1st Class Stationary Engineers Examination #3 Summary questions with complete solutions

Deaerator - A Device used to remove oxygen from boiler feedwater The term "quality of steam" has to do with steams - Moisture content A sleeve is used on the shaft of a centrifugal pump to - Protect the shaft The purpose of an adjusting ring on a safety value is to - Regulate the amount of steam exhausted The maximum wattage allowed on a 30 ampere fuse is (supply line is 115 volts) - W = V x I W = 115 x 30 W = 3450 watts A tachometer is used to measure - Revolution per minute If a Fahrenheit thermometer registered 100 degrees, what would be the reading on a centigrade scale? - C = (F-32) / 1.8 C = (100-32)/1.8 C = 37.8 Degree C Which of the following types of boilers are best suited for high ratings? - water tube boilers A warm air furnace duct transfers heat to a room by means of - Convection If a pressure gauge indicated a pressure of 20 PSI, what would be the absolute pressure per square inch? - PSIA = PSIG +14.7 PSIA = 20 + 14.7 PSIA = 34.7 PSI If a ton of coal contains 400 lbs. of ash, what percent of the coal is ash? - 20% The liquid or fluid used to clean an air compressor should have a - High Fire point Which of the following types of air compressor makes use of an inter-cooler - Reciprocating The proper extinguisher to use on an electrical fire in an operating electric motor is - Carbon dioxide An objectionable chemical found in fuel oil is - Sulphur Specific gravity can be measured by the use of a - hydrometer Normally the outlet water from a ziolite softaner should show a hardness reading of - Zero Economizers in large steam plants are generally used to - Increase the temperature of the feed water One of the major advantages of the horizontal rotary oil burner is that - The shape of the fire can be controlled by the shape of the cup The speed of a centrifugal pump driven by a certain induction motor is increased 10%, the quantity of water pumped will then be increased by approximately - 10% A method of determining when a fuel oil suction strainer should be cleaned is to clean it as soon as - The pressure drop across the strainer becomes excessive In order to "soften" feedwater before it enters the boiler, the following chemicals are usually used - Lime and soda ash In a steam plant, the fue gases pass through the equipment (1) superheater (2) economizer (3) induced draft fan (4) boiler (5) air heater,