Question 41 : The average operating pressure of Benson boiler is
1. 200 bar
2. 150 bar
3. 250 bar
4. 100 bar
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Question 42 : The function of a piston rod is
1. to transfer motion from the piston to the cross head
2. to convert heat energy of the steam into mechanical work
3. to guide motion of the piston rod and to prevent it from bending
4. to exhaust steam from the cylinder at proper moment
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Question 43 : Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec.
1. 500
2. 0.5
3. 10
4. 50
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Question 44 : What is the pH value of water permissible for boiler?
1. 0
2. 7
3. slightly less than 7
4. slightly more than 7
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Question 45 : The cylinder condensation or missing quantity may be reduced by
1. keeping the expansion ratio small in each cylinder
2. superheating the steam supplied to the engine cylinder
3. the efficient steam jacketing of the cylinder walls
4. all of the mentioned
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Question 46 : Benson boiler requires
1. 2 drums
2. 3 drums
3. 0 drums
4. 1 drum
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Question 47 : The missing quantity per stroke is equal to?
1. cylinder feed + indicated mass of steam
2. cylinder feed + indicated mass of steam
3. mass of cushion steam + indicated mass of steam
4. mass of cushion steam + cylinder feed
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Question 48 : How is the natural draught produced for exhaust gases?
1. by using fan
2. by using chimney
3. by using gravity
4. none of the mentioned
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Question 49 : A single acting steam engine produces __________ power than that of double acting steam engine
1. equal
2. double
3. half
4. 4 times
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Question 50 : The aim of a compound steam engine is
1. to reduce the ratio of expansion in each cylinder
2. to reduce the temperature range in each cylinder
3. to reduce the length of stroke
4. all of the mentioned
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