Which of the following hydrocarbons are the most desirable in gasoline?
A.Paraffins
B.Isoparaffins
C.Naphthenes
D.Aromatics
Category: Engineeeing Mcqs
Which of the following hydrocarbons are the most desirable in high speed diesel oil?
A.Aromatics
B.Naphthenes
C.Paraffins
D.Naphthenic acids
Which of the following statement is correct?
A.When average cost is decreasing, it is more than marginal cost
B.When average cost is decreasing, it is less than marginal cost
C.When average cost is increasing, it is more than marginal cost
D.None of the above
Which of the following cast iron is resistant to attack by sea water?
A.Low chromium cast iron
B.Low nickel cast iron
C.Low sulphur cost iron
D.Low phosphorous cast iron
Coking is
A.Formation of lumps or masses of coke in boiler furnaces at high temperatures
B.Heating of coal in absence of air driving carbon and leaving behind the residue of carbon
C.Burning of coal in a furnace
D.Producing lumps of coal from fine powders with the help of a binder
E.None of the above
Tangential acceleration direction is
A.Along the angular velocity
B.Perpendicular to the angular velocity
C.Opposite to the angular velocity
D.Any of (A) and (B)
E.Any of (A) and (C)
The greatest amount of strain energy per unit volume that a material can absorb sithout exceeding its elastic limit is
A.Elastic limit
B.Toughness
C.Resilience
D.Proof resilience
E.Endurance limit
The power loss in an overhead transmission line is mainly due to
A.Line resistance
B.Line inductance
C.Heat loss
D.Magnetic loss
E.All of the above
A turbine model test with 260 mm diameter showed an efficiency of 90 percent. The efficiency that can be expected from a 1.2 m diameter impeller is
A.90 percent
B.81 percent
C.91 percent
D.93.18 percent
E.None of the above
