Govt Exams Mock Test FREE | Online Quiz Competition

Q1. The universal shift register can be used as

Serial to parallel conversion

Parallel to serial conversion

Serial to serial conversion

a,b and c

Q2. The power factor of a single phase AC voltage controller feeding power to a pure resistive load is

4 \(\times\) (per unit load power)^1/2

(per unit load power)^1/2

(per unit load power)/2

2 \(\times\) (per unit load power)

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. 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 single phase full wave AC voltage controller has a resistive load of 10 Ω and the input voltage is 230 V, 50 Hz. The delay angle of both the thyristors are \(45^\circ\). The input power factor is

0.853

0.953

0.707

0.505

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 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?

\(\pi \)

\(\pi - \alpha \)

\(2\pi - \alpha \)

\(2\pi\)

Q8. An SCR has half cycle surge current rating of 2500 A for 50 Hz supply. One cycle surge current will be

2500 A

1250 A.

3535.53 A

1767.76 A

Q9. A string of n parallel SCRs is operated at 68 KA, the rating of each SCR is 1.2 KA. If derating factor of the string is 0.1. Then calculate the value of n

67

56

60

63

Q10. Which of the following statements, for phase sequence of harmonics in a 3-phase balanced system with phase sequence as ABC, is true?

For all triplen harmonics, the phase angle difference between any two phases (of respective harmonic only) is zero.

All odd harmonics except triplen harmonics have phase sequence ABC.

All even harmonics except triplen harmonics have negative phase sequence ACB

For odd triplen harmonics only, the phase angle difference between any two phases (of respective harmonic only) is zero.

Quiz

Year 2024

August
Week # 4 Quiz 1

Q1. The universal shift register can be used as

Q2. The power factor of a single phase AC voltage controller feeding power to a pure resistive load is

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. 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 single phase full wave AC voltage controller has a resistive load of 10 Ω and the input voltage is 230 V, 50 Hz. The delay angle of both the thyristors are \(45^\circ\). The input power factor is

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 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?

Q8. An SCR has half cycle surge current rating of 2500 A for 50 Hz supply. One cycle surge current will be

Q9. A string of n parallel SCRs is operated at 68 KA, the rating of each SCR is 1.2 KA. If derating factor of the string is 0.1. Then calculate the value of n

Q10. Which of the following statements, for phase sequence of harmonics in a 3-phase balanced system with phase sequence as ABC, is true?

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

August Week # 4 Quiz 1

Q1. The universal shift register can be used as

Q2. The power factor of a single phase AC voltage controller feeding power to a pure resistive load is

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. 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 single phase full wave AC voltage controller has a resistive load of 10 Ω and the input voltage is 230 V, 50 Hz. The delay angle of both the thyristors are \(45^\circ\). The input power factor is

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 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?

Q8. An SCR has half cycle surge current rating of 2500 A for 50 Hz supply. One cycle surge current will be

Q9. A string of n parallel SCRs is operated at 68 KA, the rating of each SCR is 1.2 KA. If derating factor of the string is 0.1. Then calculate the value of n

Q10. Which of the following statements, for phase sequence of harmonics in a 3-phase balanced system with phase sequence as ABC, is true?

Record & Track Your Performance

August
Week # 4 Quiz 1