The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:

Shrinkage allowance on pattern is provided to compensate for shrinkage when

A

The temperature of liquid metal drops from pouring to freezing temperature

B

The metal changes from liquid to solid state at freezing temperature

C

The temperature of solid phase drops from freezing to room temperature

D

The temperature of metal drops from pouring to room temperature

If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

A

(1 - C) mf - eE

B

(C - 1) mf + eE

C

(C - 1) mf - eE

D

(1 - C) mf + eE

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

A

Metal changes from liquid state to solid state at freezing temperature

B

Solid phase temperature drops from freezing temperature to the room temperature

C

Liquid metal temperature drops from pouring temperature to room temperature

D

Liquid metal temperature drops from pouring temperature to freezing temperature

Inspection of surface and sub-surface cracks in non-magnetic alloys is done by __________ testing method.

A

X-ray

B

Magnetic particle

C

Dye penetrant

D

Ultrasonic

What is the type of welding defect caused due to shrinkage during solidification and by weld stresses called?

A

Incomplete fusion

B

Lamellar tearing

C

Mismatch

D

Shrinkage void

A person needs 5 boards, each 3 feet 8 inches long but wood is not sold in fraction of a feet. What is the minimum length of wood, in feet, he must buy?

A

20

B

18

C

19

D

17

A carpenter needs 4 boards, each 2 feet 10 inches long,. If wood is sold only by the feet, what is the minimum length, in feet, of wood he must buy?

A

9

B

10

C

11

D

12

Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the

A

Decolourisation of sugar

B

Solvent recovery from air and gases

C

Absorption of gases and vapor

D

Electrode manufacture

Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

A

Half

B

One third

C

One fifth

D

One twelfth

A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be

A

Silver

B

Copper

C

Aluminium

D

Zinc

The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:

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