SH f2w
The changes that occur during dehydration period are :
(a) 1, 3, 5 (b) 1, 2, 4
(c) 1, 2, 3 (d) 2, 4, 5- When the deposits of efflorescence is more than 10 per cent but less than 50 per cent of the
exposed areas of brick, the presence of efflorescence is classified as
(a) slight (b) moderate
(c) heavy (d) serious - A good brick when immersed in water bath for 24 hours, should not absorb water more
than
(a) 20% of its dry weight (b) 15 % of its saturated weight
(c) 10% of its saturated weight (d) 20% of its saturated weight - Crushed pottery is used in the manufacture of
(a) fire bricks (b) stone bricks
(c) terracotta (d) clay tiles - Match List I with List II and select the correct answer used the codes given below the lists:
List - I List - II
A. Acid Brick 1. Made from Quartzite
B. Silica Brick 2. Made from magnesite
C. Basic Brick 3. Made from fire clay
D. Neutral Brick 4. Made from chromite
Codes :
(a)AB C D (b)AB C D
3124 3214
(c)AB C D (b)AB C D
4123 1234 - The compressive strength of burnt clay bricks as per IS 1077 is
(a) 100 kg/cm^2 (b) 150 kg/cm^2
(c) 100 – 150 kg/cm^2 (d) 35 – 350 kg/cm^2 - The deformation of the shape of bricks caused by the rain water falling on the hot bricks
is known as
(a) spots (b) checks
(c) chuffs (d) blisters - The defect in clay products because of imprisoned air during their moulding is known as
(a) blister (b) lamination
(c) cracks (d) spots - Basic refractory bricks consist of
(a) silica bricks (b) ganister bricks
(c) magnesia bricks (d) chromite bricks - In steel industry the bricks used for lining furnances should be
(a) acid refractory (b) basic refractory
(c) neutral refractory (d) heavy duty - Terracotta is burned in
(a) pug mill (b) reverberatory furnance
(c) muffle furnance (d) puddling furnance