Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG General Subjects (Auxiliaries & Systems) (Set 6)

30:00

|

Question 1 of 30

Question Navigator

Correct Incorrect Pending Starred

Question 1 of 30

You suspect a problem with the centrifugal fire pump on your ship, and begin to slowly close the discharge valve. Your suspicion is confirmed when the __________.

Browse Questions in Set 6

30 MCQs

#1 You suspect a problem with the centrifugal fire pump on your ship, and begin to slowly close the discharge valve. Your suspicion is confirmed when the __________. #2 A centrifugal pump may fail to deliver water when first started if the __________. #3 Charring or glazing of the inner circumference of the packing rings in a centrifugal pump is caused by __________. #4 The three basic parts of any eductor are the nozzle, the suction chamber, and the __________. #5 A distinguishing feature of an eductor, when compared to other pumps, is the __________. #6 One disadvantage of using a mechanical shaft seal instead of mechanical packing is that __________. #7 When installing a mechanical shaft seal on a pump, it is important to ______. #8 Which of the listed types of seals is used effectively for pumps handling toxic or highly flammable liquids that cannot be permitted to escape into the atmosphere? #9 Which of the following statements is true regarding mechanical seals? #10 Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? #11 Mechanical shaft seals used on water service pumps require lubrication of the seal faces to minimize deposits of foreign matter on those surfaces. Which of the following pressures and lubricants are required? #12 Which of the following statements represents the main difference between a stuffing box gland and a mechanical seal for sealing the shaft of a centrifugal pump? #13 Which of the pumping systems listed for use aboard ship will most likely use a propeller type pump? #14 One of the main differences between a propeller pump and a centrifugal pump is the absence of a __________. #15 Which type of pump would normally be used to transfer fairly large quantities of fluids at relatively low pressures? #16 Which of the following is NOT an identifiable characteristic of a steam reciprocating pump? #17 Which of the following valve arrangements permits the reciprocating pump liquid piston to take suction from the suction chamber, and simultaneously discharge through the discharge chamber during the up and down strokes? #18 Which of the listed reciprocating pump parts control the position of the pilot slide valve? #19 The suction-force principle of operation is a typical characteristic of __________. #20 The total length of stroke in a reciprocating steam pump can be adjusted by __________. #21 When securing a steam reciprocating pump, which of the valves listed should remain open? #22 When the danger of freezing exists, all steam driven reciprocating pumps and deck equipment should be __________. #23 When a reciprocating pump is operating at maximum speed, the cushioning valves should be __________. #24 When repacking a reciprocating pump with more than four rings of packing, the packing is cut square, installed with the ends abutted, and each succeeding ring staggered with the butted ends __________. #25 To safely remove the piston rod packing from the steam end of a reciprocating pump, you should __________. #26 Which of the listed types of steam end piston rod packing should be used in a steam reciprocating pump? #27 Which of the lubricants listed is the best to use on a reciprocating pump rod? #28 The first step when resetting the slide valves on a duplex reciprocating pump is to __________. #29 Excessive lost motion in the valve mechanism of a duplex reciprocating pump will cause the __________. #30 An inadequate reciprocating bilge pump discharge is most often caused by __________.

Question Discussion & Notes

0

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...