Which of the following methods is used to control temperature in resistance furnaces?

Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

A

Babbitt metal

B

Monel metal

C

Nichrome

D

Phosphor bronze

Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

A

Pyrometer

B

Thermocouple

C

Thermometer

D

Thermistor

Maximum heat transfer in high temperature furnaces is by

A

Conduction

B

Convection

C

Radiation

D

Either A, B or C; depends on the type of furnace

Resistance variation method of temperature control is done by connecting resistance elements in

A

Series

B

Parallel

C

Series-parallel connections

D

All of the above ways

Which of the following bricks are used for lining of furnaces?

A

Over-burnt bricks

B

Under-burnt bricks

C

Refractory bricks

D

First class bricks

Magnesite bricks are used in those parts of furnaces, which are

A

Subjected to temperature fluctuation

B

Required to resist corrosive basic slag

C

Subjected to high load

D

None of these

Magnesite refractories are used for the construction of those furnaces, which are

A

Not required to resist the corrosive action of basic slag

B

Not subjected to fluctuation in temperature

C

Used for raising & maintaining high temperature

D

Both (B) and (C)

Hearth furnaces are not used for

A

Roasting

B

Melting

C

Reheating

D

None of these

Shaft furnaces are used for

A

Smelting

B

Calcining

C

Roasting

D

All of the above

By the use of which of the following, high frequency power supply for induction furnaces can be obtained?

A

Coreless transformers

B

Current transformers

C

Motor-generator set

D

Multiphase transformer

Which of the following methods is used to control temperature in resistance furnaces?

Related Questions