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4

A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be

A. Same

B. Double

C. Half

D. One-fourth

Correct Answer :

B. Double


Related Questions

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4

A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

A. 30 kJ

B. 54 kJ

C. 84 kJ

D. 114 kJ

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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

The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

A. Workdone

B. Entropy

C. Enthalpy

D. None of these

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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 moment of resistance of a balanced reinforced concrete beam is based on the stresses in

A. Steel only

B. Concrete only

C. Steel and concrete both

D. None of these

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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

The value of 1 mm of Hg is equal to

A. 1.333 N/m2

B. 13.33 N/m2

C. 133.3 N/m2

D. 1333 N/m2

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4

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

A. More

B. Less

C. Equal

D. Depends on other factors

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4

A beam which is fixed at one end and free at the other is called

A. Simply supported beam

B. Fixed beam

C. Overhanging beam

D. Cantilever beam

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4

The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is

A. 2/3

B. 3/4

C. 1

D. 9/8

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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

For same compression ratio and for same heat added

A. Otto cycle is more efficient than Diesel cycle

B. Diesel cycle is more efficient than Otto cycle

C. Efficiency depends on other factors

D. Both Otto and Diesel cycles are equally efficient

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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

A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be

A. Tensile

B. Compressive

C. Shear

D. Zero

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4

The bending moment at a point on a beam is the algebraic ________ of all the moments on either side of the point.

A. Sum

B. Difference

C. Multiplication

D. None of the above

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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 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

A cycle consisting of __________ and two isothermal processes is known as Stirling cycle.

A. Two constant pressure

B. Two constant volume

C. Two isentropic

D. One constant pressure, one constant volume

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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

When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Thermal stress

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4

Hooke's law holds good up to

A. Yield point

B. Limit of proportionality

C. Breaking point

D. Elastic limit

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4

Kerosene is distilled at

A. 65° to 220°C

B. 220° to 345°C

C. 345° to 470°C

D. 470° to 550°C

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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

The extremeties of any diameter on Mohr's circle represent

A. Principal stresses

B. Normal stresses on planes at 45°

C. Shear stresses on planes at 45°

D. Normal and shear stresses on a plane

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4

The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

A. Law of equipartition of energy

B. Law of conservation of energy

C. Law of degradation of energy

D. None of these

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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

The fuel mostly used in cement industry and in metallurgical processes is

A. Wood charcoal

B. Bituminous coke

C. Pulverised coal

D. Coke

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4

Which is the false statement about true stress strain method?

A. It does not exist

B. It is more sensitive to changes in both metallurgical and mechanical conditions

C. It gives a more accurate picture of the ductility

D. It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.

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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 efficiency and work ratio of a simple gas turbine cycle are

A. Low

B. Very low

C. High

D. Very high