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You Are On Multi Choice Question Bank SET 1428

71401. During a refrigeration cycle, heat is rejected by the refrigerant in a





71402. A refrigeration system





71403. The subcooling in a refrigeration cycle





71404. Which of the following is a non-ferrous metal?





71405. During sensible cooling of air __________ decreases.





71406. The critical radius is the insulation radius at which the resistance to heat flow is





71407. In case of solids, the heat transfer takes place according to radiation.



71408. A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.



71409. The relative humidity decreases as air gets wet.



71410. The temperature of ammonia after compression in a vapour compression system is





71411. The centrifugal compressors are generally used for refrigerants that require





71412. The water, alcohol and ammonia have same refrigerating effect at different altitudes.



71413. The automobile radiator is a heat exchanger of





71414. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.



71415. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be





71416. The curved lines on a psychrometric chart indicates





71417. During humidification process, __________ increases.





71418. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be





71419. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.



71420. The freon group of refrigerants are





71421. For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is __________ that for counter flow.




71422. A vapour absorption refrigerator uses __________ as a refrigerant.





71423. Thermal conductivity of air increases with rise in temperature.



71424. The material of pipe lines for a system using ammonia as a refrigerant should be copper.



71425. The wave length corresponding to the maximum energy is inversely proportional to the absolute temperature. This statement is called Planck's law.



71426. Which of the following refrigerant has the highest freezing point.





71427. Air conditioning means





71428. The emissivity for a black body is





71429. Which of the following would lead to a reduction in thermal resistance?





71430. The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to





71431. Free convection flow depends on





71432. The critical pressure of a liquid is the pressure





71433. Conduction is a process of heat transfer





71434. Thermal diffusivity of a substance is





71435. Chemical name of chalk is?





71436. Fouling factor is used





71437. The natural convection air cooled condensers are used in





71438. The process, generally used in winter air-conditioning to warm and humidity the air, is called





71439. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.



71440. Bell-Coleman cycle is a





71441. Sulphur dioxide is extremely toxic and non-flammable.



71442. The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.



71443. A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as


71444. Which tax is levied and collected by the Union but wholly assigned to the states?





71445. Which of the following statement is correct for ammonia as a refrigerant?





71446. The wet bulb temperature at 100% relative humidity is __________ dew point temperature.




71447. The use of heat exchangers is made in





71448. In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in





71449. Reflection of infrared rays emitted by earth by atmosphere causes?





71450. The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.



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