4

# The buckling load for a given material depends on

Slenderness ratio and area of cross-section

Poisson's ratio and modulus of elasticity

Slenderness ratio and modulus of elasticity

Slenderness ratio, area of cross-section and modulus of elasticity

D. Slenderness ratio, area of cross-section and modulus of elasticity

4

# The safe twisting moment for a compound shaft is equal to the

Maximum calculated value

Minimum calculated value

Mean value

Extreme value

4

# When the gas is cooled at constant pressure,

Its temperature increases but volume decreases

Its volume increases but temperature decreases

Both temperature and volume increases

Both temperature and volume decreases

4

# High air-fuel ratio in gas turbines

Increases power output

Improves thermal efficiency

Reduces exhaust temperature

4

400 MPa

500 MPa

900 MPa

1400 MPa

4

Thermal stresses

Tensile stress

Bending

No stress

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

# 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

4

Greater than

Less than

Equal to

None of these

4

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

Principal stress

Tensile stress

Compressive stress

Shear stress

4

# Brayton cycle consists' of following four processes

Two isothermals 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

-140 kJ

-80 kJ

-40 kJ

+60 kJ

4

Equal to

Less than

More than

None of these

4

# Within elastic limit, stress is

Inversely proportional to strain

Directly proportional to strain

Square root of strain

Equal to strain

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

# The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is

In the vertical plane

In the horizontal plane

In the same plane in which the beam bends

At right angle to the plane in which the beam bends

4

# A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

Cracking

Carbonisation

Fractional distillation

Full distillation

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

-273°C

73°C

237°C

-237°C

4

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

Steel

Copper

Aluminium

None of the above

4

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

Frequent heat treatment

Fatigue

Creep

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

4/7

11/4

9/7

All of these

4

3 to 6

5 to 8

15 to 20

20 to 30

4

# The efficiency of a gas turbine 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

# The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by

E = 3K.C/(3K + C)

E = 6K.C/(3K + C)

E = 9K.C/(3K + C)

E = 12K.C/(3K + C)

4

Short columns

Long columns

Weak columns

Medium columns

4

# The efficiency of Carnot cycle is maximum for

Gas engine

Petrol engine

Steam engine

Reversible engine

4

# Diamond riveted joint can be adopted in the case of following type of joint

Butt joint

Lap joint

Double riveted lap joints

All types of joints

4

# Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Kinetic theory of gases