Govt Exams Mock Test FREE | Online Quiz Competition

Q1. How many input and output required for multiplexer ?

one input and one output

one input and many output

many input and one output

number of selection inputs and one output

Q2. If an SCR gate cathode characteristic is a straight line of 130 and allowable gate power dissipation of 0.7 W, then the gate voltage is ________.

12 V

8.14 V

9. 53 V

5.78 V

Q3. A dc voltage source of 250 V is supplying R-L load through an SCR and latching current for an SCR is 130 mA . Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 25 \(\Omega\) in series with L = 0.5 H.

\(260 \mu s\)

\(320 \mu s\)

\(150 \mu s\)

\(170 \mu s\)

Q4. 6 thyristors each of 250 V are connected in series. The Derating factor of the string is 0.15. Calculate the operating voltage of the string.

1200 V

1500 V

1275 V

1300 V

Q5. A buck converter operating at duty cycle of 0.5 with input voltage of 150 V dc supplies an RLE load consist of R = 5 \(\Omega\), L = 4 mH, E = 50V. The input current of the buck converter will be,

3.5A

3A

2.5A

1.5A

Q6. The fully controlled thyristor converter in the figure is fed from a single phase source. When the firing angle is 0˚, the DC output voltage of the converter is 300 V. What will be the output voltage for firing angle of 60˚? (Assume continuous conduction) <br><br>

150 V

300 V

210 V

100π V

Q7. A single phase half wave diode rectifier with RE load is supplied by a source voltage of 230 V, 50 Hz and for R=18 ohm , E=100 V. Find the peak inverse voltage(PIV) of diode

130.18 V

425.26 V

560.21 V

330 V

Q8. A single phase AC voltage controller is controlling current in a purely inductive load. If the firing angle of SCR is \(\alpha\), what will be the conduction angle of the SCR?

\(2\pi - \alpha \)

\(\pi \)

\(\pi - \alpha \)

\(2\pi\)

Q9. The power factor of a single phase full wave diode bridge rectifier is

0.45 lagging

0.707 lagging

0.9 lagging

0.707 leading

Q10. A fully controlled natural commutated 3-phase bridge rectifier is operating with a firing angle \(\alpha=30^\circ\), The peak to peak voltage ripple expressed as a ratio of the peak output dc voltage at the output of the converter bridge is

\(1-\frac{\sqrt3}{2}\)

\(\sqrt3-1\)

\(\frac{\sqrt3}{2}\)

0.5

Quiz

Year 2025

February
Week # 4 Quiz 1

Q1. How many input and output required for multiplexer ?

Q2. If an SCR gate cathode characteristic is a straight line of 130 and allowable gate power dissipation of 0.7 W, then the gate voltage is ________.

Q3. A dc voltage source of 250 V is supplying R-L load through an SCR and latching current for an SCR is 130 mA . Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 25 \(\Omega\) in series with L = 0.5 H.

Q4. 6 thyristors each of 250 V are connected in series. The Derating factor of the string is 0.15. Calculate the operating voltage of the string.

Q5. A buck converter operating at duty cycle of 0.5 with input voltage of 150 V dc supplies an RLE load consist of R = 5 \(\Omega\), L = 4 mH, E = 50V. The input current of the buck converter will be,

Q6. The fully controlled thyristor converter in the figure is fed from a single phase source. When the firing angle is 0˚, the DC output voltage of the converter is 300 V. What will be the output voltage for firing angle of 60˚? (Assume continuous conduction) <br><br>

Q7. A single phase half wave diode rectifier with RE load is supplied by a source voltage of 230 V, 50 Hz and for R=18 ohm , E=100 V. Find the peak inverse voltage(PIV) of diode

Q8. A single phase AC voltage controller is controlling current in a purely inductive load. If the firing angle of SCR is \(\alpha\), what will be the conduction angle of the SCR?

Q9. The power factor of a single phase full wave diode bridge rectifier is

Q10. A fully controlled natural commutated 3-phase bridge rectifier is operating with a firing angle \(\alpha=30^\circ\), The peak to peak voltage ripple expressed as a ratio of the peak output dc voltage at the output of the converter bridge is

Quiz

Year 2025

February Week # 1 Expire on 28 Feb 2025

February Week # 2 Expire on 07 Mar 2025

February Week # 3 Expire on 14 Mar 2025

February Week # 4 Expire on 21 Mar 2025

February Week # 4 Quiz 1

Q1. How many input and output required for multiplexer ?

Q2. If an SCR gate cathode characteristic is a straight line of 130 and allowable gate power dissipation of 0.7 W, then the gate voltage is ________.

Q3. A dc voltage source of 250 V is supplying R-L load through an SCR and latching current for an SCR is 130 mA . Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 25 \(\Omega\) in series with L = 0.5 H.

Q4. 6 thyristors each of 250 V are connected in series. The Derating factor of the string is 0.15. Calculate the operating voltage of the string.

Q5. A buck converter operating at duty cycle of 0.5 with input voltage of 150 V dc supplies an RLE load consist of R = 5 \(\Omega\), L = 4 mH, E = 50V. The input current of the buck converter will be,

Q6. The fully controlled thyristor converter in the figure is fed from a single phase source. When the firing angle is 0˚, the DC output voltage of the converter is 300 V. What will be the output voltage for firing angle of 60˚? (Assume continuous conduction) <br><br>

Q7. A single phase half wave diode rectifier with RE load is supplied by a source voltage of 230 V, 50 Hz and for R=18 ohm , E=100 V. Find the peak inverse voltage(PIV) of diode

Q8. A single phase AC voltage controller is controlling current in a purely inductive load. If the firing angle of SCR is \(\alpha\), what will be the conduction angle of the SCR?

Q9. The power factor of a single phase full wave diode bridge rectifier is

Q10. A fully controlled natural commutated 3-phase bridge rectifier is operating with a firing angle \(\alpha=30^\circ\), The peak to peak voltage ripple expressed as a ratio of the peak output dc voltage at the output of the converter bridge is

Record & Track Your Performance

February
Week # 4 Quiz 1