For the same temperature limits and heat input, the most efficient cycle is
A.Carnot
B.Otto
C.Diesel
D.Brayton
E.All of the above have same efficiency
Author: BILAL KHATTAK
Plastic collosion of two bodies of equal mass results in a common velocity after impact which is
A.Sum of their initial velocities
B.Difference of their initial velocities
C.Average of their initial velocities
D.Independent of their initial velocities
E.None of the above
Blisters in wrought iron cause
A.Brittleness at high temperatures
B.Brittleness at low temperatures
C.Loose textured metal
D.Voids created due to chemical reaction between carbon and iron oxide
E.None of the above
_______ has oxides of iron, magnesium and silicon.
A.P waves
B.Lower mental
C.L waves
D.None of these
For annealing of aluminium it is heated to
A.325?C
B.425?C
C.525?C
D.625?C
If molar Cp = 4.97 then
A.Cv = 2.97
B.Cv = 1.97
C.Cv = 5.97
D.Cv = 0.97
E.Cv = 0.597
Thermal neutrons are those which
A.are at very high temperature
B.move with high velocity
C.are at rest
D.have kinetic energies similar to those of surrounding molecules
Which of the following motor can operate on lagging as well as leading power factor?
A.Universal motor
B.Squirrel cage induction motor
C.Synchronous motor
D.Reluctance motor
E.Capacitor run motor
Overall efficiency of a gas turbine is
A.equal to Rankine cycle efficiency
B.equal to Carnot cycle efficiency
C.less than Diesel cycle efficiency
D.more than Otto or Diesel cycle efficiency
A kinematic chain requires minimum of
A.2 links and 3 turning pairs
B.3 links and 3 turning pairs
C.3 links and 4 turning pairs
D.4 links and 4 turning pairs
E.4 links and 5 turning pairs
