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7 Cards in this Set
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Which of the below is the compressor responsible for doing? 1. Maintains a high pressure in the condenser 2. Maintains a low pressure in the evaporator 3. Raises the pressure of the refrigerant 1) 1, 3 2) 2, 3 3) 3 4) 1 5) 1, 2, 3 |
1, 2, 3 |
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In rotating mechanical seals, the sealing ring is held in position by: 1) A nut bolt and washer 2) Centrifugal force 3) A spring 4) High pressure refrigerant vapour 5) Oil suction |
A spring |
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The compression ratio of a refrigeration compressor can be calculated by: 1) Dividing the absolute inlet pressure by the absolute discharge pressure 2) Dividing the inlet pressure by the discharge pressure 3) Dividing the discharge pressure by the inlet pressure 4) Dividing the absolute discharge pressure by the absolute inlet pressure 5) Dividing the absolute discharge pressure by the inlet pressure |
Dividing the absolute discharge pressure by the absolute inlet pressure |
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The three main classifications of refrigeration compressors are: 1. Reciprocating 2. Axial 3. Centrifugal 4. Rotary 5. Turbo 1) 1, 3, 4 2) 1, 3, 5 3) 3, 4, 5 4) 1, 2, 3 5) 2, 3, 4 |
1) 1, 3, 4 |
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Rotary compressors have several different designs, some of which are: 1. Sliding vane 2. Rotary lobe 3. Helical rotor 4. Rotating impeller 5. Reciprocating piston 1) 3, 4, 5 2) 2, 3, 4 3) 1, 3, 5 4) 1, 3, 4 5) 1, 2, 3 |
5) 1, 2, 3 |
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A typical stationary crankshaft seal consisting of a metallic bellows soldered at one end to a ring (seal nose) which bears either against a shoulder on the shaft or against a seal ring on the shaft is called a: 1) Packing gland seal 2) Rotating Mechanical seal 3) Diaphragm seal 4) Set screw 5) Bellows seal |
Bellows seal |
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For a Helical Rotor Design rotary compressor, which of the following statements is true? 1) The cylinders around the rotor screws must be considerably larger in diameter than the screws 2) The compressor consists of three opposing grooved rotors 3) The driving rotor has helical lobes and the driven rotor has flutes 4) All of the above 5) The vapour is drawn in via the closed space between the driving rotor and the casing |
The driving rotor has helical lobes and the driven rotor has flutes |
