4

# Young's modulus is defined as the ratio of

Volumetric stress and volumetric strain

Lateral stress and lateral strain

Longitudinal stress and longitudinal strain

Shear stress to shear strain

C. Longitudinal stress and longitudinal strain

4

# In S. I. units, the value of the universal gas constant is

8.314 J/kg mole-K

83.14 J/kgmole-K

831.4 J/kgmole-K

8314 J/kgmole-K

4

Soft coal

Hard coal

Pulverised coal

Bituminous coal

4

# Select the correct statement as per Charles' law

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

# Strain re-setters are used to

Measure shear strain

Measure linear strain

Measure volumetric strain

Relieve strain

4

3p/E × (2/m - 1)

3p/E × (2 - m)

3p/E × (1 - 2/m)

E/3p × (2/m - 1)

4

Short column

Long column

Weak column

Medium column

4

1 N-m

1 kN-m

10 N-m/s

10 kN-m/s

4

# When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Kelvin Planck's law

4

πd²/4

πd²/16

πd3/16

πd3/32

4

# For the same maximum pressure and temperature,

Otto cycle is more efficient than Diesel cycle

Diesel cycle is more efficient than Otto cycle

Dual cycle is more efficient than Otto and Diesel cycles

Dual cycle is less efficient than Otto and Diesel cycles

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

Mild steel

Cast iron

Concrete

Bone of these

4

# If a part is constrained to move and heated, it will develop

Principal stress

Tensile stress

Compressive stress

Shear stress

4

Boyle's law

Charles' law

Gay-Lussac law

4

# Diesel cycle consists of __________ processes.

Two constant volume and two isentropic

Two constant pressure and two isentropic

Two constant volume and two isothermal

One constant pressure, one constant volume and two isentropic

4

p.t.σt

d.t.σc

π/4 × d² × σt

π/4 × d² × σc

4

# A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the

Perpendicular to the axis of load

Maximum moment of inertia

Minimum moment of inertia

4

Not deform

Be safest

Stretch

Not stretch

4

# Diesel cycle consists of following four processes

Two isothermal and two isentropic

Two isentropic and two constant volumes

Two isentropic, one constant volume and one constant pressure

Two isentropic and two constant pressures

4

l/8

l/4

l/2

l

4

Same

Lower

Higher

None of these

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

Isothermally

Isentropically

Polytropically

None of these

4

kJ

kJ/kg

kJ/m2

kJ/m3

4

11/7

9/7

4/7

All of the above

4

400 MPa

500 MPa

900 MPa

1400 MPa

4

(p2/p1)γ - 1/ γ

(p1/p2)γ - 1/ γ

(v2/v1)γ - 1/ γ

(v1/v2)γ - 1/ γ

4

# The strain energy stored in a solid circular shaft in torsion, subjected to shear stress (τ), is: (Where, G = Modulus of rigidity for the shaft material)

τ²/ 2G × Volume of shaft

τ/ 2G × Volume of shaft

τ²/ 4G × Volume of shaft

τ/ 4G × Volume of shaft

4

1.333 N/m2

13.33 N/m2

133.3 N/m2

1333 N/m2