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1st Class Stationary Engineer's Examination #4 Questions and Answers
Typology: Exams
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Absolute zero is - Answer- -460 F The mechanical equivalent of heat is - Answer- 778 BTUs The failure of a brick furnace lining is called - Answer- Spalling The amount of heat required to change the state of a substance is called - Answer- Latent The section of solid plate between tube holes is called a - Answer- Ligament The external covering of a boiler is called - Answer- Lagging The instrument used to test flue gases for proper combustion is a - Answer- ORSAT The test used to determine the amount of dissolved oxygen in water is the _________ Test - Answer- Winkler Air being compressed by a two-stage aircompressor can be cooled by the use of a - Answer- intercooler A ___________ pump requires no air chamber on the discharge line. - Answer- centrifugal The device used to regulate the amount of refrigerant to the evaporator is the - Answer- expansion valve ________ Is used to protect the compressor of a refrigeration system from slugs of liquid refrigerant. - Answer- False head The temperature of the water used for a hydrostatic test should be - Answer- 70 Degrees or above When a boiler is "Laid-up" by the wet method, the PH of the water should be maintained in the range of - Answer- 10 to 12
is a device used to measure very high temperature - Answer- pyrometer firetubes are fastened to the tube sheet by - Answer- expanding or rolling The point at which the air becomes saturated is called the - Answer- Dew point To remove oil from a boiler you should use - Answer- Caustic soda One electrical horsepower is equal to - Answer- 746 watts The deep guttering or lines of pits in piping caused by dissolved gases is called - Answer- Grooving Smoke can be detected by means of a - Answer- photoelectrical cell this tube is used for steam gauges - Answer- bourdon tube A pump will not handle hot water from below the pump level, but.... - Answer- it will pump hot water supplied from above it The New York State Boiler code requires all low pressure steam boilers to be - Answer- equipped with a low water cut-off The suction pressure of a refrigeration system is directly proportional to the - Answer- horsepower per ton of refrigeration Dry boiler storage is better than - Answer- wet boiler storage Using kerosene to clean an air compressor is considered - Answer- a bad practice An electric boiler generates 34.5 lbs. of steam per hour for every 10 kilowatt hour. True or False - Answer- True The temperature differential between the Coil and the ammonia in the pipes of an ammonia compression system is - Answer- 10 Degrees F. Springs used in safety valves shall not show a permanent set exceeding - 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 - Answer- Nipple In a centrifugal pump, water is displaced by means of a - Answer- impeller The draft over a fire in a steam boiler is usually expressed as - Answer- the negative pressure in inches of water
Atomization of fuel oil in a horizontal rotary cup oil burner is primarily due to - Answer- The rotating cup and primary air A hydrostatic test of a boiler should be conducted at a test pressure of - Answer- 1 - 1/ times the safe working pressure Number 6, or bunker fuel oil, used in a mechanical pressure atomizing burner should be preferably heated to - Answer- 200 Degrees The air gap on a A.C. induction motor is the space between the - Answer- rotor and the stator Hartford loops are only used on boilers with a - 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? - 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 - Answer- visible light If a Fahrenheit thermometer registers -40 degrees, what would be the reading on a Centigrade scale. - Answer- C = (F-32) / 1. C = (-40 - 32) /1. 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% - Answer- 11,000 watts / 746 watts per hp = 14.74hp 14.74 hp x 90% = 13. Hard scale in a boiler is produced by - Answer- Calcium sulfate the chemical symbol for ammonia is - Answer- NH The blow down ring on a safety valve is used to - Answer- govern the amount of steam exhausted The initials N.B. stamped on a boiler would have to do with its - Answer- ASME Code The only valve permitted by law between the boiler and the main stop valve is - Answer- non-return valve The City of Buffalo Ordinances require a First Class Stationary Engineer for a boiler or battery of boilers more than - Answer- 100 HP / 225 HP
When a steam boiler is to be laid-up for a long period of time, it is recommended that the dry method be used. In this method, the boiler is sealed after first placing inside the boiler - Answer- Trays of unslated lime The element in fuel oil that produces the greatest amount of heat is - Answer- Carbon What do the poles of an AC Generator require before they furnish current? - Answer- Excitation of the poles What is residual magnetism? - Answer- LEFT OVER MAGNETISM IN THE METAL PARTS OF SUCH ITEMS AS SOLENOIDS AND TRANSFORMERS. How does a motor differ from a generator - Answer- a motor receives electrical energy and turns it into mechanical energy and a generator receives mechanical energy and turns it into electrical energy. What is a transformer? - Answer- a device which takes in A.C voltage and raises or lowers the voltage depending on weather it is a step up or a stepdown transformer. What is the difference between a voltmeter and an ammeter, and how is each connected in a circuit - Answer- A volt meter reads the quantity of voltage, it is connected in parallel. A ammeter reads the quantity of amperage, it is measured in series with a load. What is a ampere - Answer- The intensity of power in a electrical circuit What is a volt - Answer- Electromotive force or the pressure of an electrical circuit What is a ohm - Answer- resistance or opposition to current flow a Kilowatt is equal to how many horsepower? - Answer- 1000 watts / 746 Watts per hp = 1.34 hp what is a kilowatt-hour - Answer- 1000 watts for a one hour duration Is used to shield the shaft - Answer- Sleeve The actual part of the pump that pumps - Answer- Impeller Pump rotates, but output decreases - Answer- slippage Prevent pump priming - Answer- Vacuum breaker Special material used around the shaft of a pump - Answer- packing
Used to prime a pump - Answer- Foot valve Prevents shaft wear - Answer- Bearing Prevents air leakage into pump - Answer- Latern Rings Controls pump output volume - Answer- Discharge valves Direction of the pump movement - Answer- Rotation List the 5 types of riveted joints in order of least secure to most secure - Answer- Single lap, Double lap, double butt & strap, Triple butt & strap, Quadruple butt & strap