Related Questions

In an electric room heat convector the method of heating used is Resistance heating
A True
B False
An alloy used in making heating elements for electric heating device is
A Solder
B Alloy Steel
C Nichrome
D German Silver
Heating wet steam at constant temperature is heating it at constant
A Volume
B Pressure
C Entropy
D Enthalpy
In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating
A Decreases with increase in Rankine cycle efficiency
B Increases with increase in Rankine cycle efficiency
C Is unaffected by increase in Rankine cycle efficiency
D None of the above
In resistance heating highest working temperature is obtained from heating elements made of
A Nickel copper
B Nichrome
C Silicon carbide
D Silver
In heating the ferromagnetic material by induction heating, heat is produced due to
A Induced current flow through the charge
B Hysteresis loss taking place below Curie temperature
C Due to hysteresis loss as well as eddy current loss taking place in the charge
D None of the above factors
Gross heating value of coal is __________ the net heating value.
A Higher than
B Lower than
C Same as
D None of these
Heating of ferromagnetic materials to a temperature above Curie temperature makes it
A Insulator for heat & electricity transmission
B Ferritic
C Behave like paramagnetic materials
D Superconductor
Thermoplastic materials are those materials which
A Do not become hard with the application of heat and pressure and no chemical change occurs
B Are flexible and can withstand considerable wear under suitable conditions
C Are formed into shape under heat and pressure and results in a permanently hard product
D Are used as a friction lining for clutches and brakes
In drilling softer materials, the cutting speed is ___________ as compared to harder materials.
A Same
B Low
C High
D None of these

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