MCQs

Mechanical Engineering MCQs with Explanations

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1661Mechanical EngineeringMedium

Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

AS02, NH3, C02, moisture

B02, N2, H2, air

COz, N2, water vapour

D02, N2, steam, C02

Esteam vapours, H2, C02

Correct answer

B. 02, N2, H2, air

Explanation

The correct answer is 02, N2, H2, air.

1662Mechanical EngineeringMedium

The materials having same elastic properties in all directions are called________?

Aisotropic materials

Buniform materials

Celastic materials

Dideal materials

Eparactical materials

Correct answer

A. isotropic materials

Explanation

The correct answer is isotropic materials.

1663Mechanical EngineeringMedium

The energy distribution of an ideal reflector at higher temperatures is largely in the range of ________?

Alonger wavelength

Bwavelength has nothing to do with it

Cshorter wavelength

Dremains same at all wavelengths

Enone of the above

Correct answer

C. shorter wavelength

Explanation

The correct answer is shorter wavelength.

1664Mechanical EngineeringMedium

The ratio of absolute viscosity to mass density is known as________?

Akinematic viscosity

Bspecific viscosity

Cviscosity index

Dcoefficient of compressibility

Ecoefficient of viscosity

Correct answer

A. kinematic viscosity

Explanation

The correct answer is kinematic viscosity.

1665Mechanical EngineeringMedium

For the same compression ratio________?

Acompression ratio has nothing to do with efficiency

Bboth Otto and Diesel cycles are, equally efficient

COtto cycle is more efficient than the Diesel

Dwhich is more efficient would depend on engine capacity

EDiesel cycle is more efficient’than Otto

Correct answer

C. Otto cycle is more efficient than the Diesel

Explanation

The correct answer is Otto cycle is more efficient than the Diesel.

1666Mechanical EngineeringMedium

The critical path of a network represents________?

Anone of the above

Bthe minimum time required for completion of project

Cmaximum cost required for completion of project

Dminimum cost required for completion of project

Ethe maximum time required for completion of project

Correct answer

B. the minimum time required for completion of project

Explanation

The correct answer is the minimum time required for completion of project.

1667Mechanical EngineeringMedium

A foot step bearing and rotor of a vertical turbine form examples of________?

Anone of the above

Bincompletely constrained motion

Ccompletely constrained motion

Dpartially constrained motion

Esuccessfully constrained motion

Correct answer

D. partially constrained motion

Explanation

The correct answer is partially constrained motion.

1668Mechanical EngineeringMedium

In order to permit the thermal expansion/contraction of tubing, it should be________?

Aflared

Bbent

Choned

Dcrimped

Enone of the above

Correct answer

B. bent

Explanation

The correct answer is bent.

1669Mechanical EngineeringMedium

Polar moment of inertia (IP) of ac disc is to ht determined by suspen by a wire and noting the frequei oscillations (f)?

AIp oc j

BIpocf

CIpoc-

Dnone of the above

Correct answer

A. Ip oc j

Explanation

The correct answer is Ip oc j.

1670Mechanical EngineeringMedium

Choose the wrong statement?

AViscosity of a fluid is that property which determines the amount of its resistance to a shearing force

BViscosity is expressed as poise, stoke, or saybolt seconds

CViscosity of liquids is appreciably affected by change in pressure

DViscosity of liquids decreases with in-crease in temperature

EViscosity is due primarily to interaction between fluid molecules

Correct answer

C. Viscosity of liquids is appreciably affected by change in pressure

Explanation

The correct answer is Viscosity of liquids is appreciably affected by change in pressure.

For the same compression ratio________?

Acompression ratio has nothing to do with efficiency

Bboth Otto and Diesel cycles are, equally efficient

COtto cycle is more efficient than the Diesel

Dwhich is more efficient would depend on engine capacity

EDiesel cycle is more efficient’than Otto

Correct answer

C. Otto cycle is more efficient than the Diesel

Explanation

The correct answer is Otto cycle is more efficient than the Diesel.

The critical path of a network represents________?

Anone of the above

Bthe minimum time required for completion of project

Cmaximum cost required for completion of project

Dminimum cost required for completion of project

Ethe maximum time required for completion of project

Correct answer

B. the minimum time required for completion of project

Explanation

The correct answer is the minimum time required for completion of project.

Choose the wrong statement?

AViscosity of a fluid is that property which determines the amount of its resistance to a shearing force

BViscosity is expressed as poise, stoke, or saybolt seconds

CViscosity of liquids is appreciably affected by change in pressure

DViscosity of liquids decreases with in-crease in temperature

EViscosity is due primarily to interaction between fluid molecules

Correct answer

C. Viscosity of liquids is appreciably affected by change in pressure

Explanation

The correct answer is Viscosity of liquids is appreciably affected by change in pressure.