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Chemical Engineering Basics

Free 767+ Chemical Engineering Basics MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Chemical Engineering Basics

Practice questions

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1.Identify the incorrect statement from the following options:

Injection molding is the preferred method for shaping thermosetting plastics.Compression molding is commonly used for processing thermoplastics.Electrical resistance welding (ERW) is used for mass producing seamless pipes.Stretch forming is classified as a cold drawing technique.

2.Which of the following statements is accurate?

A jet engine can operate in the absence of an atmosphere.Rocket engines fail to function without atmospheric air.Rocket engines contain an oxidizer that supplies the oxygen needed for combustion.Jet engines are equipped with their own oxidizer supply.

3.Identify the incorrect statement from the following:

X-rays cannot be deflected by an electric field, unlike cathode rays.X-ray intensity can be determined by measuring the ionization current caused by ionization.Adjusting the voltage between the anode and cathode changes the quality of X-rays produced.An electron microscope is used to examine the crystal structure of materials.

4.Identify the incorrect statement from the following options:

Geothermal power is considered a renewable energy source.Both nuclear fission and fusion involve the conversion of mass into energy.Breathing in mercury vapor poses no health risks to humans.Exposure to arsenic through inhalation can lead to cancer.

5.Identify the incorrect statement from the following options:

Ductile fracture in a stressed material is characterized by significant plastic deformation before failure.Brittle fracture occurs due to the growth of existing cracks in the material and involves very little plastic deformation.Fatigue fracture is always brittle and happens because of imperfections along specific lines within the material.Materials that are brittle are typically subjected to tensile testing.

6.Identify the incorrect statement from the following:

The combined stiffness of two identical springs (stiffness ‘S’) connected in series is S/2, whereas in parallel it is 2S.In a helical spring, the deflection varies directly with the cube of the mean coil diameter (D³) and the fourth power of the wire diameter (d⁴).The crushing load of columns is greater than the buckling load.The modulus of resilience is proportional to the square of the elastic limit stress.

7.What is the characteristic nature of steel made from phosphatic iron?

Capable of being shaped by hammeringAble to be stretched without breakingProne to breaking easilyResistant to impact and stress

8.Although tin ranks below iron in the electrochemical series, why is it still used to coat steel for corrosion resistance?

It is more economicalIt is widely availableIt withstands vegetable acids, making tin plates ideal for the canning industryNone of the above

9.In which type of heat exchanger does the temperature distribution of both hot and cold fluids form parallel straight lines?

Parallel flow arrangement with matching heat capacity ratesCounterflow configuration with identical heat capacity ratesCounterflow setup with differing heat capacity ratesParallel flow design with varying heat capacity rates

10.For a steel wire with a thermal conductivity of 0.5 W/m·K and a diameter of 15 mm, exposed to air with a convective heat transfer coefficient of 20 W/m²·K, what insulation thickness (in mm) will maximize heat dissipation?

15 mm25 mm10 mm30 mm20 mm

11.Which of the following materials can store the greatest amount of heat energy when one ton is heated by 30°C?

IronBrown coalH2OCalcium carbonate

12.Which property is most prone to decline when the grain size of a polycrystalline material is reduced?

Resistance to creep deformationMaterial toughnessUltimate tensile strengthFatigue resistanceDuctility

13.What is the required volume of a dike, which is a low wall constructed around storage tanks holding hazardous or flammable substances (such as petroleum products), in relation to the volume (V) of the storage tank?

Equal to VHalf of VTwice VThree times VNone of the above

19.The melting and boiling points of liquid oxygen are –218.8°C and –183°C, respectively, whereas for liquid nitrogen they are –210°C and –195.8°C, respectively. In which temperature scale is the difference in melting points between liquid oxygen and liquid nitrogen not equal to 8.8?

Celsius (°C)Fahrenheit (°F)Kelvin (K)Rankine (°R)None of the above

20.Which type of metal is commonly utilized for bearing liner applications?

Pewter alloyWhite metalBabbitt metalGun metal

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Pair subject practice with past papers to see how Chemical Engineering Basics appears in real exam conditions.

Chemical Engineering Basics

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Practice questions

1.Identify the incorrect statement from the following options:

2.Which of the following statements is accurate?

3.Identify the incorrect statement from the following:

4.Identify the incorrect statement from the following options:

5.Identify the incorrect statement from the following options:

6.Identify the incorrect statement from the following:

7.What is the characteristic nature of steel made from phosphatic iron?

8.Although tin ranks below iron in the electrochemical series, why is it still used to coat steel for corrosion resistance?

9.In which type of heat exchanger does the temperature distribution of both hot and cold fluids form parallel straight lines?

10.For a steel wire with a thermal conductivity of 0.5 W/m·K and a diameter of 15 mm, exposed to air with a convective heat transfer coefficient of 20 W/m²·K, what insulation thickness (in mm) will maximize heat dissipation?

11.Which of the following materials can store the greatest amount of heat energy when one ton is heated by 30°C?

12.Which property is most prone to decline when the grain size of a polycrystalline material is reduced?

13.What is the required volume of a dike, which is a low wall constructed around storage tanks holding hazardous or flammable substances (such as petroleum products), in relation to the volume (V) of the storage tank?

14.Which substance is suitable for drying ammonia gas effectively?

15.What is the lowest temperature that water can be cooled to in a cooling tower relative to the air temperature?

16.When the head of a centrifugal pump is doubled, by what factor does the power requirement increase?

17.What characteristic does a brazing filler metal have when used to join steel plates?

18.At 1000°C and a pressure of 5 atm, the activity of pure hydrogen gas is determined by which factor?

19.The melting and boiling points of liquid oxygen are –218.8°C and –183°C, respectively, whereas for liquid nitrogen they are –210°C and –195.8°C, respectively. In which temperature scale is the difference in melting points between liquid oxygen and liquid nitrogen not equal to 8.8?

20.Which type of metal is commonly utilized for bearing liner applications?

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