Engineering :: Instrumentation and Process Control

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11.

Ordinary mercury-in-glass thermometer (without any covering or air gap) is an example of

A.	first-order system	B.	overdamped second-order system
C.	underdamped second-order system	D.	multiple first-order systems

12.

U-tube type mercury manometer is an example of

A.	zero-order system	B.	first order system
C.	second-order system	D.	third-order system

13.

Which of the following is not a first order instrument?

A.	U-tube type mercury manometer	B.	Bimetallic thermometer (bare)
C.	Vapour pressure thermometer (bare)	D.	Ordinary mercury-in-glass thermometer (without avy covering or air gap).

14.

Which of the following is a first-order instrument?

A.	U-tube type mercury manometer	B.	Bimetallic thermometer with covering
C.	Vapour pressure thermometer without any covering	D.	mercury thermometer with covering.

15.

Measuring lag of a first-order instrument is taken as

A.	zero	B.	one time constant
C.	two time constant	D.	hal time constant

16.

The temperature of a furnace falls at the rate of 180?F per hour. The instrument must not be in error by more than 9?F. What maximum time constant is permissible if the instrument has a first-order type response

A.	3 minutes	B.	1800 minutes
C.	27 minutes	D.	20 minutes

17.

What temperature has the same numerical value in Fahrenheit and Kelvin scales?

A.	273.15?	B.	574.6?
C.	459.6?	D.	491.6?

18.

What temperature has the same numerical value in Fahrenheit and Centigrade scales?

A.	32?	B.	0?
C.	100?	D.	?40?

19.

Two thermometer one Centigrade and the other Fahrenheit are put in a beaker containing hot fluid. The reading on the Fahrenheit thermometer is found to be just three times the reading on the Centigrade thermometer. The temperature of hot fluid must be

A.	100?	B.	26.67?
C.	80?	D.	70?

20.

Ordinary mercury-in-glass thermometers are used to measure the temperature in the range of

A.	?30? to 350?C	B.	?20? to 1600?C
C.	60? to 600?C	D.	0? to 600?C