Description : Why it is sometimes necessary to preheat the base material before welding? a) To remove oil and grease b) To remove moisture from inside the material c) To prevent the possible risk of cracking d) Not required if using cellulosic electrodes as these will provide enough heat
Last Answer : c) To prevent the possible risk of cracking
Description : When welding medium carbon steel plates over 100mm in thickness would the basic electrodes require any pre treatment before use? a) None if they were in a vacuum pack opened 8 hours prior to use b) None if ... ) Heat to 500 °C for 2 hours if used outside d) Baked at 150°C for 4hours prior to use
Last Answer : b) None if they were in a sealed vacuum pack prior to use
Description : A butt weld has been made by MMA in a 50mm thick impact tested steel plate. The welding electrode used was a basic type, 5mm diameter. The measured welding parameters for one of the runs was 250 amps, 24 volts, using DC ... given to calculate the arc energy b) 1.9 kJ/mm c) 1.87 kJ/mm d) 2.0 kJ/mm
Last Answer : d) 2.0 kJ/mm
Description : Which of the following uses a flat characteristic? a) MAG (GMAW) b) Oxy-fuel gas welding c) Resistance spot welding d) SAW using greater than 1000 amps
Last Answer : a) MAG (GMAW)
Description : The welders have increased the voltage on the SAW welding set, what would be the effect on the weld appearance? a) No effect b) The weld width would be narrower c) The penetration will be increased d) The weld width would be wider
Last Answer : d) The weld width would be wider
Description : At what temperature is glass fused to steel in the making of glass-lined equipment? The borosilicate glass is typically fused to carbon steel at a temperature of about 800 0C. 87. What are some typical applications for glass-lined reactors?
Last Answer : Glass-lined equipment gives superior protection to all mineral acids at all concentration and temperatures. One exception is hydrofluoric acid. They are also used is high-purity processes where cleanliness ... to the walls of the vessels while glass-lined vessels have good anti-stick properties.
Description : What is the sign of Rutile ?
Last Answer : Routile's signal TiO2
Description : what means:paint formulated with RUTILE grade TITANIUM
Last Answer : Need Answer
Description : Which of the following minerals is not subjected to magnetic separation method? (A) Rutile (B) Galena (C) Chromite (D) Siderite
Last Answer : (B) Galena
Description : Why is an organic compound fused with Sodium for testing nitrogen,halogens and sulphur ?
Last Answer : On fusing with sodium metal the elements presents in an organic compounds are converted in to ionic compounds of sodium which are water soluble which can be filtered and detected by the respective tests.
Description : Who should select the specific welds for NDT, to cover the 10% contractual percentage required by the specification/Code? a) Anyone can select the welds as its just a random choice b) The welder ... welding is always carried out to a high standard the use of percentage NDT is of no real value
Last Answer : c) This will be referenced in the inspection and test plan
Description : Which of the following is not used as a medium for high temperature heating ? (A) Dowtherm (B) Mercury (C) Liquid metal (e.g. molten sodium) (D) Fused salts (e.g., an eutectic mixture of 53% KNO3 , 40% NaNO2and 7% NaNO3 )
Last Answer : (B) Mercury
Description : Oxyacetylene reducing flame is used while carrying out welding on (A) Alloy steel (B) Grey cast iron (C) Mild steel (D) High carbon steel
Last Answer : (C) Mild steel
Last Answer : Option C
Description : ______is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ? (a) Grey cast-iron (b) Cast steel (c) High carbon steel (d) Stainless steel
Last Answer : (b) Cast steel
Description : Discuss functions of flux used to welding. Identify properties of material suitable for flux and state two materials used as flux.
Last Answer : Functions of flux 1. A flux is a material used for removal of oxides and other undesirable substances. 2. Flux is a material used to prevent dissolve or facilitate removal of oxide. 3. ... in liquid 5. For welding alloy steel:- Mixture of boric acid , Dehydrated borax and calcium fluorides
Description : Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion. (A) Annealing (B) Toughening (C) Work hardening (D) Tempering
Last Answer : (A) Annealing
Description : A cellulosic wall is found in the cells of - (1) animals (2) bacteria (3) fungi (4) plants
Last Answer : (4) plants Explanation: Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. It is a complex carbohydrate, that is composed of glucose units.
Description : Rayon is a __________ fibre. (A) Cellulosic (B) Polyamide (C) Polyester (D) Natural
Last Answer : (A) Cellulosic
Description : Which of the following has proved helpful in preserving pollen as fossils? (a) Pollenkitt (b) Cellulosic intine (c) Oil content (d) Sporopollenin
Last Answer : (d) Sporopollenin
Description : Cytoskeleton is made up of (a) callose deposits (b) cellulosic microfibrils (c) proteinaceous filaments (d) calcium carbonate granules.
Last Answer : (c) proteinaceous filaments
Description : Which one of the following is wrong for fungi? (a) They are eukaryotic. (b) All fungi possess a purely cellulosic cell wall. (c) They are heterotrophic. (d) They are both unicellular and multicellular.
Last Answer : (b) All fungi possess a purely cellulosic cell wall.
