The octane rating of petrol commercially available is usually
A.85 – 90
B.90 – 100
C.100 – 105
D.110 – 125
E.125 – 140
Category: Mechanical Engineering Mcqs
The boundary condition for steady flow of an ideal fluid is that the
A.Velocity is zero at the boundary
B.Velocity component normal to the boundary is zero
C.Velocity component tangent to the boundary is zero
D.Boundary surface must be stationary
E.Continuity equation must be satisfied
Chips with built up edge are produced while machining
A.Ductile material
B.Brittle material
C.Cast materials
D.Hard materials
E.Non-ferrous materials
The dielectric strength of rubber is about
A.3 kV/mm
B.30 kV/m
C.30 kV/cm
D.None of the above
Which of the following refrigerant is the cheapest?
A.Ammonia
B.Freon 12
C.Freon 22
D.Methyl chloride
E.Air
Inflation pressure for truck tyres is generally
A.1 kg/cm2
B.2.2 kg/cm2
C.3 kg/cm2
D.6 kg/cm2
Nickel is
A.Ferromagnetic
B.Ferroelectric
C.Dielectric
D.Paramagnetic
E.None of the above
A fall in demand for the product of a monopolised industry when predicted with lead to
A.A fall in price
B.A decrease in number of firms in the long run
C.A decrease in the output of each firms
D.All of the above
E.None of the above
The assumptions made in the most familiar form of Bernoulli’s equation is that
A.Flow is along the streamlines
B.Flow is steady
C.Fluid is non-viscous
D.Fluid is homogeneous
E.All the above
In automatic control systems a good control is
A.One that is automatically controlled
B.One that gives maximum production
C.One that gives high operating efficiency
D.One that gives good results
E.One that has minimum deviation following a disturbance
