D. Below the melting point of either metal. Melting point of steel: 1425-1540 °C / 2600-2800 °F Melting point of gold: 1064 °C / 1947.5 °F Melting point of copper: 1084 °C / 1983 °F Melting point of iron: 1538 °C / 2800 °F Melting point of lead: 327.5 °C / 621 °F Melting point of silver: 961 °C / 1761 °F A 50-Hz alternator will run at the greatest possible speed if it is wound for ....... poles. What is sharp melting point ? Bauschinger effect (a) Hysteresis loss during loading and unloading (b) Anelastic deformation (c) Dependence of yield stress on path and direction (d) None 10. (a) Material properties (b) Design & Dimensions (c) Both (d) None 2. (c) ferromagnetic. # Creep value of which of the following is the highest ? The melting point of copper is (a) 630°C. You may also read • Why all the voltage levels are multiples of 11 kV? WhatsApp. Answer            A, 12. A. 1. In Electro discharge machining, materials with low melting point have which type of surface roughness? Which of the following material has least melting point? 5. A single-stack, 4-phase, 6-pole VR stepper motor will have a step angle of (a) 15º (b) 30º (c) 45º (d) 90º 2. Therefore at the melting point, liquid gets converted in to solid during cooling. asked by varuWhat is the difference between Earthing and Grounding? When the temperature of a magnetic material is increased above the curie point, it become (a) paramagnetic. Micro hardness test is used to measure hardness of thin brittle materials. 3. … (b) 865°C. (a) 60º (b) 45º (c) 30º (d) 15º 6. (d) silver. a) Rough b) Smooth c) Fine d) All of the mentioned Answer: a (a) 36 (b) 24 (c) 18 (d) 12 4. Dental Materials Dental Materials Mcqs for preparation. (d) Brass. MCQ Questions for Class 8 Science with Answers are prepared as per the Latest Exam Pattern. Rancidity of lipids of lipid rich food stuffs is due to: a. Hydrogenation of unsaturated fatty acids. Excessive spatter, under cutting along edges, irregular deposits, wasted electrodes. (c) Brass. Failure due to excessive deformation is controlled by ______________. (a) A, Junior Engineer Exams (SSC, RRB, PSU, State). Which of the following material has highest melting point? (a) copper. MCQ Questions for Class 7 Science: Ch 14 Electric Current and Its effects ... High melting point (b) Low melting point (c) Low boiling point ... (b) Low melting point. (c) Bakelite. 12. 1) You isolated the following compounds in lab and observed the melting points in the table below. K C.200? (c) Nickel. (a) KCl. (d) non-magnetic. Above that of the low fusing metal. Tweet. Melting points of common materials. (a) 140 (b) 80 (c) 20 (d) 40. Welding - Welding objective questions and answers. a. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. A material is known as allotropic or polymorphic if it (a) has a fixed structure under all conditions (b) exists in several crystal forms at … (a) Transformer oil. K D.2730.16? (a) Platinum. A 100% Adfree website for GATE, IES, AMIE and Junior Engineer (SSC, RRB) Exams. Tungsten, rhenium, osmium, tantalum, and molybdenum are among the highest melting point metals. What is the step angle of a permanent-magnet stepper motor having 8 stator poles and 4 rotor poles ? Page-5 section-2 Learn Engineering Materials MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. (d) Silicon oxide. This is the Multiples Choice Questions in Engineering Materials Part 2 of the Series as one of the General Engineering and Applied Sciences (GEAS) topic. 3m high b. is .......hertz. Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals with Answers Pdf free download is available here. 5. Which of the following material has highest melting point? Share. (b) mercury. Too slow welding speed in arc welding would result in....... B. (c) remain same. Thermodynamically, both liquid and solid have equal energy at melting point and therefore both are equally stable at melting point. The melting point of the filler metal in brazing should be above....... 32. 31. 2) Which of the following statements is/are false? Engineering Materials MCQ question is the important chapter for a Mechanical Engineering and GATE students. (B) … K B.100? Which of the following material has highest melting point? Three-phase alternators are invariably Y-connected because (a) magnetic losses are minimised (b) less turns of wire are required (c) smaller conductors can be used (d) higher terminal voltage is obtained. Take the Quiz and improve your overall General Knowledge. Usually materials with following crystal structure fail in ductile mode (a) FCC (b) BCC (c) HCP (d) None 6. 2. (c) Radiant heating. (c) copper. Answer            B, 2. 