71. Which one of the following is used for preparing porcelain?
A.Clay
B. Feldspar
C. Quartz
D. All of these
D. All of these
72. The main ingredients of Portland cement are
A. Lime and silica
B. Lime and alumina
C. Silica and alumina
D. Lime and iron
A. Lime and silica
73. The main ingredients of Portland cement are
A.Lime and silica
B.Lime and alumina
C.Silica and alumina
D. Lime and iron
74.The proportions of lime and sand in the mortar normally used in brick construction are
A. 1:2
B.1:4
C. 1:6
D. 1:8
A. 1:2
75. Index number expressing the relative sizes of both coarse and fine aggregates, is called
A. Proportioning of aggregates
B. Finenessmodulus
C.Grading of aggregates
D. None of these
B. Finenessmodulus
76. Spalling hammer is used for
A. Driving wooden-headed chisels
B. Rough dressing of stones
C. Carving of stones
D. Breaking small projections of stones
B. Rough dressing of stones
77. The pressure acting on the stones in stone masonry construction should be
A. Along the direction of bedding planes
B. At 45° to the direction of bedding planes
C. At 60° to the direction of bedding planes
D. Perpendicular to the direction of bedding planes
D. Perpendicular to the direction of bedding planes
78. Pick up the constituent of good brick earth whose excess causes the raw bricks to shrink and warp during drying and burning, from the following
A. Alumina
B. Lime
C. Iron-oxide
D. Magnesia
79. The type of bond provided in brick masonry for carrying heavy loads is
A. Single Flemish bond
B. Double Flemish bond
C. English bond
D. Zigzag bond
C. English bond
80. Blister steel
A. Is obtained by the cementation process
B. Is full of fissures and cavities
C. Can be easily welded
D. All the above
D. All the above
