Description : State the purpose of making alloys, with example of each.
Last Answer : The purposes of making an alloy with example: 1. Improve hardness of metal e.g. Pure gold & silver are soft. Hence they are hardened by the addition of a small amount of copper in them. ... but when it is alloyed with mercury to form an alloy called sodium- amalgam , it becomes less reactive.
Description : Define lubricant. Give the classification of lubricants with at least one example of each type.
Last Answer : Lubricant: Any substance introduced between two moving or sliding surface to reduce the frictional resistance between them is known as lubricant. Classification: i) Solid lubricants: Examples: graphite, ... acids like oleic acid, Stearic acid etc., silicones, blended oils, and mineral oils.
Description : Not an example for actuator (a) Optical fiber (b) Shape memory alloys (c) Magneto-strictive materials (d) Electro-/Magneto-rheological fluids
Last Answer : (a) Optical fiber
Description : What is need of level measurement? Give classification of level measurement methods with two examples of each.
Last Answer : In almost all industries, vast quantities of liquid such as water solvents, chemicals etc. are used in number of processes. It is widely employed to monitor as well as measure quantitatively the ... a) Capacitance level indicator b) Radiation level detector c) Ultrasonic level gauge 3. Radar type
Description : Give classification of insulating materials on the basis of state of material and give one application of each.
Last Answer : Classification of Insulating material State of material Application Solid insulating materials Wood, rubber, plastic, PVC, glass, porcelain, mica, Polypropylene film etc. ... Switchgears, gas pressures cables, circuit breakers, generator cooling systems and X-ray apparatus
Description : Give broad classification of maintenance with meaning of each type. State the factors on which ideal maintenance of electric rolling stock is judged. Give any two means to improve any one factor of these.
Last Answer : Ans: Classification: 1) Running repairs - carried out when the equipment has actually failed. 2) Trouble shooting - involves rectification of the defects by making temporary repair so that ... and operating staff , coordination of work at shed , availability of standby and quality spares
Description : Give reason: Metals belonging to the same group form good alloys.
Last Answer : As metals belonging to the same group in the periodic table have similarities in electronic configuration.
Description : List the classification of temperature measuring instruments with one example each.
Last Answer : Classification of temperature measuring instruments with one eg
Description : The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the ... this example? d) Give another example of a set of elements which are classified according to this law.
Last Answer : a) The average atomic mass of X and Z = 7 39 2 46 2 23 b) The average atomic mass of X and Z is equal to the atomic mass of Y c) The law illustrated in this example is Dobereiner’s law of triads. d) Another example of Dobereiner’s law is Calcium, Strontium and Barium.
Description : Give the classification of magnetic materials.
Last Answer : The magnetic behavior of materials can be classified into the following five major groups: 1. Diamagnetism 2. Paramagnetism 3. Ferromagnetism 4. Ferrimagnetism 5. Antiferromagnetism
Description : Define Electrical Installation and give its classification.
Last Answer : Meaning of Electrical installation : Electrical installation is a process of estimation and erection of electrical wiring with materials, and electrical machines used by ... Residential Electrical Installation ii) Commercial Electrical Installation iii) Industrial Electrical Installation
Description : Give the classification of transformer based on: i) Construction ii) Voltage level iii) Number of phases iv) Applications
Last Answer : Classification of transformer based on: i) Construction: Shell type, Core type, Berry type ii) Voltage level: Step-Up, Step-Down, iii) Number of phases: Single phase, Three phase iv) Applications: Power T/F, Distribution T/F
Description : Give the classification of DC generator based on their winding connections.
Last Answer : 1) D.C Shunt Generator 2) D.C Series Generator 3) D.C Compound Generator: i) Cumulative compound generator ii) Differential compound Generator
Description : Give the classification of the errors used in measuring instrument & state the reason for their occurrence.
Last Answer : Types of errors in measuring instruments: A) Gross error: These are due to mistakes on the part of person using the instrument. B) Systematic Error: i) Instrumental Error: These ... multiplying factor. C) Random error: These persist even after gross and systematic errors are removed.
Description : Give classification of resistance based on their ranges.
Last Answer : Classification of Resistances Based on Their Ranges: 1) Low resistance: less than 1 ohm. 2) Medium resistance: 1 ohm to 0.1 Mega ohms. 3) High resistance: greater than 0.1 Mega ohms.
Description : Give meaning of the term defect. State effects of it. Also give classification of it and methods to eliminate them.
Last Answer : Ans: Defect - Failure in a general sense can be regarded as a defect Effects of Defect -Defect results in the reduction of speed or load capacity of the locomotive or which detables the ... taken by manufacturer Defects(2) and (3) can be minimised by restoring to the ideal maintenance practice
Description : Define fuel. Give the classification of fuel based on their occurrence with two examples of each type.
Last Answer : Fuel: A fuel can be defined as any combustible substance which during combustion gives large amount of heat energy. Classification of Fuel : I) Primary or Natural Physical State i) Solid - e.g wood ... diesel oil, lubricating oil iii)Gaseous- e.g LPG, water gas ,producer gas ,coal gas, biogas
Description : What are a list of chemical elements and alloys that can be melted in a typical residential food oven?
Last Answer : I’ve got a slug of a Bismuth Cadmium, Lead, Tin alloy that melts at about 150F , 65C. It melts in hot water. It’s toxic so it’s probably not a good idea to touch it or use kitchen tools.
Description : Are we still creating more alloys?
Last Answer : Alloys aren’t discovered they’re created. Even if they were discovered we’d never know if we were done or not, as you can never know when you’re going to discover something.
