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MCQ, Systems in Mechanical Engineering (102003) 2019 Pattern, Unit I: Introduction of energy sources & its conversion, 1. The capacity to do work is called:, A. Heat, B. Energy, C. work, D. none of the above, 2. Heat is measured in:, A. Joule, B. Calorie, C. both A and B, D. Joule/second, Ans: A It is measured in Joule., 3. With the increase in temperature, heat will be:, A. increase, B. constant, C. decrease, D. double, 4. How we measure the energy value of food?, A. Joule, B. Joule/second, C. Calorie, D. none of the above, 5. The amount of heat required to raise the temperature of a substance by 1°C is called:, A. work capacity, B. heat capacity, C. Energy capacity, D. none of the above, 6 . Heat capacity depends on, A. change in temperature, B. Mass of body, C. Nature of substance, D. All the above, 7………………….. is neither created nor destroyed it can only change one form to another., A. work, B. Heat, C. Energy, D. Mass of body, , 8. The amount of heat required to raise the temperature of a substance by …………..

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A. 1°C, B. 1°F, C. 10°C, D. 10°F, 9. Which of the following has the highest heat capacity?, A. Water, B. air, C. soil, D. none of the above, 10. Which of the following are the processes of transfer of heat?, A. Conduction, B. Convection, C. Radiation, D. All the above, 11. The process of transfer of heat in solids is called:, A. Convection, B. Radiation, C. Conduction, D. none of the above, (Ans: C In this process the molecules of the solid pass the heat from one to another,, without themselves moving from their positions.), 12. The temperature at which liquid changes into vapour is called:, A. Melting point, B. boiling point., C. expansion point, D. none of the above, 13. In Conduction process the molecules of the solid pass the heat from one to another:, A. Without themselves moving from their positions., B. themselves move from one place to another, C. without themselves moving from one place to another., D. None of the above, 14. The process of transfer of heat in liquids & gases is called:, A. Conduction, B. Radiation, C. Convection, D. absorption, Ans: C It is the process of transfer of heat in liquids & gases, 15. In convection, the molecules:, A. without themselves moving from their positions., B. themselves move from one place to another, C. without themselves moving from one place to another., D. None of the above, 16. Solids are not heated by convection because:

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A. solid are not free to move from one place to another, B. molecules only vibrate about a fixed position, C. both A and B, D. none of the above, 17. It is the process of heat transfer from a hot body to a colder body without heating the, space between the two is called:, A. Conduction, B. Radiation, C. Convection, D. absorption, 18. At night a current of air blows from the colder land to the warmer sea is called as:, A. Air Breezes, B. Sea Breezes, C. Land Breeze, D. none of the above, 19. The transfer of heat by radiation:, A. Does not require any medium., B. require any medium., C. does not require any space., D. require any space., 20. The air over the land is heated, becomes lighter & rises while the cooler air from the sea, blows towards land to take its place is called as:, A. Land Breeze, B. Sea Breezes, C. air Breezes, D. none of the above, 21. At what factor heat absorbed on radiation by the body depends on?, A. Distance between bodies, B. source of heat, C. its color, D. All the above, 22. The heat of the sun reaches the earth by:, A. Radiation, B. Convection, C. absorption, D. Conduction, 23. The land breeze blows during:, A. day, B. night, C. winter, D. summer, 24. A wooden spoon is dipped in a cup of ice cream. Its other end…, A. becomes cold by the process of radiation.

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B. becomes cold by the process of conduction., C. “does not become cold.”, D. becomes cold by the process of convection., 25. The sea breeze blows during:, A. summer, B. winter, C. day, D. night, 26. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the, process of……………., A. Convection, B. Conduction, C. absorption, D. Radiation, 27. Clothes of …………………, colors absorb heat better than clothes of ………….colors., A. Light, dark, B. Dark, light, C. soft, dark,, D. none of the above, 28. Dark colored clothes are preferred during:, A. Winter, B. day, C. night, D. summer, 29. No medium is required for transfer of heat by the process of :, A. absorption, B. Conduction, C. Radiation, 30. Light coloured clothes are preferred during, A. winter, B. summer, C. day, D. night, 31. Why conduction is only possible in solids:, A. particles of solids are closely packed, B. heat is transferred from the hotter end to the colder end of an object., C. heat is transferred from the colder end to the hotter end of an object., D. both A and B, Ans: D In solids, generally, the heat is transferred by the process of conduction because, particles of solids are closely packed and heat is transferred from the hotter end to the, colder end of an object.

