4

# Proof resilience per material is known as

Resilience

Proof resilience

Modulus of resilience

Toughness

C. Modulus of resilience

4

# The mass of excess air supplied is equal to

(23/100) × Mass of excess carbon

(23/100) × Mass of excess oxygen

(100/23) × Mass of excess carbon

(100/23) × Mass of excess oxygen

4

# In an extensive property of a thermodynamic system

Extensive heat is transferred

Extensive work is done

Extensive energy is utilised

None of these

4

# For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)

p v = constant, if T is kept constant

v/T = constant, if p is kept constant

p/T = constant, if v is kept constant

T/p = constant, if v is kept constant

4

0

1

γ

4

# For which material the Poisson's ratio is more than unity

Steel

Copper

Aluminium

None of the above

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

# If the value of n = 0 in the equation pvn = C, then the process is called

Constant volume process

Constant pressure process

Isothermal process

4

# The change in the unit volume of a material under tension with increase in its Poisson's ratio will

Increase

Decrease

Remain same

Increase initially and then decrease

4

# The efficiency of Joule cycle is

Greater than Carnot cycle

Less than Carnot cycle

Equal to Carnot cycle

None of these

4

# Hooke's law holds good up to

Yield point

Limit of proportionality

Breaking point

Elastic limit

4

0

1

γ

4

-100 MPa

250 MPa

300 MPa

400 MPa

4

Low

Very low

High

Very high

4

Equal to

One-half

Twice

Four times

4

0°C

273°C

273 K

None of these

4

Very low

Low

High

Very high

4

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

x/2) + (1/2) × √(σx² + 4 τ²xy)

x/2) - (1/2) × √(σx² + 4 τ²xy)

x/2) + (1/2) × √(σx² - 4 τ²xy)

(1/2) × √(σx² + 4 τ²xy)

4

# A fletched beam is used to

Change the shape of the beam

Effect the saving in material

Equalise the strength in tension and compression

Increase the cross-section of the beam

4

# The work ratio of a gas turbine plant is given by

(Net work output)/(Workdone by the turbine)

(Net work output)/(Heat supplied)

(Actual temperature drop)/(Isentropic temperature drop)

(Isentropic increase in temperature)/(Actual increase in temperature)

4

# Producer gas is obtained by

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

Carbonisation of bituminous coal

Passing steam over incandescent coke

Passing air and a large amount of steam over waste coal at about 650°C

4

# 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

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

Half the weight of bar applied at lower end

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

One fourth of weight of bar applied at lower end

4

3p/E × (2/m - 1)

3p/E × (2 - m)

3p/E × (1 - 2/m)

E/3p × (2/m - 1)

4

Mono-atomic

Di-atomic

Tri-atomic

Poly-atomic

4

# Which of the following statement is incorrect?

The liquid fuels consist of hydrocarbons.

The liquid fuels have higher calorific value than solid fuels.

The solid fuels have higher calorific value than liquid fuels.

A good fuel should have low ignition point.

4

# According to First law of thermodynamics,

Total internal energy of a system during a process remains constant

Total energy of a system remains constant

Workdone by a system is equal to the heat transferred by the system

Internal energy, enthalpy and entropy during a process remain constant

4

# Carnot cycle has maximum efficiency for

Petrol engine

Diesel engine

Reversible engine

Irreversible engine

4

Boyle's law

Charles' law

Gay-Lussac law

4

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

Tensile in both the material

Tensile in steel and compressive in copper

Compressive in steel and tensile in copper

Compressive in both the materials

4

# Which of the following statement is correct?

The stress is the pressure per unit area

The strain is expressed in mm

Hook's law holds good upto the breaking point

Stress is directly proportional to strain within elastic limit