[A]. 1 m
[B]. 1.5 m
[C]. 2 m
[D]. 2.5 m
✅ The correct answer is option B.
Steam Boilers and Engines MCQs
242. When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a
[A]. slow speed engine
[B]. medium speed steam engine
[C]. high speed steam engine
[D]. none of these
✅ The correct answer is option B.
243. In natural circulation steam boilers, the circulation of water is by convection currents which are set up during the heating of water.
[A]. Correct
[B]. Incorrect
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✅ The correct answer is option A.
244. The diameter of flue tube in a Cornish boiler is __________ that of the shell.
[A]. one-fourth
[B]. one-third
[C]. two-fifth
[D]. three-fifth
✅ The correct answer is option D.