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রেফ্রিজারেশন এন্ড এয়ারকন্ডিশনিং MCQ
105. যখন অ্যাবজরতিটি (∝) = 0, রিফ্লেকটিভিটি (p) = 1 এবং ট্রান্সমিটিভিটি (γ) = 0, তখন বস্তুটিকে কী বলা হবে?
কালো বস্তু
ধূসর বস্তু
ওপেক বস্তু
সাদা বস্তু
108. One ton of the refrigeration is-
the standard unit used in refrigeration problems
the cooling effect produced by melting 1 ton of ice
the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C.in 24 hours
the refrigeration effect to produce 1 ton of ice at NTP conditions
110. Choose the correct statement:
A refrigerant should have low latent heat
If operating temperature of system is low, then refrigerant with low boiling point should be used
Precooling and subcooling of refrigerant are same
Superheat and sensible heat of refrigerant are same
111. The coefficient of performance is the ratio of the refrigerant effect to the –
heat of compression
work done by compressor
enthalpy increase in compressor
all of the above
115. For proper refrigeration in a cabinet, if the temperature and vapour pressure differenc between cabinet and atmosphere is high then-
bigger cabinet should be used
smaller cabinet should be used
perfectly tight vapour seal should be used
refrigerant with lower evaporation tempera should be used
116. The advantage of dry compression is that-
it permits higher speeds to be used
it permits complete evaporation in the evaporator
it results in high volumetire and mechanical efficiency
all of the above