A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.
6
18
38
52
Correct Answer :
B. 18
Related Questions
Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution
A1 is more alkaline than solution A2
A1 is highly acidic
A2 is very slightly acidic
Both (B) & (C)
Joule-Thomson co-efficient is the ratio of
Pressure change to temperature change occuring during adiabatic compression of a gas
Pressure change to temperature change occuring during adiabatic throttling of a gas
Temperature change to pressure change occuring during adiabatic compression of a gas
Temperature change to pressure change occuring during adiabatic throttling of a gas
Increase in temperature, in general results in the
Decrease in the viscosities of both liquids & gases
Increase in the viscosities of both liquids & gases
Increase in the viscosity of liquids and decrease in that of gases
Decrease in the viscosity of liquids and increase in that of gases
Work done by a/an __________ process is determined by ∫p. dv
Adiabatic
Quasi-static
Isothermal
Isentropic
While the bin cards are used in the effective stores management, the queuing theory is associated with the __________ time.
Waiting
Idle
Inspection
Tool replacement
The most important consideration in value engineering is the
Profit maximisation
Customer satisfaction
Cost reduction
Process improvement
Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same
Period increases
Period decreases
Group increases
Both 'b' & 'c'
LVDT used for displacement measurement is a/an __________ transducer.
Passive
Active
Capacitive
None of these
Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.
Decreases
Increases
Remain same
May increase or decrease
The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.
Two
Four
Six
Eight
A high pressure boiler generates steam at a pressure greater than __________ kg/cm2.
10
30
50
80
Pick out the wrong statement
Processing of thermosetting plastics is ideally done by injection moulding
Processing of thermoplastics is ideally done by compression moulding
Mass production of seamless pipes are done by electrical resistance welding (ERW)
Stretch forming is a process of cold drawing
Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30%?
9,100
13,000
7,000
2,550
Which of the following pairs is not correctly matched?
Uranium - 233 : Fertile material
Binding energy : Mass defect
Scattering: Absorption cross-section
Number of nucleons : Mass number
Work study deals with the __________ study.
Time
Motion
Both (A) & (B)
Neither (A) nor (B)
Basic open hearth furnace (BOF) is not used for producing __________ steel.
Killed
Rimming
High alloy
None of these
__________ is the most important element, which controls the physical properties of steel.
Manganese
Silicon
Carbon
Vanadium
Which of the following has the least value of ultimate tensile strength (UTS)?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron
Nusselt number/Biot number varies
Inversely with thermal conductivity
Directly with heat transfer co-efficient
Directly with thermal conductivity
Inversely with the dimension of the solid
A reduction in thermal resistance during heat transfer does not occur in the
Convection heat transfer by stirring the fluid and cleaning the heating surface
Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
Radiation heat transfer by increasing the temperature and reducing the emissivity
None of these
Electrostatic separation of minerals from each other is based on their differences in the following property.
Densities
Magnetic permeabilities
Electrical conductivities
Hardness
For an ideal gas, Cp - Cv is
R
-R
0
(3/2) R
Spherical shape of mercury droplets is due to its
High viscosity
Low surface tension
High density
High surface tension
Hydrogen can be
Used in I.C. engines as fuel
Liquefied & stored under cryogenic conditions
Produced by electrolysis of water
All (A), (B) & (C)
Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.
0.01 to 0.10
0.2 to 0.4
0.5 to 0.7
0.8 to 1.0
Pressure exerted by a liquid depends upon its
Surface tension
Density
Viscosity
Buoyancy
Use of water as a manometric liquid suffers from the disadvantage of its
Low vapour pressure
Corrosive nature
High vapour pressure
High boiling point
Exposure to __________ accelerates the degradation of plastics.
Ultraviolet radiation
High atmospheric temperature
High ambient temperature
Damp atmosphere
Most important property of steels for use in automobile bodies is the
Formability
Yield strength
Toughness
Resilience
The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2.
273.15
225.65
100.03
373.15