Assertion (A): A TRIAC is a bidirectional SCR. Reason (R): A TRIAC is a four lay

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Question
Assertion (A): A TRIAC is a bidirectional SCR.
Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.
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

Correct Answer

Both A and R are correct and R is correct explanation of A

Explanation

Since a TRIAC can conduct in both directions it is bi directional SCR.

Power Electronics problems

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1. A single phase half wave rectifier is feeding a resistive load. Input voltage v = V_m sin ?t. The output dc voltage is V_dc and output rms voltage is V_rms . If firing angle is 180�, V_dc and V_rms respectively are
Options
A. 0 and 0
B.
C. 0 and - V_m
D.

2. The function f(x - v_ot) represent which of the following?
Options
A. A stationary wave
B. A wave motion in forward direction
C. A wave motion in reverse direction
D. None of the above

4. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.
Options
A. 130 p
B. 1.3 p
C. 120 p
D. 12 p

5. In a conductor which of the following relations hold good?
Options
A. ? x D = r
B. ? . D = r
C. ? x D = 0
D. ? . D = 0

6. In the below figure the average load current is 15 A. The rms value of transformer secondary current is
Options
A. 15 A
B. 10.61 A
C. 7.5 A
D. 14.14 A

7. In a circuit using a full wave converter (M - 2 connection) the PIV of each thyristor is 400 V. For the same output voltage and fully controlled bridge converter, PIV will be
Options
A. 400 V
B. 800 V
C. 200 V
D. 2002 V

8. If V_dc1 is the dc output voltage in half wave controlled rectifier circuit feeding resistive load and V_dc2 is the dc output voltage in full wave controlled rectifier circuit (M - 2 connection) feeding resistive load, then
Options
A. V_dc1 = 0.5 V_dc2 for all values of firing angle
B. V_dc1 = V_dc2 for all values of firing angle
C. V_dc1 ? 0.5 V_dc2 for all values of firing angle
D. V_dc1 ? 0.5 V_dc2 for all values of firing angle

10. Current derating may be necessary when thyristors are operating in
Options
A. series
B. parallel
C. series or parallel
D. none of the above

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