4

# The ratio of the largest load in a test to the original cross-sectional area of the test piece is called

Elastic limit

Yield stress

Ultimate stress

Breaking stress

C. Ultimate stress

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

Same

Half

Two times

Four times

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

# If the radius of wire stretched by a load is doubled, then its Youngs modulus will be

Doubled

Halved

Becomes four times

None of the above

4

# The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

Increase

Decrease

Remain unchanged

Increase/decrease depending on application

4

Boyle's law

Charles' law

Gay-Lussac law

4

# Which of the following is the correct statement?

All the reversible engines have the same efficiency.

All the reversible and irreversible engines have the same efficiency.

Irreversible engines have maximum efficiency.

All engines are designed as reversible in order to obtain maximum efficiency.

4

Greater than

Less than

Equal to

None of these

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

# Stirling and Ericsson cycles are

Reversible cycles

Irreversible cycles

Semi-reversible cycles

Quasi-static cycles

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

# When both ends of a column are fixed, the effective length is

Its own length

Twice its length

Half its length

1/√2 × its length

4

# The isothermal and adiabatic processes are regarded as

Reversible process

Irreversible process

Reversible or irreversible process

None of these

4

Rankine

Stirling

Carnot

Brayton

4

Mild steel

Cast iron

Concrete

Bone of these

4

# Carbonisation of coal consists of

Drying and crushing the coal to a fine powder

Moulding the finely ground coal under pressure with or without a binding material

Heating the wood with a limited supply of air to temperature not less than 280°C

None of the above

4

3p/E × (2/m - 1)

3p/E × (2 - m)

3p/E × (1 - 2/m)

E/3p × (2/m - 1)

4

Volume

Temperature

Mass

Energy

4

Isothermally

Isentropically

Polytropically

None of these

4

d/4

d/8

d/12

d/16

4

# In a steady flow process, the ratio of

Heat transfer is constant

Work transfer is constant

Mass flow at inlet and outlet is same

All of these

4

wl²/3√3

wl²/6√3

wl²/9√3

wl²/12√3

4

# The main cause for the irreversibility is

Mechanical and fluid friction

Unrestricted expansion

Heat transfer with a finite temperature difference

All of the above

4

# The efficiency of Diesel cycle depends upon

Temperature limits

Pressure ratio

Compression ratio

Cut-off ratio and compression ratio

4

2

8

16

32

4

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

Carnot

Ericsson

Stirling

None of the above

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

# A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the

Perpendicular to the axis of load

Maximum moment of inertia

Minimum moment of inertia

4

# If the value of n = 0 in the equation pvn = C, then the process is called

Constant volume process

Constant pressure process

Isothermal process