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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