A. the friction is high
B. the friction is unpredictable
C. the small difference in cooling water temperature or in internal friction has a disproportionate effect
D. the engine is rarely operated
E. none of the above
Related Mcqs:
- Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?
A. not true
B. true at full load
C. true at part load
D. true at both part and full load
E. there could not be any such criterion - The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?
A. lean mixture
B. chemically correct mixture
C. rich mixture
D. unpredictable
E. none of the above - Diesel engines as compared to petrol engines require ______________________?
A. bigger flywheel
B. smaller flywheel
C. same size flywheel
D. no flywheel
E. flywheel whose size may be less or more depending on several other fac-tors - The air-fuel ratio in petrol engines-is controlled by__________________?
A. controlling valve opening/closing
B. governing
C. injection
D. carburettion
E. scavenging and supercharging - To reduce the possibility of knock in the C.I. engines, the first elements of fuel and air should have_______________?
A. high temperature
B. high density
C. short delay
D. reactive mixture
E. all of the above - The knocking in diesel engines for given fuel, will be__________________?
A. enhanced by increasing compression ratio
B. enhanced by decreasing compression ratio
C. unaflected by compression ratio
D. first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed
E. dependent on other factors - In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?
A. 0.85
B. 1
C. 1.1 to 1.3
D. 1.2 to 1.5 - For low speed operation or for idling in petrol engines, the engine requirements are for_______________?
A. lean mixture
B. theoretically correct mixture
C. rich mixture
D. any type of mixture
E. lean/rich mixture depending upon capacity of engine - In case of gas turbines, the gaseous fuel consumption guarantees are based on________________?
A. high heat value
B. low heat value
C. net calorific value
D. middle heat value
E. calorific value - Fuel consumption with increase in back pressure will________________?
A. increase
B. decrease
C. remain unaffected
D. depend on other factors
E. none of the above
