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You Are On Multi Choice Question Bank SET 3296
164801. To set a oxidizing flame :
(A): Open acetylene gas and ignite to burn in air (B): Set a neutral flame and decrease acetylene (C): Set a neutral flame and increase acetylene (D): Set a neutral flame and decrease oxygon
164802. Which type of flame is used to wold brass ?
(A): Air acetylene flame (B): Neutral flame (C): Oxidizing flame (D): Carburizing flame
164803. What is the maximum thickness of MS sheet that can be weld in leftward technique ?
(A): 12 mm (B): 8 mm (C): 10mm (D): 5mm
164804. The angle of blow pipe to the line of weld in leftward welding technique is :
(A): 40 - 50‘ (B): 50 - 60° (C): 60 - 70 (D): 70’ -5O
164805. Copper should not be used in acetylene gas piping because :
(A): Copper react with acetylene and form explosive compound (B): Copper is weak metal (C): Acetylenecannot compressed (D): Copper hashigh expansion
164806. The greatest amount of heat is produced in an oxyacetylene flame at _________.
(A): Inner cone (B): Outer envelope (C): The out let tip of nozzle (D): Just ahead of innercone
164807. Purpose of lifting a hose protector is to __
(A): Permit the gas to flow from blow pipe to cylinder (B): Avoid return flow of gas to cylinder (C): Permit the gas flow in both directions (D): Avoid gas flow to blow pipe
164808. The maximum pressure of acetylene gas that can be compressed in a cylinder :
(A): 1 kg/cm2 (B): 15 kg/cm2 (C): 100 kg/cm2 (D): 150kg/cm2
164809. The function of gas regulator is____________.
(A): To get different type of flame (B): To mix both gases (C): To change temperature (D): To set working pressure
164810. The function of filler rixl in gas welding is________.
(A): To obtainadditional elements (B): To increase the fluidity (C): To obtaingood penetration (D): To help welding
164811. The safety device used to protect the eves while grinding is_________.
(A): Hand screen (B): Helmet (C): Chippinggoggles (D): Chipping screen
164812. Name the flux used for brazing of MS sheets :
(A): Hydrochloric acid (B): Zinc chloride (C): Tallow resin (D): Borax
164813. Acetylene gas is dissolved in________liquid in cylinder.
(A): Water (B): Acetone (C): Calcium hydroxide (D): Kerosene
164814. The colour code for identifying oxygen gas cylinder is_________.
(A): Maroon (B): Black (C): Blue (D): Red
164815. Oil and grease can react violently, when contact with high pressure ________.
(A): Carbon dioxide (B): Propane (C): Oxygen (D): Hydrogen
164816. When a hose protector is fitted, the gas can only flow_________.
(A): Blow pipeto cylinder (B): Cylinder to blowpipe (C): Both ways (D): Will not flow
164817. Soldering is a method of joining two metal pieces by means of a third metal having relatively _______________ melting temperature.
(A): Low (B): High (C): Equal (D): Above
164818. The flow of molten solder in the gap between the work pieces is driven by_______force.
(A): Centrifugal (B): Capillary (C): Viscosity (D): Wetting
164819. Solders melt at a temperature___________°C.
(A): Above 350 (B): Below 350 (C): Above 450 (D): None of the above
164820. Soldering tlux has a melting point__________the melting point of solder.
(A): Low (B): High (C): Equal (D): Above
164821. In brazing the filler material melt at a temperature_________the melting temperature of the material to be joined.
