The machinability of aluminium increases when __________ is added to aluminium.

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Question
The machinability of aluminium increases when __________ is added to aluminium.
Options
A. copper
B. magnesium
C. silicon
D. lead and bismuth

Correct Answer

lead and bismuth

More questions

2. The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called
Options
A. compressive stress
B. shear stress
C. bending stress
D. elastic modulus

3. According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)
Options
A. Cd(L - nH)2gH
B. Cd(L - 0.1nH)2gH^3/2
C. Cd(L - nH)2gH²
D. Cd(L - 0.2nH)2gH^5/2

4. The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
Options
A. mechanical efficiency
B. overall efficiency
C. indicated thermal efficiency
D. volumetric efficiency

5. The function of positive crankcase ventilation (PCV) system is that it
Options
A. mixes fuel with air
B. promotes combustion by creating a swirling movement in the air-fuel mixture
C. returns blow-by gases from the crankcase to the intake system
D. feeds blow-by gases to the exhaust manifold

7. A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be
Options
A. k₁ k₂
B. k₁ + k₂
C.
D.

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