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**181. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to:**
– **A. collect liquid refrigerant and prevent it from going to compressor**
– B. detect liquid in vapour
– C. superheat the vapour
– D. collect vapours
– E. increase refrigeration effect

**182. Accumulators should have adequate volume to store refrigerant charge at least:**
– A. 10%
– B. 25%
– **C. 50%**
– D. 75%
– E. 100%

**183. A refrigeration cycle operates between condenser temperature of +27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be:**
– A. 0.2
– B. 1.2
– **C. 5**
– D. 6
– E. 10

**184. In vapor compression refrigeration system, refrigerant occurs as liquid between:**
– **A. condenser and expansion valve**
– B. compressor and evaporator
– C. expansion valve and evaporator
– D. compressor and condenser
– E. none of the above

**185. Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle:**
– **A. 1.25**
– B. 0.8
– C. 0.5
– D. 0.25
– E. none of the above

**186. Aqua ammonia is used as refrigerant in the following type of refrigeration system:**
– A. compression
– B. direct
– C. indirect
– **D. absorption**
– E. none of the above

**187. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be:**
– A. 0.2
– B. 1.2
– **C. 5**
– D. 6
– E. 10

**188. In a refrigeration cycle, the flow of refrigerant is controlled by:**
– A. compressor
– B. condenser
– C. evaporator
– **D. expansion valve**
– E. all of the above

**189. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents:**
– A. condensation of the refrigerant vapour
– **B. evaporation of the refrigerant liquid**
– C. compression of the refrigerant vapour
– D. metering of the refrigerant liquid
– E. none of the above

**190. Freon group of refrigerants are:**
– A. inflammable
– B. toxic
– C. non-inflammable and toxic
– D. non-toxic and inflammable
– **E. non-toxic and non-inflammable**