(A): Below (B): High (C): Equal (D): Above
164822. Soldering of MS sheets takes place at a temperature of___________.
(A): 150oC (B): 40oC (C): 250oC (D): 850oC
164823. One of the necessities of welding transformer is__________.
(A): To reduce voltage and increase current (B): To convert electrical energy to mechanical (C): To get defect free weld (D): To control distortion
164824. Which one of the following welding machine can supply AC or DC ?
(A): Engine driven Generator (B): Motordriven Generator (C): Transformer (D): Transformer rectifier
164825. The value of open circuit voltage in manual metal arc welding is__________volt.
(A): 40 - ISO (B): 60-70 (C): 60- 130 (D): 110-220
164826. Forge welding is classified as :
(A): Fusion welding without pressure (B): fusion welding with pressure (C): Non-tusion welding with pressure (D): Non-fusion welding without pressure
164827. If main electric supply is not available, we can do arc welding with_________.
(A): Motor generator set (B): Transformer set (C): Engine generator set (D): Rectifier set
164828. The amount of current setting for welding depends upon_____________.
(A): The thickness of plate (B): The type of currentAC/DC (C): Type of metal to be weld (D): The diameter of electrode used
164829. While selecting straight polarity___________.
(A): Electrode is connected to positive side (B): Base metal connected to positive side (C): l/3rd heat developed in base metal (D): 2/3rd heat developed in electrode
164830. The arc welding transformer is a____________transformer.
(A): Step down (B): Step up (C): One to one (D): Increasing voltage
164831. The easy position to weld is__________.
(A): Flat (B): Vertical (C): Horizontal (D): Overhead
164832. During over head welding it is more convenient to use
(A): Welding goggles (B): Helmet (C): Hand screen (D): Sun glass
164833. Depth of fusion from the surface of the weld metal is known as
(A): Fusion zone (B): Heat affected zone (C): Throat thickness (D): Leg length
164834. Electrode connected to positive terminal :
(A): Straight polarity (B): Wrong polarity (C): Reverse polarity (D): Electrode to holder
164835. More spatters are due to________________.
(A): Low current (B): More speed (C): Excess current (D): Big size electrode
164836. In DC supply the heat distribution is more at_________________.
(A): Positive terminal (B): Negative terminal (C): Equal in both terminal (D): No variation
164837. The effect of arc blow will be totally absent in______________.
(A): DC straight polarity (B): DX' reverse polarity (C): AC welding (D): Welding with long arc
164838. The electrodes are manufactured i
(A): 350 mm and 450 mm (B): 400 mm and 500 mm (C): 350 mm and 250 mm (D): 10' and 18'
164839. A lap joint has two standards lengths namely :
(A): Parts in the same plane (B): Overlapping parts (C): Parts in the same plane (D): A part perpendicular to another part
164840. In the 5G position, pipe must be located in a_______________axis.
(A): Vertical axis (B): Fixed horizontal axis (C): Rotating vertical axis (D): Fixed vertical axis
164841. Which is not coming under ferrous metal ?
(A): Steel (B): Iron ’ (C): Copper (D): Cast iron
164842. Which is not an alloy ?
(A): Steel (B): Brass (C): Stainless steel (D): Iron
164843. Which of these devices is/are acceptable and safe for lighting a welding torch ?
(A): Matches (B): Cigarette lighter (C): Spark lighter (D): All of the above
164844. What is the duty cycle of a welding machine designed to operate continuously for 7 out of every 10 minutes ?
(A): 10 percent (B): 70 percent (C): 30 percent (D): None of the above
164845. Name die instrument/tool used for transferring and setting of distances ?
(A): L square (B): Steel rule (C): Wing compass (D): Straight edge
164846. Ammonium Chloride is used as a flux for soldering ?
(A): Steel (B): Aluminum (C): Galvanized iron (D): Stainless steel
164847. Name of the instrument used to check the perpendicularity of the branch pipe with the main pipe of a pipe T joint ?
(A): Protractor (B): Try square (C): Spirit level (D): Straightedge
164848. Which one of the following metals will not permit X-rays to pass-through ?
(A): Stainless steel (B): Aluminum (C): Lead (D): Tin
164849. The distance between the root and toe of a fillet weld is called_____.
(A): Root gap (B): Leg length (C): Reinforcement (D): Throat thickness
164850. Thermit mixture used in thermit welding can be ignited with an initial temperature of
(A): 1500°C (B): 1000°C (C): 1200°C (D): 500°C
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