In the below figure the average load current is 15 A. The rms value of transform

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Power Electronics Comments

Question
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

Correct Answer

10.61 A

Explanation

RMS secondary current =

In the below figure the average load current is 15 A. The rms value of transformer secondary current

= 15/1.414 = 10.608 A.

Power Electronics problems

Search Results

1. 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

2. 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.

3. 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

5. 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

6. 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

7. 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

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

10. Assertion (A): A transistor requires a continuous base signal for conduction but a thyristor requires a gate pulse.
Reason (R): Transistor find widespread application in power electronic circuits.
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: