4

# In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are

Equal

Proportional to their respective moduli of elasticity

Inversely proportional to their moduli of elasticity

Average of the sum of moduli of elasticity

B. Proportional to their respective moduli of elasticity

4

# The point of contra flexure is a point where

Shear force changes sign

Shear force is maximum

Bending moment changes sign

Bending moment is maximum

4

1

0

-1

10

4

Heat

Work

Internal energy

Entropy

4

One-half

One-third

Two-third

Three-fourth

4

30°

45°

90°

4

# The efficiency of the Carnot cycle may be increased by

Increasing the highest temperature

Decreasing the highest temperature

Increasing the lowest temperature

Keeping the lowest temperature constant

4

# Coke is produced

When coal is first dried and then crushed to a fine powder by pulverising machine

From the finely ground coal by moulding under pressure with or without a binding material

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

By heating wood with a limited supply of air to a temperature not less than 280°C

4

More than 50 %

25-50 %

10-25 %

Negligible

4

# In the below figure, the plastic range occurs

Before point A

Beyond point A

Between points A and D

Between points D and E

4

# The efficiency of Joule cycle is

Greater than Carnot cycle

Less than Carnot cycle

Equal to Carnot cycle

None of these

4

Half

Same amount

Double

One-fourth

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

# Resilience of a material is considered when it is subjected to

Frequent heat treatment

Fatigue

Creep

4

# A cantilever beam is one which is

Fixed at both ends

Fixed at one end and free at the other end

Supported at its ends

Supported on more than two supports

4

50 %

25 %

20 %

30 %

4

3 to 6

5 to 8

10 to 20

15 to 30

4

# A thin cylindrical shell of diameter (D) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is

(m - 1)/ (2m - 1)

(2m - 1)/ (m - 1)

(m - 2)/ (3m - 4)

(m - 2)/ (5m - 4)

4

# In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is

More

Less

Same

More/less depending on composition

4

# After reaching the yielding stage while testing a mild steel specimen, strain

Becomes constant

Starts decreasing

Increases without any increase in load

None of the above

4

300° to 500°C

500° to 700°C

700° to 900°C

900° to 1100°C

4

# An open system is one in which

Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system

Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system

Both the heat and work as well as mass of the working substance crosses the boundary of the system

Neither the heat and work nor the mass of the working substance crosses the boundary of the system

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

Greater than

Less than

Equal to

None of these

4

# The strain energy stored in a solid circular shaft 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

Boyle's law

Charles' law

Gay-Lussac law

All of these

4

# The isothermal and adiabatic processes are regarded as

Reversible process

Irreversible process

Reversible or irreversible process

None of these

4

# Which of the following is correct?

Absolute pressure = Gauge pressure + Atmospheric pressure

Gauge pressure = Absolute pressure + Atmospheric pressure

Atmospheric pressure = Absolute pressure + Gauge pressure

Absolute pressure = Gauge pressure - Atmospheric pressure

4

# The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

Cracking

Carbonisation

Fractional distillation

Full distillation

4

# The torsional rigidity of a shaft is expressed by the

Maximum torque it can transmit

Number of cycles it undergoes before failure

Elastic limit up to which it resists torsion, shear and bending stresses

Torque required to produce a twist of one radian per unit length of shaft