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You Are On Multi Choice Question Bank SET 1450

72501. Diesel as compared to petrol is

72502. The first nuclear power plant in India was located at

72503. The probability of knocking in diesel engines is increased by

72504. A diesel engine, during suction stroke, draws

72505. Anti-knock for compression ignition engines is

72506. In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as

72507. In petrol engines, using a fixed octane rating fuel, the increase in compression ratio will not effect the knocking tendency.

72508. Supercharging is the process of supplying the intake air to the engine cylinder at a density __________ the density of the surrounding atmosphere.

72509. The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of

72510. In a four stroke cycle petrol engine, , the compression

72511. Reflector in nuclear power plants is used to reflect neutrons back into the active core.

72512. During idling, a petrol engine requires __________ mixture.

72513. In natural uranium, the constituents of three naturally occuring isotopes are

72514. Stoichiometric ratio is

72515. Which of the following fuel has little tendency towards detonation ?

72516. In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a

72517. A nuclear power plant differs from a conventional steam power station only in the steam generating part.

72518. Enriched uranium may contain fissionable contents from

72519. In a four stroke engine, the working cycle is completed in

72520. If the fuel is rich in fissionable material, the reactor can be made more compact than if the percentage of fissionable atoms is small.

72521. The overall efficiency is defined as the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time.

72522. The cetane number of diesel oil, generally available, is

72523. The object of providing masked inlet valve in the air passage of compression ignition engines is to

72524. During suction stroke of a four stroke petrol engine, the inlet valve opens and the charge is sucked into the cylinder as the piston moves upwards from the bottom dead centre.

72525. The power actually developed by the engine cylinder of an I.C. engine is known as

72526. A nuclear reactor is said to be critical when the neutron population in the reactor core is

72527. In diesel engines, the ignition takes place due to the heat produced in the engine cylinder at the end of compression.

72528. The fuels in order of decreasing knock tendency for spark ignition engines are

72529. The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called

72530. Plutonium (Pu239) is produced

72531. A petrol engine has compression ratio from

72532. In petrol engines, using a fixed octane rating fuel, the increase in engine speed will decrease the knocking tendency.

72533. Materials which make good moderators do not make good reflectors.

72534. The ignition of the charge by some hot surface within the engine before the passage of spark is called

72535. Special reactors, called breeder reactors, supply a net gain of fissionable material.

72536. The ratio of the indicated thermal efficiency to the air standard efficiency is known as

72537. The octane number of petrol, generally available, is

72538. The brake power is the power available

72539. The slowing down of fast neutrons is desirable because slow moving neutrons are more effective than fast neutrons in triggering fission.

72540. The normal heptane (C7H16) is given a rating of __________ octane number.

72541. The air standard efficiency ofan I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

72542. A diesel engine has inlet valve, fuel injection valve and exhaust valve.

72543. In a four stroke cycle diesel engine, the compression

72544. In a four stroke cycle diesel engine, the inlet valve

72545. The knocking in diesel engines may be prevented by

72546. The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

72547. The air-fuel ratio of the petrol engine is controlled by

72548. If the compression ratio in I.C. engine increases, then its thermal efficiency will

72549. The relative efficiency of an I.C. engine is the ratio of the indicated thermal efficiency to the air standard efficiency.

72550. The volumetric efficiency ofa well designed engine may be

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