In a plate type heat exchanger, heat transfer plates are never made of _________________?

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Coke oven walls are lined with _____________ bricks?

A. Silica B. Tar-dolomite C. Low thermal conductivity D. Fire clay...

Balls in a ball mill are usually made of__________________?

A. Steel B. Cast iron C. Stainless steel D. Bronze...

Cast iron and steel pipes are produced by ____________ casting?

A. Die B. Investment C. Slush D. True centrifugal...

Nitriding of steel is done (in electric furnace) at _____________ °C?

A. 510 B. 1720 C. 2210 D. 910...

The impure iron (pig iron) that is tapped out from blast furnace contains about _____________ percent carbon?

A. 0.2 B. 2 C. 4 D. 8...