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Past Year Questions: Psychrometric Process - Mechanical Engineering MCQ


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10 Questions MCQ Test Additional Study Material for Mechanical Engineering - Past Year Questions: Psychrometric Process

Past Year Questions: Psychrometric Process for Mechanical Engineering 2024 is part of Additional Study Material for Mechanical Engineering preparation. The Past Year Questions: Psychrometric Process questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Past Year Questions: Psychrometric Process MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Past Year Questions: Psychrometric Process below.
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Past Year Questions: Psychrometric Process - Question 1

Wet bulb depression, under saturated ambient air conditions:

[1989]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 1

WBD = 0 for saturated air
∴ DBT = WBT

Past Year Questions: Psychrometric Process - Question 2

During the Chemical dehumidification process of air

[1999]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 2

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Past Year Questions: Psychrometric Process - Question 3

Water at 42°C is sprayed into a stream of air at atmospheric pressure, dry bulb temperature of 40ºC and a wet bulb temperature of 20°C. The air leaving the spray humidifier is not saturated. Which of the following statements is true?

[2005]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 3

Here, tDBT = 40°, tWBT = 20°
Water sprayed at temperature = 42°
Since, twater spray > tDBT  so heating and humidification.

Past Year Questions: Psychrometric Process - Question 4

Various psychrometric processes are shown in the figure below.
Process in Figure
P. 0-1
Q. 0-2
R. 0-3
S. 0-4
T. 0-5

Name of the process
(i) Chemical dehumidification
(ii) Sensible heating
(iii) Cooling and dehumidification
(iv) Humidification with steam injection
(v) Humidification with water injection


The matching pair are

[2005]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 4


Past Year Questions: Psychrometric Process - Question 5

Dew point temperature is the temperature at which condensation begins when the air is cooled at constant

[2006]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 5


Air is cooled at constant pressure to make unsaturated air to saturated one.

Past Year Questions: Psychrometric Process - Question 6

The statements concern psychrometric chart.
1. Constant relative humidity lines are uphill straight lines to the right.
2. Constant wet bulb temperature lines are downhill straight lines to the right.
3. Constant specific volume lines are downhill straight lines to the right.
4. Constant enthalpy lines are coincident with constant wet bulb temperature lines.
Which of the statements are correct?

[2006]

Past Year Questions: Psychrometric Process - Question 7

Atmospheric air at a flow rate of 3 kg/s (on dry basis) enters a cooling and dehumidifying coil with an enthalpy of 85 kJ/kg of dry air and a humidity ratio of 19 grams/kg of dry air. The air leaves the coil with an enthalpy of 43 kJ/kg of dry air and a humidity ratio of 8 grams/kg of dry air. If the condensate water leaves the coil with an enthalpy of 67 kJ/kg, the required cooling capacity of the coil in kW is

[2007]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 7

Mass flow rate of condensate,
 mw = ma (w1 - w2 ) = 3 x (.019 - .008) = .033 kg/s
By applying energy balance equation we get

3×85 = 3×43 + 0.033×67 + Q
Q = 123.8 kW

Past Year Questions: Psychrometric Process - Question 8

Air (at atmospheric pressure) at a dry bulb temperature of 40°C and wet bulb temperature of 20°C is humidified in an air washer operating with continuous water recirculation. The wet bulb depression, the difference between the dry and wet bulb temperatures) at the exit is 25% of that at the inlet. The dry bulb temperature at the exit of the air washer is closest to

[2008]

Past Year Questions: Psychrometric Process - Question 9

Moist air at 35°C and 100% relative humidity is entering a psychrometric device and leaving at 25°C and 100% relative humidity. The name of the device is

[2014]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 9


Since water content in moist air is reducing. The device is dehumidifer.

Past Year Questions: Psychrometric Process - Question 10

If a mass of moist air contained in a closed metallic vessel is heated, then its

[2017]

Detailed Solution for Past Year Questions: Psychrometric Process - Question 10

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