Mechanical Engineering MCQs

Page No. 141

The leaks in a refrigeration system using Freon are detected by____________________?


ahalide torch which on detection produces greenish flame lighting


bsulphur sticks which on detection gives white smoke


cusing reagents


dsmelling



On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process ________________?


ainvolves no change in volume


btakes place at constant temperature


ctakes place at constant enthalpy


dtakes place at constant pressure



In vapour compression cycle using NH3 as refrigerant, initial charge is filled at_________________?


asuction of compressor


bdelivery of compressor


chigh pressure side close to receiver


dlow pressure side near receiver



Freon group of refrigerants are___________________?


ainflammable


btoxic


cnon-inflammable and toxic


dnon-toxic and non-inflammable



The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents_____________________?


acondensation of the refrigerant vapour


bevaporation of the refrigerant liquid


ccompression of the refrigerant vapour


dmetering of the refrigerant liquid



In a refrigeration cycle, the flow of refrigerant is controlled by___________________?


acompressor


bcondenser


cevaporator


dexpansion valve


View Answer expansion valve

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_________________?


a0.2


b1.2


c5


d6


View Answer 6

Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?


acompression


bdirect


cindirect


dabsorption


View Answer absorption

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_________________?


a1.25


b0.8


c0.5


d0.25


View Answer 0.25

In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?


acondenser and expansion valve


bcompressor and evaporator


cexpansion valve and evaporator


dcompressor and condenser



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