Explore topic-wise InterviewSolutions in .

Right OPTION is (a) Principle rafters

Easiest explanation: The lower and upper hip rafter is generally supported on a diagonal piece of wood that is LAID across the CORNER of the WALL. This diagonal piece is KNOWN as a Dragon Beam or a dragon Tie or angle Tie.

The CORRECT ANSWER is (c) V

Easiest explanation: The joints between the stone slabs in Jodhpur type roofing should be V-shaped. It is usually used over flagstone roofing. HOWEVER, it can also be used over R.C.C. slab.

The correct option is (a) Asbestos cement

EASY EXPLANATION: Asbestos cement sheets are commonly known as the AC sheets, with a series of waves or corrugations are formed and they are used for factories, workshops, big HALLS, etc. The corrugation helps to increase strength and rigidity and permit the easy FLOW of rainwater.

Right answer is (d) Trussed roofs

The explanation is: Triple-membered roofs are ALSO KNOWN as trussed roofs. A triple-membered ROOF is used when the length of the room is LARGE and the span of the room exceeds 5 METRES.

The correct ANSWER is (a) Single

Easiest EXPLANATION: Lean on ROOF, couple roof, couple close roof, collar beam roof and collar & SCISSORS roof are the some varieties of a single roof.

Right choice is (a) Jack Rafter

Explanation: Common RAFTERS are the INTERMEDIATE rafters which give support to the ROOF covering. Where as, any rafter with is shorter than a common rafter is KNOWN as Jack Rafter.

The correct OPTION is (a) Pitched roofs

Explanation: Pitched roofs are preferred in areas having heavy rainfall. They have a sloping top surface which ALLOWS the RAIN or snow to SLIDE off. Buildings having limited width can usually be covered by pitched roofs satisfactorily.

The correct choice is (b) False

The best explanation: Tie beam is a horizontal MEMBER which is used in a COUPLE close roof. It is provided at the level of the wall PLATES whereas, in a COLLAR beam roof, a raised beam known as a collar beam is used. Collar beam is ALSO known as a collar tie.

The correct ANSWER is (a) King rod

To explain: The CENTRAL vertical rod provided in the couple CLOSE roofs is called king rod. Its FUNCTION is to connect the tie beam and the RIDGE piece.

Right answer is (d) Zinc

The best I can explain: Zinc is USED for the GALVANISATION of iron sheets. It is done in order to PREVENT the RUSTING of iron by cutting the contact of iron with air or moisture.

The CORRECT answer is (c) Seven and a half

Best explanation: Number of corrugations in ONE big-six type A.C. sheet is seven and a half. The overall depth of big six-type A.C. SHEETS is 55 mm. While the standard corrugated sheets have ten and a half corrugations PER sheet.

Correct answer is (a) Double roof

Easiest explanation: Double roof is also known as rafter roof or purlin roof. Double ROOFS are used when the span exceeds 5 METRES. Purlin is used to tie the RAFTERS together.

Right answer is (a) COLLAR and scissor

Easy EXPLANATION: Whereas, Lean-on roof is generally used for SHEDS, out houses ATTACHED to MAIN buildings, varandahs, etc. It is suitable for a maximum span of 2.4 metres.

Right answer is (B) False

Explanation: FLAT roof CONSTRUCTION has a much slower SPEED than the pitched roof construction. However, the initial cost of flat roofs is much more than the pitched roofs.

The correct answer is (c) They require protective paint

Explanation: Asbestos cement SHEETS are LIGHT in weight, fire-RESISTANT and vermin resistant. They do not require any protective paint. These sheets are widely USED in industries, factories, cinemas, auditoriums etc.

Correct OPTION is (c) Thatch

The explanation: Thatch is combustible, absorbs moisture rapidly and is easily liable to DECAY. It isunstable against high winds. A bed of matting is prepared to RECEIVE the hatch and in ORDER to drain the roof easily, a PITCH of 45° is kept.

Right option is (d) CURVED roofs

The BEST I can EXPLAIN: Curved roofs are more preferred for public buildings like libraries and THEATRES. Their top surface is curved. These roofs provide architectural effects. They include cylindrical shells and shell domes.

Right choice is (a) Madras terrace roofing

To explain I would say: Brick-jelly roofing is also known as Madras terrace roofing. In this, specially prepared bricks of size 15 cm x 5 m x 12 MM are GENERALLY used and wooden joists are placed on rolled steel joists having a furring PIECE in between.

Correct choice is (a) True

For EXPLANATION: Flat ROOFS can be made fireproof EASIER than pitched roofs. Flat roofs have much better insulating properties and are more stable against high winds.

The correct option is (B) Strut

For explanation: The principal rafter in a steel roof TRUSS is usually made of TWO angle sections. The main TIE is also made of two angle sections. However, STRUTS are usually made of single angle sections.

