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?
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?
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.
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
Which of the following has the highest value of thermal conductivity?
Which of the following has the highest value of thermal conductivity?
For intermittent work which of the following furnaces is suitable?
For intermittent work which of the following furnaces is suitable?
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
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?
Ajax Wyatt furnace is started when
Ajax Wyatt furnace is started when
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
Which of the following heating methods has maximum power factor?
Which of the following heating methods has maximum power factor?
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 the transmission of heat from one body to another
For the transmission of heat from one body to another
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?
A non-dimensional number generally associated with natural convection heat transfer is
A non-dimensional number generally associated with natural convection heat transfer is
Direct arc furnaces have which of the following power factors?
Direct arc furnaces have which of the following power factors?
The electrode of a direct arc furnace is made of
The electrode of a direct arc furnace is made of
In a resistance furnace the atmosphere is
In a resistance furnace the atmosphere is
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
In an electric room heat convector the method of heating used is
In an electric room heat convector the method of heating used is
________ has the highest value of thermal conductivity.
________ has the highest value of thermal conductivity.
________ is used for heating non-conducting materials.
________ is used for heating non-conducting materials.
Induction furnaces are employed for which of the following?
Induction furnaces are employed for which of the following?
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?
Heat transfer by condition will not occur when
Heat transfer by condition will not occur when
Which of the following insulating materials was suitable for low temperature applications?
Which of the following insulating materials was suitable for low temperature applications?
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
Induction heating process is based on which of the following principles?
Induction heating process is based on which of the following principles?
In arc furnace the function of choke is
In arc furnace the function of choke is
In a domestic cake baking oven the temperature is controlled by
In a domestic cake baking oven the temperature is controlled by
Heat is transferred simultaneously by condition, convection and radiation
Heat is transferred simultaneously by condition, convection and radiation
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 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?
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
Hysteresis loss and eddy current loss are used in
Hysteresis loss and eddy current loss are used in
In the indirect resistance heating method, maximum heat-transfer takes place by
In the indirect resistance heating method, maximum heat-transfer takes place by
Induction heating takes place in which of the following?
Induction heating takes place in which of the following?
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 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?
Which of the following is an advantage of eddy current heating?
Which of the following is an advantage of eddy current heating?
Method has leading power factor
Method has leading power factor
Which of the following is an advantage of heating by electricity?
Which of the following is an advantage of heating by electricity?
Radiant heating is used for which of the following?
Radiant heating is used for which of the following?
For radiant heating around 2250°C, the heating elements are made of
For radiant heating around 2250°C, the heating elements are made of
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?
A perfect black body is one that
A perfect black body is one that
In an electric press mica is used
In an electric press mica is used
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?
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?
Radiations from a black body are proportional to
Radiations from a black body are proportional to
Induction heating takes place it which of the following?
Induction heating takes place it which of the following?
In induction heating __________ is abnormally high.
In induction heating __________ is abnormally high.
For heating element high resistivity material is chosen to
For heating element high resistivity material is chosen to
