| 1. | For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is ? | |
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reciprocating
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rotating
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centrifugal
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screw
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Report Question| 2. | The pressure at the inlet of a refrigerant compressor is called ? | |
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suction pressure
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discharge pressure
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critical pressure
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back pressure
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| 3. | Carbon dioxide is ? | |
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colourless
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odourless
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non-flammable
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all of these
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| 4. | Which of the following refrigerant has the lowest freezing point ? | |
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R-11
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R-12
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R-22
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Ammonia
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| 5. | In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the ? | |
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Reynold's number
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Grashoff's number
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Reynold's number, Grashoff's number
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Prandtl number, Grashoff's number
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| 6. | Radiation is the process of heat transfer in which heat flows from ........... in a straight line, without affecting the intervening medium ? | |
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cold body to hot body
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hot body to cold body
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smaller body to larger body
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larger body to smaller body
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| 7. | The heat transfer takes place according to ? | |
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Zeroth law of thermodynamics
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First law of thermodynamics
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Second law of thermodynamics
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Kirchhoff's law
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| 8. | Which of the following statement is correct for ammonia as a refrigerant ? | |
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It is toxic to mucous membranes
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it requires large displacement per TR compared to fluoro carbons
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It reacts with copper and its alloys
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all of these
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| 9. | A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be ? | |
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lack of cooling water
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water temperature being high
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dirty condenser surface
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all of these
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| 10. | The pressure at the outlet of a refrigerant compressor is called ? | |
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suction pressure
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discharge pressure
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critical pressure
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back pressure
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