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Engineering :: Turbo machines

71.  Ljungstrom steam turbine is a
A. radial flow turbine B. axial flow turbine
C. mixed flow turbine D. any of the above
72.  In a modern steam turbine, the steam rte is nearly
A. 1 kg/kWhr B. 2 kg/kWhr
C. 4 kg/kWhr D. 8 kg/kWhr
73.  Which of the following rotary compressor has two shafts?
A. Axial flow compressor B. Sliding vane compressor
C. Centrifugal compressor D. Lobe type compressor
74.  The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called
A. slip factor B. Velocity ratio
C. Blade efficiency D. Diagram efficiency
75.  The following property is the most important for material used for gas turbine blades
A. Fatigue B. Strength against bending
C. Group D. Strength against direct force
76.  Which of the following is the smallest and lighest for generating a given amount of power
A. Steam power plant B. Petrol engine
C. Diesel engine D. Solar plant
E. Gas turbine plant    
77.  Generally, steam turbines in power stations operate at
A. 3000 rpm B. 1500 rpm
C. 1000 rpm D. 375 rpm
E. 50 rpm    
78.  For gas turbine, compressors used are
A. Reciprocating type B. Centrifugal type
C. Axial flow type D. Lobe type
E. Sliding vane type    
79.  De Laval turbine is used for applications requiring
A. High power, high speed B. High power, low speed
C. Low power, high speed D. Low power, low speed
E. Low speed    
80.  As a result of blade friction, the outlet relative velocity of impulse turbine compared to inlet relative velocity is
A. Nearly same B. 2% less
C. 10% - 15% less D. 30% less
E. 50% less    

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