What is the purpose of wearing rings on a centrifugal pump?
a. Prevents fluid leakage
b. Increases compression ratio
c. Improves pumping efficiency
d. Prolongs bearing life
c. Improves pumping efficiency
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An underwater sonar detects the echo from an object at 100m range. The TOF equals ___ ( x.xx s).
Fill in the blank(s) with the appropriate word(s).
When the Soviet Union attempted to install nuclear weapons in Cuba, President Kennedy ordered
A. the installation of nuclear weapons in Turkey. B. surgical air strikes against the missile sites. C. a ground invasion of Cuba naval landing at Guantanamo Bay. D. an aerial bombing of all of Cuba. E. a naval quarantine of that island.
How is the water flow in a hydronic heating system checked?
A) By measuring the pressure drop across the water pump and comparing it to a pumping performance chart B) By measuring the pump motor RPM using a digital tachometer C) By measuring the amp draw of the pump motor and applying the formula gp = amps × 1.73 D) By measuring the impeller RPM using a stroboscope
Every spark plug has a specified ____________________ that indicates how fast heat can travel away from the spark plug center electrode into the water jackets in the cylinder head.
Fill in the blank(s) with the appropriate word(s).