Mechanical Engineering MCQs

Page No. 180

The ratio of specific weighf/h.p. of gas turbin and I.C engines may be typically of the order of_______________________?


a1 : 1

✖


b2 : 1

✖


c4 : 1

✖


d1 : 6

✓


View Answer 1 : 6

The thermal efficiency of a gas turbine as compared to a diesel plant is__________________?


asame

✖


bmore

✖


cless

✓


ddepends on other factors

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View Answer less

Gas turbine blades are given a rake___________________?


aequal to zero

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bin the direction of motion of blades

✓


copposite to the direction of motion of blades

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ddepending on the velocity

✖



The air-fuel ratio in gas turbines is of the order of ______________________?


a7 : 1

✖


b15 : 1

✖


c30 : 1

✖


d50: 1

✓


View Answer 50: 1

Mechanical efficiency of gas turbines as compared to I.C engines is____________________?


ahigher

✓


blower

✖


csame

✖


ddepends on on odier considerations

✖


View Answer higher

The fuel consumption in gas turbines is accounted for by___________________?


alower heating value

✓


bhigher heating value

✖


cheating value

✖


dhigher calorific value

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View Answer lower heating value

The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?


alow

✓


bhigh

✖


csame

✖


dlow/high depending on make and type

✖


View Answer low

The work ratio of a gas turbine plant is defined as the ratio of__________________?


anet work output and heat supplied (6) net work output and work done by tur¬bine

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bactual heat drop and isentropic heat drop

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cnet work output and isentropic heat drop

✓


disentropic increase/drop in tempera¬ture and actual increase/ drop in temperature

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Rotary compressors are suitable for ____________________?


alarge discharge at high pressure

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blow discharge at high pressure

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clarge discharge at low pressure

✓


dlow discharge at low pressure

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Gas turbine works on______________?


aBrayton or Atkinson cycle

✓


bCarnot cycle

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cRankine cycle

✖


dErricsson cycle

✖



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