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( 1 ) For the same compression ratio, the efficiency of dual combustion cycle is
- 1) greater than otto cycle
- 2) less than diesel cycle
- 3) less than otto cycle and greater than diesel cycle
- 4) greater than both otto and diesel cycle
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Show Answer Report Discussion in forumAnswer : 3) less than otto cycle and greater than diesel cycle
Solution :
discussion
Answer : 3) less than otto cycle and greater than diesel cycle
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( 2 ) The frictional power (F.P) is given by
- 1) F.P. = B.P.-I.P.
- 2) F.P. = I.P.-B.P.
- 3) F.P. = B.P./I.P.
- 4) F.P. = I.P./B.P.
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Show Answer Report Discussion in forumAnswer : 2) F.P. = I.P.-B.P.
Solution : he frictional power is the difference between indicated power and brake power. So Mathematically,F.P = I.P.-B.P
discussion
Answer : 2) F.P. = I.P.-B.P.
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( 3 ) Types of absorption dynamo meters are
- 1) prony brake
- 2) rope brake
- 3) hydraulic brake
- 4) all of the mentioned
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Show Answer Report Discussion in forumAnswer : 4) all of the mentioned
Solution :
discussion
Answer : 4) all of the mentioned
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( 4 ) As compared to air standard cycle, in actual working, the effect of variation in specific heats is to
- 1) increase maximum pressure and maximum temperature
- 2) decrease maximum pressure and maximum temperature
- 3) increase maximum pressure and decrease maximum temperature
- 4) decrease maximum pressure and increase maximum temperature
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Show Answer Report Discussion in forumAnswer : 2) decrease maximum pressure and maximum temperature
Solution : In actual working, as compared to air standard cycle, the effect of variation in specific heats is to decrease maximum pressure and maximum temperature.
discussion
Answer : 2) decrease maximum pressure and maximum temperature
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( 5 ) The most accurate gasoline injection system is
- 1) direct injection
- 2) port injection
- 3) throttle body injection
- 4) manifold injection
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Show Answer Report Discussion in forumAnswer : 2) port injection
Solution : Of all the gasoline injection system, the most accurate gasoline injection system is port injection.
discussion
Answer : 2) port injection
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( 6 ) The maximum efficiency of Rankine cycle (ηRankine) is the function of
- 1) the mean temperature of heat addition (Tm) only
- 2) the mean temperature of heat addition (Tm) and temperature of steam at the exit of the turbine
- 3) the mean temperature of heat addition (Tm) and temperature of steam at the entry of the turbine
- 4) the mean temperature of heat addition (Tm) and temperature of steam at exit of the condenser
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Show Answer Report Discussion in forumAnswer : 1) the mean temperature of heat addition (Tm) only
Solution :
discussion
Answer : 1) the mean temperature of heat addition (Tm) only
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( 7 ) Time loss factor in Actual Cycle is due to
- 1) progressive combustion
- 2) heat loss through cylinder walls
- 3) gas leakage
- 4) friction
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Show Answer Report Discussion in forumAnswer : 1) progressive combustion
Solution :
discussion
Answer : 1) progressive combustion
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( 8 ) Optimum spark timing gives
- 1) higher mean effective pressure
- 2) higher efficiency
- 3) higher mean effective pressure and higher efficiency
- 4) none of these
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Show Answer Report Discussion in forumAnswer : 3) higher mean effective pressure and higher efficiency
Solution :
discussion
Answer : 3) higher mean effective pressure and higher efficiency
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( 9 ) The ratio of the actual efficiency and the and the fuel air cycle efficiency for C.I. engines is about
- 1) 0.2-0.3
- 2) 0.5-0.6
- 3) 1
- 4) 0.6-0.8
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Show Answer Report Discussion in forumAnswer : 4) 0.6-0.8
Solution :
discussion
Answer : 4) 0.6-0.8
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( 10 ) A gas turbine works on?
- 1) Carnot cycle
- 2) Brayton cycle
- 3) Dual cycle
- 4) Rankine cycle
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Show Answer Report Discussion in forumAnswer : 2) Brayton cycle
Solution : A gas turbine works on 2 isentropic and 2 isobaric processes which is nothing else but Brayton cycle
discussion
Answer : 2) Brayton cycle
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