4

# Tensile strength of a material is obtained by dividing the maximum load during the test by the

Area at the time of fracture

Original cross-sectional area

Average of (A) and (B)

Minimum area after fracture

B. Original cross-sectional area

4

9/7

11/7

7/4

1/4

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

M/I = σ/y = E/R

T/J = τ/R = Cθ/l

M/R = T/J = Cθ/l

T/l= τ/J = R/Cθ

4

Soft coal

Hard coal

Pulverised coal

Bituminous coal

4

Equal to

Less than

More than

None of these

4

wl/4

wl/2

wl

wl²/2

4

# When a perfect gas is expanded through an aperture of minute dimensions, the process is known as

Isothermal process

Free expansion process

Throttling process

4

# When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as

Young's modulus

Modulus of rigidity

Bulk modulus

Poisson's ratio

4

Remains constant

Increases

Decreases

None of these

4

# Principal planes are planes having

Maximum shear stress

No shear stress

Minimum shear stress

None of the above

4

237°C

-273°C

-237°C

273°C

4

# A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under

Uniform throughout

Increase uniformly

First increase and then decrease

Increase uniformly first and then increase rapidly

4

# The assumption made in Euler's column theory is that

The failure of column occurs due to buckling alone

The length of column is very large as compared to its cross-sectional dimensions

The column material obeys Hooke's law

All of the above

4

Shear modulus

Section modulus

Polar modulus

None of these

4

1 - rγ - 1

1 + rγ - 1

1 - (1/ rγ - 1)

1 + (1/ rγ - 1)

4

# The gas constant (R) is equal to the

Sum of two specific heats

Difference of two specific heats

Product of two specific heats

Ratio of two specific heats

4

1.013 bar

760 mm of Hg

1013 × 102 N/m2

All of these

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

Equal to

Less than

Greater than

None of these

4

# A masonry dam may fail due to

Tension in the masonry of the dam and its base

Overturning of the dam

Crushing of masonry at the base of the dam

Any one of the above

4

πd²/4

πd²/16

πd3/16

πd3/32

4

10 MPa

30 MPa

50 MPa

100 MPa

4

# The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of

One right angled triangle

Two right angled triangles

One equilateral triangle

Two equilateral triangles

4

Carnot cycle

Stirling cycle

Otto cycle

None of these

4

K₁ K₂

(K₁ + K₂)/ 2

(K₁ + K₂)/ K₁ K₂

K₁ K₂/ (K₁ + K₂)

4

# Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

(p1 v1 - p2 v2)/(γ - 1)

[m R (T1 - T2)] /(γ - 1)

[m R T1/(γ - 1)][1 - (p2 v2 /p1 v1)]

All 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

Equal to

Less than

More than

None of these

4

# A beam is loaded as cantilever. If the load at the end is increased, the failure will occur

In the middle

At the tip below the load

At the support

Anywhere