Radiations from a black body are proportional to
Radiations from a black body are proportional to
Which of the following is an advantage of eddy current heating?
Which of the following is an advantage of eddy current heating?
Heat transfer by condition will not occur when
Heat transfer by condition will not occur when
Induction furnaces are employed for which of the following?
Induction furnaces are employed for which of the following?
In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.
In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.
In heating the ferromagnetic material by induction heating, heat is produced due to
In heating the ferromagnetic material by induction heating, heat is produced due to
In the indirect resistance heating method, maximum heat-transfer takes place by
In the indirect resistance heating method, maximum heat-transfer takes place by
In a resistance furnace the atmosphere is
In a resistance furnace the atmosphere is
A non-dimensional number generally associated with natural convection heat transfer is
A non-dimensional number generally associated with natural convection heat transfer is
Due to which of the following reasons it is desirable to have short arc length?
Due to which of the following reasons it is desirable to have short arc length?
Ajax Wyatt furnace is started when
Ajax Wyatt furnace is started when
Direct arc furnaces have which of the following power factors?
Direct arc furnaces have which of the following power factors?
________ has the highest value of thermal conductivity.
________ has the highest value of thermal conductivity.
The material of the heating element for a furnace should have
The material of the heating element for a furnace should have
Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons?
Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons?
In an electric room heat convector the method of heating used is Resistance heating
In an electric room heat convector the method of heating used is Resistance heating
The temperature inside a furnace is usually measured by which of the following?
The temperature inside a furnace is usually measured by which of the following?
By which of the following methods the temperature inside arcane can be varied?
By which of the following methods the temperature inside arcane can be varied?
In induction heating __________ is abnormally high.
In induction heating __________ is abnormally high.
When a body reflects entire radiation incident on it, then it is known as
When a body reflects entire radiation incident on it, then it is known as
Which of the following methods of heating is not dependent on the frequency of supply?
Which of the following methods of heating is not dependent on the frequency of supply?
Hysteresis loss and eddy current loss are used in
Hysteresis loss and eddy current loss are used in
In resistance heating highest working temperature is obtained from heating elements made of
In resistance heating highest working temperature is obtained from heating elements made of
A perfect black body is one that
A perfect black body is one that
In an electric room heat convector the method of heating used is
In an electric room heat convector the method of heating used is
Induction heating takes place it which of the following?
Induction heating takes place it which of the following?
Which of the following methods is used to control temperature in resistance furnaces?
Which of the following methods is used to control temperature in resistance furnaces?
In direct arc furnace, which of the following has high value?
In direct arc furnace, which of the following has high value?
Which of the following will happen if the thickness of refractory wall of furnace is increased?
Which of the following will happen if the thickness of refractory wall of furnace is increased?
Radiant heating is used for which of the following?
Radiant heating is used for which of the following?
In an electric press mica is used
In an electric press mica is used
________ is used for heating non-conducting materials.
________ is used for heating non-conducting materials.
Which of the following is an advantage of heating by electricity?
Which of the following is an advantage of heating by electricity?
The electrode of a direct arc furnace is made of
The electrode of a direct arc furnace is made of
Which of the following has the highest value of thermal conductivity?
Which of the following has the highest value of thermal conductivity?
The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth?s atmosphere is known as
The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth?s atmosphere is known as
Heat is transferred simultaneously by condition, convection and radiation
Heat is transferred simultaneously by condition, convection and radiation
Method has leading power factor
Method has leading power factor
In a domestic cake baking oven the temperature is controlled by
In a domestic cake baking oven the temperature is controlled by
Induction heating takes place in which of the following?
Induction heating takes place in which of the following?
In arc furnace the function of choke is
In arc furnace the function of choke is
Properly of low temperature coefficient of heating element is desired due to which of the following reasons?
Properly of low temperature coefficient of heating element is desired due to which of the following reasons?
It is desirable to operate the arc furnaces at power factor of
It is desirable to operate the arc furnaces at power factor of
For intermittent work which of the following furnaces is suitable?
For intermittent work which of the following furnaces is suitable?
Which of the following heating methods has maximum power factor?
Which of the following heating methods has maximum power factor?
For heating element high resistivity material is chosen to
For heating element high resistivity material is chosen to
For the transmission of heat from one body to another
For the transmission of heat from one body to another
For radiant heating around 2250°C, the heating elements are made of
For radiant heating around 2250°C, the heating elements are made of
By the use of which of the following, high frequency power supply for induction furnaces can be obtained?
By the use of which of the following, high frequency power supply for induction furnaces can be obtained?
Which of the following insulating materials was suitable for low temperature applications?
Which of the following insulating materials was suitable for low temperature applications?
Resistance variation method of temperature control is done by connecting resistance elements in
Resistance variation method of temperature control is done by connecting resistance elements in
Induction heating process is based on which of the following principles?
Induction heating process is based on which of the following principles?
Which of the following devices is necessarily required for automatic temperature control in a furnace?
Which of the following devices is necessarily required for automatic temperature control in a furnace?
