4

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

Maximum calculated value

Minimum calculated value

Mean value

Extreme value

B. Minimum calculated value

4

# In order to know whether a column is long or short, we must know its

Ultimate shear stress of the column

Factor of safety

Torque resisting capacity

Slenderness ratio

4

# The efficiency of Joule cycle is

Greater than Carnot cycle

Less than Carnot cycle

Equal to Carnot cycle

None of these

4

# A column is said to be a short column, when

Its length is very small

Its cross-sectional area is small

The ratio of its length to the least radius of gyration is less than 80

The ratio of its length to the least radius of gyration is more than 80

4

# The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

Carnot cycle can't work with saturated steam

Heat is supplied to water at temperature below the maximum temperature of the cycle

A Rankine cycle receives heat at two places

Rankine cycle is hypothetical

4

Equal to

Half

Double

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

More than 50 %

25-50 %

10-25 %

Negligible

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

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

Malleability

Ductility

Plasticity

Elasticity

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

# The gas turbine cycle with regenerator improves

Thermal efficiency

Work ratio

Avoids pollution

None of these

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

1 - rγ - 1

1 + rγ - 1

1 - (1/ rγ - 1)

1 + (1/ rγ - 1)

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

4

Same

More

Less

Unpredictable

4

# The deformation per unit length is called

Tensile stress

Compressive stress

Shear stress

Strain

4

# Which of the following cycles is not a reversible cycle?

Carnot

Ericsson

Stirling

None of the above

4

1 g

10 g

100 g

1000 g

4

Greater than

Less than

Equal to

None of these

4

Tensile

Compressive

Shear

Zero

4

# When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.

Equal to

Directly proportional to

Inversely proportional to

Independent of

4

Smaller end

Larger end

Middle

Anywhere

4

Heat

Work

Internal energy

Entropy

4

Wood charcoal

Bituminous coke

Pulverised coal

Coke

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

l/δl

δl/l

l.δl

l + δl

4

# The volumetric or molar specific heat at constant pressure is the product of

Molecular mass of the gas and the specific heat at constant volume

Atomic mass of the gas and the gas constant

Molecular mass of the gas and the gas constant

None of the above

4

# The efficiency of Carnot cycle is maximum for

Gas engine

Petrol engine

Steam engine

Reversible engine