A. halide torch which on detection produces greenish flame lighting
B. sulphur sticks which on detection gives white smoke
C. using reagents
D. smelling
E. sensing reduction in pressure
Related Mcqs:
- Moisture in freon refrigeration system causes________________?
A. ineffective refrigeration
B. high power consumption
C. freezing automatic regulating valve
D. corrosion of whole system
E. breakdown of refrigerant - Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of___________________?
A. 1 : 1
B. 1 : 9
C. 9 : 1
D. 1 : 3
E. 3 : 1 - One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice_________________?
A. in 1 hour
B. in 1 minute
C. in 24 hours
D. in 12 hours
E. in 10 hours - Freon group of refrigerants are___________________?
A. inflammable
D. toxic
C. non-inflammable and toxic
D. non-toxic and inflammable
E. non-toxic and non-inflammable - Air refrigeration cycle is used in ____________________?
A. domestic refrigerators
B. commercial refrigerators
C. air conditioning
D. gas liquefaction
E. such a cycle does not exist - The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?
A. increase
B. decrease
C. remain unaffected
D. may increase or decrease depending on the type of refrigerant used
E. unpredictable - Most of the domestic refrigerators work on the following refrigeration system _________________?
A. vapour compression
B. vapour absorption
C. carnot cycle
D. electrolux refrigerator
E. dual cycle - Under-cooling in a refrigeration cycle_________________?
A. increases COP
B. decreases COF
C. COP remains unaltered
D. other factors decide COP
E. unperdictable - One ton of the refrigeration is_________________?
A. the standard unit used in refrigeration problems
B. the cooling effect produced by melting 1 ton of ice
C. the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
D. the refrigeration effect to produce 1 ton of ice at NTP conditions
E. the refrigeration effect to produce 1 ton of ice in 1 hour time - Highest temperature encountered in refrigeration cycle should be________________?
A. near critical temperature of refrigerant
B. above critical temperature
C. at critica. temperature
D. much below critical temperature
E. could be anywhere