Right choice is (d) Bel-fast truss

Best explanation: Bel-fast truss is in the SHAPE of a bow. It comprises of thin sections of TIMBER. This TYPE of truss is also KNOWN as bowstring truss or latticed ROOF truss.

Correct answer is (a) Lean-to-roof

Easiest explanation: Lean-to-roof is also known as a pent roof. It is also known as the AISLE roof. Lean-to-roof is the simplest type of SLOPING roof. In this, RAFTERS’ SLOPE to ONE side only.

Right choice is (B) King post truss

The explanation: A King post truss is suitable for roofs of span varying from 5 m to 8 METERS. The incline members, KNOWN as the Struts, prevent the principal RAFTER from bending in the middle.

Right CHOICE is (d) Battens

To elaborate: Battens support the ROOF ceiling. Whereas, the triangular upper part of a WALL FORMED at the end of the pitched roof is KNOWN as a Gable.

The correct choice is (b) Hip

To explain: Whereas, the inclination of sides of a roof to the HORIZONTAL plane is known as the PITCH and it can be expressed either in terms of degrees or as the ratio of RISE to span.

The correct OPTION is (d) 15 cm

Explanation: The thickness of a thatch roof covering should be at least 15 cm. It CONSISTS of bundles of straw or reeds. GENERALLY, a straw thatch can last for about 20 years and a reed thatch can last for about 60 years.

Right CHOICE is (a) True

For explanation: WOOD shingles roofing is not fire resistant. Shingles are thin slabs of wood that are used to cover the roofs. They are used only in HILLY areas where LOCAL timber is easily and cheaply available.

Right answer is (b) French

For explanation: Mansard ROOF truss is named after a French ARCHITECT named Francois Mansard. This type of roof is a combination of king-post and queen-post TRUSSES.

Right OPTION is (b) 2.5 metres

For explanation: Lean-to-roof is suitable for a maximum span of 2.5 metres. These types of ROOFS are generally used for sheds, verandahs ETC. Hence, they can also be CALLED verandah roofs.

The correct answer is (B) Doubly curved tile

The explanation: Here, the precast units of cement CONCRETE tiles are PREPARED at the SITE. The SIZE of the tile is kept about 700 mm x 700 mm with a uniform thickness of at least 20 mm. The cement concrete of proportion 1:2:4 is adopted and the units are properly cured.

Correct choice is (a) Collar BEAM

To explain: The tie beam is then KNOWN as a Collar or collar beam. A collar beam ROOF is adopted to ECONOMISE the space and to increase the height of the roof. The collar beam is usually fixed at one THIRD to one half the vertical height from the wall to the Ridge.

Correct answer is (C) Sodium salt

Easiest explanation: MUD-terrace ROOFING is made of white EARTH mud which contains a large percentage of sodium salt. This type of TERRACING is used in those areas where rainfall is less.

Correct OPTION is (d) 10 m

The best I can EXPLAIN: TIMBER trusses are not preferred when the span is greater than 10 m. In this case, timber trusses become UNECONOMICAL whereas steel trusses are more economical. Hence, steel trusses are used in place of timber trusses.

The CORRECT choice is (a) SINGLE lapped

The BEST I can EXPLAIN: Pan-tiles are single lapped. These tiles are flat longitudinally and curved transversally. However, plain tiles are double lapped.

Correct choice is (b) False

For explanation: Mansard ROOF truss is a two-storey truss. The UPPER PORTION consists of a king-post truss while the LOWER portion consists of a queen-post truss.

Right choice is (b) Princess post

For explanation: In the COMBINATION of king-post and queen-post trusses GIVEN above, A represents king-post, B represents queen-post and C represents princess post. A princess post is used to STRENGTHEN the queen-post TRUSS for large SPANS.

Right OPTION is (d) Collar beam roof truss

For explanation I would say: The VARIOUS TYPES of truss used in triple-membered roofs are mansard roof truss, king-post roof truss, queen-post roof truss, truncated roof truss etc. A collar beam roof is a type of SINGLE roof which is ALSO known as a collar tie roof.

Correct ANSWER is (c) COLLAR beam

Best explanation: The figure given above is of a collar beam roof. In this figure, A represents ridge PIECE, B represents rafter, C represents wall plate, D represents collar beam and E represents eaves board. The collar beam is PROVIDED at a raised level.

Right ANSWER is (d) Ruberoid

Easiest explanation: Ruberoid is not affected by Extreme heat or cold and it is not attacked by white ants. This MATERIAL is AVAILABLE in two colours, red and grey. This material is available in rolls.

Correct option is (b) RIDGE

The explanation: The apex line of a PITCHED ROOF is KNOWN as the ridge. Horizontal wooden members are provided at the apex of a roof truss in the form of BEAMS. These are known as ridge pieces or ridge beams.