Description : Stainless steel is welded using (A) Oxy-acetylene flame (B) Oxy-hydrogen flame (C) Arc welding (D) Inert gas arc welding
Last Answer : (D) Inert gas arc welding
Description : Pick out the wrong statement. (A) Seam welding, projection welding & spot welding are the classification of electrical resistance welding (B) Electrode tip in spot welding is of copper and the ... joined are overlapped and placed between two electrodes (D) Mild steel sheet cannot be spot welded
Last Answer : (D) Mild steel sheet cannot be spot welded
Description : Rails in the field are generally welded by using a) Thermit welding b) Gas welding c) Electric arc welding d) Forge welding
Last Answer : a) Thermit welding
Description : Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3. (A) 0.5 (B) 1 (C) 1/3 (D) 2.5
Last Answer : Option D
Description : 99.5% purity oxygen is used in (A) Cutting and welding by oxy-acetylene flame (B) Hospitals for medicinal purposes (C) Gas masks and artificial breathing apparatus (D) All (A), (B), and (C)
Last Answer : (D) All (A), (B), and (C)
Description : Thermit welding is categorised as the __________ welding. (A) Forge (B) Fusion (C) Resistance (D) Arc
Last Answer : (B) Fusion
Description : Consumable electrodes are used in the __________ welding. (A) Gas (B) Arc (C) Thermit (D) Resistance
Last Answer : (B) Arc
Description : Projection welding & stud welding is categorised as the __________ welding. (A) Pressure (B) Thermit (C) Resistance (D) Arc
Last Answer : C) Resistance
Description : Describe in brief the equipments required for oxy-acetylene welding.
Last Answer : The following equipments are required for oxy-acetylene welding. 1. Welding torch or Blowpipe: It is the tool for mixing two gases in the desired volumes and burning the mixture at the end of a ... particularly when the oxides of the base metal have a higher melting point than the metal itself.
Description : List types of welding flames used in Oxy-acetylene welding. Write their characteristics and applications.
Last Answer : Types of Flames: Characteristics Applications. 1)Neutral Flame: When oxygen and acetylene are supplied to the torch in nearly equal volumes, a neutral flame is produced. It has two ... cone of whitish colour. 3) Bluish outer cone High Carbon Steel, non - ferrous alloys,
Description : Thermit welding uses the following energy source. (A) Electrical energy (B) Chemical energy (C) Energy of high velocity electrons (D) Heat generated by friction
Last Answer : (B) Chemical energy
Description : Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines? (A) Silicon steel (B) Chromium steel (C) Molybdenum steel (D) None of these
Last Answer : (A) Silicon steel
Description : Corrosion resistance of steel is increased by the addition of (A) Phosphorous and tungsten (B) Nickel and chromium (C) Lead and vanadium (D) Molybdenum and tungsten
Last Answer : (B) Nickel and chromium
Description : __________ can replace tungsten in high speed steel, (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum
Last Answer : (D) Molybdenum
Description : __________ can replace tungsten in high speed steel. (A) Chromium (B) Vanadium (C) Cobalt (D) Molybdenum
Last Answer : (C) Cobalt
Description : Nickel and __________ are the alloying element added in steel to increase its toughness. (A) Molybdenum (B) Chromium (C) Vanadium (D) Silicon
Description : While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C. (A) 1800 (B) 2000 (C) 2400 (D) 3000
Last Answer : (B) 2000
Description : Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal. (A) Burning (B) Intensive oxidation (C) Evaporation (D) None of these
Last Answer : Option B
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 : Which of the following alloying elements is present in maximum percentage in high speed steel? (A) Molybdenum (B) Chromium (C) Tungsten (D) Vanadium
Last Answer : (C) Tungsten
Description : 18/8 stainless steel means, that it contains (A) 18% chromium and 8% nickel (B) 18% chromium and 8% molybdenum (C) 18% nickel and 8% chromium (D) 18% molybdenum and 8% chromium
Last Answer : (A) 18% chromium and 8% nickel
Last Answer : (A) Molybdenum
Description : Which of the following is not a principal alloying element for the structural steel? (A) Molybdenum (B) Nickel (C) Manganese (D) Chromium
Description : All of the following alloying elements of steel increases hardness but sacrifice ductility, except (A) Nickel (B) Vanadium (C) Molybdenum (D) Chromium
Last Answer : (A) Nickel
Description : Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are: (A) Nickel, cobalt & chromium (B) Tungsten, chromium & cobalt (C) Manganese, chromium & cobalt (D) Tungsten, molybdenum & nickel
Description : Stainless steel is welded with difficulty because of (A) Its high melting temperature (B) Chances of cracking (C) Oxide film formation (D) Chromium carbide formation
Last Answer : Option C
Description : Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are (A) Cobalt, chromium & tungsten (B) Cobalt, chromium & nickel (C) Molybdenum, tungsten & chromium (D) Cobalt, zirconium & molybdenum
Last Answer : : Option A
Description : The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm. (A) 0.5 (B) 3 (C) 10 (D) 25
Last Answer : (B) 3
Description : Oxygen cylinders used for autogenous (cutting/welding) purposes are (A) Seamless & made of steel (B) Heat treated before use (C) Made by sand casting (D) Welded steel cylinders
Last Answer : Option A
Description : Entire cell is enclosed by a steel casing that is protected usually by _____ and _____. • Nickel, chromium • Chromium, molybdenum • Aluminium, molybdenum • Nickel, aluminium
Last Answer : • Chromium, molybdenum
Description : Explain the effect of nickel, chromium, silicon, molybdenum addition on the properties of steel.