6. In a three-stack 12/8-pole VR motor, the rotor pole pitch is (a) 15º (b) 30º (c) 45º (d) 60º 3. Fracture stress (σf) is proportional to (a) crack length (b) 1/crack length (c) (crac, 1. Shape of true stress-strain curve for a material depends on (a) mechanical (b) electrical (c) analogue (d) incremental 7. Working principle of air blast circuit breaker. Answer            D, 7. What is the empirical formula to calculate the number of strands? (d) 1365°C. Mcq Added by: admin. Answer            C, 5. 1063° centigrade B. asked by BahuWhat is the function of a choke in tube light? (d) Eddy current heating. Melting point of a solid is said to be sharp if it melts completely within … Share. Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making. Ans: c. 16. (a) 8 (b) 6 (c) 4 (d) 2. Answer            A, 6. 1. (c) Indirect arc heating. Fracture voids usually form at (a) Inclusions (b) Second phase particles (c) Grain boundary triple points (d) All 8. Answer            C, 13. (b) Direct arc heating. Which of the following material is used to made up the lighting arrester? (a) 60 (b) 7200 (c) 120 (d) 450. In case of lime mortar masonry, maximum height should not be more than. (b) HCl. (b) Cobalt. A.0? 3. This transformation of liquid into solid below melting point is known as solidification. B. above the melting point of either metal. Whereas, in the case of symmetrical neopentane molecules, the melting point is higher. Which of the following material is used to made up the lighting arrester? Which method can be used for heating of a non conducting material? The melting point of a substance is the Which of the following is a superconductor material? 18. (b) Cobalt. Which method of heating can be used for a non ferrous material? View Answer / Hide Answer. 14. Shape of true stress-strain curve for a material depends on 15. Failure due to excessive deformation is controlled by ______________. Answer            D, 3. Which of the following material has least value of dielectric strength? (b) diamagnetic. Which of the following material has least value of dielectric constant? That's about two-thirds the temperature at the surface of the sun and 200 K higher than the highest melting point … 19. Check the below NCERT MCQ Questions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals with Answers Pdf free download. 3n (n+1) + 2. c. 3n (n+1) + 1. d. 3n (3+ 3n) + 1. Which method of heating can be used for a non ferrous material? Melting Point of Materials. In general, melting is a phase change of a substance from the solid to the liquid phase. Materials with strong bonds between atoms will have a high melting temperature. 1. Note that, these points are associated with the standard atmospheric pressure. Time dependent yield is known as (a) Fracture (b) Fatigue (c) Buckling (d) Creep 4. Brittle fracture is more dangerous than ductile fracture because _______________. Answer            A. The material which have maximum ductility is (a) mild steel. If an alternator winding has a fraction, 1. In case of hydraulic lime maximum time should be; a. Answer            D, 8. # A true eutectic alloy has melting point: A. 3n (n+2n) + 2. b. • Why Motor rated in kW instead of kVA? The consideration of high melting point is important also for resistance materials used in electrical heating devices like room heaters, furnaces, etc. (c) aluminium and zinc. (b) above melting point (c) between 1400°C and 1539°C (c) between 910°C and 1400°C (e) none of the above. (b) copper and zinc. Which of the following material has least melting point? 2 hours c. 6 hours d. 24 hours. For each compound, look up the melting point in the Tables in the Handbook (or see the online Chemical Information page) and judge the purity of the compound. Students can solve these Materials: Metals and Non-Metals Class 8 MCQs Questions with Answers and assess their preparation … 8. K Related posts: The phenomenon of boiling the milk in an open container when milk spills over the vessel is termed as If the bubbles formed on a submerged hot surface get absorbed in the mass of liquid, the process of boiling is termed as The … Learn Engineering Materials MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Answer            B, « BACK                                        NEXT », Also Read :Why all the voltage levels are multiples of 11 kV? (a) Yield strength (b) Tensile strength (c) Young’s modulus (d) All 3. Ball indenter in Rockwell hardness test is made of diamond. (b) dielectric material. Answer            A, 15. (b) Lead. Operation of stepping motors at high speeds is referred to as (a) fast forward (b) slewing (c) inching (d) jogging 8. Melting Point Technique Quiz. 8. Computations show that a material made with just the right amounts of hafnium, nitrogen, and carbon would have a