https://www.geekmcq.com/

Engineering :: Heat Engines

111.  During idling in a compression ignition engine the air fuel ratio may be of the order of
A. 30 B. 20
C. 15 D. 10
E. 5    
112.  Free piston engines find application in
A. Compressed air supply B. Mining installations
C. Gas turbines D. Supercharging of diesel engines
E. None of the above    
113.  An average percentage of Carbon and Hydrogen in Petrol may be roughly given as
A. 50% C, 50% H2 B. 85% C, 150% H2
C. 15% C, 85% H2 D. 70% C, 70% H2
E. 60% C, 40% H2    
114.  Paraffins in petrol have the general formula
A. Cn H2n B. Cn H2n + 2
C. Cn H2n - 2 D. Cn H2n - 4
E. Cn Hn    
115.  Vapour lock is
A. Lock of vaporization of fuel to atomspheric pressure B. Excess fuel supply to engine due to faster evaporation
C. Complete or partial stoppage of fuel supply due to vaporisation of fuel in supply steam D. Locking carburettor jets due to vapour pressure
E. Supply of liquid fuel particles to engine in maixture    
116.  Flash point of a liquids is the temperature at which
A. The fuel emits vapours at a rate which produces an inflammable mixture with air B. The fuel spontaneously ignites
C. The fuel ignites with clearly visible flash D. The fuel ignites without a park
E. Fuel vaporises at the prescribed rate    
117.  In gas and petrol engines thermal efficiency may be expected in the range
A. 10 - 15 percent B. 15 to 25 percent
C. 30 to 35 percent D. 50 percent
E. 60 percent    
118.  In diesel engines thermal efficiency may be expected in the range
A. 10 - 15 percent B. 15 to 25 percent
C. 25 to 30 percent D. 35 to 40 percent
E. 50 percent    
119.  Volumetric efficiency of a well designed engine may be in the range
A. 75 to 90 percent B. 50 to 75 percent
C. 40 to 50 percent D. Below 40 percent
E. Below 20 percent    
120.  Scavenging efficiency of a four stroke diesel engine is
A. In the range 80 to 95 percent B. In the range 50 - 80 percent
C. Below 50 percent D. Between 100% and 95%
E. None of the above    

Read more:

© 2012-2024 by GeekMCQ™ Technologies. All Rights Reserved | Copyright | Terms of Use & Privacy Policy

Contact us: info@geekmcq.com