Question 61 : Besides mean effective pressure, the data required to determine the indicated power of an engine include
1. piston diameter, length of stroke and speed of rotation
2. piston diameter, length of stroke and calorific value of fuel
3. specific fuel consumption, speed of rotation and torque
4. piston diameter, specific fuel consumption and Calorific value of fuel
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Question 62 : A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called
1. none of these
2. receiver type compound engine
3. Tandem type compound engine
4. Woolf type compound engine
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Question 63 : A safety valve mainly used with locomotive and marine boilers is
1. dead weight safety valve
2. high steam and low water safety valve
3. lever safety valve
4. spring loaded safety valve
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Question 64 : Which of the following boiler is best suited to meet the fluctuating demand of steam ?
1. Locomotive boiler
2. Babcock and Wilcox boiler
3. Lancashire boiler
4. Cornish boiler
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Question 65 : Cut-off governing of steam engines is a method of controlling the engine output by varying
1. pressure of intake steam
2. temperature of intake steam
3. all of these
4. volume of intake steam
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Question 66 : In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
1. 56%
2. 63%
3. 74%
4. 78%
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Question 67 : The rate of steam produced in Benson boiler is
1. 135 tonnes/h
2. 175 tonnes/h
3. 250 tonnes/h
4. 100 tonnes/h
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Question 68 : The function of a flywheel is
1. to keep the engine speed uniform at all load conditions
2. to prevent fluctuation of speed
3. to convert reciprocating motion of the piston into rotary motion.
4. to convert rotary motion of the crankshaft into to and fro motion of the valve rod
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Question 69 : The average operating pressure of Benson boiler is
1. 250 bar
2. 150 bar
3. 100 bar
4. 200 bar
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Question 70 : A single acting steam engine produces __________ power than that of double acting steam engine.
1. four times
2. half
3. equal
4. double
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