Power Electronics MCQ Multiple Choice Questions - Page 9 for Practice

Power Electronics MCQ Questions for Practice

121. The triac is …………….

122. The UJT may be used as ……………….

123. The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ………………. in its first quadrant

124. To turn on UJT, the forward bias on the emitter diode should be …………… the peak point voltage

125. TRIAC is a semiconductor power electronic device which contains

126. Under harmonic free load voltages, the 3 phase VSI

127. Unipolar modulation is generally used in

128. Very large values of modulation index (greater than 3.24 lead to)

129. Voltage commutation circuit can be converted into a current commutation by interchanging the positions of

130. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal …………….

131. When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ………………..

132. When the temperature increases, the inter-base resistance (RBB) of a UJT ………….

133. When the temperature increases, the intrinsic stand off ratio ……….

134. Which of the following is not a characteristic of UJT?

135. With increase in firing angle

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