#### Electrical engineering

• ( 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
• Discussion in forum
Answer : 3) less than otto cycle and greater than diesel cycle
Solution :

discussion

Answer : 3) less than otto cycle and greater than diesel cycle

• ( 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.
• Discussion in forum
Answer : 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.

• ( 3 ) Types of absorption dynamo meters are

• 1) prony brake
• 2) rope brake
• 3) hydraulic brake
• 4) all of the mentioned
• Discussion in forum
Answer : 4) all of the mentioned
Solution :

discussion

Answer : 4) all of the mentioned

• ( 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
• Discussion in forum
Answer : 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

• ( 5 ) The most accurate gasoline injection system is

• 1) direct injection
• 2) port injection
• 3) throttle body injection
• 4) manifold injection
• Discussion in forum
Solution : Of all the gasoline injection system, the most accurate gasoline injection system is port injection.

discussion

• ( 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
• Discussion in forum
Solution :

discussion

• ( 7 ) Time loss factor in Actual Cycle is due to

• 1) progressive combustion
• 2) heat loss through cylinder walls
• 3) gas leakage
• 4) friction
• Discussion in forum
Solution :

discussion

• ( 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
• Discussion in forum
Answer : 3) higher mean effective pressure and higher efficiency
Solution :

discussion

Answer : 3) higher mean effective pressure and higher efficiency

• ( 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
• Discussion in forum
Solution :

discussion

• ( 10 ) A gas turbine works on?

• 1) Carnot cycle
• 2) Brayton cycle
• 3) Dual cycle
• 4) Rankine cycle
• Discussion in forum