Explore topic-wise MCQs in Refrigeration and Air conditioning.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Refrigeration and Air conditioning knowledge and support exam preparation. Choose a topic below to get started.

1.

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?

A. 2 and 3
B. 1 and 2
C. 1 and 3
D. 2 and 4
Answer» B. 1 and 2
Discussion
2.

In a mixture of dry air and water vapor at a total pressure of 750 mm of Hg, the partial pressure of water vapor is 20 mm of Hg. The humidity ratio of the air in grams of water vapor per kg of dry air (gw/kgda) is ________

A. 10 gw/Kgda
B. 17 gw/Kgda
C. 27 gw/Kgda
D. 25 gw/Kgda
Answer» C. 27 gw/Kgda
Discussion
3.

In an ideal vapour compression refrigeration cycle, the specific enthalpy of refrigerant (in kJ/kg) at the following states is given as : Inlet of condenser : 283 Exit of condenser : 116 Exit of evaporator : 232 The COP of this cycle is

A. 2.27
B. 2.75
C. 3.27
D. 3.75
Answer» B. 2.75
Discussion
4.

List-I A. Liquid to suction heat exchange B. Constant volume heat addition C. Normal shock D. Ammonia-water List-II 1. Vapour absorption refrigeration 2. Vapour compression refrigeration 3. Diesel cycle 4. Otto cycle 5. Converging nozzle 6. Converging diverging nozzle

A. A 2, B 4, C 6, D 1
B. A 5, B 4, C 6, D 1
C. A 2, B 4, C 5, D 1
D. A 2, B 4, C 6, D 5
Answer» B. A 5, B 4, C 6, D 1
Discussion
5.

A refrigerator uses R134a as its refrigerant and operates on a ideal vapour-compression refrigeration cycle between 0.14 MPa and 0.8 MPa. If the mass flow rate of the refrigerant is 0.05 kg/s, the rate of heat rejection to the environment is _______ kW. Given data: At P = 0.14 MPa, h = 236.04 kJ/kg , s = 0.9322 kJ/kgK At P = 0.8 MPa, h = 272.05 kJ/kg (superheated vapour) At P = 0.8 MPa, h = 93.42 kJ/kg (saturated liquid)

A. 8.931 kW
B. 89.31 kW
C. 9.831 kW
D. 9.813 kw
Answer» B. 89.31 kW
Discussion