The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
Ambient
Dry bulb
Dew point
Wet bulb
Correct Answer :
C. Dew point
Related Questions
Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
Film
Nucleate
Transition
All modes of
Dry saturated steam can be converted into superheated steam by
Increasing its cross-sectional area of flow
Passing it through a pressure reducing valve
Forcing it downwards through a vertical tube
None of these
The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
Hard
Soft
Silicon carbide
Aluminium oxide
Atomic __________ is a whole number for an element.
Number
Weight
Radius
None of these
Non-ferrous alloys used for making cutting tools need not have high
Abrasion resistance
Toughness
Red hardness
Cutting speed
Colour comparator is used to measure the
pH value
Electrode potential
Colour intensity
None of these
As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
110
85
60
45
Gantt charts are used for streamlining the
Inventory control
Production schedule
Sales forecasting
Quality control
The refractory lining of the bottom in a basic electric arc furnace is made of
Silica
Alumina
Magnesia
Fireclay
The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is
More
Less
Same
More but less than the diameter of bolt
Out of the following the refractive index is the highest for
Glass
Diamond
Brine
Kerosene
Reduction in the grain size reduces the __________ of the material.
Fatigue resistance
Tensile strength
Creep resistance
All (A), (B) & (C)
Temperature attained in soldering of metals is about __________ °C.
150-300
400-500
650-800
1000-1100
Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
Mach
Froude
Reynolds
Euler
Which of the following is not an ore of copper?
Cryolite
Azurite
Chalcopyrite
Malachite
Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight
1.5
3
5
7
Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process?
Galvanising
Tinning
Sherardizing
None of these
The activity of pure hydrogen gas at 1000°C and 5 atm pressure
Is always less than 1
Is always greater than 1
Can be 5
Depends on the choice of the standard state
Super conduction in metals is observed at a temperature of __________ °K.
<100
>100
About 273
About 373
Carnot cycle is also termed as the constant __________ cycle in thermodynamics.
Entropy
Pressure
Volume
Heat
Which of the following is not the function of a volute casing provided in a centrifugal pump?
To reduce the head loss in discharge
To increase the pump efficiency
To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity
To increase the pump discharge rate
Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
Volume
Pressure
Heat
None of these
Pressure exerted by a liquid depends upon its
Surface tension
Density
Viscosity
Buoyancy
Case hardening of a material is
Followed by tempering or carburising
Preceded by its tempering
Done to get a soft ductile interior with a very hard surface
Carried out to get extreme hardness in its core
A material subjected __________ must have high resilience.
Shock loading
Vibration
Fatigue
Tension
Dielectric
Is an electrical insulating material
Of low resistivity is preferred
Should have high thermal conductivity
Need not defy the corrosive action of chemicals
Powder metallurgy process does not make metal powder by
Atomisation
Grinding/milling
Hammering
Electrolytic deposition
Pick out the wrong statement.
Copper is the metal having the highest electronic conductivity
Hardenability & Weldability of metals are inversely related
Covalent bonding formed by sharing of electrons is present in all semi-conductor materials
Glass transition temperature applies to 'polymers' but not to 'glasses'
__________ is not used as a material of construction in thermocouples.
Alumel
Rhodium
Constantan
Duralumin
The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
5
15
30
45