West Bengal Polytechnic Model Paper on Heat Power Engineering II
| Sr. No. | Questions with options |
| 1 | The operation of forcing additional air under pressure in the engine cylinder is known as
(a) Scavenging (b) Turbulence (c) Supercharging (d) Pre-ignition |
| 2 | An engine indicator is used to determine the following
(a) Speed (b) Temperature (c) Volume of cylinder (d) m.e.p and I.H.P |
| 3 | Compression ratio of I.C engines is
(a) the ratio of volumes of air in cylinder before compression stroke and after compression stroke (b) volume displaced by piston per stroke and clearance volume in cylinder (c) ratio of pressure after compression and before compression (d) swept volume/ cylinder volume |
| 4 | Number of working strokes per min. for a four stroke cycle engine are _____the speed of the engine in r.p.m
(a) equal to (b) one-half (c) twice (d) four-times |
| 5 | The theoretically correct air fuel ratio for petrol engine is in the order of
(a) 6 : 1 (b) 9 : 1 (c) 12 : 1 (d) 15 : 1 |
| 6 | In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
(a) Scavenging (b) Detonation (c) Supercharging (d) Polymerization |
| 7 | The ignition of the charge by some hot surface within the engine before the passage of spark is called
(a) Pre-ignition (b) Detonation (c) Ignition delay (d) Auto ignition |
| 8 | Which of the following medium is compressed in a diesel engine cylinder?
(a) Air alone (b) Air and fuel (c) Air and lubricating oil (d) Fuel alone |
| 9 | The inlet valve of a four stroke cycle internal combustion engine remains open for
(a) 130 degree (b) 180 degree (c) 230 degree (d) 270 degree |
| 10 | Flash point of a fuel is
(a) Minimum temperature to which oil is heated in order to give off inflammable vapors in sufficient quantity to ignite momentarily when brought in contact with a flame (b) Temperature at which it solidifies or congeals (c) Temperature at which it catches fire without external aid (d) Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off |
| 11 | The process of breaking up or a liquid into fine droplets by spraying is called
(a) Vaporization (b) Carburetion (c) Ionization (d) Atomization |
| 12 | 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 |
| 13 | In gas turbine, the function of Re-heater is to
(a) Heat inlet air (b) Heat exhaust gases (c) Heat air coming out of compressor (d) Heat gases coming out of high pressure turbine |
| 14 | Which of the following is NOT used in four stroke cycle compression ignition (CI) engines?
(a) Fuel pump (b) Spark plug (c) Fuel injector (d) Inlet and outlet valves |
| 15 | During which component of vapor compression refrigeration system, the enthalpy remains constant?
(a) Evaporator (b) Compressor (c) Throttle valve (d) None of these |
| 16 | Select the wrong characteristics of refrigerant
(a) Low latent heat (b) Low boiling point (c) High thermal conductivity (d) None of the above |
| 17 | COP of a reversed Carnot cycle refrigerator working between higher temperature T2 and lower temperature T1
(a) Will increase with increase in T1 keeping T2 fixed (b) Will decrease with increase in T1 keeping T2 fixed (c) Will first increase with increase in T1 and then decrease with increase in T1 keeping T2 fixed (d) None of the above |
| 18 | A refrigerating machine working on reversed carnot cycle takes out 2kW of heat from the cold body while working between the temperature limits of 300 K and 200 K. The COP and power consumed by the cycle will be respectively
(a) 1 and 1 k W (b) 1 and 2 kW (c) 2 and 1kW (d) 2 and 2kW |
| 19 | An Electrolux refrigerator uses
(a) One pump (b) Two pump (c) No pump (d) Three pump |
| 20 | The major fields(s) of application of gas turbine is (are)
(a) Aviation (b) Oil and gas industry (c) Marine propulsion (d) All of the above |
| 21 | The ratio of heat actually released by 1kg of fuel to heat that would be released by complete perfect combustion, is called
(a) Thermal efficiency (b) Combustion efficiency (c) Engine efficiency (d) Compression efficiency |
| 22 | In a gas turbine, intercooler is placed
(a) Before low pressure compressor (b) In between low pressure compressor and high pressure compressor (c) In between high pressure compressor and turbine (d) None of the above |
| Published On – 30th May 2022 | |
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