Q.1.
By the use of which of the following, high frequency power supply for induction furnaces can be obtained?
Q.2.
Which of the following methods is used to control temperature in resistance furnaces?
Q.3.
It is desirable to operate the arc furnaces at power factor of
Q.4.
A perfect black body is one that
Q.5.
For heating element high resistivity material is chosen to
Q.6.
The temperature inside a furnace is usually measured by which of the following?
Q.7.
In an electric room heat convector the method of heating used is Resistance heating
Q.8.
Which of the following heating methods has maximum power factor?
Q.9.
What is the code word to notify workers that the machine is about to be on
Q.10.
Which of the following is not an important factor when heat treating
Q.11.
Which of the following is NOT true about a steel that is quenched and tempered
Q.12.
Which result from an oxyacetylene torch test indicates that a metal is not suitable for welding
Q.13.
Which of the following statements is NOT true of nonferrous metals
Q.14.
In direct arc furnace, which of the following has high value?
Q.15.
For intermittent work which of the following furnaces is suitable?
Q.16.
Due to which of the following reasons it is desirable to have short arc length?
Q.17.
In a domestic cake baking oven the temperature is controlled by
Q.18.
Which of the following is an advantage of heating by electricity?
Q.19.
In heating the ferromagnetic material by induction heating, heat is produced due to
Q.20.
Resistance variation method of temperature control is done by connecting resistance elements in