In the indirect resistance heating method, maximum heat-transfer takes place by____________?

Related Mcqs:

1. In resistance heating highest working temperature is obtained from heating elements made of_____________?

   A. nickel copper
   B. nichrome
   C. silicon carbide
   D. silver

2. 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 takingplace in the charge
   D. none of the above factors

3. In an electric room heat convector the method of heating used is______________?

   A. arc heating
   B. resistance heating
   C. induction heating
   D. dielectric heating

4. For radiant heating around 2250°C, the heating elements are made of____________?

   A. copper alloy
   B. carbon
   C. tungsten alloy
   D. stainless steel alloy

5. Resistance variation method of temperature control is done by connecting resistance elements in_____________?

   A. series
   B. parallel
   C. series-parallel connections
   D. star-delta connections
   E. all of the above ways

6. Induction heating takes place it which of the following ?

   A. Insulating materials
   B. Conducting materials which are magnetic
   C. Conducting materials which are non-magnetic
   D. Conducting materials which may or may not be magnetic

7. Which of the following heating methods has maximum power factor ?

   A. Arc heating
   B. Dielectric heating
   C. Induction heating
   D. Resistance heating

8. Heat transfer by condition will not occur when____________?

   A. bodies are kept in vacuum
   B. bodies are immersed in water
   C. bodies are exposed to thermal radiations
   D. temperatures of the two bodies are identical

9. The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as_______________?

   A. ablation
   B. radiation
   C. viscous dissipation
   D. irradiation

10. A non-dimensional number generally associated with natural convection heat transfer is____________?

    A. Prandtl number
    B. Grashoff number
    C. Pecelet number
    D. Nusselt number