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32. An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will…., A. Not flows from iron ball to water or from water to iron ball., B. Flow from iron ball to water., C. Flow from water to iron ball., D. none of the above, 33. The materials which allow heat to pass through them easily are called:, A. insulators of heat, B. conductors of heat, C. semiconductors of heat, D. none of the above, 34. Stainless steel pans are usually provided with copper bottoms. The reason for this could, be that., A. copper bottom makes the pan more durable., B. such pans appear colourful., C. Copper is a better conductor of heat than stainless steel., D. none of the above, 35. Which of the following is not a requirement for site selection of hydroelectric power, plant?, a) Availability of water, b) Large catchment area, c) Rocky land, d) Sedimentation, D. Convection, 36. The amount of electrical energy that can be generated by a hydroelectric power plant, depends upon ___________, a) Head of water, b) Quantity of water, c) Specific weight of water, d) Efficiency of Alternator, 37. Potential energy of water is used to drive the turbine., a) True, b) Faise, 38. Hydroelectric power plant is __________, a) Non-renewable source of energy, b) Conventional source of energy, c) Non-conventional source of energy, d) Continuous source of energy, 39. Hydroelectric power plant is generally located near load centre., a) True, b) False, 40. Hydroelectric power plant is mainly located in ____________, a) Flat areas, b) Deserts

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c) Hilly areas, d) Deltas, 41. Which statement about hydroelectric power plant is wrong?, a) Efficiency of hydroelectric power plant does not reduce with age, b) Its construction coast is very high and takes a long time for erection., c) It is very neat and clean plant because no smoke or ash is produced., d) Meeting rapidly changing load demands is not possible in hydroelectric power, plant., 42. Which of the following is not an advantage of hydroelectric power plant?, a) No fuel requirement, b) Low running cost, c) Continuous power source, d) No standby losses, 43. Which of the following statement is true about hydroelectric power plant?, a) Hydroelectric power plants are multipurpose., b) Due to non-uniform flow of water frequency control in such plants is very difficult., c) Hydroelectric power plant has high running cost, d) Water is used as fuel in hydroelectric power plant, 44. Which element of hydroelectric power plant prevents the penstock from water hammer, phenomenon?, a) Valves and Gates, b) Draft tubes, c) Spillway, d) Surge Tank, 45. Dam having very wide base as compared to its height is called _________, a) buttress dam, b) arch dam, c) earth dam, d) solid gravity dam, 46. Spillway discharges the overflow water to the downstream side when the reservoir is, full., a) True, b) False, 47. Trash racks are built for ___________, a) discharging the water freely from the turbine exit to tailrace, b) preventing the turbine from ingress of floating and other materials, c) creating artificial head to store sufficient potential energy of water, d) controlling the opening of valves, 48. Penstock in a hydroelectric power plant is _____________, a) a pipe connected to runner outlet, b) nozzle that release high pressure water on turbine blades, c) a conduit connecting forebay to scroll case of turbine, d) a pipe connecting surge tank to dam

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49. The pressure at the inlet or exit of the draft tube should not be _________, a) less than one third of atmospheric pressure, b) greater than one third of atmospheric pressure, c) less than one atmospheric pressure, d) greater than one atmospheric pressure, 50. Draft tube increases the operating head on the turbine., a) True, b) False, 51. Which statement about surge tank is wrong?, a) Ideal location of surge tank is at the turbine inlet, b) A decrease in load demands cause a rise in water level in surge tank, c) Surge tanks are totally closed to avoid entry of unwanted objects to penstock, d) Surge tanks are installed to reduce harm effects of water hammer phenomenon, 52. Trash racks are located _____________, a) near tailrace, b) at the entrance of turbine, c) inside penstock, d) intake, 53. What is the function of booms?, a) It supports the dam, b) it supports the penstock, c) It divert the Icebergs from flowing into the penstock, d) To hold the turbine structure, 54. The cheapest plant in operation and maintenance is......., A. Steam power plant, B. Nuclear power plant, C. Hydro-electric power plant, D. None of the above, , 55. Pelton turbines are mostly........, A. Horizontal, B. Vertical, C. Inclined, D. None of the above, 56. The power output from a hydro-electric power plant depends on three parameters........, A. Head,type and dam of discharge, B. Head, discharge and efficiency of the system, C. Efficiency of the system, type of draft tube and type of turbine used, D. Type of dam, discharge and type of catchment area, 57. The efficiency of a nuclear power plant in comparison to a conventional thermal power, plant is

