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Compressors, Gas Turbines and Jet Engines MCQs

Free 163+ Compressors, Gas Turbines and Jet Engines MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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163 questions in this list. Select an option to practice, or open a question for the full page with explanation.

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Compressors, Gas Turbines and Jet Engines

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Correct options are highlighted when revealed.

1.Identify the incorrect statement from the following options:

Centrifugal compressors maintain nearly constant pressure across a wide range of flow rates.Axial flow compressors provide almost steady output at varying pressure levels.Centrifugal compressors operate stably over a broader range compared to axial compressors.Axial flow compressors have a larger diameter than centrifugal compressors.Axial flow compressors tend to be longer in length than centrifugal compressors.

2.Which of the following statements about gas turbines is accurate?

Gas turbines operate with a low air-to-fuel ratio to save fuel.Gas turbines utilize a high air-to-fuel ratio to lower the exhaust temperature.Gas turbines rely on a low air-to-fuel ratio to generate the necessary high thrust.All of the above statements are correct.None of the above statements are true.

3.Identify the incorrect statement from the following:

Axial flow compressors are utilized in large gas turbines.Axial flow compressors are less stable than centrifugal compressors but offer higher efficiency.Axial flow compressors provide both high capacity and efficiency.Axial flow compressors exhibit operational instability regions.Centrifugal compressors are primarily applied in gas turbines with low flow and pressure ratios.

4.Which of the following statements about gas turbines is accurate?

Gas turbines demand a significant amount of cooling water.Gas turbines can start quickly and adjust their load rapidly.Gas turbines maintain consistent efficiency even at partial loads.Gas turbines experience high standby losses and need frequent maintenance.Gas turbines are exclusively used for power generation.

5.Which of the following statements about gas turbines is accurate?

Large gas turbines employ radial inflow turbine designs.The blades of gas turbines resemble those used in steam turbines.Gas turbine blades function as impulse sections near the hub and as reaction sections toward the tip.Gas turbines utilize both air and liquid cooling methods.All the above statements are true.

6.Identify the incorrect statement from the following options:

A pulsojet engine does not need surrounding air to operate.A ramjet engine operates without a turbine.In a turbojet, the turbine powers the compressor.A bypass turbojet engine boosts thrust while maintaining propulsive efficiency and fuel economy.A propeller functions as an indirect reaction device.

7.Which of the following statements is accurate?

A closed cycle gas turbine operates as an internal combustion engine.Gas turbines repeatedly utilize the same working fluid without replacement.The air-to-fuel ratio in a gas turbine is typically 100 to 1.The theoretical efficiency of a closed cycle gas turbine exceeds that of a Carnot cycle.The nozzle exit gases generate the thrust in a turbojet engine.

8.Identify the incorrect statement regarding gas turbines:

A gas turbine is capable of starting on its own without external assistance.Gas turbines do not need large amounts of water as steam power plants do.Gas turbines experience significant exhaust energy losses because of the high volume of airflow.The total efficiency of a gas turbine system is less than that of a reciprocating engine.Gas turbines can be quickly started and stopped, making them ideal for meeting peak power demands.

9.After combustion gases pass through the turbine in a jet engine, where are they expelled?

Into the surrounding airRecirculated to the compressorThrough the exhaust nozzleInto a vacuum chamberNone of these

10.Given that V, U, and Vr denote the absolute fluid velocity, blade velocity, and relative fluid velocity respectively, with subscripts i and o indicating inlet and outlet states, what is true for a rotary machine with a degree of reaction equal to one?

Vi equals V0BThe tangential velocity exceeds V0U is less than V0Vi equals U0The relative inlet velocity Vr equals Vm

11.What is the phase state of the working fluid inside an air turbine?

Exists in two different phasesComprises three distinct phasesRemains in a single phaseConsists of a mixture of air and waterContains gas without any air

12.What is the typical compression ratio found in a gas turbine?

3.5 to 15 to 18 to 112 to 120 to 1

13.Which statement accurately describes the operational characteristics of a ramjet engine?

It can start functioning without any forward motion.It cannot operate when the vehicle is stationary.Its operation does not depend on the presence of air.It generates a jet stream made up of plasma.None of the statements above are correct.

14.What is a simple turbojet engine fundamentally classified as?

a system powered by a propellera gas turbine engine fitted with a thrust nozzle and diffusera chemical rocket propulsion systema ramjet type enginenone of these options

15.How does the jet velocity of a turbofan engine compare to that of a turbojet engine?

LowerHigherEqualIt varies depending on the speedNone of the above

16.In gas turbines, what does the pressure ratio represent?

The ratio of compressor outlet pressure to inlet pressureThe ratio of the maximum pressure achieved to the exhaust pressureThe ratio of inlet pressure to the pressure at the exhaustThe ratio of pressures before and after the turbine sectionNone of the options listed

17.Among the following, which type of power plant is the most compact and lightweight when producing the same power output?

Steam power stationGasoline engineDiesel engineSolar power systemGas turbine power plant

18.What type of airflow does a turbofan engine utilize?

A single airflow pathMultiple airflow streamsAbsence of airflowCombustion of solid propellantOperation based on rocket propulsion

19.Which of the following methods can enhance the efficiency and work output ratio of a gas turbine system?

Employing a multi-stage compressor equipped with an intercoolerIncorporating a heat exchanger into the systemIntroducing water injection in or near the combustion chamberReheating the air following partial expansion within the turbineAll of the above methods

20.In a jet engine, the compression ratio changes in direct proportion to which factor?

velocityspeedflight altitudevertical speedremains constant

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