4

# A cylindrical section having no joint is known as

Joint less section

Homogeneous section

Perfect section

Seamless section

D. Seamless section

4

# Which of the following statement is wrong?

The closed cycle gas turbine plants are external combustion plants.

In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.

The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.

In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.

4

# A fletched beam is used to

Change the shape of the beam

Effect the saving in material

Equalise the strength in tension and compression

Increase the cross-section of the beam

4

# If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

More

Less

Equal

Depends on other factors

4

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

Maximum calculated value

Minimum calculated value

Mean value

Extreme value

4

Equal to

Less than

More than

None of these

4

1 g

10 g

100 g

1000 g

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

# 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

4

One-half

One-third

Two-third

Three-fourth

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

# Which of the following statement is incorrect?

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

The liquid fuels consist of hydrocarbons

4

Equal to

Less than

More than

None of these

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

(p2/p1)γ - 1/ γ

(p1/p2)γ - 1/ γ

(v2/v1)γ - 1/ γ

(v1/v2)γ - 1/ γ

4

Boyle's law

Charles' law

Gay-Lussac law

4

# Modular ratio of two materials is the ratio of

Strains

Stress and strain

Shear stress and shear strain

Moduli and elasticity

4

# The measurement of a thermodynamic property known as temperature is based on

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

None of these

4

Greater than

Less than

Equal to

None of these

4

# When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, then

The stress and strain induced is compressive

The stress and strain induced is tensile

Both A and B is correct

None of these

4

Soft coal

Hard coal

Pulverised coal

Bituminous coal

4

# For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

Dual cycle, Diesel cycle, Otto cycle

Otto cycle, Diesel cycle, Dual cycle

Dual cycle, Otto cycle, Diesel cycle

Diesel cycle, Otto cycle, Dual cycle

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

# 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

# The efficiency of Carnot cycle depends upon

Temperature limits

Pressure ratio

Volume compression ratio

Cut-off ratio and compression ratio

4

# Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.

There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.

All of the above

4

Kh > Ks

Kh < Ks

Kh = Ks

None of these

4

W1 - 2 = 0

Q1 - 2 = 0

dU = 0

All of these

4

# A steel bar of 5 mm is heated from 25°C to 45°C and it is free to expand. The bar will induce

No stress

Shear stress

Tensile stress

Compressive stress

4

# The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

Law of equipartition of energy

Law of conservation of energy

None of these