21. The discharge ________ in the fuel ejection system could ensure that the residual
pressure is maintained in the high-pressure fuel line between injections.
(A) needle valve
(B) check valve
(C) stop valve
(D) safety valve
31. Which type of response will be excited for a shafting system if the frequency of a vibratory
load is equal to a natural frequency of the connected structure or equipment of this shafting
system?
(A) Resonant response
(B) Static response
(C) External response
(D) Transmitting response
32. A device which is installed in a diesel engine with an attempt 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 that of air at atmospheric pressure. This
device is called:
(A) Blower
(B) Elevator
(C) Crankshaft
(D) Turbocharger
37. What is the volume above the piston in a cylinder when the piston is located at BDC?
(A) Bottom volume
(B) Compression volume
(C) Top volume
(D) Cylinder volume