Refrigeration operator level 1 Exam Questions and Answers 100% Pass |Verified & Updated|ACTUAL

Refrigeration operator level 1 Exam Questions and Answers 100% Pass |Verified & Updated|ACTUAL The definition of latent heat is - ANSWER -Causes a substance to change state (solid-liquid, liquid-gas, or solid-gas) True or false: with the exception of water, all liquids expand in direct proportion to their change in temperature when heated - ANSWER -False Three modes of heat transfer are: - ANSWER -conduction, convection, radiation Which of the following is NOT a type of heat exchanger - ANSWER -Rippled When heat flows from molecule to molecule within a substance, or between bodies that are in direct contact, the method of heat transfer is called: - ANSWER -Conduction The transfer of heat involving the movement of a fluid is defined as - ANSWER convection Convert -6°C to °F. - ANSWER -21.2°F When the temperature of an object is increased, its change in length is proportional to its - ANSWER -Initial length and temperature increase. 1 psi equals - ANSWER -6.89 kPa The change of position (in meters) per unit time is - ANSWER -velocity What is the force of gravity exerted on an object having a mass of 5 tonnes? - ANSWER -49,050 N The ability of a body to do work due to its motion is called _____ energy - ANSWER -kinetic Any action on a body that tends to change its size, shape or state of motion is defined as: - ANSWER -force The product, 'm x g x h' will result in the _____ energy of an object - ANSWER Potential If a body travels 850m in 34 seconds, what will its average velocity be, in km/h - ANSWER -90 An object has a mass of 95kg is at a height of 36m above the ground. What is the potential energy? - ANSWER -33.55 kJ One newton is equal to - ANSWER -1 kg m/s^2 The unit of measure for energy in the SI system is the - ANSWER -Joule How much work is done by a pump with a 0.1m diameter piston, travelling 250mm against a pressure of 1500kPa - ANSWER -2.95 kJ A pump raises 650 tonnes of sea water a height of 55 m in 6 hours. If the pump efficiency is 100% what is the power required to drive the pump? - ANSWER -16.24 kW The second law of thermodynamics states that in order to transfer heat from a colder substance to a hotter substance, _______ must be supplied - ANSWER External work When the temperature of an object is raised, its increase in surface area is proportional to its - ANSWER -initial area and temperature rise The temperature at which all molecular motion is said to completely cease is - ANSWER -0 K According to ASME BPVC Section VII, heat exchangers and similar vessels shall be protected with - ANSWER -pressure relief device ________ heat exchangers are not usually used with steam, because condensate does not easily drain from them - ANSWER -Plate type The most vital element to ensure effective heat transfer in a fin-type heat exchanger coil - ANSWER -A good bond must exist between the tube and the fin Most boiler tubes are ____________ heat exchangers. - ANSWER -bare pipe Which of the following is not a physical property of refrigerants - ANSWER Corrosiveness The rate a refrigeration system removes heat from the refrigerated medium is defined as - ANSWER -The refrigeration capacity In a refrigeration system, the liquid refrigerant is changed to a gas in the - ANSWER -Evaporator The saturation temperature of a refrigerant is the same as its - ANSWER -boiling point R-134a - ANSWER -Is non toxic In a closed vessel, the boiling point of a liquid can be raised by - ANSWER Raising the pressure in the vessel When a liquid evaporates, it: - ANSWER -Gains latent heat Which of the following is an example of loss of latent heat - ANSWER -Steam condenses The ideal refrigerant should - ANSWER -Have a low ozone depleting potential and a low global warming potential The safety head of a refrigeration compressor is designed to - ANSWER -Relieve pressure due to liquid in the cylinder Which of the following statements about the shell and tube evaporator is false - ANSWER -In a direct expansion chiller, the brine circulates through the tubes. Which of the following is not a component of a closed cycle compression refrigeration system - ANSWER -Absorber