63
Spring 2014 Proceedings
www.uscg.mil/proceedings
Prepared by NMC Engineering
Examination Team
Nautical
Engineering
Queries
Nautical
Engineering
Queries
1. During the initial cooling down of a box temperature in a refrigeration system, which of the devices listed is used
to prevent excessive gas pressure at the compressor suction?
A. Suction pressure hold-back valve
B. High pressure cutout
C. Solenoid valve
D. Low pressure cutout
2. The function of a centrifugal pump double volute casing is to .
A. reduce radial thrust on the impeller
B. double the liquid velocity through the pump when compared to a single volute
C. reduce the hydraulic end thrust
D. provide the effect of multi-staging
3. When a hydraulic valve lifter is on the base circle of the cam, 'zero' valve lash is maintained by the .
A. valve spring
B. plunger spring
C. oil pressure
D. rocker arm
Q
uestions
Spring2014_26.indd 63 3/26/14 2:07 PM