RAC Lab
Q1. What is the use of a flash chamber in VCR system?
a. To increase pressure
b. To decrease pressure
c. To evaporate refrigerant partially
d. To separate vapour and liquid refrigerant
Q2. Which of the following will be the value of Refrigeration effect if m2 = 2 kg/min, m3 = 0.8 kg/min and enthalpies for the refrigerant at saturated vapour and saturated liquid line are 1420 and 1260 kJ/kg?
a. 192
b. 196
c. 194
d. 129
Q3. What is the ratio of the mass of refrigerant supplied to evaporator and mass of refrigerant circulating through condenser i.e., m1 / m2?
a. h1 – h2 / h1 – h4
b. h2 – h1 / h4 – h1
c. h1 – h4 / h1 – hf4'
d. h1 – hf4' / h1 – h4
Q4. What is the use of accumulator or pre-cooler in VCR system?
c. To supply dry saturated vapour and pure liquid refrigerant to the respective equipment
d. To condense refrigerant partially
Q5. After which process during the VCR cycle, the highest temperature is achieved?
a. Evaporation
b. Compression
c. Condensation
d. Expansion
