OSV-Assistant Engineer Q652 General Subjects

Question 1

Which term represents the ability of a speed control governor to maintain prime mover speed without hunting?

Answer 1

Stability

Question 2

Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant charge? Illustration GS-RA-45

Answer 2

C

Question 3

Suppose the pressure switch used to control the “lead” potable water pump is set at 45 psig cut-in for pump start and 55 psig cut-out for pump stop. What would be an appropriate setting for the “lag” potable water pump?

Answer 3

40 psig cut-in for pump start and 55 psig cut-out for pump stop.

Question 4

What statement is true with regard to the basic operating principle of gravity associated with an oily- water separator?

Answer 4

The density of oil is less than that of water and as a result the oil droplets in an oily-water mixture will tend to rise.

Question 5

In the illustrated pneumatically operated, diaphragm actuated control valve, what statement is true concerning the opening and closing forces acting upon the control diaphragm? Illustration GS-0051

Answer 5

The spring force acting on the control diaphragm is a valve opening force, and the pilot pressure acting on the top of the control diaphragm is a valve closing force.

Question 6

Under what conditions is it permissible to pump machinery space bilges directly overboard without processing by an oily-water separator?

Answer 6

When presented with a flooding emergency.

Question 7

The device illustrated would be best used as a __________. Illustration GS-0058

Answer 7

variable or constant speed motor

Question 8

Under which of the listed conditions can the engine room retake the throttle control from the bridge of an automated vessel?

Answer 8

Any time it is deemed necessary.

Question 9

On a bearing using an oiling ring as means of static oil feed, unless adverse conditions would indicate otherwise, how often should the oil be completely changed at a minimum?

Answer 9

Annually

Question 10

Concerning steerable internal duct thrusters, what statement is true?

Answer 10

The thrust direction of the steerable internal duct thruster is determined by the orientation of the water discharge vectoring ring.

Question 11

An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of __________.

Answer 11

aeration of the oil

Question 12

What type of propeller consists of a flat disc set flush with the under surface of the vessel’s hull with a number of vertical, rudder like blades projecting from it?

Answer 12

Cycloidal propeller