Pipefitter Star Exam Part 1

Violent flashing and collapsing of vapor bubbles in a centrifugal pump is called. - Answer- Cavitation Device that controls the pressure in a low pressure steam boiler - Answer- Pressuretrol Function of an evaporator - Answer- Absorb heat from the system Metal which has a high iron content - Answer- ferrous Why should the angle between the leg of a swing and the load never be less than 30 degrees? - Answer- More stress loads are applied on the sling What are two kinds of misalignment that must be checked for when installing pumps? - Answer- Parallel and angular alignment What is the function of a compressor? - Answer- Create flow in the system After fittings and tubes are cleaned and fluxed, they should be assembled and soldered - Answer- As soon as possible The relief valve is sized to the ________ rating of a boiler - Answer- Gross Output Four types of copper tube joints - Answer- Soldered, Brazed, Flared, Compression Most common hanger type - Answer- Clevis Which hitch can support the most weight? - Answer- Basket Hitch Minimum safe working distance for overhead power lines - Answer- 10 feet Three basic hitches which can be used for lifting with a sling - Answer- Straight, Choker, Basket Amount of heat required to bring about a change in a state in a substance - Answer- Latent heat Harmful products of incomplete combustion - Answer- Carbon Monoxide & Aldehydes Regulating or throttling flow is done with - Answer- Globe 4 main components in a refrigeration system - Answer- Compressor, Condenser, Evaporator, Metering device. Quanting of hea