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

USCG General Subjects (Auxiliaries & Systems) (Set 9)

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Question 1 of 30

If all of the air charge has been lost from a ship service air receiver, the compressor mechanical unloading system will __________.

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30 MCQs

#1 If all of the air charge has been lost from a ship service air receiver, the compressor mechanical unloading system will __________. #2 Over pressurization of an air compressor intercooler is prevented by the __________. #3 The air charge leaving an intercooler, or after cooler of an air compressor can be expected to be __________. #4 Which of the following compressors on a motor ship would most likely operate at approximately 100 psig? #5 If an air compressor is fitted with a hand-off-auto (H-O-A) control station, what statement concerning operation is true? #6 If the drive belts on an air compressor were squealing during startup, you should __________. #7 If one drive belt on an air compressor is found to be worn you should __________. #8 The main bearings of a reciprocating air compressor are tapered roller bearings. When mounted, these bearings are given a 'cold' end clearance to __________. #9 After disassembly, the safest way to remove carbon deposits from air compressor inlet and discharge valves is to use __________. #10 How often should the air receivers on a compressed air system be drained of moisture and emulsions? #11 When checking the oil level on a reciprocating air compressor fitted with a dipstick, under what conditions should the oil level be checked? #12 As an indication that an air compressor air intake filter needs to be replaced or cleaned, what statement is true? #13 Which of the following statements represents the proper procedural sequence for adjusting the metering rate of an in-line lubricator as used in a ship's service air system hose station? Assume that the pressure regulator has been properly set. #14 Which of the following statements represents the proper criteria to decide when to drain a filter/moisture separator as used in a ship's service air system hose station? #15 In a twin-tower desiccant type air dryer using silica gel as an adsorbing agent, what is the procedure for rejuvenating the tower presently on service when the desiccant becomes saturated with moisture? #16 Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by __________. #17 Operating a reciprocating air compressor without an air filter will cause __________. #18 Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve? #19 Which of the following causes would most likely result in excessively high belt-driven reciprocating air compressor drive motor running current draw? #20 If a reciprocating air compressor was operating at a compression ratio that exceeded its design parameters, what would be the effect? #21 If a belt-driven reciprocating air compressor is operating at a lower than design displacement capacity (in cubic feet per minute), which of the following would be a cause? #22 If a reciprocating air compressor has cylinder suction or discharge valves that fail to properly seat, what statement is true concerning the result? #23 What statement is true concerning carbon deposit formation on reciprocating compressor cylinder valves? #24 As shown in figure "B" of the illustrated block diagram of a central operating system configured for supervisory control, which statement is true concerning the block "COMPUTER" with respect to closed-loop control processes? Illustration EL-0094 #25 As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the units labeled "ROS" which are remote operating system workstations? Illustration EL-0096 #26 What type of temperature transmitter would be most suitable for measuring running gear bearing temperatures in a diesel engine in that it requires no contact with the bearing? #27 What type of temperature transmitter would be most suitable for measuring diesel engine exhaust and boiler stack temperatures and generates its own electromotive force? #28 What is another name for the control mode used in a process control system that uses two-point control? #29 In a closed-loop process control system, what term is used to describe the action of measuring the difference between the actual result and the desired result and using that difference to drive the actual result toward the desired result? #30 In a closed-loop process control system, what statement concerning feedback is true as it relates to stability and the direction of error displacement?

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