QUESTIONS 131
23. Describe the fundamental differences in the working principles
of a reciprocating steam engine and a turbine steam engine.
24. Trace the complete circulation of the steam from the boiler
and back again and what it does at successive stages of its journey.
25. State what you know of a motorship and the advantages claimed
for the internal combustion engine
26. Describe the construction and principle of a mercurial barometer.
27. What precautions must be taken when mounting and unmount-
ing a barometer for transport?
28. What is (a) a millibar, (b) a vernier?
29. What is "error of capacity" and why is it not applied to readings
of the marine type of barometer?
30. Describe an aneroid barometer. How does it differ from a
mercury barometer? t
31. How may an aneroid be converted into a barograph?
32. Write down the freezing and boiling temperatures of fresh
water as indicated on the Fahrenheit, Centigrade and Absolute scales.
33. How is zero temperature Absolute arrived at?
34. Convert 132° Fahr. into Centigrade and Absolute.
60° Centigrade into Fahrenheit and Absolute.
150°-Absolute into Fahrenheit and Centigrade.
35. Describe the maximum and the TnimTmiiD thermometers and
state how these extremes are recorded.
36. Describe the construction, principle and use of a hygrometer.
37. In what kind of weather would you expect the greatest differences
in the wet and dry bulb thermometers? Which reads the lower?
38. What is a rain gauge? What is meant by 1 inch of rainfall?
39. Explain a method of receiving a wireless telegraphy directional
bearing on board ship. Is any correction of the radio bearing necessary
to obtain the true bearing of the distant station?
40. What standing orders are usually observed on board ship (a)
at sea, (b) at anchor, (c) in dock ?
41. Describe the fire-extinguishing appliances on board your ship,
42. The seat of fire in a hold is inaccessible, what steps might be
taken to subdue it?
43. How is a chemical fire extinguisher worked?
44. What is "Erefoam" and how is it used?
45. Describe any fire detecting and extinguishing system you know of*
46 Describe the procedure of any organised fire drill you have taken
part in and the duties of the various members of the crew.