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91.

A convenient unit for expressing very low pressures is the micron. A micron abbreviated u is

A.	0.1 mm of Hg column absolute pressure at 0?C	B.	1 mm of Hg column absolute pressure at 0?C
C.	0.01 mm of Hg column absolute pressure at 0?C	D.	0.001 mm of Hg column absolute pressure at 0?C

92.

Mercury used as manometer liquid has the disadvantage(s) that it

A.	amalgamates of corrodes many metals	B.	is expensive
C.	is poisonous	D.	all of the above.

93.

A disadvantage of using water as manometer liquid is its

A.	high vapour pressure	B.	corrosive nature
C.	high boiling point	D.	low vapour pressure

94.

Which of the following manometer liquids has maximum capillary rise relative to mercury?

A.	Water	B.	Mercury
C.	Carbon tetrachloride	D.	Ethly alcohol

95.

Which of the following manometer liquids has minimum capillary rise relative to mercury?

A.	Water	B.	Mercury
C.	Ethly alcohol	D.	Carbon tetrachloride

96.

Liquid column manometers are used to measure

A.	differential pressures of greater than 30 psi	B.	differential pressures of less than 30 psi
C.	high vacuums	D.	atmospheric pressure

97.

Bourdon gauges are used to measure pressures

A.	above 30 psia	B.	below 30 psia
C.	below 3 microns	D.	below 14.7 psia

98.

Ionisation gauge is used to measure

A.	pressure	B.	vacuum
C.	flow rate	D.	composition

99.

Mcleoid gauge is used to measure

A.	pressures of greater than 30 psia	B.	pressures of less than 30 psia
C.	high vacuums	D.	atmospheric pressure

100.

Tachometer is used to measure

A.	speed	B.	pressure
C.	composition	D.	speed