A pressure vessel is said to be a thick shell, when
It is made of thick sheets
The internal pressure is very high
The ratio of wall thickness of the vessel to its diameter is less than 1/10.
The ratio of wall thickness of the vessel to its diameter is greater than 1/10.
Correct Answer :
D. The ratio of wall thickness of the vessel to its diameter is greater than 1/10.
Related Questions
The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)
√(KT/m)
√(2KT/m)
√(3KT/m)
√(5KT/m)
Percentage reduction of area in performing tensile test on cast iron may be of the order of
50 %
25 %
0 %
15 %
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
The value of gas constant (R) in S. I. units is
0.287 J/kgK
2.87 J/kgK
28.7 J/kgK
287 J/kgK
One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to
800 K
1000 K
1200 K
1400 K
A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is
T.ω watts
2π. T.ω watts
2π. T.ω/75 watts
2π. T.ω/4500 watts
When a gas is heated, change takes place in
Pressure
Volume
Temperature
All of these
The efficiency and work ratio of a simple gas turbine cycle are
Low
Very low
High
Very high
One kg of hydrogen requires 8 kg of oxygen and produces
1 kg of water
7 kg of water
8 kg of water
9 kg of water
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
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
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
Select the wrong statement
A Joule cycle consists of two constant volume and two isentropic processes.
An Otto cycle consists of two constant volume and two isentropic processes.
An Ericsson cycle consists of two constant pressure and two isothermal processes.
All of the above
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
The efficiency of Ericsson cycle is __________ Carnot cycle.
Greater than
Less than
Equal to
None of these
According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
Remains constant
Increases
Decreases
None of these
The increase in entropy of a system represents
Increase in availability of energy
Increase in temperature
Decrease in pressure
Degradation of energy
The weakest section of a diamond riveting is the section which passes through
The first row
The second row
The central row
One rivet hole of the end row
The rivets are used for __________ fastenings.
Permanent
Temporary
Semi-permanent
None of these
Resilience of a material is considered when it is subjected to
Frequent heat treatment
Fatigue
Creep
Shock loading
The atomic mass of oxygen is
12
14
16
32
Hooke's law holds good up to
Yield point
Limit of proportionality
Breaking point
Elastic limit
A column that fails due to direct stress, is called
Short column
Long column
Weak column
Medium column
The processes occuring in open system which permit the transfer of mass to and from the system, are known as
Flow processes
Non-flow processes
Adiabatic processes
None of these
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
For a simply supported beam of length l, when a concentrated load W is applied in the centre of the beam, the maximum deflection is
5WL³/ 384EI
WL³/384EI
WL³/ 348EI
WL³/ 48EI
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
Law of degradation of energy
None of these
The heat supplied to the gas at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)
mR (T2 - T1)
mcv (T2 - T1)
mcp (T2 - T1)
mcp (T2 + T1)
The natural petroleum may be separated into
Petrol
Kerosene
Fuel oil
Lubricating oil
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