Which of the following insulating materials was suitable for low temperature applications ?

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

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

A. zero
B. 0.707 lagging
C. unity
D. 0.707 leading

A. radiation
B. convection
C. conduction
D. any of the above

A. voltage variation
B. thermostat
C. auto-transformer
D. series-parallel operation

A. T1
B. T2
C. T3
D. T*