For grey cast iron the pouring temperature is
A.1510 to 1532?C
B.1455 to 1495?C
C.1400 to 1465?C
D.1250 to 1290?C
Category: Mechanical Engineering Mcqs
In case of oil fired boiler, the excess air is usually
A.1 to 2 percent
B.5 to 12 percent
C.20 to 25 percent
D.75 to 125 percent
In case of thin walled cylinders the ratio of hoop stress to radial stress is
A.2
C.4
E.None of the above
Which of the following is the softest material?
A.Corundum
B.Diamond
C.Calcite
D.Quartz
E.Fluorite
The purpose of an automatic process control system generally is
A.To automatically produce goods
B.To automatically detect inferior quality goods
C.To automatically process the raw materials
D.To direct the forces that give stable plant and process operation by maintaining desired values of process variables or conditions
E.None of the above
A piezoelectric crystal can be used to measure
A.Temperature
B.Velocity
C.Acceleration
D.Flow
E.All of the above
In spark ignition engines, the knocking tendency is reduced by
A.Reduction of compression ratio
B.Advancing ignition timing
C.Increasing exhaust temperature
D.Adding dope like tetra ethy lead to the fuel
E.All of the above
A carburettor is used to supply
A.Diesel + air + lubricating oil
B.Petrol + air + lubricating oil
C.Petrol + lubricating oil
D.Air + lubricating oil
E.Petrol + air
The turbulence in diesel engine ensures to
A.Increase the volumetric efficiency
B.Increase the compression pressure
C.Bring the fuel quickly in contact with air
D.Increase the fuel consumption
E.Reduce the engine vibrations
To avoid chances of maisalignment the bearing generally used is
A.Radial bearing
B.Axial bearing
C.Taper roller bearing
D.Self-aligning bearing
E.Double row ball bearing
