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Engineering :: Heat Engines

161.  Crankshafts are generally
A. Sand cast B. Die cast
C. Turned from bar stock D. Forged
E. Cold headed    
162.  In a lead cell battery the voltage per cell is
A. 1 volt B. 1.1 volt
C. 1.5 volt D. 2 volts
E. 6 volts    
163.  Starting motor in automobiles is generally
A. Induction motor B. Squirrel cage motor
C. Synchronous motor D. Series motor
E. Shunt motor    
164.  In jet engines the compression ratio
A. Varies with altitude B. Varies with altitude
C. Varies with square of speed D. Remains constant
E. Depends on other factors    
165.  The efficiency of a jet propulsion unit is generally high at altitudes of
A. 1000 metres B. 5000 metres
C. 7500 metres D. 9000 metres
E. More than 10,000 metres    
166.  A gas turbine works on
A. Rankine cycle B. Carnot cycle
C. Otto cycle D. Brayton cycle
E. Dual cycle    
167.  The function of a piston rins in an internal combustion engine is
A. To prevent lubricating oil from entering the combustion space B. To prevent leakage of combustion chamber products
C. To transfer heat from piston to cylinder walls D. All of the above
E. None of the above    
168.  The top ring nearest to the piston crown is known as
A. Oil ring B. Scrapper ring
C. Compression ring D. Groove ring
E. Any of the above    
169.  For diatomic gas flowing through a nozzle the critical pressure ratio is given by
A. 1 B. 0.528
C. 3.546 D. 0.577
E. 0.75    
170.  The Apparatus used for the determination of calorific value of solid fuel is
A. Osrat's apparatus B. Bomb calorimeter
C. Releigh apparatus D. Photo calorimeter
E. Bunsen's apparatus    

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