Coke is produced by__________________?
(A) pulverising coal in inert atmosphere
(B) heating wood in a limited supply of air at temperatures below 300GC
(C) strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
(D) binding the pulverised coal into brick-etts
(D) enriching carbon in the coal
The critical pressure at which latent heat of vaporisation is zero is________________?
(A) 225.65 kgf/cm2
(B) 273 kgf/cm2
(C) 100 kgf/cm2
(D) 1 kgf/cm2
(D) – 1 kgf/cm2
For water, at pressures below atmospheric___________________?
(A) melting point rises slightly and boiling point drops markedly
(B) melting point rises markedly and boiling point drops markedly
(C) melting point drops slightly and boiling point drops markedly
(D) melting point drops slightly and boiling point drops slightly
(D) none of the above
The saturation temperature of steam with increase in pressure increases____________________?
(A) linearly
(B) rapidly first and then slowly
(C) slowly first and then rapidly
(D) inversely
(D) none of the above
Superheating of steam is done at_________________?
(A) constant volume
(B) constant temperature
(C) constant pressure
(D) constant entropy
(D) constant enthaply
Stoichiometric quantity of air is the___________________?
(A) air present in atmosphere at NTP conditions
(B) air required for complete combustion of fuel with no excess air
(C) air required for optimum combustion so as to have reasonable excess air
(D) air required to convert CO into C02
(D) air required to form an explosive mixture
The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?
(A) 0.1 to 0.2 kg
(B) 0.2 to 0.4 kg
(C) 0.6 to 0.8 kg
(D) 1.0 to 1.5 kg
(D) 1.5 to 2 kg
The specific volume of steam with increase in pressure decreases_____________________?
(A) linearly
(B) slowly first and then rapidly
(C) rapidly first and then slowly
(D) inversely
(D) none of the above
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__________________?
(A) Ps-Pa
(B) pa-ps
(C) Pa+P
(D) non of these
In a throttling process_________________?
(A) heat transfer takes place
(B) work is done by the expanding steam
(C) internal energy of steam changes
(D) all of the above
(D) none of the above