R & AC RK1

Pick up the wrong statement. A refrigerant Should have

• Low specific heat of liquid
• high boiling point
• high latent heat of vaporisation
• higher critical temperature

A standard ice point temperature corresponds to the temperature of

• Water at 0°C
• Ice at -4°C
• Solid and dry ice
• Mixture of ice and water under equilibrium conditions

Vapour compression refrigeration is some what Like

• Carnot cycle
• Ranking cycle
• Reversed Carnot cycle
• None of the above

Which of the following cycles uses air as the Refrigerant

• Ericsson
• Stirling
• Carnot
• Bell-coleman

Ammonia-absorption refrigeration cycle requires

• Very little work input
• Maximum work input
• Nearly same work input as for vapour compression cycle
• Zero work input

An important characteristics of absorption System of refrigeration is

• Noisy operation
• Quiet operation
• Cooling below 0°C
• Very little power consumption

The refrigerant for a refrigerator should have

• High sensible heat
• High total heat
• High latent heat
• Low sensible heat

The work Requirement for ammonia absorption refrigeration cycle is low because

• ammonia has high thermal conductivity
• ammonia has high latent heat
• pumping process involves vapour
• pumping process involves liquid

The following type of expansion device is utilised in flooded evaporator

• motor operated valve
• self-actuated expansion valve
• capillary tube
• float valve

The Cop of a domestic refrigerator

• less than 1
• is more than 1
• is equal to 1
• depends upon the make