’s law  B. Law of Dulong and Petit  C. Ringelman law  D. Amagat’s law

Description : What law predicts the dew point of moisture in the fuel gas?  A. Dalton’s law  B. Law of Dulong and Petit  C. Ringelman law  D. Amagat’s law

Last Answer : Dalton’s law

Mixture of liquid and steam of the same substance in which both are at saturation temperature.  a. dry steam  b. current steam  c. wet steam  d. aerosol

Description : Mixture of liquid and steam of the same substance in which both are at saturation temperature.  a. dry steam  b. current steam  c. wet steam  d. aerosol

Last Answer : wet steam

The most efficient cycle that can operate between two constant temperature reservoir is the _________.  a. Otto Cycle  b. Lazare Cycle  c. Isothermal Cycle  d. Carnot Cycle

Description : The most efficient cycle that can operate between two constant temperature reservoir is the _________.  a. Otto Cycle  b. Lazare Cycle  c. Isothermal Cycle  d. Carnot Cycle

Last Answer : Carnot Cycle

The volume of a given amount of water _________ as the temperature decreases from 4˚C to 0˚C.  a. decreases  b. increases  c. remains constant  d. none of the above

Description : The volume of a given amount of water _________ as the temperature decreases from 4˚C to 0˚C.  a. decreases  b. increases  c. remains constant  d. none of the above

Last Answer : increases

The flow through an open system is _________ if all properties at each point within the system remain constant with respect to time.  a. streamline flow  b. steady flow  c. constant flow  d. algebraic flow

Description : The flow through an open system is _________ if all properties at each point within the system remain constant with respect to time.  a. streamline flow  b. steady flow  c. constant flow  d. algebraic flow

Last Answer : steady flow

In order to use a substance to make a thermometer the substance must _________ with a temperature change.  a. expand  b. contract  c. change  d. increase

Description : In order to use a substance to make a thermometer the substance must _________ with a temperature change.  a. expand  b. contract  c. change  d. increase

Last Answer : change

What is the state at which all three phases of water coexist in equilibrium?  A. Tripoint of water  B. Triple point of water  C. Triple phase point of water  D. Phase point of water

Description : What is the state at which all three phases of water coexist in equilibrium?  A. Tripoint of water  B. Triple point of water  C. Triple phase point of water  D. Phase point of water

Last Answer : Triple point of water

With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature). (A) Increases (B) Remains unchanged (C) Decreases (D) Decreases linearly

Description : With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature). (A) Increases (B) Remains unchanged (C) Decreases (D) Decreases linearly

Last Answer : (A) Increases