MCQ ~ Air Refrigeration Cycles

1. One tonne of refrigeration is equal to

• 21 KJ/min
• 210 KJ/min
• 420 KJ/min
• 620 KJ/min

2. One tonne of refrigerating machine means that,

• One tonne is the total mass of the machine
• One tonne of refrigerant is used
• One tonne of water can be converted into ice.
• One tonne of ice when melts from and at 0^oC in 24 hours, the refrigerating effect produced is equivalent to 210 KJ/min

3. The coefficient of performance is always ........... one.

• Equal to
• Less than
• Greater than

4. In a closed or dense air refrigeration cycle, the operating pressure ratio can be reduced, which results in ............ coefficient of performance.

• Lower
• Higher

5. Air refrigeration cycle is used in

• Commercial refrigerators
• Domestic refrigerators
• Air conditioning
• Gas liquefaction

6. In a refrigerating machine, heat rejected is ............ heat absorbed.

• Equal to
  
• Less than
• Greater than

7. Air refrigerator works on

• Carnot cycle
  
• Rankine cycle
• Reversed Carnot cycle
• Bell-Coleman cycle
• Both Carnot & Rankine cycle
• Both Reversed Carnot cycle & Bell-Coleman cycle.

8. In air conditioning of aeroplanes, using air as refrigerant, the cycle used is

• Reversed Carnot cycle
• Reversed Joule cycle
• Reversed Brayton cycle
• Reversed Otto cycle