Description : The best material for the core of a transformer is – (1) stainless steel (2) mild steel (3) hard steel (4) soft iron
Last Answer : (4) soft iron Explanation: Iron has a very large magnetic response: it greatly amplifies an applied magnetic field. The transformer's ability to transfer energy depends on the strength of the magnetic ... field is amplified. The input energy can then be lower while still having the same effect.
Description : The joint for soldering is supported by binding wire made of (A) Mild steel (B) Copper (C) Soft iron (D) Stainless steel
Last Answer : Option C
Description : H2SO4 (< 50% concentration) is corrosive to (A) Aluminium, mild steel, stainless steel, concrete & tin (B) Copper, cast iron & high silicon iron (14% Si) (C) Rubber (butyl and hard), silicone rubber & Teflon (D) Glass, graphite, porcelain & stoneware
Last Answer : (A) Aluminium, mild steel, stainless steel, concrete & tin
Description : The material of construction of pressure mills used for squeezing out the juice from sugar cane is (A) Stainless steel (B) Cast iron (C) Mild steel (D) Monel
Last Answer : (B) Cast iron
Description : Most suitable material for high pressure vessel operating at 500 atm. and 500° C is (A) Molybdenum stainless steel (B) 18/8 stainless steel (C) Mild steel (D) High silicon iron (14% Si)
Last Answer : (A) Molybdenum stainless steel
Description : Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system? (A) High silicon iron, silicon rubber ... Mild steel and stainless steel (C) Cast iron, tin and aluminium (D) Copper, nickel and Monel
Last Answer : (A) High silicon iron, silicon rubber, Kel-F and Teflon
Description : __________ is used as a material of construction for the blade of power saw. (A) Wrought iron (B) Stainless steel (C) Mild steel (D) High speed steel
Last Answer : Option D
Description : Pick out the correct statement. (A) Stainless steel is nothing but chromium coated steel (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal (C) ... its temporary distortion under the action of applied stress (D) Rusting of iron is not electrochemical in nature
Last Answer : (B) Hardening of a soft metal can be done by alloying it with another metal or non-metal
Description : Indicate which of the following material does not retain magnetism permanently. (a) Soft iron (b) Stainless steel (e) Hardened steel (d) None of the above
Last Answer : (a) Soft iron
Description : In transformer, the core is made up of soft iron in order to pass the maximum A. flux B. current C. magnetic flux D. voltage
Last Answer : magnetic flux
Description : Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C? (A) Silicone rubber, teflon, porcelain and wood (B) Nickel, monel, stainless steel and graphite (C) Aluminium, copper, high silicon iron (D) Brass, cast iron, mild steel and tin
Last Answer : (D) Brass, cast iron, mild steel and tin
Description : Plate and frame filter press is usually made of (A) Mild steel (B) Cast iron (C) Stainless steel (D) Galvanised iron
Description : Tank furnace used for melting of glass is made of (A) Mild steel (B) Cast iron (C) Refractory blocks (D) Stainless steel
Last Answer : (C) Refractory blocks
Description : The digester of a Gobar gas plant is a (A) Mild steel drum (B) Stainless steel vessel (C) Masonry well (D) Cast iron vessel
Last Answer : (C) Masonry well
Description : 100% H2SO4 at 30°C can't be stored in a vessel made/lined with (A) Cast iron and high silicon iron (B) Mild steel and stainless steel (C) Aluminium, tin and rubber (D) Teflon, glass and porcelain
Last Answer : (C) Aluminium, tin and rubber
Description : Hydrochloric acid absorber in made of (A) Cast iron (B) Mild steel (C) Karbate (D) Stainless steel
Last Answer : (C) Karbate
Description : The 'bomb' in the bomb calorimeter is made of (A) Molybdenum stainless steel (B) Mild steel (C) High silicon iron (14% Si) (D) Copper
Description : The steel used in R.C.C. work is (A) Stainless steel (B) Mild steel (C) High carbon steel (D) Wrought iron
Last Answer : Answer: Option B
Description : The preferred material of construction for storage tanks for 98% sulphuric acid is (A) Aluminium (B) Lead (C) Stainless steel 316 (D) Mild steel
Last Answer : (B) Lead
Description : A mould board of MB plough is made of? a Cast iron b Chilled cast iron c Mild steel d Soft centre steel
Last Answer : d Soft centre steel
Description : Mould board are usually made from a. Soft centre steel b. Hardened carbon steel c. Chilled cast iron d. Mild steel
Last Answer : a. Soft centre steel
Description : Which of the following metals is used in the electromagnets? (a) Soft iron (b) Stainless steel (c) Cobalt (d) Copper
Last Answer : Ans:(a)
Description : Pick out the wrong statement. (A) A ferromagnetic material becomes paramagnetic above the 'Curie temperature' (B) Permanent magnets are made of hard materials, whereas electromagnets require soft ... hysterisis loss and coercive forces (D) Tungsten steel and alnico are not hard magnetic materials
Description : Mild steel is (A) A low carbon steel (0.05 to 0.3% carbon) (B) Highly resistant to corrosion (as much as stainless steel) (C) A high carbon steel (0.5 to 1.5% carbon) (D) Very poor in strength & ductility
