Mechanical Engineering MCQs

Page No. 157

Unit of thermal conductivity in M.K.S. units is ___________________?


akcal/kg m2 °C


bkcal-m/hr m2 °C


ckcal/hr m2 °C


dkcal-m/hr °C


View Answer kcal-m/hr m2 °C

Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?


aincreases


bdecreases


cremains constant


dmay increase or decrease depending on temperature


View Answer decreases

The insulation ability of an insulator with the presence of moisture would_________________?


aincrease


bdecrease


cremain unaffected


dmay increase/decrease depending on temperature and thickness of insulation


View Answer decrease

Heat is closely related with___________________?


aliquids


benergy


ctemperature


dentropy


View Answer temperature

When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?


aconduction


bconvection


cradiation


dconduction and convection


View Answer radiation

Heat transfer takes place as per ________________?


azeroth law of thermodynamics


bfirst law of thermodynamic


csecond law of the thermodynamics


dKirchoff’s law E. Stefan’s law



Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal_________________?


acentrifugal


baxial


creciprocation


delectromagnetic


View Answer electromagnetic

A boiling water reactor uses following as fuel________________?


aenriched uranium


bplutonium


cthorium


dU


View Answer enriched uranium

In nuclear fission___________________?


athe original elements change into completely different elements


bthe electrons of the element change


cthe molecules rearrange themselves to form other molecules


dnone of the above



For economical operation of a nuclear plant__________________?


aused fuel should be reprocessed


bmoderator should be used


ccoolant should be employed


dcontrol rods should be used



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