Mechanical Engineering MCQs

Page No. 157

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


akcal/kg m2 °C

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bkcal-m/hr m2 °C

✓


ckcal/hr m2 °C

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dkcal-m/hr °C

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View Answer kcal-m/hr m2 °C

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


aincreases

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bdecreases

✓


cremains constant

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dmay increase or decrease depending on temperature

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View Answer decreases

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


aincrease

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bdecrease

✓


cremain unaffected

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dmay increase/decrease depending on temperature and thickness of insulation

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View Answer decrease

Heat is closely related with___________________?


aliquids

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benergy

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ctemperature

✓


dentropy

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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

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bconvection

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cradiation

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dconduction and convection

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View Answer radiation

Heat transfer takes place as per ________________?


azeroth law of thermodynamics

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bfirst law of thermodynamic

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csecond law of the thermodynamics

✓


dKirchoff’s law E. Stefan’s law

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


acentrifugal

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baxial

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creciprocation

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delectromagnetic

✓


View Answer electromagnetic

A boiling water reactor uses following as fuel________________?


aenriched uranium

✓


bplutonium

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cthorium

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dU

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View Answer enriched uranium

In nuclear fission___________________?


athe original elements change into completely different elements

✓


bthe electrons of the element change

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cthe molecules rearrange themselves to form other molecules

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dnone of the above

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For economical operation of a nuclear plant__________________?


aused fuel should be reprocessed

✓


bmoderator should be used

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ccoolant should be employed

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dcontrol rods should be used

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