Last Answer : 1) Effect of Nickel as alloying Element: i) Provides toughness, corrosion resistance, and deep hardening. ii) Increases resistance to impact iii ) Improves tensile strength 2. Effect ... temper brittleness. iv) increases strength. V0 Mo-carbides help increase creepresistance at elevated temps
Description : State the effects of chromium and molybdenum on the properties of steel.
Last Answer : 1) Chromium: i) It improves Ductility ii) It is added in different proportions upto 18 % iii) Below 1.5 % addition increases Tensile Strength iv) 12 % addition gives high ... iii) It improves Thermal Resistance iv) It gives ability to maintain Mechanical Properties at Elevated Temperatures
Description : The temperature of oxy-acetylene flame is around (1) 2800°C (2) 3200°C (3) 4000°C (4) 1500°C
Last Answer : 3200°C
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 : Steel is welded using the __________ flame. (A) Carburising (B) Neutral (C) Oxidising (D) All (A), (B) & (C)
Description : Chromel (Nichrome) is an alloy of (A) Chromium and molybdenum (B) Nickel and chromium (C) Molybdenum and nickel (D) Chromium and aluminium
Description : Which of the following has no effect on the carbide forming tendency insteels? (A) Molybdenum (B) Phosphorus (C) Chromium (D) Vanadium
Last Answer : (B) Phosphorus
Description : Cassiterite is an ore of (A) Tin (B) Lead (C) Molybdenum (D) Chromium
Last Answer : (A) Tin
Description : 'Utilities' in a chemical process plant includes compressed air, steam, water, electrical power, oxygen, acetylene, fuel gases etc. Utility costs for ordinary chemical process plants ranges roughly from __________ percent of the total product ... 1 to 5 (B) 10 to 20 (C) 25 to 35 (D) 35 to 45
Last Answer : (B) 10 to 20
Description : Which of the following mainly decides the current to be employed is arc welding? (A) Electrode size (B) Plate thickness (C) Voltage across the arc (D) Welded portion length
Last Answer : (A) Electrode size
Description : A trace element having antioxidant function is (A) Selenium (B) Tocopherol (C) Chromium (D) Molybdenum
Last Answer : Answer : A
Description : Wilson’s disease is a condition of toxicosis of (A) Iron (B) Copper (C) Chromium (D) Molybdenum
Last Answer : Answer : B
Description : Hypersil' is a __________ steel. (A) High speed (B) Silicon (C) Molybdenum (D) Tungsten
Last Answer : (B) Silicon
Description : The resistance wire used in a hot wire anemometer for conducting electrical current is made of (A) Copper (B) Tungsten (C) Chromium (D) Aluminium
Last Answer : (B) Tungsten
Description : In gas welding which of the following is generally used? a) Oxygen-Hydrogen b) Oxygen-Acetylene c) Oxygen-Hydrogen or Oxygen-Acetylene d) None of the mentioned
Last Answer : c) Oxygen-Hydrogen or Oxygen-Acetylene
Description : Acetylene is commonly used in a gas welding torch. Give the molecular formula for acetylene.
Last Answer : ANSWER: C2H2 or HC2H or H2C2
Description : Pick up the incorrect statement (A) The cross-sectional area of the welded member is effective (B) A welded joint develops strength of its parent metal (C) Welded joints provide rigidity (D) Welding takes more time than riveting
Last Answer : (D) Welding takes more time than riveting
Description : Rails used for A T Welding shall not normally be welded? (i) 20 years old . (ii) 30 years old (iii) 40 years old (iv) 50 years old*
Last Answer : iv) 50 years old*
Description : In electrical resistance welding, distortion results from the use of improper (A) Clamping methods (B) Electrodes (C) Current (D) Filler material
Last Answer : (A) Clamping methods
Description : Larger length & diameter water pipes are made by (A) Electrical resistance welding (B) Die casting (C) Semi-centrifugal casting (D) Continuous casting
Last Answer : options A