Bihar SBTE Diploma Mechanical 4th SEM May 2019 Paper on Auto Engines
| Sr. No. | Questions with options |
| 1 | The materials used for cylinder block are
(a) Cost iron and steel (b) Cast iron and aluminium alloy (c) Steel and aluminium alloy (d) Brass and steel |
| 2 | Most difficult gasket sealing problem occurs at the
(a) Head (b) Oil pan (c) Timing cover (d) Intake manifold |
| 3 | The most important characteristic of a lubricating oil is its
(a) Viscosity (b) Physical stability (c) Chemical stability (d) Resistance against corrosion |
| 4 | Radiator core is made of
(a) Brass (b) Steel (c) Cast iron (d) Plastic |
| 5 | The carburetter provides the rich quantity of air fuel mixture during
(a) Starting (b) Idling (c) Acceleration (d) All of the above |
| 6 | When the choke is applied, the fuel comes out form the ______
(a) Main jet (b) Idle port (c) Transfer port (d) Progression hole |
| 7 | The fuel injection timing in a distributor type pump is controlled by
(a) Changing plunger stroke (b) Changing speed of rotor (c) Rotating the cam ring (d) Changing the number of cam on the ring |
| 8 | Secondary fitter in a diesel engine is
(a) A must (b) Installed between the fuel tank and feel pump (c) Not capable of removing water from the fuel (d) None of the above |
| 9 | From the engine indicator diagram. We obtain
(a) IMEP (Indicated Mean Effective Pressure) (b) BMEP (Brake Mean Effective Pressure) (c) Mechanical efficiency (d) Relative efficiency |
| 10 | Mechanical efficiency of automobile engine usually varies in a range
(a) 50 – 60% (b) 60 – 70% (c) 70 – 90% (d) None of the above |
| 11 | The most commonly used valve in an automobile engine is
(a) Poppet value (b) Sleeve value (c) Rotary value (d) None of these |
| 12 | Exhaust valve face angle is generally –
(a) 30 degree (b) 45 degree (c) 60 degree (d) 75 degree |
| 13 | The material used for inlet value is usually
(a) Silicon – chrome steel (b) Austenitic steel (c) Precipitation – Hardening steel (d) Nimonic alloy |
| 14 | At the first sight a petrol engine is identified by
(a) Cylinder size (b) Power output (c) Operating speed (d) Spark plug |
| 15 | In S.I engine, the inlet valve closes –
(a) At bottom dead center (b) At top dead center (c) 25-35 degree after bottom dead center (d) 25 – 35 degree before top dead center |
| 16 | In a diesel engine, the function of a fuel injector is
(a) To mix fuel and air (b) To ignite air-fuel mixture (c) To spray atomized fuel in the cylinder (d) None of the above |
| 17 | The function of oil scraper rings is to
(a) Retain compression (b) Lubricate cylinder walls (c) Reduce piston wear (d) None of the above |
| 18 | Excess lub oil consumption in a engine may be due to
(a) Leakage of oil through oil pan gasket (b) Poor quality of engine oil (c) Badly worn piston rings (d) All of above |
| 19 | The quantity of air petrol mixture that enters the engine cylinder is regulated by
(a) Throttle (b) Float (c) Needle valve (d) None of the above |
| 20 | The piston pin is also known as
(a) Crank pin (b) Gudgen pin (c) Split pin (d) None of the above |
| Data Collected By – Rashmi | |
| Published On – 19th May 2022 | |
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