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Electric heating
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Due to which of the following reasons it is desirable to have short arc length ? All of the above [other wrong options] [Discuss in forum] To achieve better heating To increase the life of roof refractory To have better stirring action To reduce problem of oxidation |
Q22 ⇒ Resistance variation method of temperature control is done by connecting resistance elements in all of the above ways [other wrong options] [Discuss in forum] series parallel series-parallel connections star-delta connections |
Q23 ⇒ In direct arc furnace which of the following has high value ? Current [other wrong options] [Discuss in forum] Voltage Power factor All of the above |
Q24 ⇒ Which of the following methods of heating is not dependent on the frequency of supply ? Electric resistance heating [other wrong options] [Discuss in forum] Induction heating Dielectric heating All of the above |
Q25 ⇒ Which of the following insulating materials is suitable for low temperature applications? Diatomaceous earth [other wrong options] [Discuss in forum] Asbestos paper 80 percent magnesia Cork |
Q26 ⇒ Induction furnaces are employed for which of the following? Heat treatment of castings [other wrong options] [Discuss in forum] Heating of insulators Melting aluminium None of the above |
Q27 ⇒ In the indirect resistance heating method, maximum heat-transfer takes place by radiation [other wrong options] [Discuss in forum] convection conduction any of the above |
Q28 ⇒ Hysteresis loss and eddy current loss are used in induction heating of steel [other wrong options] [Discuss in forum] dielectric heating induction heating of brass resistance heating |
Q29 ⇒ When a body reflects entire radiation incident on it, then it is known as white body [other wrong options] [Discuss in forum] grey body black body transparent body |
Q30 ⇒ A non-dimensional number generally associated with natural convection heat transfer is Grashoff number [other wrong options] [Discuss in forum] Prandt1 number Pecekt number Nusselt number |
Q31 ⇒ In an electric room heat convector the method of heating used is resistance heating [other wrong options] [Discuss in forum] arc heating induction heating dielectric heating |
Q32 ⇒ Property of low temperature co-efficient of heating element is desired due to which of the following reasons ? Both (a) and (b) [other wrong options] [Discuss in forum] To avoid initial rush of current To avoid change in kW rating with temperature Either (a) or (b) |
Q33 ⇒ In heating the ferromagnetic material by induction heating, heat is produced due to due to hysteresis loss as well as eddy current loss taking place in the charge [other wrong options] [Discuss in forum] induced current flow through the charge hysteresis loss taking place below curie temperature none of the above factors |
Q34 ⇒ For the transmission of heat from one body to another temperature of the two bodies must be different [other wrong options] [Discuss in forum] both bodies must be solids both bodies must be in contact at least one of the bodies must have some source of heating |
Q35 ⇒ The temperature inside a furnace is usually measured by which of the following? Optical pyrometer [other wrong options] [Discuss in forum] Mercury thermometer Alcohol thermometer Any of the above |
Q36 ⇒ In a domestic cake baking oven the temperature is controlled by series-parallel operation [other wrong options] [Discuss in forum] voltage variation thermostat auto-transformer |
Q37 ⇒ Which of the following methods is used to control temperature in resistance furnaces ? All of the above methods [other wrong options] [Discuss in forum] Variation of resistance Variation of voltage Periodical switching on and off of the supply |
Q38 ⇒ Radiant heating is used for which of the following ? Drying of paints and varnishes [other wrong options] [Discuss in forum] Annealing of metals Melting of ferrous metals Heating of liquids in electric kettle |
Q39 ⇒ ____ has the highest value of thermal conductivity. Copper [other wrong options] [Discuss in forum] Aluminium Brass Steel |
Q40 ⇒ Heat transfer by condition will not occur when temperatures of the two bodies are identical [other wrong options] [Discuss in forum] bodies are kept in vacuum bodies are immersed in water bodies are exposed to thermal radiations |
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