Govt Exams Mock Test FREE | Online Quiz Competition

Q1. One disadvantage of RAM is that it is

Slow

Bulky

Inaccurate

volatile

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 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 current.

20.70 A

10.35 A

15.65 A

5.17 A

Q4. 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

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 thyristor-bridge rectifier is fed from a 230V, 50 Hz, single-phase, AC mains. If it is delivering a constant DC current of 10 A, at firing angle of 30°, then value of the power factor at AC mains is

0.87

0.9

0.78

0.45

Q7. An electric heater is controlled by thyristors through on-off control. If \(\alpha = 0.4\), the heating is

4% of maximum

16% maximum

40% of maximum

64% of maximum

Q8. Gate characteristic of a thyristor

Has a spread between two curves \(V_g - I_g\)

Is of the type \(V_g = a + bI_g\)

Is a curve between \(V_g \:\&\: I_g\) and origin

Is a Straight line passing through origin

Q9. The threshold voltage of an N-channel enhancement mode MOSFET is 0.5 V. When the device is biased at a gate voltage of 3 V. pinch-off would occur at a drain voltage of

2.5 V

1.5 V

3.5 V

4.5 V

Q10. 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

Quiz

Year 2024

October
Week # 4 Quiz 1

Q1. One disadvantage of RAM is that it is

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 ________.

Q4. 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

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 thyristor-bridge rectifier is fed from a 230V, 50 Hz, single-phase, AC mains. If it is delivering a constant DC current of 10 A, at firing angle of 30°, then value of the power factor at AC mains is

Q7. An electric heater is controlled by thyristors through on-off control. If \(\alpha = 0.4\), the heating is

Q8. Gate characteristic of a thyristor

Q9. The threshold voltage of an N-channel enhancement mode MOSFET is 0.5 V. When the device is biased at a gate voltage of 3 V. pinch-off would occur at a drain voltage of

Q10. The peak inverse voltage in ac to dc converter system is highest in

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

October Week # 4 Quiz 1

Q1. One disadvantage of RAM is that it is

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 ________.

Q4. 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

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 thyristor-bridge rectifier is fed from a 230V, 50 Hz, single-phase, AC mains. If it is delivering a constant DC current of 10 A, at firing angle of 30°, then value of the power factor at AC mains is

Q7. An electric heater is controlled by thyristors through on-off control. If \(\alpha = 0.4\), the heating is

Q8. Gate characteristic of a thyristor

Q9. The threshold voltage of an N-channel enhancement mode MOSFET is 0.5 V. When the device is biased at a gate voltage of 3 V. pinch-off would occur at a drain voltage of

Q10. The peak inverse voltage in ac to dc converter system is highest in

Record & Track Your Performance

October
Week # 4 Quiz 1