Lakshya Education MCQs

  1. Topics
  2. Mechanical Engineering
  3. Refrigeration And Air Conditioning Mcqs
Question: A refrigerating system operating on reversed brayton refrigeration cycle is used for maintaining 250 k. if the temperature at the end of constant pressure cooling is 300 k and rise in the temperature of air in the refrigerator is 50 k, then the net work of compression will be (assume air as working substance with cp = 1 kj/kg)
Options:
A. 25 kJ/kg
B. 50 kJ/kg
C. 100 kJ/kg
D. 125 kJ/kg
Answer: Option B
Explanation :

Previous Next

Submit Answer & Explaination

Earn Reward Points by submitting Detailed Explaination for this Question

More Questions on This Topic :

Question 1. The relative humidity is defined as
  1.     The mass of water vapour present in 1 m3 of dry air
  2.     The mass of water vapour present in 1 kg of dry air
  3.     The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure
  4.     The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
Answer: Option D
Explanation :
Question 2. The relative humidity is defined as
  1.     The mass of water vapour present in 1 m3 of dry air
  2.     The mass of water vapour present in 1 kg of dry air
  3.     The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure
  4.     The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
Answer: Option D
Explanation :
Question 3. The dry bulb temperature during sensible heating of air
  1.     Remains constant
  2.     Increases
  3.     Decreases
  4.     None of these
Answer: Option B
Explanation :
Question 4. Moisture in freon refrigeration system causes
  1.     Ineffective refrigeration
  2.     High power consumption
  3.     Freezing automatic regulating valve
  4.     Corrosion of whole system
Answer: Option C
Explanation :
Question 5. The wet bulb temperature during sensible cooling of air
  1.     Remains constant
  2.     Increases
  3.     Decreases
  4.     None of these
Answer: Option C
Explanation :
Question 6. The dry bulb temperature during sensible heating of air
  1.     Remains constant
  2.     Increases
  3.     Decreases
  4.     None of these
Answer: Option B
Explanation :

Check all Questions in this Topic : Click HERE

Recent Questions

Q. What Kind Of An Exception Will Be Thrown If The String To Pa....Q. The Second Most Senior Office In The Country Is Of-....Q. What Is The Ratio Of The Matches Played By Either Denmark Or....Q. Why Do We Need To Treat Factory Wastes Before They Are Allow....Q. Match List-I With List-II And Select The Correct Answer Usin....Q. How Many Watt-hours Represent 65 W Used For 18 H?....Q. If A Company Sells A Car With A Marked Price Of Rs. 272000 A....Q. My Doctor Knew That I Would Eventually Recover And Do Kind O....Q. The Lathe Spindles Are Usually Made Hollow And Provided With....Q. The Units Of Moment Of Inertia Of An Area Are....Q. The Systems Have Been Classified In Different Ways....Q. Which Of The Following Is Not A Factor To Consider When Swit....Q. When The Nature Of Contact Between The Elements Of A Pair Is....Q. An Empty Fuel Tank Of A Car Was Filled With A Type Petrol. W....Q. A Programmable Controller:....Q. The Parameter Which Completely Defines The Chip Formation In....Q.  the Average Of Four Positive Integers Is 69. The Highest I....Q. The Angle Of Elevation Of The Top Of A Tower At A Point On T....Q. A Compound Key....Q. If A2 + B2 + C2 + 3 = 2(a + B + C) Then The Value Of (a + B ....