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7. The ripple voltage in the d.c. output is small if a) frequency of supply is high b) the filtering capacitor is small c) the load current is large d) none of the above is true

7. The ripple voltage in the d.c. output is small if a) frequency of supply is high b) the filtering capacitor is small c) the load current is large d) none of the above is true

Electric Motor Control
Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter3: Magnetic Starters
Section: Chapter Questions
Problem 30SQ
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7. The ripple voltage in the d.c. output is small if a) frequency of supply is high b) the filtering capacitor is small c) the load current is large d) none of the above is true 8. A Van de Graaff generator has a belt speed of 3 m/s, charge density of 12 µc/m2 an a belt width 2 m. The maximum charging current is: a) 45 µA b) 50 µA c) 72 μΑ d) 81 μΑ 9. For a 3 stage Cascaded transformer if P1, P2, P3 are the loadings of I, II and III stages primaries, then a) P1 > P2 > P3 b) P1 = P2 = P3 c) P2 < P1 < P3 d) P1 < P2 < P3 10. Parallel resonant transformer test system is used when a) large test voltages are needed b) when high frequency test voltage is needed c) stable output voltage with high rate of rise of voltage is needed d) large current is needed
Transcribed Image Text:7. The ripple voltage in the d.c. output is small if a) frequency of supply is high b) the filtering capacitor is small c) the load current is large d) none of the above is true 8. A Van de Graaff generator has a belt speed of 3 m/s, charge density of 12 µc/m2 an a belt width 2 m. The maximum charging current is: a) 45 µA b) 50 µA c) 72 μΑ d) 81 μΑ 9. For a 3 stage Cascaded transformer if P1, P2, P3 are the loadings of I, II and III stages primaries, then a) P1 > P2 > P3 b) P1 = P2 = P3 c) P2 < P1 < P3 d) P1 < P2 < P3 10. Parallel resonant transformer test system is used when a) large test voltages are needed b) when high frequency test voltage is needed c) stable output voltage with high rate of rise of voltage is needed d) large current is needed
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