541. Post weld heat treatment is done by____________________?
A. Normalising
B. Stress relieving
C. Tempering
D. Solution annealing

542. Rotary kilns in cement industry are lined with _____________bricks?
A. Fireclay
B. Silica
C. Lead
D. High alumina & high magnesia

543. Which of the following has no effect on the carbide forming tendency in steels ?
A. Molybdenum
B. Phosphorus
C. Chromium
D. Vanadium

544. High carbon steel contains more than _____________ percent carbon?
A. 0.5
B. 2.2
C. 2.5
D. 2.8

545. Manganese in steel affects its__________________?
A. Ductility
B. Tensile strength
C. Hardness
D. None of these

546. Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with______________?
A. Acidic refractory
B. Rubber
C. Karbate
D. Lead or acid proof bricks

547. Cast iron is__________________?
A. Used for making shock resisting parts
B. Manufactured in cupola and is brittle
C. Having compressive strength more than its tensile strength
D. All A., B. & C.

548. Maximum carbon content in cast iron is ______________ percent?
A. 3.8
B. 5.2
C. 4.8
D. 4.3

549. ______________ iron is produced, when molten pig iron is allowed to cool gradually?
A. White cast
B. Grey cast
C. Wrought
D. None of these

550. Reduction in the grain size reduces the _______________ of the material?
A. Fatigue resistance
B. Tensile strength
C. Creep resistance
D. All A., B. & C.

NOTE
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