4

# In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be

Increase key length

Increase key depth

Increase key width

Double all the dimensions

C. Increase key width

4

Boyle's law

Charles' law

Gay-Lussac law

Joule's law

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

# When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the minimum normal stress is

x/2) + (1/2) × √(σx² + 4 τ²xy)

x/2) - (1/2) × √(σx² + 4 τ²xy)

x/2) + (1/2) × √(σx² - 4 τ²xy)

(1/2) × √(σx² + 4 τ²xy)

4

# Hooke's law holds good up to

Yield point

Limit of proportionality

Breaking point

Elastic limit

4

# The work ratio of simple gas turbine cycle depends upon

Maximum cycle temperature

Minimum cycle temperature

Pressure ratio

All of these

4

Equal to

Less than

Greater than

None of these

4

Zero

Minimum

Maximum

Positive

4

# According to First law of thermodynamics,

Total internal energy of a system during a process remains constant

Total energy of a system remains constant

Workdone by a system is equal to the heat transferred by the system

Internal energy, enthalpy and entropy during a process remain constant

4

Same

Twice

Four times

Eight times

4

t

2t

4t

8t

4

Carnot cycle

Stirling cycle

Ericsson cycle

Joule cycle

4

# The stress necessary to initiate yielding is

Considerably greater than that necessary to continue it

Considerably lesser than that necessary to continue it

Greater than that necessary to stop it

Lesser than that necessary to stop it

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

# Diesel cycle consists of __________ processes.

Two constant volume and two isentropic

Two constant pressure and two isentropic

Two constant volume and two isothermal

One constant pressure, one constant volume and two isentropic

4

Greater than

Less than

Equal to

None of these

4

12

14

16

32

4

1 N-m/s

100 N-m

1000 N-m/s

1 × 106 N-m/s

4

1 N-m

1 kN-m

10 N-m/s

10 kN-m/s

4

# Strain is defined as the ratio of

Change in volume to original volume

Change in length to original length

Change in cross-sectional area to original cross-sectional area

Any one of the above

4

pv = mRT

pv = RTm

pvm = C

pv = (RT)m

4

Shear modulus

Section modulus

Polar modulus

None of these

4

# When a gas is heated at constant pressure

Its temperature will increase

Its volume will increase

Both temperature and volume will increase

Neither temperature not volume will increase

4

5WL³/ 384EI

WL³/384EI

WL³/ 348EI

WL³/ 48EI

4

# Carnot cycle has maximum efficiency for

Petrol engine

Diesel engine

Reversible engine

Irreversible engine

4

1 - rγ - 1

1 + rγ - 1

1 - (1/ rγ - 1)

1 + (1/ rγ - 1)

4

# Flow stress corresponds to

Fluids in motion

Breaking point

Plastic deformation of solids

Rupture stress

4

Elements

Compounds

Atoms

Molecules

4

# The unit of energy is S. I. units is

Joule (J)

Joule metre (Jm)

Watt (W)

Joule/metre (J/m)

4

# Strain energy is the

Energy stored in a body when strained within elastic limits

Energy stored in a body when strained up to the breaking of a specimen

Maximum strain energy which can be stored in a body

Proof resilience per unit volume of a material