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What is the correct answer?

4

The general law for the expansion or compression of gases, is

A. pv = C

B. pv = m R T

C. pvn = C

D. pvγ = C

Correct Answer :

C. pvn = C


Related Questions

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4

One Joule (J) is equal to

A. 1 N-m

B. 1 kN-m

C. 10 N-m/s

D. 10 kN-m/s

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4

The work ratio of simple gas turbine cycle depends upon

A. Maximum cycle temperature

B. Minimum cycle temperature

C. Pressure ratio

D. All of these

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4

Diesel cycle consists of following four processes

A. Two isothermal and two isentropic

B. Two isentropic and two constant volumes

C. Two isentropic, one constant volume and one constant pressure

D. Two isentropic and two constant pressures

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4

The efficiency of Stirling cycle is __________ Carnot cycle.

A. Greater than

B. Less than

C. Equal to

D. None of these

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4

Brayton cycle consists' of following four processes

A. Two isothermals and two isentropic

B. Two isentropic and two constant volumes

C. Two isentropic, one constant volume and one constant pressure

D. Two isentropic and two constant pressures

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4

When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.

A. Equal to

B. Directly proportional to

C. Inversely proportional to

D. Independent of

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4

A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

A. Cracking

B. Carbonisation

C. Fractional distillation

D. Full distillation

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4

In the torsion equation T/J = τ/r = Gθ/ L, the term J/R is called

A. Shear modulus

B. Section modulus

C. Polar modulus

D. None of these

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4

The polytropic index (n) is given by

A. log (p1p2)/log (v1v2)

B. log (p2/ p1)/log (v1/ v2)

C. log (v1/ v2)/ log (p1/p2)

D. log [(p1v1)/(p2v2)]

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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

Strain re-setters are used to

A. Measure shear strain

B. Measure linear strain

C. Measure volumetric strain

D. Relieve strain

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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

A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.

A. Same

B. Lower

C. Higher

D. None of these

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4

The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)

A. t

B. 2t

C. 4t

D. 8t

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4

The following cycle is used for air craft refrigeration

A. Brayton cycle

B. Joule cycle

C. Carnot cycle

D. Reversed Brayton cycle

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4

The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)

A. pv = mRT

B. pv = RTm

C. pvm = C

D. pv = (RT)m

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4

The calorific value of gaseous fuel is expressed in

A. kJ

B. kJ/kg

C. kJ/m2

D. kJ/m3

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4

The mass of flue gas per kg of fuel is the ratio of the

A. Mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel

B. Mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas

C. Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel

D. Mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas

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4

True stress strain-curve for materials is plotted between

A. Load/original cross-sectional area and change in length/original length

B. Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)

C. Load/ instantaneous cross-sectional area and change in length/ original length

D. Load/ instantaneous area and instantaneous area/original area

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4

A material obeys hooks law up to

A. Plastic limit

B. Elastic limit

C. Yield point

D. Limit of proportionality

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4

The percentage reduction in area of a cast iron specimen during tensile test would be of the order of

A. More than 50 %

B. 25-50 %

C. 10-25 %

D. Negligible

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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

Which of the following statement is correct?

A. The heat and work are boundary phenomena

B. The heat and work represent the energy crossing the boundary of the system

C. The heat and work are path functions

D. All of the above

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4

In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are

A. Equal

B. Proportional to their respective moduli of elasticity

C. Inversely proportional to their moduli of elasticity

D. Average of the sum of moduli of elasticity

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4

Which of the following process can be made reversible with the help of a regenerator?

A. Constant pressure process

B. Constant volume process

C. Constant pvn process

D. All of these

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4

The state of a substance whose evaporation from its liquid state is complete, is known as

A. Vapour

B. Perfect gas

C. Air

D. Steam

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4

Otto cycle is also known as

A. Constant pressure cycle

B. Constant volume cycle

C. Constant temperature cycle

D. Constant temperature and pressure cycle

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4

The oxygen atom is ________ times heavier than the hydrogen atom.

A. 2

B. 8

C. 16

D. 32

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4

When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. Kelvin Planck's law

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4

The layer at the centre of gravity of the beam as shown in the below figure, will be

A. In tension

B. In compression

C. Neither in tension nor in compression

D. None of these