Mechanical Engineering MCQs

Page No. 102

Solids and liquids have___________________?


aone value of specific heat (ft) two values of specific heat


bthree values of specific heat


cno value of specific heat


done value under some conditions and two values under other conditions



The index of compression n tends to reach ratio of specific heats y when____________________?


aflow is uniform and steady


bprocess is isentropic


cprocess is isothermal


dprocess is isentropic and specific heat does not change with temperature



The term N.T.P. stands for________________________?


anominal temperature and pressure


bnatural temperature and pressure


cnormal temperature and pressure


dnormal thermodynamic practice



In an isothermal process, the internal energy of gas molecules________________?


aincreases


bdecreases


cremains constant


dmay increase/decrease depending on the properties of gas


View Answer remains constant

If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be__________________?


a80°C


b0°C


c40°C


d20°C


View Answer 0°C

One watt is equal to__________________?


a1 Nm/s


b1 N/mt


c1 Nm/hr


d1 kNm/hr


View Answer 1 Nm/s

For which of the following substances, the gas laws can be used with minimum error_________________?


adry steam


bwet steam


csaturated steam


dsuperheated steam


View Answer superheated steam

The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is______________________?


a29.27 kgfm/mol°K


b8314kgfm/mol°K


c848kgfm/mol°K


d427kgfm/mol°K


View Answer 848kgfm/mol°K

Universal gas constant is defined as equal to product of the molecular weight of the gas and_______________?


aspecific heat at constant pressure


bspecific heat at constant volume


cratio of two specific heats


dgas constant


View Answer gas constant

For which of the following substances, the internal energy and enthalpy are the functions of temperature only____________________?


aany gas


bsaturated steam


cwater


dperfect gas


View Answer perfect gas

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