A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
A. average voltage
B. r.m.s. voltage
C. peak voltage
D. none of the above
A. average voltage
B. r.m.s. voltage
C. peak voltage
D. none of the above
A. A coil with large resistance
B. A coil with low resistance
C. A coil with large distributed capacitance
D. A coil with low distributed capacitance
A. R/Z
B. cosine of phase angle difference be-tween current and voltage
C. kW/kVA
D. ratio of useful current to total cur¬rent Iw/I
E. all of these
A. zero
B. 0.08 lagging
C. 0.8 leading
D. unity
A. low efficiency
B. high power factor
C. unity power factor
D. maximum load current
A. create more electrical noise
B. are likely to melt under excessive eddy current heat
C. consume more power
D. exhibit unwanted inductive and capacitive effects
A. the same as frequency
B. time required to complete one cycle
C. expressed in amperes
D. none of the above