⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs301
Coke is produced by__________________?
Apulverising coal in inert atmosphere
Bheating wood in a limited supply of air at temperatures below 300GC
Cstrongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Dbinding the pulverised coal into brick-etts E. enriching carbon in the coal
302
The critical pressure at which latent heat of vaporisation is zero is________________?
A225.65 kgf/cm2
B273 kgf/cm2
C100 kgf/cm2
D1 kgf/cm2 E. – 1 kgf/cm2
303
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 E. none of the above
304
The saturation temperature of steam with increase in pressure increases____________________?
Alinearly
Brapidly first and then slowly
Cslowly first and then rapidly
Dinversely E. none of the above
305
Superheating of steam is done at_________________?
Aconstant volume
Bconstant temperature
Cconstant pressure
Dconstant entropy E. constant enthaply
306
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 E. air required to form an explosive mixture
307
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 E. 1.5 to 2 kg
308
The specific volume of steam with increase in pressure decreases_____________________?
Alinearly
Bslowly first and then rapidly
Crapidly first and then slowly
Dinversely E. none of the above
309
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
310
Heating of dry steam above saturation temperature is known as_____________________?
Aenthalpy
Bsuperheating
Csupersaturation
Dlatent heat E. super tempering