__________ can replace tungsten in high speed steel.
Chromium
Vanadium
Cobalt
Molybdenum
Correct Answer :
C. Cobalt
Related Questions
Hydro-cyclone is a
Crusher
wet classifier
Dry classifier
Magnetic separator
Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
0.8
7.8
200
10000
In Imperial Smelting Process for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following:
Jet of water at high pressure
Blast of air
Mixture of water and air
Rain of molten lead
The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
Ability to absorb shock
Capacity to store energy
Ratio of the wire & coil diameters
Load to produce unit deflection
For the Stoke's law to be valid in the case of a falling sphere in a fluid, the
Reynolds number (based on sphere diameter) should be < 1
Flow around the sphere should be in turbulent region
Sphere must be metallic
Fluid density should be constant
Constituents of stellite are
Zinc, copper & nickel
Cobalt, chromium & tungsten
Zinc, aluminium & nickel
Nickel, cobalt & vanadium
Gas turbine normally employs a constant __________ cycle.
Pressure
Temperature
Volume
None of these
Powder metallurgy is used to produce
High precision components with complex cavities and sharp features
Components of large size
Porosity free components
Components of such alloys whose constituents do not form alloys readily
The dew point of moist air becomes __________ with decrease in its relative humidity.
Less than the wet bulb temperature
More than the wet bulb temperature
More than the dry bulb temperature
Equal to wet bulb temperature
Pick out the correct statement
Jet engine can work, where there is no atmosphere
Rocket engines cannot work, where there is no atmosphere
Rocket engines carry oxygen required for the combustion in the form of oxidiser
Jet engines also carry oxidiser
__________ rubber is generally used for making 'O' rings used for vacuum sealings.
Natural
Neoprene
Butadiene
Nitrile
Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
Only
Plus variable cost
Plus overhead cost
Plus selling expenses
Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
X-rays
γ-rays
α-rays
β-rays
Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to
(r2 - r1)/r1. r2
r1. r2/(r2 - r1)
(r2 + r1)/r1. r2
r1. r2/(r2 + r1)
Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
746
3000
1000
550
Materials having resistivity ranging from 1 to 100 ohm. cm is termed as
Conductor
Insulator
Semi-conductor
None of these
Steel is welded using the __________ flame.
Carburising
Neutral
Oxidising
All (A), (B) & (C)
The order of a chemical reaction
Can be determined only experimentally
Can be determined from the stoichiometry of the reaction
Cannot be zero
Can be fractional
A compact estimate about the amount of materials handling between various work stations is obtained from the
Gantt chart
Bin chart
String diagram
Travel chart
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
Cupola produces __________ iron.
Pig
Cast
Wrought
Carbon free
Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
A
l
A2
Both 'a' & 'b'
Minimum thermal efficiency of a steam boiler may be around __________ percent
25
45
65
20
The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
A
D
1/A
1/A2
Which of the following is a commonly used manometric liquid for low pressure range?
Ethyl alcohol
Carbon tetrachloride
Glycerol
Ethylene glycol
The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by
T1/(T1-T2)
T2/(T1-T2)
T1/T2
T2/T1
__________ test can be termed as the semidestructive test.
Impact
Torsion
Hardness
Charpy
For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.
250
500
1000
3000
Pick out the wrong conversion of absolute & kinematic viscosities.
1 stoke = 1 cm2/sec
1 N.sec/m2 = 10 paise
1 stoke = 1 m2/sec
1 m2/sec = 104 stokes
Air-petrol ratio in an automotive petrol engine is around
14 : 1
22 : 1
25 : 1
4 : 1