Description : Which of the following is used as base material in Selective laser sintering (SLS)? a.Photopolymer b.Thermoplastics, Metal powders c.Titanium alloys d.Various materials
Last Answer : b.Thermoplastics, Metal powders
Description : Which of the following is used as base material in Electron Beam Melting (EBM) process? a.Titanium alloys b.Photopolymer c.Various materials d.Paper
Last Answer : a.Titanium alloys
Description : Which of the following is used as base material in Stereolithography (SLA) process? a.Thermoplastics , Metals powders b.Thermoplastics , Eutectic metals. c.Titanium alloys d.Photopolymer
Last Answer : d.Photopolymer
Last Answer : Copper has two alloys
Description : Where on motor vehicle would aluminium alloys be used?
Last Answer : on the seatbelt.
Description : What are the three characteristics that make steel alloys valuable?
Last Answer : Need answer
Description : Permanent magnet is normally made of- (a) Aluminum (b) Wrought iron (c) Cast iron (d) Alnico alloys
Last Answer : Ans: C
Description : What is used in making of alloys? A. Lime-stone B. Chromium C. Granite D. Gypsum
Last Answer : ANSWER: B
Description : Elements that show the properties of both metals and non-metals are called (a) Allotropes (b) Metalloids (c) Alloys (d) Colloids
Last Answer : Ans:(b)
Description : Alloys in which mercury is one of the metals are called (a) Amalgams (b) Emulsions (c) Mixtures (d) Solders
Last Answer : Ans:(a)
Description : Which one of the following is not a characteristic feature of alloys? They are – (1) Compounds (2) Mixtures (3) Solutions (4) Homogeneous systems
Last Answer : (4) Homogeneous systems Explanation: An alloy is a mixture or metallic solid solution composed of two or more elements. So they are heterogeneous systems. Complete solid solution alloys give ... (heat treatment) history. Alloys usually have different properties from those of the component elements.
Description : Metals, in general are of low strength and do not possess required physio-chemical and technological properties for a definite purpose. Alloys are therefore more than metals alone. Discuss the arrangement of atoms and Structures of alloys.
Last Answer : Alloys are produced by melting or sintering two ore more metals, or metals and a non-metal, together. Alloys possess typical properties inherent in the metallic state. The chemical elements ... an alloy are its individual portions, each having a single structure with its characteristic features.
Description : Which alloys is used for making magnets?
Last Answer : Alnico
Description : High resistance electrical heating elements/wire are not made of (A) Maraging steel (B) Nimonic alloys (C) Kanthal wire (D) Nichrome
Last Answer : (A) Maraging steel
Description : The largest consumption of zinc for alloys is in the making of (A) Bearing metal (B) Brasses (C) Brazing solder
Last Answer : (B) Brasses
Description : Which of the following alloys does not contain nickel? (A) Chlorinet - 2 alloy (B) Monel (C) Inconel (D) Babbitt metal
Last Answer : (D) Babbitt metal
Description : Which of the following alloys does not contain nickel? (A) Chloro, et-2 alloy (B) Monel (C) Inconel (D) Babbitt metal
Description : For platinum thermocouples, lead wires are made of (A) Copper & copper-nickel alloys (B) Copper & iron (C) Iron & nickel (D) Tin & nickel
Last Answer : (A) Copper & copper-nickel alloys
Description : Locomotive boiler tubes are made of __________ alloys. (A) Arsenic copper (B) Magnesium (C) Aluminium (D) Nickel
Last Answer : (A) Arsenic copper
Description : Nickel (76%) and chromium (15%) alloys are termed as (A) Inconel (B) Monel (C) Aluminium bronzes (D) Brass
Last Answer : (A) Inconel
Description : Most suitable material of construction for the storage of concentrated nitric acid is (A) Cast iron (B) Monel (C) Karbate (D) Aluminium or chromium alloys (Cr > 18% for cold acid)
Last Answer : (D) Aluminium or chromium alloys (Cr > 18% for cold acid)
Description : Babbitt metals used for making bearings are (A) Tin or lead based alloys (B) Short of antifrictional properties (C) Having homogenous microstructure (D) Yellow metals
Last Answer : (A) Tin or lead based alloys
Description : Nickel (56%) and molybdenum (17%) alloys are called (A) Monel (B) Hastelloy C (C) Inconel (D) Bronzes
Last Answer : (B) Hastelloy C
Description : The addition of antimony in tin-based alloys improves its (A) Rupture strength and hot hardness (B) Impact strength and bonding strength (C) Deformation resistance (D) Wear resistance
Last Answer : (C) Deformation resistance
Description : Dilute sulphuric acid is transported in __________ pipes. (A) Mild steel (B) Lead (C) Copper (D) Special alloys
Last Answer : (B) Lead
Description : Zinc is not used (A) For producing zinc base die casting alloys (B) In its oxide form as pigments (C) As anode for corrosion prevention in boiler (D) As an alloying element in various bronzes
Last Answer : (D) As an alloying element in various bronzes
Description : Which of the following is not an alloy of nickel and chromium? (A) Inconel (B) Hastelloy (C) Nimonic alloys (D) Duralumin
Last Answer : (D) Duralumin
Description : Monel alloy is (A) The costliest of all the alloys of nickel (B) Not suitable for making kitchen utensils (C) Used for making steam valves and turbine blades as it resists steam attack at high temperature (D) Not used in cast and wrought forms
Last Answer : (C) Used for making steam valves and turbine blades as it resists steam attack at high temperature
Description : Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it. (A) Copper (B) Copper alloys (C) Stainless steel (D) Monel
Last Answer : (C) Stainless steel
Description : Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys. (A) Beryllium (B) Manganese (C) Copper (D) Iron
Last Answer : (B) Manganese
Description : For spinning viscose rayon, the extrusion spinnerettes are made of (A) Platinum or gold alloys (B) High carbon steel (C) Aluminium (D) Nickel
Last Answer : (A) Platinum or gold alloys