melting point of more than 4400 K (7460°F). b) The melting point of the mixture is lower than the melting points of either of the individual compounds c) One compound is in the liquid phase whilst the other is in the solid phase d) It always occurs when the ratio of compound A to compound B is 50:50 Explanation: No explanation is available for this question! The temperature of land rises more quickly than that of the sea because the specific heat of soil is Of all metals in pure form, tungsten has the highest melting point (3422 °C, 6192 °F), lowest vapor pressure (at temperatures above 1650 °C, 3000 °F), and the … (c) Brass. Wire carrying current produce attracts the magnetic material due to (a) Magnetic field (b) Chemical effect (c) Heating effect (d) All of these (a) Magnetic field. If a hybrid stepper motor has a rotor pitch of 36º and a step angle of 9º, the number of its phases must be (a) 4 (b) 2 (c) 3 (d) 6 5. b. Which of the following is a superconductor material? Another point is if all the other factors are equal, smaller molecules' melting point will be lower. Brale indenter in Rockwell hardness test is made of diamond. Which of the following phase switching sequence represents half-step operation of a VR stepper motor ? (c) 1084°C. The material which have maximum ductility is. What is the number of rotor teeth in each stack ? C. Below that of the high fusing metal. What is the difference between Earthing and Grounding? 5. (adsbygoogle=window.adsbygoogle||[]).push({}); 1. (d) aluminium and tin. (a) Dielectric heating. MCQs on Dental Materials : Amalgams Part 3. (d) Steel. (a) No warning sign (b) Crack propagates at very high speeds (c) No need for extra stress during crack propagation (d) All 7. See also: Melting Points – Periodic Table. No Tendency for Oxidation : Materials used as high resistance elements in heating appliances should be able to withstand high temperature for a long time without oxidation. 8. (a) Platinum. 11. Which of the following is a mesomorphous material? The melting point of a material is primarily related to bond strength. However, other factors--such as crystal structure, atomic weight, and electron structure--can also influence the melting point. (b) Aluminium. Answer            B, 11. Bauschinger effect (a) Hysteresis loss during loading and unloading (b) Anelastic deformation (c) Dependence of yield stress on path and direction (d) None 10. 6. # A true eutectic alloy has melting point: A. Time dependent permanent deformation is called ________________. d) High Answer: d Clarification: In Electro discharge machining, materials having low melting point have high material removal rates and vice-versa. (d) Mica. MCQs: As the impurities are oxidised, the melting point of iron? 6. The melting point of silver is_____? asked by Guma. 4. Cleavage fracture appears (a) Bright (b) Dull (c) Difficult to identify (d) None 5. a) Melting point of fatty acids decreases with increase in degree of saturation b) Lipids in tissues that are subjected to cooling are more unsaturated c) Naturally occurring unsaturated long-chain fatty acids are nearlyTrans-configuration d) The membrane lipids contain mostly unsaturated fatty acids 960° Centigrade C. 850° Centrigrade D. 1123° Centrigrade. 1. Solidification of Metals 1. (c) gold. The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 is short-pitched by ....... degrees. 2m high c. 1.5 m high d. 2.5 m high. Top 10 Materials with the Highest Melting Point in the World 4 hours b. For instance, ethanol melts at -114.1 degrees, while the bigger ethyl cellulose molecule's melting point … Above that of the low fusing metal B. above the melting point of either metal C. Below that of the high fusing metal D. Below the melting point of either metal www.dentaldevotee.blogspot.com 106. If the amount of carbon content is reduced, the melting point of steel is (a) increases. These Mcqs are helpful for Medical students. Answer            C, 14. Which of the following are not ionic compounds? We have provided Materials: Metals and Non-Metals Class 8 Science MCQs Questions with Answers to help students understand the concept very well. A three-stack VR stepper motor has a step angle of 10º. 2.1 Which of the following materials has maximum strength (a) grey cast iron (b) plain carbon steel (c) alloy steel (d) aluminium alloy 2.2 Which of the following materials has maximum ductility (a) grey cast iron b) mild steel (c) alloy steel (d) high … Answer: c. 3n ( n+1 ) + 1 ( adsbygoogle=window.adsbygoogle|| [ ] ).push ( { } ) 1. Motor rated in kW instead of kVA for the over head conductor is copper 1 You. ) Yield strength ( b ) Design & Dimensions ( c ) (! 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