4

Same

Double

Half

One-fourth

B. Double

4

30 kJ

54 kJ

84 kJ

114 kJ

4

# True stress strain-curve for materials is plotted between

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

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

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

Load/ instantaneous area and instantaneous area/original area

4

Workdone

Entropy

Enthalpy

None of these

4

# Kelvin-Planck's law deals with

Conservation of work

Conservation of heat

Conversion of heat into work

Conversion of work into heat

4

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

Steel only

Concrete only

Steel and concrete both

None of these

4

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

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

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

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

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

4

1.333 N/m2

13.33 N/m2

133.3 N/m2

1333 N/m2

4

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

More

Less

Equal

Depends on other factors

4

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

Simply supported beam

Fixed beam

Overhanging beam

Cantilever beam

4

2/3

3/4

1

9/8

4

# Proof resilience per material is known as

Resilience

Proof resilience

Modulus of resilience

Toughness

4

# For same compression ratio and for same heat added

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

Efficiency depends on other factors

Both Otto and Diesel cycles are equally efficient

4

# Shear stress induced in a shaft subjected to tension will be

Maximum at periphery and zero at center

Maximum at center

Uniform throughout

None of the above

4

Tensile

Compressive

Shear

Zero

4

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

Sum

Difference

Multiplication

None of the above

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

(σx/2) + (1/2) × √(σx² + 4 τ²xy)

(σx/2) - (1/2) × √(σx² + 4 τ²xy)

(σx/2) + (1/2) × √(σx² - 4 τ²xy)

(1/2) × √(σx² + 4 τ²xy)

4

# The buckling load for a given column depends upon

Area of cross-section of the column

Length and least radius of gyration of the column

Modulus of elasticity for the material of the column

All of the above

4

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

Two constant pressure

Two constant volume

Two isentropic

One constant pressure, one constant volume

4

10 MPa

30 MPa

50 MPa

100 MPa

4

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

Tensile stress

Compressive stress

Shear stress

Thermal stress

4

# Hooke's law holds good up to

Yield point

Limit of proportionality

Breaking point

Elastic limit

4

65° to 220°C

220° to 345°C

345° to 470°C

470° to 550°C

4

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

Specific heat at constant volume

Specific heat at constant pressure

Kilo Joule

None of these

4

# The extremeties of any diameter on Mohr's circle represent

Principal stresses

Normal stresses on planes at 45°

Shear stresses on planes at 45°

Normal and shear stresses on a plane

4

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

Law of equipartition of energy

Law of conservation of energy

None of these

4

π /4 × τ × D³

π /16 × τ × D³

π /32 × τ × D³

π /64 × τ × D³

4

Wood charcoal

Bituminous coke

Pulverised coal

Coke

4

# Which is the false statement about true stress strain method?

It does not exist

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

It gives a more accurate picture of the ductility

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

4

# The following cycle is used for air craft refrigeration

Brayton cycle

Joule cycle

Carnot cycle

Reversed Brayton cycle