Description : Litharge is (A) Lead oxide (B) Zinc oxide (C) Zinc sulphide (D) Cellulosic photographic material
Last Answer : (A) Lead oxide
Description : Which of the following has proved helpful in preserving pollen as fossils ? (1) Pollenkitt (2) Cellulosic intine (3) Oil content (4) Sporopollenin
Last Answer : (4) Sporopollenin
Description : A cellulosic wall is found in the cells of (1) animals (2) bacteria (3) fungi (4) plants
Last Answer : plants
Description : Welding requires a. Non-skilled worker b. Skilled worker c. Any worker
Last Answer : b. Skilled worker
Description : With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected. (A) Impact strength (B) Percent elongation (C) Hardness (D) Both 'b' & 'c'
Last Answer : (A) Impact strength
Description : Forge welding involves heating of parts to elastic stage and joint is prepared by impact force. a) Yes b) No, it is done up to plastic stage c) Heating is done up to boiling point d) None of the listed
Last Answer : b) No, it is done up to plastic stage
Description : What is the testing frequency of new AT weld ? (i) Just after the welding (ii) After 7 days of welding (iii) With in the one month of welding* (iv) None of the above
Last Answer : iii) With in the one month of welding*
Description : What information should be recorded as a minimum, on a completed production weld? a) Size and type of electrode and b) Welding supervisor’s name c) Welder’s Identification, date and weld number d) Welding inspectors name
Last Answer : c) Welder’s Identification, date and weld number
Description : What course of action should be taken upon finding a welder using incorrect shielding gas? a) Allow welding to proceed if the workmanship is good b) Report the incident and record all relevant ... the same as the approved one d) Change the electrode for the correct type and continue welding
Last Answer : b) Report the incident and record all relevant information
Description : Carbon percentage in medium carbon steel is around (A) 0.1 to 0.35 (B) 0.35 to 0.5 (C) 0.8 to 1.4 (D) 1 to 1. 5
Last Answer : (B) 0.35 to 0.5
Description : Hammers and railway rails are normally made of (A) Mild steel (B) Dead mild steel (C) Medium carbon steel (D) High carbon stee
Last Answer : (D) High carbon stee
Description : Mild steel is a/an __________ steel. (A) Low carbon (B) Medium carbon (C) High carbon (D) High alloy
Last Answer : (A) Low carbon
Description : Which of the following has the least value of ultimate tensile strength (UTS)? (A) Medium carbon steel (B) High carbon steel (C) Cast iron (D) Wrought iron Answer: Option C
Last Answer : (C) Cast iron
Description : Ball bearings are, usually, made from (a) low carbon steel (b) high carbon steel (c) medium carbon steel (d) chrome steel
Last Answer : (d) chrome steel
Description : Which of the following has the least value of ultimate tensile strength (UTS)? (A) Medium carbon steel (B) High carbon steel (C) Cast iron (D) Wrought iron
Last Answer : Option B
Description : Medium Carbon steel was carbon content about (A) 0.25 % (B) 0.25 – 0.50 % (C) 0.50 – 1.5 % (D) 2.5 – 4.5 %
Last Answer : (B) 0.25 – 0.50 %
Description : Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if (A) Mass transfer is accompanied by reaction (B ... stagnant medium B (C) Molecular mean free path is high (D) There is equimolar counter diffusion
Last Answer : (D) There is equimolar counter diffusion
Description : Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer coefficient based on the liquid side for dilute systems for the above was estimated to be 4 ... -4 (C) 5.6 10 -3 (D) 8.5 10 -3
Last Answer : (B) 8.5 × 10 -4
Description : In a medium other than air, the electric flux density will be a) Solenoidal b) Curl free c) Irrotational d) Divergent
Last Answer : d) Divergent
Description : In the medium of free space, the divergence of the electric flux density will be a) 1 b) 0 c) -1 d) Infinity
Last Answer : b) 0
Description : The flux density of medium 1 has a normal component of 2.4 units, then the normal component of the flux density in the medium 2 will be a) 1.2 b) 4.8 c) 2.4 d) 0
Last Answer : c) 2.4
Description : Pick up the correct statement from the following: (A) Permeability is a measure of conducting the magnetic lines of force in the material (B) Permeability is a measure of the extent to which magnetic ... magnetic flux density (B) to the field strength of the magnetizing field (D) All of these
Last Answer : Answer: Option D
Description : The core of a transformer (medium size) uses to provide high flux densities (a) diamagnetic (c) ferromagnetic core (b) paramagnetic (d) none of these
Last Answer : The core of transformer is made up colled rolled grain oriented. It is a ferromagnetic material..
Description : Weld decay can be minimized by specifying steel with: a) Higher carbon level b) higher chromium level c) lower carbon level d) lower chromium level
Last Answer : c) lower carbon level
Description : Weld decay occurs in which of the following steel types? a) Carbon/Manganese b) Low alloy c) Any stainless steel d) Austenitic stainless steels
Last Answer : d) Austenitic stainless steels
Description : Which of the following defects is usually associated with the MAG GMAW) welding process when using Dip Transfer? a) Centerline cracking b) Lack of side wall Fusion c) Undercut d) Tungsten inclusions
Last Answer : b) Lack of side wall Fusion
Description : What is the mode of metal transfer for the TIG (GTAW) welding process? a) Spray Transfer b) Globular Transfer c) Dip Transfer d) None of the above
Last Answer : d) None of the above