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4

The increase in entropy of a system represents

A. Increase in availability of energy

B. Increase in temperature

C. Decrease in pressure

D. Degradation of energy

Correct Answer :

D. Degradation of energy


Related Questions

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4

The value of gas constant (R) in S. I. units is

A. 0.287 J/kgK

B. 2.87 J/kgK

C. 28.7 J/kgK

D. 287 J/kgK

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4

The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)

A. (T1/T2) - 1

B. 1 - (T1/T2)

C. 1 - (T2/T1)

D. 1 + (T2/T1)

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4

In an irreversible process, there is a

A. Loss of heat

B. No loss of heat

C. Gain of heat

D. No gain of heat

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4

When a bar is cooled to - 5°C, it will develop

A. No stress

B. Shear stress

C. Tensile stress

D. Compressive stress

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4

Shear modulus is the ratio of

A. Linear stress to linear strain

B. Linear stress to lateral strain

C. Volumetric strain to linear strain

D. Shear stress to shear strain

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4

Reversed joule cycle is called

A. Carnot cycle

B. Rankine cycle

C. Brayton cycle

D. Bell Coleman cycle

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4

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

A. Zero

B. 1/5

C. 4/5

D. 1

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4

If a material expands freely due to heating it will develop

A. Thermal stresses

B. Tensile stress

C. Bending

D. No stress

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4

The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

A. Increase

B. Decrease

C. Remain unchanged

D. Increase/decrease depending on application

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4

The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

A. Equal to one

B. Less than one

C. Greater than one

D. None of these

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4

A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is

A. T.ω watts

B. 2π. T.ω watts

C. 2π. T.ω/75 watts

D. 2π. T.ω/4500 watts

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4

The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.

A. Equal to

B. More than

C. Less than

D. None of these

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4

When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the minimum normal stress is

A. x/2) + (1/2) × √(σx² + 4 τ²xy)

B. x/2) - (1/2) × √(σx² + 4 τ²xy)

C. x/2) + (1/2) × √(σx² - 4 τ²xy)

D. (1/2) × √(σx² + 4 τ²xy)

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4

In the below figure, curve D represents_________.

A. Mild steel

B. Cast iron

C. Concrete

D. Bone of these

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4

Select the correct statement as per Charles' law

A. p.v = constant, if T is kept constant

B. v/T = constant, if p is kept constant

C. p/T = constant, if v is kept constant

D. T/p = constant, if v is kept constant

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4

The torque transmitted by a solid shaft of diameter (D) is (where τ = Maximum allowable shear stress)

A. π /4 × τ × D³

B. π /16 × τ × D³

C. π /32 × τ × D³

D. π /64 × τ × D³

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4

Which of the following is the extensive property of a thermodynamic system?

A. Pressure

B. Volume

C. Temperature

D. Density

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4

Which of the following is the correct statement?

A. All the reversible engines have the same efficiency.

B. All the reversible and irreversible engines have the same efficiency.

C. Irreversible engines have maximum efficiency.

D. All engines are designed as reversible in order to obtain maximum efficiency.

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4

Formula based on IS codes is based on

A. Straight line formula

B. Eulers formula

C. Rankines formula

D. Secant formula

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4

Slenderness of a column is zero when

A. Ends are firmly fixed

B. Column is supported on all sides throughout the length

C. Length is equal to radius of gyration

D. Length is twice the radius of gyration

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4

The section modulus of a circular section about an axis through its C.G., is

A. πd²/4

B. πd²/16

C. πd3/16

D. πd3/32

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4

Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. Kinetic theory of gases

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4

An open system is one in which

A. Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system

B. Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system

C. Both the heat and work as well as mass of the working substance crosses the boundary of the system

D. Neither the heat and work nor the mass of the working substance crosses the boundary of the system

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4

In order to know whether a column is long or short, we must know its

A. Ultimate shear stress of the column

B. Factor of safety

C. Torque resisting capacity

D. Slenderness ratio

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4

The compression ratio is the ratio of

A. Swept volume to total volume

B. Total volume to swept volume

C. Swept volume to clearance volume

D. Total volume to clearance volume

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4

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

A. Carnot cycle

B. Stirling cycle

C. Otto cycle

D. Diesel cycle

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4

High air-fuel ratio in gas turbines

A. Increases power output

B. Improves thermal efficiency

C. Reduces exhaust temperature

D. Do not damage turbine blades

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4

The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents

A. Heat absorbed

B. Heat rejected

C. Either (A) or (B)

D. None of these

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4

A thin cylindrical shell of diameter (D) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is

A. (m - 1)/ (2m - 1)

B. (2m - 1)/ (m - 1)

C. (m - 2)/ (3m - 4)

D. (m - 2)/ (5m - 4)

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4

Which of the following has the minimum atomic mass?

A. Oxygen

B. Sulphur

C. Nitrogen

D. Carbon