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151.

A first order system when subjected to a step input has a temperature rise of 25?C after one hour and 37.5?C after two hours, starting from cold conditions. The final steady temperature rise will be

A.	5?C	B.	15?C
C.	25?C	D.	35?C
E.	50?C

152.

In the above problem the thermal time constant will be

A.	1 hour	B.	1.44 hrs
C.	2.05 hrs	D.	2.55 hrs
E.	3.36 hrs

153.

In general, in which part of the scale does the pointer indicate most accurately?

A.	Around middle of the scale	B.	In the first quarter of the scale
C.	In the second quarter of the scale	D.	Around full capacity of the scale
E.	In the last third of the scale

154.

Which of the following primary transducer does not convert velocity to pressure?

A.	Orifice	B.	Venture
C.	Pitot tube	D.	Vanes
E.	All of the above

155.

A pitot tube converts

A.	Pressure head into velocity head	B.	Velocity head into pressure head
C.	Pressure head into temperature rise	D.	Velocity head into temperature rise
E.	None of the above

156.

The flow in open channel can be measured by

A.	Pitot tube	B.	Rotameter
C.	Turbine meter	D.	Venturimeter
E.	Orifice

157.

Which of the following is not an elecment of electro-pneumatic pressure transmitter?

A.	LVDT	B.	Bellows
C.	Opamp	D.	Flapper nozzle mechanism
E.	All of the above

158.

The flow of non-conducting medium cannot be measured by

A.	Orifice	B.	Rotameter
C.	Electro magnetic meter	D.	Turbine meter
E.	All of the above

159.

A pirani gauge is used to measure

A.	Pressures above 100 kg/cm2	B.	Pressure upto 100 kg/cm2
C.	Atmospheric pressure	D.	Very low pressures
E.	All pressures

160.

A thermometer has a time constant of 3.5 seconds. It is quickly taken from a temperature 0?C to water bath at 100?C. What temperature will be indicated after 1.5 second?

A.	100?C	B.	50?C
C.	35?C	D.	20?C
E.	15?C