3rd Grade Stationary Engineer 21 – 40 questions and answers with solutions

3rd Grade Stationary Engineer 21 – 40 questions
and answers with solutions



What is a water tube boiler?
list 5 advantages
list 5 disadvantages
name 4 types - ANSWER in a water tube boiler, products of combustion
pass around tubes containing boiler water
ADVANTAGES:
1) rapid steamers
2) use less water
3) less chance of explosion
4) no flat surfaces
5) smaller tube sizes
DISADVANTAGES:
1) elaborate settings
2) field assembled
3) initial cost per pound of steam is higher
4) greater number of openings thus more air infiltration
5) require more floor space
TYPES:
1) B.&W.

, 2) Stirling
3) Heine
4) "D" type


what is a fire tube boiler?
list 5 advantages
list 5 disadvantages
name 4 types - ANSWER in a fire tube boiler, products of combustion
pass through tubes or flues surrounded by water.
ADVANTAGES:
1) very little setting required
2) factory assembled for fast installation
3) low initial cost
4) can be made portable
5) compact
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DISADVANTAGES:
1) slow steamers
2) limited in pressure and capacity
3) liable to disastrous explosions because drums and joints are set over
the fire
4) inefficient
5) inaccessible for inspection
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