Mechanical Engineering MCQs

Page No. 20

For water, at pressures below atmospheric___________________?


amelting point rises slightly and boiling point drops markedly


bmelting point rises markedly and boiling point drops markedly


cmelting point drops slightly and boiling point drops markedly


dmelting point drops slightly and boiling point drops slightly



The saturation temperature of steam with increase in pressure increases____________________?


alinearly


brapidly first and then slowly


cslowly first and then rapidly


dinversely



Superheating of steam is done at_________________?


aconstant volume


bconstant temperature


cconstant pressure


dconstant entropy


View Answer constant pressure

Stoichiometric quantity of air is the___________________?


aair present in atmosphere at NTP conditions


bair required for complete combustion of fuel with no excess air


cair required for optimum combustion so as to have reasonable excess air


dair required to convert CO into C02



The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?


a0.1 to 0.2 kg


b0.2 to 0.4 kg


c0.6 to 0.8 kg


d1.0 to 1.5 kg


View Answer 0.6 to 0.8 kg

The specific volume of steam with increase in pressure decreases_____________________?


alinearly


bslowly first and then rapidly


crapidly first and then slowly


dinversely



If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton’s law, the pressure in condenser is equal to__________________?


aPs-Pa


bpa-ps


cPa+P


dnon of these


View Answer Pa+P

Heating of dry steam above saturation temperature is known as_____________________?


aenthalpy


bsuperheating


csupersaturation


dlatent heat


View Answer superheating

Carbonation of coal is the process of________________________?


apulverising coal in inert atmosphere


bheating wood in a limited supply of air at temperatures below 300°C


cstrongly heating coal continuously for about 48 hours in the absence of air in a closed vessel


dbinding the pulverised coal into brick-ettes



The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?


aless


bmore


cequal


dmay be less or more depending on temperature


View Answer less

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