Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

A

Minimum

B

Maximum

C

Zero

D

Infinity

Which of the following thermocouples has the widest temperature measurement range?

A

Iron-constantan

B

Chromel-alumel

C

Copper-constantan

D

Platinum-platinum/rhodium

Which of the following thermocouples can measure the maximum temperature?

A

Platinum-rhodium

B

Tungsten-molybdenum

C

Chromel-alumel

D

Iron-constantan

Which of the following thermocouples has the least temperature measurement range?

A

Copper-constantan

B

Chromel-alumel

C

Platinum-platinum/rhodium

D

Iron-constantan

Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

A

Steel

B

Vycor (a glass)

C

Nichrome

D

Inconel

All the thermocouples used for temperature measurement use dissimilar metal

A

Strips

B

Bars

C

Wires

D

Beads

The thermal emf-temperature relationship of most thermocouples is

A

Linear

B

Parabolic

C

Exponential

D

Square root

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.

A

Equal to

B

More than

C

Less than

D

Either more or less than (depending upon the fluid)

Invar used in thermocouples is an alloy of nickel and

A

Iron

B

Copper

C

Chromium

D

Lead

The sum of the currents into a junction is equal to the sum of the currents out of that junction.

A

True

B

False

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

Related Questions