A reaction follows the rate expression rate = k CA If the rate is expressed in terms of mole/(1 sec) and the concentration of A (CA) is in mole/lit, the units of the first-order rate constant (k) are
A.1/(mol. Sec)
B.1/sec
C.mol/(1 sec)
D.sec.
Category: Engineeeing Mcqs
In a four stroke engine, each cylinder has
A.One valve
B.Two valves
C.Three valves
D.Four valves
E.Number of valves depends upon the engine design
The most efficient shape of a series is that which
A.given a minimum heat loss
B.keeps the metal in molten state for longer period
C.both (A) and (B) above
A mouthpiece cannot be used under very large head because
A.The variation in discharge is large
B.The flow through mouthpiece is erratic
C.Vortex is created at the vena contracta
D.Cavitation occurs at the vena contracta
E.Of practical difficulties in contraction
The number of revolutions per km for a free rolling tyre are less than that calculated from its static radius. This difference in number of revolutions is due to
A.forces in the contact area that cause slight forward of the tread
B.hysteresis of the tyre materials which make the dynamic loaded radius somewhat larger than the static radius
C.either of (A) and (B) above
D.none of the above
A four wheel drive has
A.no differential
B.differential on rear side only
C.differential on front side only
D.both front as well as rer differentials
Intensive properties are the properties whose magnitude
A.depends on the quantity of material involved
B.does not depend on the quantity of material involved
C.depends on the path followed
D.none of the above
When the temperature of an idealgas is increased from 27?C to 927?C the kinetic energy will be
A.same
B.twice
C.eight times
D.four times
Tempering is generally done to reduce all of the following EXCEPT:
A.Brittleness
B.Ductility
C.Hardness
D.Tensile strength
