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In a 3-phase voltage source inverter used for speed control of induction motor anti parallel diodes are used across each switching device as shown in figure. The main purpose of diodes is to
The I – V characteristics of the zener diodes D1 and D2 are shown in Figure I. These diodes are used in the circuit given in Figure II. If the supply voltage is varied from 0 to 100 V, then breakdown occurs in.
Which of the following statements are not correct? (A) Precision rectifiers use positive feedback to compensate for the forward drop of the diodes (B) Precision peak detector uses a capacitor to effectively lengthen the duration of the peaks (C) Limiters may be thought of as programmable signal clippers (D) In order to improve performance of comparators negative feedback may be used (E) There are two basic approaches for realizing a design : (1) using zener diodes and (2) using biased-signal diode network Choose the most appropriate answer from the options given below: (1) (A) and (D) only (2) (D) and (E) only (3) (A) and (C) only (4) (B) and (D) only
Consider the following diodes: 1. Gunn diode 2. Schottky diode 3. Crystal diode 4. Tunnel diode Which of these can be used as detector diodes?
In the given circuit, if the diode D2 is a Germanium diode and all other diodes are Silicon diodes, then which of the following statements is true?
Which of the following statements is/are correct? 1. The earth is nearest to the Sun at Perihelion, which generally occurs on January 3. 2. The earth is farthest away from the Sun at Perihelion, which generally occurs on July 4. 3. The earth is farthest away from the Sun at Aphelion, which generally occurs on July 4. 4. The earth is nearest to the Sun at Aphelion, which generally occurs on January 3. Select the correct answer using the code given below:
Which of the following types of power have to be pre-justified; and, when the need and occasion arise, must very soon be post-justified ?  1. Reward power 2. Coercive power 3. Legitimate power 4. Expert power 5. Referent power Which of the above statements are correct ? 
List I embodies situational leadership style and List II indicates the power resource which supports them. List I Situational leadership style List II Power resource a)  Directive style (HT / LR) i) Expert power b) Supportive style (HT / HR) ii)  Information power c) Participative style (LT / HR) iii)  Reward power d)  Delegating style (LT / LR) iv)  Coercive power   *HT = High Task LT = Low Task HR = High Relationship LR = Low Relationship Choose the correct answer from the options given below:
Which of the following statements are true about soft power?
1. Soft power can be used by state actors.
2. Soft power can be used by non-state actors.
3. Soft power is the second face of power.
4. Soft power is a form of idealism.
Select the correct answer:
Which of the following is a common signal found in power supplies after the since wave input power has been rectified using a diode or diodes and if an output filter capacitor is not used?