Bihar SBTE Diploma Mechanical 5th SEM Dec 2019 Paper on Power Engineering
| Sr. No. | Questions with options |
| 1 | Compression ratio of petrol engines is in the range of
(a) 2 to 3 (b) 7 to 10 (c) 16 to 20 (d) None of the above |
| 2 | Carburetor is used for
(a) S.I. Engines (b) Gas Engines (c) C.I. Engines (d) None of these |
| 3 | In a 4 cylinder petrol engines the standard firing order I s
(a) 1-2-3-4 (b) 1-4-3-2 (c) 1-3-2-4 (d) 1-3-4-2 |
| 4 | In centrifugal air compressor the pressure developed depends on
(a) Impeller tip velocity (b) Inlet-temperature (c) Compression index (d) All of the above |
| 5 | The efficiency of vane type air compressor as compared to roots air compressor for the same ratio is
(a) More (b) Less (c) Same (d) May be more or less |
| 6 | The clearance ratio in case of reciprocating air compressor is
(a) Total volume of cylinder/ clearance volume (b) Swept volume of cylinder/clearance volume (c) Clearance volume/ swept volume of cylinder (d) Clearance volume/ total volume of cylinder |
| 7 | The knocking tendency in petrol engines will increase when
(a) Speed in decreased (b) Speed n increased (c) Fuel – air ratio is rich (d) Fuel – air ratio is lean |
| 8 | Thermal efficiency of a gas turbine plants as compared to diesel engine plants is
(a) Higher (b) Lower (c) Same (d) May be higher or lower |
| 9 | For a gas turbine the pressure ratio may be in the range
(a) 2 to 3 (b) 2 to 5 (c) 16 to 18 (d) 18 to 22 |
| 10 | Greater the difference between jet velocity and aeroplane velocity
(a) Greater the propulsive efficiency (b) Less the propulsive efficiency (c) Un effected propulsive efficiency (d) None of these |
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| 11 | In a two stage turbine plant reheating after first stage
(a) Decrease thermal efficiency (b) Increase thermal efficiency (c) Does not effect thermal efficiency (d) None of the above |
| 12 | A Bell-coleman cycle is reversed
(a) Brayton cycle (b) Atkinson cycle (c) Ericsion cycle (d) Carnot cycle |
| 13 | In a refrigeration system, expansion valve is incorporated between
(a) Evaporator and compressor (b) Condenser and evaporator (c) Compressor and condenser (d) None of the above |
| 14 | The bank of tubes at the back of a domestic refrigerator of vapor compression type are
(a) Condensor tubes (b) Evaporator tubes (c) Capillary tubes (d) None of the above |
| 15 | The wet bulb depression is zero when relative humidity equals
(a) Zero (b) 0.5 (c) 0.75 (d) 1.0 |
| 16 | Which of the following processes is NOT associated with diesel cycle
(a) Constant volume (b) Constant pressure (c) Isothermal (d) Adiabatic |
| 17 | Calorific value of diesel oil is of the order of
(a) 12000 KJ/Kg. (b) 20930 KJ/kg (c) 31395 KJ/kg (d) 411860 KJ/kg |
| 18 | The specific gravity of petrol oil is
(a) 0.65 (b) 0.75 (c) 0.85 (d) 0.95 |
| 19 | The refrigerant usually used for refrigeration in aeroplane is
(a) Carbon dioxide (b) Ammonia (c) Freon – 12 (d) Air |
| 20 | The specific value of a refrigerant should be
(a) High (b) Low (c) Normal (d) None of the above |
| Data Collected By – Rashmi | |
| Published On – 17th May 2022 | |
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