Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Subjects (Auxiliaries & Systems) (Set 14)
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Question 1 of 30
Of the following propulsion modes, which one would operate with a geared-drive featuring a double reduction?
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30 MCQs #1 Of the following propulsion modes, which one would operate with a geared-drive featuring a double reduction? #2 The basic function of the centrifugal pump impeller is to __________. #3 The primary function of a centrifugal pump volute is to __________. #4 Which of the following statements is true concerning centrifugal pumps? #5 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? #6 Which of the listed parts is used in a lobe-type rotary pump to allow for wear on the lobe edges? #7 One disadvantage of using a mechanical shaft seal instead of mechanical packing is that __________. #8 The output volume of a positive fixed displacement pump can be changed only by __________. #9 What should be done if localized scoring is discovered on a pump shaft sleeve during routine maintenance inspection? #10 When repacking a stuffing box fitted with a lantern ring, which of the following precautions should be observed? #11 When installing a mechanical shaft seal on a pump, it is important to ______. #12 A centrifugal pump gradually develops insufficient discharge pressure. What corrective action is required? #13 A pump shaft that is bent or distorted should normally be __________. #14 When renewing spiral packing in a centrifugal pump stuffing box, after the packing is firmly seated, the packing gland nuts should be __________. #15 The capacity of a gear type rotary pump, when operated at a constant speed, will decrease with an increase in the pump __________. #16 Why is the discharge pressure of a herringbone gear pump steadier than the discharge pressure of a simple spur gear pump? #17 How does the viscosity of a fluid being pumped affect the operation of a spur gear pump? #18 Positive displacement, helical gear pumps are well suited for pumping oil because __________. #19 The pressure of a liquid leaving the pump can be referred to as the __________. #20 If the existing vapor pressure is subtracted from the indicated pressure at the pump suction, the remainder is the __________. #21 A pump is defined as a device that __________. #22 Which of the following terms is used to identify the pressure of a liquid entering a centrifugal pump? #23 Water leaking from a pump packing gland is kept away from the bearing housing by the use of __________. #24 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? #25 Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? #26 Which of the pumping systems listed for use aboard ship will most likely use a propeller type pump? #27 The suction-force principle of operation is a typical characteristic of __________. #28 If you have a duplex, single acting, reciprocating pump making 140 strokes/minute with a 3" diameter cylinder, and a 12" stroke with a 94% volumetric efficiency, what is the capacity of this pump? #29 To safely remove the piston rod packing from the steam end of a reciprocating pump, you should __________. #30 Which of the lubricants listed is the best to use on a reciprocating pump rod?
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