Thyristors are not suitable for logic circuits. True False Thyristors can be use

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Power Electronics Comments

Question
Thyristors are not suitable for logic circuits.
Options
A. True
B. False

Correct Answer

False

Explanation

Thyristors can be used for logic circuits.

Power Electronics problems

Search Results

2. The characteristics of a non-linear resistance is i = kv⁴. If i becomes 100 times, v becomes
Options
A. about 100 times
B. about 10 times
C. about 3 times
D. about twice

3. A thyristor has a maximum allowable junction temperature of 120�C and the ambient temperature is 40�C. If thermal resistance is 1.6� C/W, the maximum allowable internal power dissipation is
Options
A. 20 W
B. 50 W
C. 92 W
D. 128 W

4. Assertion (A): An ideal rectifier should have unity harmonic factor
Reason (R): An ideal rectifier should have unity displacement factor.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

5. In a thyristor the gate current is increased, then
Options
A. anode current will increase
B. anode current will decrease
C. anode current will remain constant
D. anode current may increase or decrease

7. For a 12 pulse operation, the two 6 pulse units are fed by
Options
A. Y - Y and Y - Y transformers
B. ? - ? and ? - ? transformers
C. Y - Y and Y - ? transformers
D. Y - ? and Y - ? transformers

8. In a step down chopper using pulse width modulation, T_on = 3 x 10^-3 and T_off = 1 x 10^-3 s. The chopping frequency is
Options
A. 333.33
B. 250
C. 500
D. 1000

9. A two winding transformer is feeding a single phase half wave rectifier circuit. The load is purely resistive. The rms value of transformer secondary current is I_s and rms value of load current in I_rms. Then
Options
A. I_s = I_rms irrespective of the value of firing angle
B. I_s = 0.5 I_rms irrespective of the value of firing angle
C. I_s = I_rms if firing angle is less than 30�
D. I_s = I_rms if firing angle is more than 30�

10. Assertion (A): Power transistor has lower switching time than SCR
Reason (R): Power transistor has greater switching time than SCR
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Comments

There are no comments.

More in Electronics and Communication Engineering: