141. In the circuit shown in the figure, the maximum current in the main SCR can be (given I₀ = 70.7) ______ A .
     

1. 1. 170.7

   
   
   

   2. 70.7

   
   
   

   3. 170

   
   
   

   4. 107.7

   
   
   

---

1. View Hint View Answer Discuss in Forum

   IPeak = Io + Vs

   = 70.7 + 200

   
   = 170.7 A

   Correct Option: A

   IPeak = Io + Vs

   = 70.7 + 200

   
   = 170.7 A

---

142. A SCR has an anode supply of sine voltage 200 V rms., 50 Hz applied through a 100Ω resistor and fired at an angle of 60°. Assuming no voltage drop, the rms value of the output voltage is ______V .

1. 1. 326.7

   
   
   

   2. 126.7

   
   
   

   3. 101.7

   
   
   

   4. All of the above

   
   
   

---

1. View Hint View Answer Discuss in Forum

   
   rms values will be required for calculating power to lamps, heating elements, etc.

   Correct Option: B

   
   rms values will be required for calculating power to lamps, heating elements, etc.

---

---

143. In the circuit shown in the figure, the switch is closed at time t = 0. The steady state value of the voltage V_c is ______V.
     
     

1. 1. 0

   
   
   

   2. 3

   
   
   

   3. 5

   
   
   

   4. 7

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

---

144. In the figure, if C = 8 F and L = 0.2 mH and V₀ = 200V, then peak current through diode is given by ______ A.
     

1. 1. 40

   
   
   

   2. 80

   
   
   

   3. 150

   
   
   

   4. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   

   Correct Option: A

   

---

---

145. The average on-state current for an SCR is 20 A for a conduction angle of 120°. The average on state current for 60° conduction angle will be ______A .

1. 1. 10

   
   
   

   2. 20

   
   
   

   3. 30

   
   
   

   4. 40

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Iav =	Im
   	form factor

   
   where, form factor for 120° = 1.878 and form factor for 60° = 2.7781
   So, I_av is less than 20 A

   Correct Option: B

   Iav =	Im
   	form factor

   
   where, form factor for 120° = 1.878 and form factor for 60° = 2.7781
   So, I_av is less than 20 A

---