In induction heating ___________ is abnormally high?
In induction heating ___________ is abnormally high?
A. phase angle
B. frequency
C. current
D. voltage
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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_____________?A. series
B. parallel
C. series-parallel connections
D. star-delta connections
E. all of the above waysis used for heating non-conducting materials?
is used for heating non-conducting materials?A. Eddy current heating
B. Arc heating
C. Induction heating
D. Dielectric heatingWhich of the following insulating materials was suitable for low temperature applications ?
Which of the following insulating materials was suitable for low temperature applications ?A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. CorkBy which of the following methods the temperature inside arc nace can be varied ?
By which of the following methods the temperature inside arc nace can be varied ?A. By disconnecting some of the heating elements
B. By varying the operating voltage
C. By varying the current through heating elements
D. By any of the above methodA non-dimensional number generally associated with natural convection heat transfer is____________?
A non-dimensional number generally associated with natural convection heat transfer is____________?A. Prandtl number
B. Grashoff number
C. Pecelet number
D. Nusselt numberWhich of the following is an advantage of eddy current heating ?
Which of the following is an advantage of eddy current heating ?A. The amount of heat generated can be controlled accurately
B. Heat at very high rate can be gene-rated
C. The area of the surface over which heat is produced can be accurately controlled
D. All of the above