Refrigeration Machine Operator Exam
Test Guide Questions and Answers
The pump best suited to pump heavy viscous liquids is - Answer-A rotary pump
Which type of pump produces the greatest suction? - Answer-a positive displacement
pump
reciprocating pumps:
1) are high pressure pumps
2) must be primed
3) use mechanical seals
4) should be started with the suction and discharge open - Answer-1 and 4
a volute type pump - Answer-Has a progressively expanding spiral casing.
a diffuser pump
1) has stationary guide vanes surrounding the impeller
2) has a higher efficiency than a volute type
3) has high suction lift
4) does not have to be primed - Answer-1 and 2
Turbine pumps are best suited for
1) are high capacity pumps
2) are high pressure pumps
3) have the liquid gain energy in a number of impulses
4) are low maintenance pumps - Answer-2 and 3
another name for a lantern ring used in pumps is - Answer-seal cage
gear and piston pumps would be under the category of - Answer-positive displacement
the number of discharge valves on a two cylinder double acting pump will be - Answer-4
a sliding vane pump is termed - Answer-a rotary pump
when starting up a reciprocating pump - Answer-the discharge valve should be open
the purpose of "wear rings" in centrifugal pumps is to - Answer-increase the efficiency
Pump Priming - Answer-is done with the suction valve open
sealed bearings on pumps require greasing - Answer-none of the above
Test Guide Questions and Answers
The pump best suited to pump heavy viscous liquids is - Answer-A rotary pump
Which type of pump produces the greatest suction? - Answer-a positive displacement
pump
reciprocating pumps:
1) are high pressure pumps
2) must be primed
3) use mechanical seals
4) should be started with the suction and discharge open - Answer-1 and 4
a volute type pump - Answer-Has a progressively expanding spiral casing.
a diffuser pump
1) has stationary guide vanes surrounding the impeller
2) has a higher efficiency than a volute type
3) has high suction lift
4) does not have to be primed - Answer-1 and 2
Turbine pumps are best suited for
1) are high capacity pumps
2) are high pressure pumps
3) have the liquid gain energy in a number of impulses
4) are low maintenance pumps - Answer-2 and 3
another name for a lantern ring used in pumps is - Answer-seal cage
gear and piston pumps would be under the category of - Answer-positive displacement
the number of discharge valves on a two cylinder double acting pump will be - Answer-4
a sliding vane pump is termed - Answer-a rotary pump
when starting up a reciprocating pump - Answer-the discharge valve should be open
the purpose of "wear rings" in centrifugal pumps is to - Answer-increase the efficiency
Pump Priming - Answer-is done with the suction valve open
sealed bearings on pumps require greasing - Answer-none of the above