Last Answer : (A) A low carbon steel (0.05 to 0.3% carbon)
Description : Dies for wire drawing are generally made of (A) Mild steel (B) Stainless steel (C) Carbides (D) High carbon stee
Last Answer : (C) Carbides
Description : Gas holder of a gobar (cow-dung) gas plant is made of (A) Molybdenum stainless steel (B) Tin (C) Mild steel (D) Aluminium
Last Answer : (C) Mild steel
Description : In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of (A) Stainless steel (B) Mild steel (C) High speed steel (D) High carbon steel
Last Answer : (C) High speed steel
Description : Dies for wire drawing are generally made of (A) Mild steel (B) Stainless steel (C) Carbides (D) High carbon steel
Last Answer : (A) Mild steel
Description : The steel generally used in R.C.C. work, is (A) Stainless (B) Mild steel (C) High carbon steel (D) High tension steel
Description : The steel used for the manufacture of rails, is (A) Bessemer steel (B) Mild steel (C) Cast steel (D) Stainless steel
Last Answer : Answer: Option A
Description : The steel used in steel cored conductors is usually (a) alloy steel (b) stainless steel (c) mild steel (d) high speed steel (e) all of the above
Last Answer : (c) mild steel
Description : Case hardening of a material is (A) Followed by tempering or carburising (B) Preceded by its tempering (C) Done to get a soft ductile interior with a very hard surface (D) Carried out to get extreme hardness in its core
Last Answer : (D) Carried out to get extreme hardness in its core
Description : Alloy steel containing chromium to resist rusting is known as (a) wrought iron (b) cast iron (c) hard steel (d) stainless steel
Last Answer : Ans:(d)
Description : Alloy steel containing chromium, to resist rusting, is known as (a) Wrought iron (b) Cast iron (c) Hard steel (d) Stainless steel
Description : Sulphur melting pit in the sulphuric acid plant is made of (A) Lead lined stainless steel (B) Cast iron (C) Steel or cement-brick lined (D) Hard wood
Last Answer : (C) Steel or cement-brick lined
Description : For hard facing base alloys used are a) high carbon steel b) high carbon iron c) carbon steel d) stainless steel
Last Answer : b) high carbon iron
Description : In SO3 absorber (Contact Process), packing material used is of (A) Cast iron (B) Chemical stoneware (C) Karbate (D) Mild steel
Last Answer : (B) Chemical stoneware
Description : - Material used for hand slide is (a) chilled cast iron. (b) cast iron (c) mild steel. (d) gun metal
Description : 46 The core used in high frequency transformer is usually A. Copper core B. Cost iron core C. Air core D.Mid steel core
Last Answer : C. Air core
Description : Specify the material of construction suitable for handling concentrated HNO3 at 100°C. (A) High silicon iron, Kel-F and Teflon (B) Tin and wood (C) Silicone rubber (D) Stainless steel
Last Answer : (A) High silicon iron, Kel-F and Teflon
Description : For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is (A) Stainless steel (B) Cast iron (C) Aluminium (D) Nickel
Description : Material of construction of pipe generally used for conveying water in India is (A) Stainless steel (B) Cast iron (C) Wrought iron (D) Lead lined steel
Description : Aqueous nitric acid is stored in __________ vessel. (A) Plain carbon steel (B) Stainless steel (C) Cast iron (D) Thermosetting plastic material
Last Answer : (C) Cast iron
Description : Which material is suitable for shaft material? a. High speed steel b. Stainless steel or high carbon steel c. Grey cast iron d. Steel having approx. 0.4% carbon and 0.8% manganese
Last Answer : d. Steel having approx. 0.4% carbon and 0.8% manganese
Description : Draw B-H curve for magnetic material and state its nature. State the significance of hysteresis loop. Also draw the hysteresis loop for hard steel and soft steel.
Last Answer : B-H curve for magnetic material: The B-H curve is the graphical representation of relation between flux density (B) and applied field strength (H), with H plotted on the x-axis and B plotted on ... or crossing an air gap tends to bulge outwards the iron ring, this effect is called as Fringing .
Description : Draw Hysteresis loop for Hard steel and soft steel. Also write one application of each material.
Last Answer : Application of Hard steel: Fig. (a) Shows hysteresis loop for hard steel. Such materials are used for producing permanent magnets. Such a hysteresis loop represents a large residual ... Residual flux & coercive force are less. Hence material can be used for making the electromagnets.
Description : Ratio of voltages is inverse ratio of the A. transformer B. resistor C. iron core D. current
Last Answer : current
Description : Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron
Last Answer : (4) Soft iron Explanation: Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.
Description : Electromagnet is constructed with which of the following? (1) Steel (2) Soft Iron (3) Aluminium (4) Nickel
Last Answer : (2) Soft Iron Explanation: An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. It is made of soft iron since it has the property of losing its magnetism very quickly.
Description : Electromagnet is constructed with which of the following ? (1) Steel (2) Soft Iron (3) Aluminium (4) Nickel
Last Answer : Soft Iron