Building Materials -2

Weight of timber is taken at ____% moisture content

• 10

• 8

• 12

• 15

In radial sawing the saw cuts are

• Perpendicular to medullary rays

• Parallel to medullary rays

• Parallel to annual rings

• Perpendicular to annual rings

Find the defects in timber due to fungi attack

• Blue stain

• Wet rot

• Dry rot

• Foxiness

• Burl

Casehardening is a defect due to

• Fungi

• Natural force

• Seasoning

• Conversion

The method of curing Impreg and Compreg are respectively

• Pressure and Temperature

• Temperature and Pressure

The Bogue's compound with the highest rate of hydration

• $C_3S$

• $C_2S$

• $C_3A$

• $C_4AF$

In the dry process of manufacturing cement, gypsum is added

• After grinding

• During grinding

• During burning

• Before burning

In Le-Chatlier's test, the reading is taken in terms of

• mm(length)

• g(weight)

• s(time)

• %(of water)

White cement has higher strength than OPC

• True

• False

Final setting time of rapid hardening cement as per IS 8041

• 10 hrs

• 30 min

• 3.5 hrs

• 5 hrs