Refractory Technology MCQs

Chemical Engineering Objective Questions

Home / Chemical Engineering / Refractory Technology

127. 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

128. Which one contains maximum percentage of Al₂O₃?

D. Aluminous firebrick

129. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?

A. Tar bonded dolomite bricks

B. Fireclay bricks

C. Mullite bricks

D. Magnesite bricks

130. What is Thoria?

A. Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock

B. Thoria Has high resistance to basic slags

C. Which is expensive & radioactive, is used in crucibles for melting high purity metals

D. All of the above

131. To resist spalling tendency, a refractory should have

A. Greater diffusivity

B. Low specific heat

C. Low thermal co-efficient of expansion

D. All of the above

132. Chrome magnesite brick is not used for lining the

A. Hearth of soaking pits

B. Bottom hearth of reheating furnace

C. Coke oven regenerator

D. Burning zone of limestone rotary kilns

133. With increase in the porosity, thermal spalling resistance of fireclay brick

C. Remains same

D. May increase or decrease

Page 19 of 32

« 17 18 19 2021 »