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You Are On Multi Choice Question Bank SET 1429

71451. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.



71452. During cooling and dehumidification, dry bulb temperature




71453. The coefficient of performance of electrolux refrigerator is the ratio of





71454. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.



71455. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.



71456. The conditioned air supplied to the room must have the capacity to take up





71457. The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.



71458. The specific humidity during dehumidification process




71459. Which of the following refrigerant has the lowest freezing point?





71460. For a white body, absorptivity (α ) = 0, reflectivity (ρ) = 1 and transmittivity (τ) = 0.



71461. Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?





71462. Who was elected as the first temporary president of the constitutent assembly?





71463. According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.



71464. In electrolux refrigerator





71465. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be





71466. A boot-strap air cooling system has





71467. The boiling point of __________ is -10.5°C.





71468. One tonne of refrigeration (1TR) means that the heat removing capacity is





71469. The operating pressure for refrigerating units using R-12 as a refrigerant is





71470. The specific humidity during heating and humidification process.




71471. The superheated vapour region, in a pressure enthalpy chart, is represented by the space





71472. The minimum temperature to which water can be cooled in a cooling tower is





71473. The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as





71474. The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to





71475. The alignment circle is marked on the psychrometric chart at





71476. The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.




71477. Who among the following was not one of the revolutionaries abroad who added a new dimenĀ­sion to our struggle for freedom?





71478. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be





71479. If a gas is to be liquified, its temperature must be





71480. The thermostatic expansion valve is used in __________ type of evaporators.




71481. According to Prevost's theory of exchanges, every body irrespective of its temperature continuously emit heat radiations to the surrounding bodies and at the same time receives heat radiations from the surrounding bodies.



71482. In a boot-strap air evaporative cooling system, the evaporator is provided





71483. According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the





71484. A good refrigerant should have





71485. The thermal diffusivity for gases is generally __________ those for liquids.




71486. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is





71487. The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.



71488. In case of liquids and gases, the heat transfer takes place according to





71489. The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)


71490. The radiation emitted by a black body is known as





71491. The sensible heat during humidification process decreases.



71492. According to Newton's law of cooling, the heat transfer from a hot body to a cold body is





71493. The freezing point of carbon dioxide is equal to boiling point of R-12.



71494. The condition of refrigerant as it leaves the compressor in a vapour compression system is





71495. The super-heating in a refrigeration cycle





71496. Thermal conductivity of a material may be defined as the





71497. During sensible heating of air, specific humidity remains constant.



71498. Air refrigeration cycle is used in





71499. The part I of the constitution deals with?





71500. The wet bulb depression is zero when relative humidity is





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