Govt Exams Mock Test FREE | Online Quiz Competition

Q1. The percentage resolution of 6 bit Digital to Analog convertor would be

1.58%

2.34%

3.21%

3.64%

Q2. A dc voltage source of is supplying R-L load through an SCR with pulse width of \(100 \mu s\). Latching current of SCR is 100 mA in case load consists of R = 20 \(\Omega\) in series with L = 0.5 H.

250 V

100 V

150 V

200 V

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. A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120° duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, is

234

245

300

331

Q5. 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 a firing angle of 60°, assuming continuous conduction?

300

150

200

700

Q6. For an SCR gate cathode characteristic is a straight line of 110 and allowable gate power dissipation is 0.5 W. Compute the gate current.

0.08 A

0.067 A

0.057 A

0.047 A

Q7. What is the maximum firing angle achievable using resistance-capacitance triggering of SCR?

\(180^\circ\)

\(30^\circ\)

\(60^\circ\)

\(90^\circ\)

Q8. A single-phase full-wave uncontrolled bridge rectifier is supplying a highly inductive load (L/R ratio is very large), the load current is assumed to be smooth and ripple –free. If the supply voltage is 230V, 50Hz, and the inductor load resistance R = 20 \(\Omega\), Calculate the average output voltage.

207.07 V

156.5 V

103.5 V

199 V

Q9. Identify the expression:
\(\frac{V_{max}}{2\pi R_L}(1+cos\alpha)\)

The average current in a full wave rectifier circuit constructed with the help of diodes

The average current in a full wave rectifier circuit constructed with the help of SCRs

The average current in a half wave rectifier circuit constructed with the help of diodes

The average current in a half wave rectifier circuit constructed with the help of SCRs

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

January
Week # 4 Quiz 1

Q1. The percentage resolution of 6 bit Digital to Analog convertor would be

Q2. A dc voltage source of is supplying R-L load through an SCR with pulse width of \(100 \mu s\). Latching current of SCR is 100 mA in case load consists of R = 20 \(\Omega\) in series with L = 0.5 H.

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. A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120° duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, is

Q5. 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 a firing angle of 60°, assuming continuous conduction?

Q6. For an SCR gate cathode characteristic is a straight line of 110 and allowable gate power dissipation is 0.5 W. Compute the gate current.

Q7. What is the maximum firing angle achievable using resistance-capacitance triggering of SCR?

Q9. Identify the expression:
\(\frac{V_{max}}{2\pi R_L}(1+cos\alpha)\)

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

Quiz

Year 2024

August Week # 4 Expire on 21 Sep 2024

September Week # 1 Expire on 30 Sep 2024

September Week # 2 Expire on 07 Oct 2024

September Week # 3 Expire on 14 Oct 2024

January Week # 4 Quiz 1

Q1. The percentage resolution of 6 bit Digital to Analog convertor would be

Q2. A dc voltage source of is supplying R-L load through an SCR with pulse width of \(100 \mu s\). Latching current of SCR is 100 mA in case load consists of R = 20 \(\Omega\) in series with L = 0.5 H.

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. A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120° duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, is

Q5. 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 a firing angle of 60°, assuming continuous conduction?

Q6. For an SCR gate cathode characteristic is a straight line of 110 and allowable gate power dissipation is 0.5 W. Compute the gate current.

Q7. What is the maximum firing angle achievable using resistance-capacitance triggering of SCR?

Q9. Identify the expression: \(\frac{V_{max}}{2\pi R_L}(1+cos\alpha)\)

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

Record & Track Your Performance

January
Week # 4 Quiz 1

Q9. Identify the expression:
\(\frac{V_{max}}{2\pi R_L}(1+cos\alpha)\)