Govt Exams Mock Test FREE | Online Quiz Competition

Q1. The gate whose output is high only when both the inputs are high is:

AND gate

X-OR gate

NOR gate

X-NOR gate

Q2. A boost converter operating at duty cycle of 0.5 with input voltage of 100 V dc suppling a resistive load of 100 \(\Omega\). The input current of the buck converter will be,

4A

8A

2A

1A

Q3. 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

Q4. For an SCR gate cathode characteristic is a straight line of 150. For triggered source voltage of 12 V and allowable gate power dissipation of 0.5 W. Compute the gate source resistance.

\(57.88 \:\Omega\)

\(41.19\: \Omega\)

\(208 \:\Omega\)

\(150\: \Omega\)

Q5. An ideal 230 V, 50 Hz single-phase AC source supplies power to a load resistor \(100\:\Omega\) through a single ideal diode. Calculate the average value of the current.

1.03 A

1.75 A

2.06 A

2.35 A

Q6. A thyristor has thermal resistance is 1.8 °C/W and the maximum allowable internal power dissipation is 50 W. If the ambient temperature is 40 °C, the maximum allowable Junction temperature is

110 °C

130 °C

50 °C

90 °C

Q7. 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

Q8. If \(t_{on}\) and \(t_{off}\) are the turn on and turn off times of a thyristor, then

\(t_{on} >> t_{off}\)

\(t_{on} = t_{off}\)

\(t_{on} << t_{off}\)

\(t_{on} = 2 *t_{off}\)

Q9. In a three-phase half wave rectifier, the ratio of average output voltage per phase to maximum AC voltage is

1

1.169

0.827

1.571

Q10. In a 12 pulse valve group operation the most troublesome harmonics on ac side are

\(11^{th}\) and \(13^{th}\)

\(23^{rd}\) and \(25^{th}\)

\(5^{th}\) and \(7^{th}\)

\(3^{rd}\) and \(5^{th}\)

Quiz

Year 2024

June
Week # 4 Quiz 1

Q1. The gate whose output is high only when both the inputs are high is:

Q2. A boost converter operating at duty cycle of 0.5 with input voltage of 100 V dc suppling a resistive load of 100 \(\Omega\). The input current of the buck converter will be,

Q3. 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>

Q4. For an SCR gate cathode characteristic is a straight line of 150. For triggered source voltage of 12 V and allowable gate power dissipation of 0.5 W. Compute the gate source resistance.

Q5. An ideal 230 V, 50 Hz single-phase AC source supplies power to a load resistor \(100\:\Omega\) through a single ideal diode. Calculate the average value of the current.

Q6. A thyristor has thermal resistance is 1.8 °C/W and the maximum allowable internal power dissipation is 50 W. If the ambient temperature is 40 °C, the maximum allowable Junction temperature is

Q7. The power factor of a single phase full wave diode bridge rectifier is

Q8. If \(t_{on}\) and \(t_{off}\) are the turn on and turn off times of a thyristor, then

Q9. In a three-phase half wave rectifier, the ratio of average output voltage per phase to maximum AC voltage is

Q10. In a 12 pulse valve group operation the most troublesome harmonics on ac side are

Quiz

Year 2024

October Week # 1 Expire on 31 Oct 2024

October Week # 2 Expire on 07 Nov 2024

October Week # 3 Expire on 14 Nov 2024

October Week # 4 Expire on 21 Nov 2024

June Week # 4 Quiz 1

Q1. The gate whose output is high only when both the inputs are high is:

Q2. A boost converter operating at duty cycle of 0.5 with input voltage of 100 V dc suppling a resistive load of 100 \(\Omega\). The input current of the buck converter will be,

Q3. 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>

Q4. For an SCR gate cathode characteristic is a straight line of 150. For triggered source voltage of 12 V and allowable gate power dissipation of 0.5 W. Compute the gate source resistance.

Q5. An ideal 230 V, 50 Hz single-phase AC source supplies power to a load resistor \(100\:\Omega\) through a single ideal diode. Calculate the average value of the current.

Q6. A thyristor has thermal resistance is 1.8 °C/W and the maximum allowable internal power dissipation is 50 W. If the ambient temperature is 40 °C, the maximum allowable Junction temperature is

Q7. The power factor of a single phase full wave diode bridge rectifier is

Q8. If \(t_{on}\) and \(t_{off}\) are the turn on and turn off times of a thyristor, then

Q9. In a three-phase half wave rectifier, the ratio of average output voltage per phase to maximum AC voltage is

Q10. In a 12 pulse valve group operation the most troublesome harmonics on ac side are

Record & Track Your Performance

June
Week # 4 Quiz 1