Govt Exams Mock Test FREE | Online Quiz Competition

Q1. When will be the output of an AND gate is HIGH if there are three inputs, A, B, and C ?

A = 0, B = 0, C = 0

A = 1, B = 1, C = 0

A = 1, B = 0, C = 1

A = 1, B = 1, C = 1

Q2. A 220 V DC supply is connected to a DC chopper which is operating on TRC control mode at a frequecy of 5 kHz. When the output is 110 V, the ON and OFF period of each cycle are respectively

150 \(\mu s\),50 \(\mu s\)

50 \(\mu s\),50 \(\mu s\)

50 \(\mu s\),150 \(\mu s\)

100 \(\mu s\),100 \(\mu s\)

Q3. 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

Q4. 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

Q5. An SCR is triggered at 30° in the positive half cycle only. The average anode current is 40 A. If the firing angle is changed to 80°, the average anode current is likely to be

34.68 A

25.14 A

87.62 A

68.64 A

Q6. A single phase half wave rectifier is feeding a resistive load. When \(\alpha = 0\), dc output voltage is 134 V. When \(\alpha = 45°\), the dc output voltage will be about

110.5 V

94.7 V

228.7 V

114.4 V

Q7. The peak inverse voltage in ac to dc converter system is highest in

single phase full wave mid-point converter

single phase full wave

3 phase bridge converter

3 phase half wave converter

Q8. The reverse recovery time of diode \(t_{rr} = 3.5 \:\mu s\) and the stored charge \(Q_{RR} = 122.5\:\mu C \). Calculate the rate of change of the diode current \(di/dt \).

\(30 \:A/\mu s\)

\(20 \:A/\mu s\)

\(25 \:A/\mu s\)

\(27 \:A/\mu s\)

Q9. In signal pulse modulation of PWM inverter,\(5^{th}\) harmonic can be eliminated if pulse width is equal to __________degree.

30

72

36

108

Q10. The scaling factor using MOS device using constant voltage scaling model, the gate area of the device will be scaled as

\(1/a\)

\(1/a^4\)

\(1/a^2\)

\(1/a^3\)

Quiz

Year 2024

August
Week # 4 Quiz 1

Q1. When will be the output of an AND gate is HIGH if there are three inputs, A, B, and C ?

Q2. A 220 V DC supply is connected to a DC chopper which is operating on TRC control mode at a frequecy of 5 kHz. When the output is 110 V, the ON and OFF period of each cycle are respectively

Q3. 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 ________.

Q4. 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.

Q5. An SCR is triggered at 30° in the positive half cycle only. The average anode current is 40 A. If the firing angle is changed to 80°, the average anode current is likely to be

Q6. A single phase half wave rectifier is feeding a resistive load. When \(\alpha = 0\), dc output voltage is 134 V. When \(\alpha = 45°\), the dc output voltage will be about

Q7. The peak inverse voltage in ac to dc converter system is highest in

Q8. The reverse recovery time of diode \(t_{rr} = 3.5 \:\mu s\) and the stored charge \(Q_{RR} = 122.5\:\mu C \). Calculate the rate of change of the diode current \(di/dt \).

Q9. In signal pulse modulation of PWM inverter,\(5^{th}\) harmonic can be eliminated if pulse width is equal to __________degree.

Q10. The scaling factor using MOS device using constant voltage scaling model, the gate area of the device will be scaled as

Quiz

Year 2024

July Week # 1 Expire on 31 Jul 2024

July Week # 2 Expire on 07 Aug 2024

July Week # 3 Expire on 14 Aug 2024

July Week # 4 Expire on 21 Aug 2024

August Week # 4 Quiz 1

Q1. When will be the output of an AND gate is HIGH if there are three inputs, A, B, and C ?

Q2. A 220 V DC supply is connected to a DC chopper which is operating on TRC control mode at a frequecy of 5 kHz. When the output is 110 V, the ON and OFF period of each cycle are respectively

Q3. 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 ________.

Q4. 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.

Q5. An SCR is triggered at 30° in the positive half cycle only. The average anode current is 40 A. If the firing angle is changed to 80°, the average anode current is likely to be

Q6. A single phase half wave rectifier is feeding a resistive load. When \(\alpha = 0\), dc output voltage is 134 V. When \(\alpha = 45°\), the dc output voltage will be about

Q7. The peak inverse voltage in ac to dc converter system is highest in

Q8. The reverse recovery time of diode \(t_{rr} = 3.5 \:\mu s\) and the stored charge \(Q_{RR} = 122.5\:\mu C \). Calculate the rate of change of the diode current \(di/dt \).

Q9. In signal pulse modulation of PWM inverter,\(5^{th}\) harmonic can be eliminated if pulse width is equal to __________degree.

Q10. The scaling factor using MOS device using constant voltage scaling model, the gate area of the device will be scaled as

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August
Week # 4 Quiz 1