Ammonia is __________________?

Related Mcqs:

1. The boiling point of ammonia is___________________?

   A. -100°C
   B. -50°C
   C. – 33.3°C
   D. 0°C
   E. 33.3°C

2. Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?

   A. atmospheric pressure
   B. slightly above atmospheric pressure
   C. 2-4 bars
   D. 5-6 bars
   E. 7-10 bars

3. Ammonia-absorption refrigeration cycle requires__________________?

   A. very little work input
   B. maximum work input
   C. nearly same work input as for vapour compression cycle
   D. zero work input
   E. none of the above

4. 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

5. The evolution of heat of solution takes place in ammonia absorption plant when _____________________?

   A. ammonia vapour goes into solution
   B. ammonia vapour is driven out of solution
   C. lithium bromide mixes with ammonia
   D. weak solution mixes with strong solution
   E. lithium bromide is driven out of solution

6. Cooling water is required for following equipment in ammonia absorption plant__________________?

   A. condenser
   B. evaporator
   C. absorber
   D. condenser and absorber
   E. condenser, absorber and separator (rectifier)

7. Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?

   A. strong solution to weak solution
   B. weak solution to strong solution
   C. strong solution to ammonia vapour
   D. ammonia vapour to weak solution
   E. ammonia vapour to strong solution

8. Super heating in a refrigeration cycle __________________?

   A. increases COP
   B. decreases COP
   C. COP remains unaltered
   D. other factors decide COP
   E. unpredictable

9. In vapour compression cycle the condition of refrigerant is superheated vapour _____________________?

   A. after passing through the condenser
   B. before passing through the condenser
   C. after passing through the expansion or throttle valve
   D. before [entering the expansion valve
   E. before entering the compressor

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

    A. suction of compressor
    B. delivery of compressor
    C. high pressure side close to receiver
    D. low pressure side near receiver
    E. anywhere in the cycle