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(a) same, (b) more, (c) less, (d) may be less or mote depending on size, 58. A nuclear unit becoming critical means, (a) it is generating power to rated capacity, (b) it is capable of generating much more than rated capacity, (c) there is danger of nuclear spread, (d) chain reaction that causes automatic splitting of the fuel nuclei has been, established, 59. Moderator in nuclear plants is used to, (a) Reduce temperature, (b) extract heat from nuclear reaction, (c) control the reaction, (d) cause collision with the fast moving neutrons to reduce their speed, 60. The most commonly used moderator in nuclear plants is, (a) Heavy water, (b) concrete and bricks, (c) graphite and concrete, (d) deuterium, 61. The nuclear energy is measured as, (a) MeV, (b) curie, (c) farads(d) MW, 62. Reflecting mirrors used for exploiting solar energy are called........, A. Mantle, B. Ponds, C. Diffusers, D. Heliostats, 63. The output of solar cell is of the order of........, A. 1 W, B. 5 W, C. 10 W, D. 20 W, 64. Photovoltaic cell or solar cell converts........, A. Thermal energy into electricity, B. Electromagnetic radiation directly into electricity, C. Solar radiation into thermal energy, D. Solar radiation into kinetic energy, 65. Temperature attained by a flat-plate collector is of the........, A. Order of about 900C, B. Range of 1000C to 1500C, C. Above 1500C

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D. None of the above, 66. Solar cells,for power generation,entail the following major disadvantages........, A. Variable power, B. High cost, C. Lack of availability, D. Large area requirement, 67. Largest geothermal plant in operation is in........, A. Maxico, B. Italy, C. Russia, D. California, 68. The process of producing energy by utilizing heat trapped inside the earth surface is, called, _________, a) Hydro-thermal energy, b) Geo-Thermal energy, c) Solar energy, d) Wave energy, 69. Earth‟s outer layer rock is called as __________, a) Mantle, b) Crust, c) Outer core, d) Asthenosphere, 70. How much is the efficiency of geothermal plant?, a) 28%, b) 15%, c) 42%, d) 30%, 71. The geothermal energy is the ________ from the earth., a) Heat, b) Light, c) Photons, d) Protons, 72. What type of energy is wind energy?, a) Renewable energy, b) Non-renewable energy, c) Conventional energy, d) Commercial energy, 73. What are used to turn wind energy into electrical energy?, a) Turbine, b) Generators, c) Yaw motor, d) Blades

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74. Wind energy can be used to, (A) Generate electricity, (B) Operate flour mills, (C) Draw underground water, (D) all of the above, 75. This is also called as a bio gas, (a) bio butanol, (b) biodiesel, (c) bio ethanol, (d) bio methane, 76. Which country has world‟s largest tidal power plant?, a) Netherlands, b) South Korea, c) Laos, d) Bolivia, 77. Reflector in nuclear plants is used to, (a) return the neutrons back into the core, (b) shield the radioactivity completely, (c) check polllution, (d) conserve energy, 78. In nuclear fission each neutron that causes fission releases, (a) no new neutron, (b) at least one new neutron, (c) one new neutron, (d) more than one new neutrons, 79. The process by which a heavy nucleus is splitted into two light nuclei is known as, (a) splitting, (b) fission, (c) fusion, (d) disintegration, 80. Cost of nuclear fuel in nuclear power plant economics is considered as __________, a) running cost, b) maintenance cost, c) capital cost, d) development cost