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55.

To prevent self-heating errors becoming too great, the current through platinum element (100 ohm) is kept at a very small value :

A.	0.1 raA	B.	1 mA
C.	5 mA	D.	20 mA

56.

In calibration of temperature sensors by fixed point method, the device is calibrated at:

A.	ice point (0°C)	B.	steam point (100°C)
C.	sulphur point (444.6°C)	D.	all of the above

57.

Pick up correct statement about calibration of temperature sensors by comparison method using liquid bath :

A.	water is used for temperatures from 0 to I00°C	B.	special grade of paraffin oil is used for temperatures between 100 and 200°C
C.	For temperature between 200 and 600°C, a mixture of sodium nitrate and potassium nitrate is used	D.	all of above are true

58.

Local velocity is measured by a :

A.	pitot tube	B.	venturi tube
C.	orifice plate	D.	vena contracta device

59.

Flange taps in case of orifice plate are installed :

A.	25 mm from each side of the orfice plate	B.	D (pipe diameter) upstream and D/2 downstream
C.	just at surface of orifice plate	D.	2.5 D upstream and 8 D downstream

60.

Vena-contracta taps are employed :

A.	D upstream and D downstream from the plate	B.	D upstream and at vena contracta
C.	2 D upstream and at vena contracta	D.	just at surface of plate upstream and at vena contracta

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