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Engineering :: Energy Conversion

141.  Which of the following enters the super heater of a boiler?
A. Cold water B. Hot water
C. Wet steam D. Dry steam
E. Superheated steam    
142.  The permissible pH value of water of boilers is
A. 1 B. 5
C. 7 D. Slightly more than 7
E. Less than 14    
143.  Which of the following equipment is installed in power plants to reduce air pollution due to smoke?
A. Desuperheaters B. Electrostaric precipitators
C. Reheaters D. Air filters
E. None of the above    
144.  Which of the following is not a high pressure boiler?
A. Loeffler B. Lancashire coiler
C. Velox boiler D. La Mont boiler
E. None of the above    
145.  Most of the generators in thermal power plants run at
A. 15000 rpm B. 3000 rpm
C. 1500 rpm D. 1000 rpm
E. 750 rpm    
146.  At which of a following speed the generators for 3 phase, 50 Hz supply will not run?
A. 166? rpm B. 250 rpm
C. 1200 rpm D. 500 rpm
E. 750 rpm    
147.  Low grade fuels have
A. Low moisture constant B. Low ash content
C. Low calorific value D. Low sulphur content
E. All of the above    
148.  In a steam turbine cycle the lowest pressure occurs in
A. Turbine inlet B. Boiler
C. Condenser D. Super-heater
E. Super-heater exit    
149.  The chemical composition of coal is given by
A. Proximate analysis B. Ultimate analysis
C. Orsat analysis D. All of the above
E. None of the above    
150.  Which of the following variety of coal will have highest ash content
A. Bituminous coal B. Grade I steam coal
C. Coking coal D. Lignite
E. Bengal coal    

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