33. Which pump is consisted of a vaned impeller mounted on a shaft that rotates within a
casing?
(A) Gear pump
(B) Centrifugal pump
(C) Injector
(D) Reciprocating pump
5. What kind of pumps is applying the action of piston to force the liquid?
(A) Screw pumps
(B) Gear pumps
(C) Reciprocating pump
(D) Centrifugal pumps
26. The principal reason for turbocharging is to increase the power output of an engine of
given size and speed, by enabling the cylinders to be charged with air at an elevated pressure
and, therefore, at a higher density than air at atmospheric pressure. What is the main purpose to
use a turbocharger?
(A) To elevate the density of air in order to decrease the pressure in cylinder.
(B) To elevate the pressure of air in order to decrease the density in cylinder.
(C) To improve the power output of an engine of given size and speed by increasing the
compressed air intake temperature.
(D) To improve the power output of an engine of given size and speed by increasing the density of
charged air.
27. The minimum temperature to which the exhaust gas is cooled is also a limitation since, in
order to avoid what in the cold end of the boiler and stack, the temperature should not be allowed
to drop below the acid dew point?
(A) fatigue
(B) thermal fatigue
(C) creeping
(D) corrosion
14. The energy per unit mass of a fuel is often quantified by the heating value of the fuel. The
heating values of the residual fuels are typically ________ % lower than the distillates.
(A) 5~7
(B) 8~10
(C) 11~13
(D) 14~16