Failure of an engine to start even though it turns over at normal cranking speed could be due to
A.Run down battery
B.Sticking valve
C.Defective ignition
D.A defective cranking motor
E.Low ambient temperature
Category: Mechanical Engineering Mcqs
For water, boiling and melting point will concide at
A.0? K
B.100? K
C.200? K
D.2730.16? K
E.216.73? K
The characteristic equation of gases pv = nRT holds good for
A.Monoatomic gases
B.Diatomic gases
C.Real gases
D.Ideal gases
E.Mixture of gases
If a sample of steel shows unsymmetrical deformation of a piece in quenching, the probable cause could be
A.Excessive proportion of alloying elements
B.Non-uniform heating or cooling
C.Impure quenching oil
D.Low temperature during heating
E.Low specific heat of quenching oil
Ferromagnetic alpha iron change to paramagnetic alpha iron at
A.1650?C
B.1500?C
C.1400?C
D.910?C
E.77?C
During heat treatment the formation of thick layer of scale on the surface of steel articles is mainly due to
A.excessive hardness
B.oxidation
C.reduction
D.coarse grain structure
In a vapour compression cycle the lowest temperature occurs in
A.Compressor
B.Expansion valve
C.Condenser
D.Receiver
E.Evaporator
When steam expands without doing mechanical work, its enthalpy
A.Increases
B.Decreases
C.Does not change
D.Depends on the factors
E.None of the above
Which of the following device can be used to give an indication for temperature changes?
A.Bourden gauge
B.Thermistor
C.Thermocouple
D.Transistor
E.LED
