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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