MCQ
2161. Highest temperature refrigeration cycle should be encountered In near critical temperature of refrigerant--
above critical temperature
at critical temperature
much below critical temperature
none
2162. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is-
less than 2kg
more than or equal to 3.65kg
more than 10kg
there is no such consideration
2163. For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condemer must be-
small
equal
high
anything
2164. The higher temperature in compression cycle occurs at-
receiver
expansion valve
evaporator
compressor discharge
2165. Which of the following is not the intensive property?
Pressure
Temperature
Density
Heat
2166. Which of the following cycles uses air as the refrigerant?
Ericsson
Carmot
Stirling
Bell-coleman
2167. The bank of tubes at the back of domestic refrigerator are-
condenser tubes
evaporator tubes
refrigerant cooling tubes
capillary tubes
2168. Ammonia-absorption refrigeration cycle requires--
very litle work input
maximum work, input
nearly same work input as for vapour
compression cycle zero work input
2169. Air refrigeration operates on—
Carnot cycle
Rankine cycle
Reversed Carnot cycle
Brayton cycle
2170. Refrigeration in aeroplanes usually employs the following refrigerant-
Freon-11
Air
Freon-22
Ammonia
2171. Which of the following quantities is not the property of the system?
Pressure
Temperature
Specific volume
Heat
2172. Which of the following is the extensive property of a themodynamic system?
Pressure
Volume
Temperature
Density
2173. Vapour compression refrigeration is some what like-.
Camot cycle
Rankine cycle
reversed Canet cycle
none of the above
2174. Absorption system normally uses the following refrigerant-
Freon-11
ammonia
Freon-22
CO
2175. The term N.T.P. stands for-
Nominal temperature and pressure
Natural temperature and pressure
Normal temperature and pressure
Normal thermodynamic practice
2176. Heat and work are-
Point functions
System properties
Path functions
Intensive properties
2177. The relative coefficient of performance is-
actual COP/theoretical COP
theoretical COP/actual COP
actual COP x theoretical COP
1-actual COP x theoretical COP
2178. One of the purposes of subcooling the liquid refrigerant is to-
reduce compressor overheating
reduce compressor discharge temperature
increase cooling effect
ensure that only liquid and not the vapour enters the expansion (throttling) valve
2179. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device-
electrically operated throttling valve
manually operated valve
thermostatic valve
capillary tube
2180. Presence of moisture in a refrigerant affects the working of--
compressor
condemer
evaporator
expansion valve