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4

If in the equation pvn = C, the value of n = ∝, then the process is called

A. Constant volume process

B. Adiabatic process

C. Constant pressure process

D. Isothermal process

Correct Answer :

A. Constant volume process


Related Questions

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4

The entropy may be expressed as a function of

A. Pressure and temperature

B. Temperature and volume

C. Heat and work

D. All of these

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4

The neutral axis of the cross-section a beam is that axis at which the bending stress is

A. Zero

B. Minimum

C. Maximum

D. Infinity

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4

A beam is loaded as cantilever. If the load at the end is increased, the failure will occur

A. In the middle

B. At the tip below the load

C. At the support

D. Anywhere

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4

One molecule of oxygen is __________ times heavier than the hydrogen atom.

A. 12

B. 14

C. 16

D. 32

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4

Which of the following gas has a minimum molecular mass?

A. Oxygen

B. Nitrogen

C. Hydrogen

D. Methane

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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 maximum shear 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

One kg of carbon produces __________ kg of carbon dioxide.

A. 3/7

B. 7/3

C. 11/3

D. 3/11

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4

Select the wrong statement

A. A Joule cycle consists of two constant volume and two isentropic processes.

B. An Otto cycle consists of two constant volume and two isentropic processes.

C. An Ericsson cycle consists of two constant pressure and two isothermal processes.

D. All of the above

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4

Which of the following statement is incorrect?

A. The liquid fuels have higher calorific value than solid fuels

B. The solid fuels have higher calorific value than liquid fuels

C. A good fuel should have low ignition point

D. The liquid fuels consist of hydrocarbons

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4

The efficiency of the Carnot cycle may be increased by

A. Increasing the highest temperature

B. Decreasing the highest temperature

C. Increasing the lowest temperature

D. Keeping the lowest temperature constant

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4

Shear stress induced in a shaft subjected to tension will be

A. Maximum at periphery and zero at center

B. Maximum at center

C. Uniform throughout

D. None of the above

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4

In S. I. units, the value of the universal gas constant is

A. 8.314 J/kg mole-K

B. 83.14 J/kgmole-K

C. 831.4 J/kgmole-K

D. 8314 J/kgmole-K

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4

The unit of energy is S. I. units is

A. Joule (J)

B. Joule metre (Jm)

C. Watt (W)

D. Joule/metre (J/m)

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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

The bending equation is

A. M/I = σ/y = E/R

B. T/J = τ/R = Cθ/l

C. M/R = T/J = Cθ/l

D. T/l= τ/J = R/Cθ

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4

When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

A. Top layer

B. Bottom layer

C. Neutral axis

D. Every cross-section

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4

A composite shaft consisting of two stepped portions having spring constants K₁ and K₂ is held between two rigid supports at the ends. Its equivalent spring constant is

A. K₁ K₂

B. (K₁ + K₂)/ 2

C. (K₁ + K₂)/ K₁ K₂

D. K₁ K₂/ (K₁ + K₂)

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4

In closed cycle gas turbine, the air is compressed

A. Isothermally

B. Isentropically

C. Polytropically

D. None of these

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4

For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)

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 heating of gas at constant volume is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Avogadro's law

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4

The shape of cantilever for uniformly distributed load will be

A. Straight line

B. Parabolic

C. Elliptical

D. Cubic

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4

The change of entropy, when heat is absorbed by the gas, is

A. Positive

B. Negative

C. Positive or negative

D. None of these

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4

If a part is constrained to move and heated, it will develop

A. Principal stress

B. Tensile stress

C. Compressive stress

D. Shear stress

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4

The absolute zero temperature is taken as

A. 237°C

B. -273°C

C. -237°C

D. 273°C

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4

The efficiency of Ericsson cycle is __________ Carnot cycle.

A. Greater than

B. Less than

C. Equal to

D. None of these

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4

When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring (δ) is given by (where d = Diameter of spring wire, n = No. of turns of the spring, and C = Modulus of rigidity for the spring material)

A. WD3n/Cd⁴

B. 2WD3n/Cd⁴

C. 4WD3n/Cd⁴

D. 8WD3n/Cd⁴

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4

The efficiency of Carnot cycle depends upon

A. Temperature limits

B. Pressure ratio

C. Volume compression ratio

D. Cut-off ratio and compression ratio

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4

Strain energy is the

A. Energy stored in a body when strained within elastic limits

B. Energy stored in a body when strained up to the breaking of a specimen

C. Maximum strain energy which can be stored in a body

D. Proof resilience per unit volume of a material

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4

The ideal efficiency of a Brayton cycle without 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 thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

A. rγ - 1

B. 1 - rγ - 1

C. 1 - (1/r) γ/γ - 1

D. 1 - (1/r) γ - 1/ γ