The horizontal timber piece provided at the apex of a roof truss which supports the common rafter is called

A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

A

Remain horizontal

B

Slant up towards direction of pull

C

Slant down towards direction of pull

D

None of the above

The member which is placed horizontally to support common rafter of a sloping roof, is

A

Purlin

B

Cleat

C

Batten

D

Strut

To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be

A

1

B

2

C

3

D

4

The type of joint commonly used at the junction of a principal rafter and tie beam in timber trusses is

A

Mortise and tenon joint

B

Oblique mortise and tenon joint

C

Butt joint

D

Mitred joint

The opening provided in sloping roof with its top parallel to the roof surface, is called

A

Dormer window

B

Sky light window

C

Lantern window

D

Louvered window

A truss containing j joints and m members, will be a simple truss if

A

m = 2j - 3

B

j = 2m - 3

C

m = 3j - 2

D

j = 3m - 2

A projecting piece usually provided to support a truss, is

A

Cornice

B

Coping

C

Frieze

D

Lintel

Normally, the angle of roof truss with asbestos sheets should not be less than

A

$$26{\frac{1}{2}^ \circ }$$

B

30°

C

35°

D

40°

The function of cleats in a roof truss is

A

To support the common rafter

B

To support purlins

C

To prevent the purlins from tilting

D

All of the above

The function of king post in a king post roof truss is

A

To support the frame work of the roof

B

To receive the ends of principal rafter

C

To prevent the walls from spreading outward

D

To prevent the tie beam from sagging at its centre

The horizontal timber piece provided at the apex of a roof truss which supports the common rafter is called

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