Stationary Engineer Exam #4: Answers to 100% Correct Questions, Exams of Engineering

Download Stationary Engineer Exam #4: Answers to 100% Correct Questions and more Exams Engineering in PDF only on Docsity! Stationary Engineer's Exam #4 Questions With 100% Correct Answers 2024 Absolute zero is - Correct Answer--460 F The mechanical equivalent of heat is - Correct Answer-778 BTUs The failure of a brick furnace lining is called - Correct Answer- Spalling The amount of heat required to change the state of a substance is called - Correct Answer-Latent The section of solid plate between tube holes is called a - Correct Answer-Ligament The external covering of a boiler is called - Correct Answer- Lagging The instrument used to test flue gases for proper combustion is a - Correct Answer-ORSAT The test used to determine the amount of dissolved oxygen in water is the _________ Test - Correct Answer-Winkler Air being compressed by a two-stage aircompressor can be cooled by the use of a - Correct Answer-intercooler A ___________ pump requires no air chamber on the discharge line. - Correct Answer-centrifugal The device used to regulate the amount of refrigerant to the evaporator is the - Correct Answer-expansion valve ________ Is used to protect the compressor of a refrigeration system from slugs of liquid refrigerant. - Correct Answer-False head The temperature of the water used for a hydrostatic test should be - Correct Answer-70 Degrees or above An electric boiler generates 34.5 lbs. of steam per hour for every 10 kilowatt hour. True or False - Correct Answer-True The temperature differential between the Coil and the ammonia in the pipes of an ammonia compression system is - Correct Answer-10 Degrees F. Springs used in safety valves shall not show a permanent set exceeding - Correct Answer-1 percent of their free length, 10 minutes after being released by a cold compression test closing the spring solid. A short piece of pipe, the thread external on both ends is a - Correct Answer-Nipple In a centrifugal pump, water is displaced by means of a - Correct Answer-impeller The draft over a fire in a steam boiler is usually expressed as - Correct Answer-the negative pressure in inches of water Atomization of fuel oil in a horizontal rotary cup oil burner is primarily due to - Correct Answer-The rotating cup and primary air A hydrostatic test of a boiler should be conducted at a test pressure of - Correct Answer-1 - 1/2 times the safe working pressure Number 6, or bunker fuel oil, used in a mechanical pressure atomizing burner should be preferably heated to - Correct Answer-200 Degrees The air gap on a A.C. induction motor is the space between the - Correct Answer-rotor and the stator Hartford loops are only used on boilers with a - Correct Answer-Gravity return system If an old cast iron heating boiler carried no pressure stamp, what would be the highest steam and not water pressure you could legally use on this boiler in New York State? - Correct Answer-15 PSI Steam and 15 PSI Water One type of flame detector used in a boiler is the rectifying phototube type. This detector operates by sensing - Correct Answer-visible light If a Fahrenheit thermometer registers -40 degrees, what would be the reading on a Centigrade scale. - Correct Answer- C = (F-32) / 1.8 C = (-40 - 32) /1.8 C = -40 Degrees An electrical motor draws 50 amperes at 220 volts. What horsepower is delivered at the pulley of the motor if the efficiency is 90% - Correct Answer-11,000 watts / 746 watts per hp = 14.74hp 14.74 hp x 90% = 13.27 Hard scale in a boiler is produced by - Correct Answer-Calcium sulfate the chemical symbol for ammonia is - Correct Answer-NH3 What is a volt - Correct Answer-Electromotive force or the pressure of an electrical circuit What is a ohm - Correct Answer-resistance or opposition to current flow a Kilowatt is equal to how many horsepower? - Correct Answer-1000 watts / 746 Watts per hp = 1.34 hp what is a kilowatt-hour - Correct Answer-1000 watts for a one hour duration Is used to shield the shaft - Correct Answer-Sleeve The actual part of the pump that pumps - Correct Answer- Impeller Pump rotates, but output decreases - Correct Answer-slippage Prevent pump priming - Correct Answer-Vacuum breaker Special material used around the shaft of a pump - Correct Answer-packing Used to prime a pump - Correct Answer-Foot valve Prevents shaft wear - Correct Answer-Bearing Prevents air leakage into pump - Correct Answer-Latern Rings Controls pump output volume - Correct Answer-Discharge valves Direction of the pump movement - Correct Answer-Rotation List the 5 types of riveted joints in order of least secure to most secure - Correct Answer-Single lap, Double lap, double butt & strap, Triple butt & strap, Quadruple butt & strap