OBJECTIVE QUESTION. • • • • • • • • • • • • • • • • • • • • 1. The purpose of testing an internal combustion engines is. A. To determine the information which can not be obtained by calculations. B. To conform the data used in design the validity of which may be doubtful. C. To satisfy the customer regarding the performance of the engine. D. All of the above. 2. The indicated mean effective pressure of an engine is obtained from the indicator diagram drawn with the help of an engine indicator. A. True. B. False. 3. The indicated mean effective pressure of a diesel engine having fixed compressor ratio will.......If cut off ratio decreases. A. Increase B. Decreases. 4. The power actually developed by the engine cylinder of an I.C. engine is known as. A. Theoretical power. B. Actual power. C. Indicated power. D. None of these. 5. Number of working strokes per minute for a two stroke cycle engine are. ........ the speed of the engine in r.p.m A. Equal to. B. One-half. C. Twice. D. Four times. 6. If the speed of the engine is increased the intended power will. A. Increase. B. Decreases. C. Remain same. 7. The indicated power for multi - cylinder engine will be same as that of a single cylinder engine. A. True. B. False. 8. The brake power is the power available. A. In the engine cylinder. B. At the crankshaft. C. At the crank pin. D. None of these. 9. The brake power ( B.P ) of the engine is given by. A. B.P.=WI×2^N/60 watts. B. B.P.=(W-S)^DN/60 watts. C. B.P.=(W-S)^(D+d) N/60 watts. D. All of these. 10. The machine efficiency (Nm) of the engine is given by. A. Nm=B.P./I.P. B. Nm=I.P/B.P. C. Nm= B.P×I.P./100. D. None of these. 11. The brake power is always greater than indicator power. A. Agree. B. Disagree. 12. The friction power (F.P) is given by. A. F.P. = B.P.-I.P. B. F.P. = I.P.-B.P. C. F.P. = B.P/I.P. D. F.P. = I.P./B.P. 13. The ratio of the heat equivalent to one kW hour to the heat in fuel per B.P. hour is termed as brake thermal efficiency. A. Yes. B. No. 14. The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called. A. Mechanical efficiency. B. Overall Efficiency. C. Indicated thermal efficiency. D. Volumetric Efficiency. 15. The ratio of the brake power to the indicated power is called. A. Mechanical efficiency. B. Overall Efficiency. C. Indicated thermal efficiency. D. Volumetric Efficency. 16. The ratio of the indicated thermal efficiency to the air standard efficiency is known as. A. Mechanical efficiency. B. Overall Efficiency. C. Volumetric Efficency. D. Relative efficiency. 17. The correct sequence of the decrease order of brake thermal efficiency of the three given basic type of engine is. A. Four stroke C.I. engine, Four stroke S.I. engine, two stroke S.I. engine. B. Four stroke S.I. engine, Four stroke C.I. engine, Two stroke S.I. engine. C. Four stroke C.I engine, Two stroke S.I. engine, Four stroke S.I. engine. D. Two stroke S.I. engine, Four stroke S.I. engine, Four stroke C.I. engine. 18. The brake power of a diesel engine, keeping other parameters constant can be increased by. A. Decreasing the density of intake air. B. Increasing the temperature of intake air. C. Increasing the pressure of intake air. D. Decreasing the pressure of intake air. 19. Which one of the following events would reduce Volumetric efficient of a vertical compression engine. A. Inlet value closing after bottom dead centre. B. Inlet value closing before bottom dead centre. C. Inlet value opening before top dead centre. D. Exhaust valve closing after top dead centre. 20. As compared to air standard cycle in actual working the effect of variation in specific heats is to. A. Increases maximum pressure and maximum temperature. B. Reduce maximum pressure and maximum temperature. C. Increase maximum pressure and decrease maximum temperature. D. Decreases maximum pressure and Increase maximum temperature.
Posted on: Wed, 22 Oct 2014 18:52:12 +0000
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