PrepBharat

1. In Dual cycle, heat addition takes place ____________
a) at Constant volume
b) first at constant volume then at constant pressure
c) constant pressure
d) none of the mentioned

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2. In Dual cycle, heat rejection takes place ___________
a) at constant volume
b) first at constant volume then at constant pressure
c) constant pressure
d) none of the mentioned

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3. Most high speed compression engines operate on __________
a) Otto cycle
b) Diesel Cycle
c) Dual cycle
d) Carnot cycle

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4. In a standard dual air cycle, for a fixed amount of heat supplied and a fixed value of compression ratio, the mean effective pressure ____________
a) shall increase with increase in r_p and decreases in r_c
b) shall increase with decrease in r_p and increases in r_c
c) shall remain independent of r_p
d) shall remain independent of r_c

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5. The volumetric efficiency of a well designed engine may be _____________
a) 30 to 40%
b) 40 to 60%
c) 60 to 70%
d) 75 to 90%

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6. The air fuel ratio of the petrol engine is controlled by _________
a) fuel pump
b) governor
c) injector
d) carburettor

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7. Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads ___________
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

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8. The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be ____________
a) higher
b) lower
c) remain unaffected
d) none of the mentioned

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9. The theoretically correct air fuel ratio for petrol engine is of the order of ____________
a) 6:1
b) 9:1
c) 12:1
d) 15:1

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10. Air fuel ratio for idling speed of a petrol engine is approximately ____________
a) 1:1
b) 5:1
c) 10:1
d) 15:1

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