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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

Correct Answer :

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


Related Questions

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4

When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called

A. Wood charcoal

B. Bituminous coal

C. Briquetted coal

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 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

Euler's formula holds good only for

A. Short columns

B. Long columns

C. Both short and long columns

D. Weak columns

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4

The measurement of a thermodynamic property known as temperature is based on

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. None of these

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4

Proof resilience per material is known as

A. Resilience

B. Proof resilience

C. Modulus of resilience

D. Toughness

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4

The efficiency and work ratio of a simple gas turbine cycle are

A. Very low

B. Low

C. High

D. Very high

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4

The gas constant (R) is equal to the __________ of two specific heats.

A. Sum

B. Difference

C. Product

D. Ratio

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4

The amount of heat generated per kg of fuel is known as

A. Calorific value

B. Heat energy

C. Lower calorific value

D. Higher calorific value

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4

A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to

A. wl/6

B. wl/3

C. wl

D. 2wl/3

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4

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

A. 400 MPa

B. 500 MPa

C. 900 MPa

D. 1400 MPa

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4

In a tensile test, near the elastic limit zone, the

A. Tensile strain increases more quickly

B. Tensile strain decreases more quickly

C. Tensile strain increases in proportion to the stress

D. Tensile strain decreases in proportion to the stress

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4

A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be

A. Tensile in both the material

B. Tensile in steel and compressive in copper

C. Compressive in steel and tensile in copper

D. Compressive in both the materials

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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

The variables which control the physical properties of a perfect gas are

A. Pressure exerted by the gas

B. Volume occupied by the gas

C. Temperature of the gas

D. All of these

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4

The heating of a gas at constant pressure is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Avogadro's law

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4

The efficiency of a Carnot engine depends on

A. Working substance

B. Design of engine

C. Size of engine

D. Temperatures of source and sink

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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

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

A. (σx/2) + (1/2) × √(σx² + 4 τ²xy)

B. (σx/2) - (1/2) × √(σx² + 4 τ²xy)

C. (σx/2) + (1/2) × √(σx² - 4 τ²xy)

D. (1/2) × √(σx² + 4 τ²xy)

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4

The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

A. Specific heat at constant volume

B. Specific heat at constant pressure

C. Kilo Joule

D. None of these

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4

Which of the following statement is wrong?

A. The closed cycle gas turbine plants are external combustion plants.

B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.

C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.

D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.

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4

The columns whose slenderness ratio is less than 80, are known as

A. Short columns

B. Long columns

C. Weak columns

D. Medium columns

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Which of the following statement is correct?

A. The stress is the pressure per unit area

B. The strain is expressed in mm

C. Hook's law holds good upto the breaking point

D. Stress is directly proportional to strain within elastic limit

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4

The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is

A. Same

B. Twice

C. Four times

D. Eight times

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The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight

A. Of same magnitude as that of bar and applied at the lower end

B. Half the weight of bar applied at lower end

C. Half of the square of weight of bar applied at lower end

D. One fourth of weight of bar applied at lower end

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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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Hooke's law holds good up to

A. Yield point

B. Limit of proportionality

C. Breaking point

D. Elastic limit

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The intensity of stress which causes unit strain is called

A. Unit mass

B. Modulus of rigidity

C. Bulk modulus

D. Modulus of Elasticity

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4

Workdone in a free expansion process is

A. Zero

B. Minimum

C. Maximum

D. Positive

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4

The state of stress at a point in a loaded member is shown in the below figure. The magnitude of maximum shear stress is

A. 10 MPa

B. 30 MPa

C. 50 MPa

D. 100 MPa

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4

Which of the following gas is mostly used in town for street and domestic lighting and heating?

A. Producer gas

B. Coal gas

C. Mond gas

D. Coke oven gas