The amount of dielectric heating is inversely proportional to frequency. True Fa

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Question
The amount of dielectric heating is inversely proportional to frequency.
Options
A. True
B. False

Correct Answer

False

Explanation

It is proportional to frequency.

Power Electronics problems

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1. If duty cycle is a and the load is a resistance R, the rms value of output voltage is
Options
A. aV
B. a V
C. a²V
D.

3. In single phase half wave regulator, the average current over one full cycle
Options
A. is always positive
B. may be positive or negative
C. may be negative
D. is always negative

4. Two thyristor of same rating and same specifications
Options
A. will have equal turn on and turn off periods
B. will have equal turn on but unequal turn off periods
C. may have equal or unequal turn on and turn off periods
D. will have unequal turn on and turn off periods

5. A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45�, the speed is likely to be
Options
A. about 350 rpm
B. about 250 rpm
C. about 175 rpm
D. about 125 rpm

6. An 8 bit DAC has a full scale output of 2 mA and full scale error of � 0.5%. If input is 10000000 the range of outputs is
Options
A. 994 to 1014 ?A
B. 990 to 1020 ?A
C. 800 to 1200 ?A
D. none of the above

8. For the K map in the given figure the simplified Boolean expression is
Options
A. A C + A D + ABC
B. A C + A D + ABC
C. A C + A D + ACD
D. A C + A D + AB C

10. For the truth table of the given figure Y =
Options
A. A + B + C
B. A + BC
C. A
D. B

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