Explore topic-wise InterviewSolutions in .

The CORRECT CHOICE is (d) STEEL

Easy explanation: It is found that the Steel loses its tensile strength with the increase in the heat and yield stress of mild steel at 600°C is about ONE third of its value at normal temperature. Hence, under intense fire, the unprotected steel BEAMS sag, unprotected Steel column buckle and structure collapse.

Correct option is (d) Connectors

Best explanation: The connectors do not damage the TIMBER and are FOUND to possess sufficient strength. They are usually embedded in the individual members in such a way that the gradual transfer of STRESS from one MEMBER to other is perfectly ensured and there is no danger of sliding of joints.

The correct CHOICE is (c) LENGTHENING

Explanation: Lengthening joints are also KNOWN as the spliced or longitudinal joints. The method of lengthening will depend on the situation of the MEMBER in a frame STRUCTURE where such joints are commonly required.

The correct option is (a) Straps

To explain: The breadth of STRAP is about 40 mm to 50 mm and it’s THICKNESS depends upon the STRESS coming up on it. The great advantage of using a strap is that the TIMBER is not required to be CUT and thus the timber is not weekened.

Correct choice is (c) Wedges

Easy explanation: Wedges are the pieces of wood that are tapered and are used for securing TIMBER JOINTS as in case of mortise and tenon JOINT. They are SOMETIMES known as the keys and when used in pairs, they are termed as the folding wedges.

Right OPTION is (d) Screws

The explanation is: Screws are used under the following CIRCUMSTANCES; the work is likely be removed; the security of work is required without making the joint UNNECESSARILY rigid; the driving of a nail is likely to SPLIT the timber; the joint is SUBJECTED to the vibrations and work done to be is in pieces.

Correct choice is (B) Dogs

The best EXPLANATION: Dogs MAYBE flat or circular. The ends of dogs are appointed so as to facilitate DRIVING into the timber. Dogs can be imagined as a channel SECTION with sharpen ends.

The correct option is (d) Asbestos cement

Easy explanation: Asbestos cement POSSESS high FIRE resistance. HENCE, the asbestos cement products are widely used for the construction of fire resistant partition WALLS, roofs, etc. This material is also used as a protective covering against fire.

Correct answer is (a) INTERNAL HAZARD

For explanation I would say: Internal Hazard CONCERNS damage or destruction of the BUILDING itself and it is directly related to the FIRE load which, in turn, enables the building to be graded when considered along with the duration of fire.

Correct option is (a) SCREWDRIVER bit

To EXPLAIN I would say: The given figure REPRESENTS a screwdriver bit. It is a BORING tool which is used for boring holes of various sizes and shapes.

Correct ANSWER is (a) CIRCULAR

Best explanation: Wire NAILS are circular in shape. They can also be FOUND in an oval shape. They are usually made up of steel or wrought iron.

The correct option is (b) Fire LOAD

For explanation: The fire load is determined by MULTIPLYING the weights of all COMBUSTIBLE materials by the RESPECTIVE calorific values and dividing by the floor area under consideration. The fire load is used for grading of occupancies as per BSI: 1641-1960.

Correct CHOICE is (c) Trapezoidal

The best I can explain: Cut NAILS are trapezoidal in section. Usually, they have small lengths. They are used to secure timber JOINTS in position.

Right answer is (b) BEAD

Explanation: Bead is used at the JOINTS of straight board to avoid the unsightly appearance of the joint in case of shrinkage of WOOD. The four forms of Bead, namely, single quirked BEADS, double quirked flush beads, cock bead and cock bead with fillet.

Correct CHOICE is (C) Exposure hazard

The best I can EXPLAIN: Sometimes a fire spreads into a building through the open AIR from fire in other adjacent buildings or from across the road or other divisions of the same building. The RISKS involved in such fire spreading is known as the Exposure Hazard.

The correct option is (B) Grounds

The explanation: The SURFACES of grounds are flush with PLASTER and THUS they act as a guide for the plastering WORK. The grounds are used in superior work.

The correct answer is (B) 120°C

The explanation is: If escape from a tall building is not affected within 10 minutes or 15 minutes of the outbreak of FIRE, the temperatures as high as 800°C and DENSE poisonous smoke can fatally trap the people within the building. It is estimated that nearly 15000 people are KILLED by fire every year in our COUNTRY.

Right choice is (b) CARBON monoxide

The best I can explain: Carbon monoxide is the most abundant of fires gases. It is INVISIBLE and odourless. Nitrogen dioxide is extremely toxic and it numbs or deadens the THROAT.

The correct option is (c) CARBON dioxide

The EXPLANATION: Whereas, Hydrogen sulphide effects the nervous system and it causes dizziness and PAIN in the RESPIRATORY system. Also, nitrogen dioxide is extremely toxic and it numbs or deadens the throat.