6.6. Which possible reason will not make centrifugal pumps to failure to build up pressure?
(A) The water has high temperature
(B) There is air in the water
(C) The speed of motor is too slow
(D) The impeller may be damaged or wearing rings worn, or some other mechanical defect
9.9. When a diesel engine started and run by fuel, the charge air delivered by the turbocharger
flows through _______________ after that going into the scavenging air receiver.
(A) air cooler and water separator
(B) air cooler and air inlet valveo
(C) air cooler and air bottle
(D) air cooler and air distributor
10.10. The sulphur is troublesome due to its potential for _____________ and acid contamination
of the lubricating oil.
(A) ignition delay
(B) cold-end corrosion
(C) late combustion
(D) difficulty burning
19.19. The strainers should be installed with ______________ that provide the pre-warning of the
necessity for cleaning the strainer.
(B) level indicators
(C) pressure drop indicators
(D) flow meters
20.20. The main function of equipment is adjusting pressure, temperature and flow of fluid. What
equipment is above description?
(A) Relief valve
(B) Regulating valve
(C) Reducing valve
(D) Needle valve