Mechanical Engineering MCQs

Page No. 181

The pressure ratio of an ideal vaned compressor with increase in mass flow rate_________________?


aincreases


bdecreases


cremains constant


dfirst decreases and then increases


View Answer remains constant

Actual compression curve is___________________?


asame as isothermal


bsame as adiabatic


cbetter than isothermal and adiabatic


din between isothermal and adiabatic



The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called__________________?


apressure ratio


bpressure coefficient


cdegree of reaction


dslip factor


View Answer degree of reaction

Surging phenomenon in centrifugal com-pressor depends on ___________________? Pick up wrong statement ?


amass flow rate


bpressure ratio


cchange in load


dstagnation pressure at the outlet



Gas turbines for power generaion are normally used___________________?


ato supply base load requirements


bto supply peak load requirements


cto enable start thermal power plant


din emergency



Open cycle gas turbine works on___________________?


aBrayton or Atkinson cycle


bRankine cycle


cCarnot cycle


dErricsson cycle



The work ratio of simple gas turbine cycle depends on_________________?


apressure ratio


bmaximum cycle temperature


cminimum cycle temperature


dall of the above


View Answer all of the above

The vloumetric efficiency of compressor with increase in compression ratio will


aincrease


bdecrease


cremain same


dmay increase/decrease depending on clearance volume


View Answer decrease

Axial flow compressor resembles____________________ ?


acentrifugal pump


breciprocating pump


cturbine


dsliding vane compressor


View Answer turbine

Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm . The air pressure will be_____________________ ?


a1.03 kg/cm2


b1.06 kg/cm2


c1.00 kg/cm2


d0.53 kg/cm2


View Answer 1.00 kg/cm2

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