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51. The nominal size of the modular brick is_______________?

A. 190 mm x 90mmx 80 mm
B. 190 mm x 190 mm x 90 mm
C. 200 mm x 100 mm x 100 mm
D. 200 mm x 200 mm x 100 mm

52. Excess of silica in brick earth results in______________?

A. cracking and warping of bricks
B. loss of cohesion
C. enhancing the impermeability of bricks
D. none of the above

53. Which of the following ingredients of the brick earth enables the brick to retain its shape ?

A. alumina
B. silica
C. iron
D. magnesia

54. The process of mixing clay, water and other ingredients to make brick is known as______________?

A. kneading
B. moulding
C. pugging
D. drying

55. The internal size of mould used in brick preparation is__________________?

A. equal to the size of a fully burnt brick
B. smaller than the size of a fully burnt brick
C. greater than the size of a fully burnt brick
D. none of the above

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

A. overburnt bricks
B. underburnt bricks
C. refractory bricks
D. first class bricks

57. Pug mill is used for_______________?

A. preparation of clay
B. moulding of clay
C. drying of bricks
D. burning of bricks

58. Excess of alumina in brick earth makes the brick______________?

A. impermeable
B. brittle and weak
C. to lose cohesion
D. to crack and warp on drying

59. Percentage of silica in a good brick earth lies between_______________?

A. 5 to 10%
B. 20 to 30%
C. 50 to 60%
D. 70 to 80%

60. The percentage of alumina in a good brick earth lies between________________?

A. 5 to 10%
B. 20 to 30%
C. 50 to 60%
D. 70 to 80%