Engineering :: Instrumentation and Process Control

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61.

A mercury-in-glass thermometer and a platinum resistance thermometer are calibrated from measurements on ice and steam points. The two thermometers then necessarily agree

A.	at every temperature	B.	only at the calibrated points
C.	at temperature midway between the calibrated points	D.	at temperatures near zero kelvin.

62.

The resistance of platinum

A.	increases with increase in temperature	B.	decreases with increase in temperature
C.	remains constant with change in temperature	D.	decreases linearly with increase in temperature

63.

Resistivity is minium for

A.	Ni	B.	Pt
C.	Cu

64.

Conductivity of platinum

A.	remains constant with change in temperature	B.	increases with increase in temperature
C.	decreases with increase in temperature	D.	increases linearly with increase in temperature

65.

The temperature coefficient of resistance of a wire is 0.00125 per ?C. At 300 K its resistance is 1 ohm. The resistance of the wire will be 2 ohms at

A.	1154 K	B.	1100 K
C.	1400 K	D.	1127 K

66.

On increasing temperature the resistance will decrease for

A.	platinum	B.	carbon
C.	copper	D.	constantan

67.

In the thermistors resistance

A.	remains unaffected with change in temperature	B.	increases with increase in temperature
C.	increases linearly with incease in temperature	D.	decreases with increase in temperature

68.

Thermistor is made of

A.	oxides or salts of metals	B.	metal
C.	two different metals	D.	two similar metal wires.

69.

Radiation pyrometer works on the principle of

A.	Stefan-Boltzmann law	B.	Ohms law
C.	Seebeck effect	D.	Curies law

70.

The refractive index of a gas

A.	is inversely proportional to temperature	B.	is directly proportional to temperature
C.	is independent of temperature	D.	varies as the square root of temperature