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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

Correct Answer :

D. No stress


Related Questions

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4

The weakest section of a diamond riveting is the section which passes through

A. The first row

B. The second row

C. The central row

D. One rivet hole of the end row

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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

What is the correct answer?

4

Kelvin-Planck's law deals with

A. Conservation of work

B. Conservation of heat

C. Conversion of heat into work

D. Conversion of work into heat

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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 buckling load for a given column depends upon

A. Area of cross-section of the column

B. Length and least radius of gyration of the column

C. Modulus of elasticity for the material of the column

D. All of the above

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4

Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m.

A. The shaft 'B' has the greater diameter

B. The shaft 'A' has the greater diameter

C. Both are of same diameter

D. None of these

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4

The hard coke is obtained when carbonisation of coal is carried out at

A. 300° to 500°C

B. 500° to 700°C

C. 700° to 900°C

D. 900° to 1100°C

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4

In the below figure, the plastic range occurs

A. Before point A

B. Beyond point A

C. Between points A and D

D. Between points D and E

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4

The fuel mostly used in blast furnace for extracting pig iron from iron ores is

A. Hard coke

B. Soft coke

C. Pulverised coal

D. Bituminous coal

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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 efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.

A. Greater than

B. Less than

C. Equal to

D. None of these

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4

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

The atomic mass of nitrogen is __________ oxygen.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The absolute zero temperature is taken as

A. -273°C

B. 73°C

C. 237°C

D. -237°C

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4

The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.

A. 1 g

B. 10 g

C. 100 g

D. 1000 g

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4

The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)

A. √(KT/m)

B. √(2KT/m)

C. √(3KT/m)

D. √(5KT/m)

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4

If the radius of wire stretched by a load is doubled, then its Youngs modulus will be

A. Doubled

B. Halved

C. Becomes four times

D. None of the above

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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

For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

A. Dual cycle, Diesel cycle, Otto cycle

B. Otto cycle, Diesel cycle, Dual cycle

C. Dual cycle, Otto cycle, Diesel cycle

D. Diesel cycle, Otto cycle, Dual cycle

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4

In a uniform bar, supported at one end in position, the maximum stress under self weight of bar shall occur at the

A. Middle of bar

B. Supported end

C. Bottom end

D. None of these

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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

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

The distance between the centres of the rivets in adjacent rows of zigzag riveted joint is known as

A. Pitch

B. Back pitch

C. Diagonal pitch

D. Diametric pitch

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4

In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be

A. Increase key length

B. Increase key depth

C. Increase key width

D. Double all the dimensions

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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

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

A cube subjected to three mutually perpendicular stress of equal intensity p expenses a volumetric strain

A. 3p/E × (2/m - 1)

B. 3p/E × (2 - m)

C. 3p/E × (1 - 2/m)

D. E/3p × (2/m - 1)

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4

In the below figure, the stress corresponding to point D is

A. Yield point stress

B. Breaking stress

C. Ultimate stress

D. Elastic limit

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4

The shear force diagram of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length will be

A. A right angled triangle

B. An isosceles triangle

C. An equilateral triangle

D. A rectangle

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4

One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

A. 4/7

B. 11/4

C. 9/7

D. All of these