Govt Exams Mock Test FREE | Online Quiz Competition

Q1. A 3 phase voltage source inverter with ideal devices operating in 180 degree conduction mode is feeding a balanced star-connected resistive load. If the input dc voltage is \(V_{dc}\) ,then the peak fundamental component of the phase voltage is___________,

\(\pi V_{dc}\)

\(2\pi V_{dc}\)

\(\frac {V_{dc}}{\pi}\)

\(\frac {2 V_{dc}}{\pi}\)

Q2. Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

10 kV

4 kV

6 kV

5 kV

Q3. A power MOSFET has three terminals called_________.

source, drain and gate

emitter, base and collector

base, source and drain

gate, emitter and collector

Q4. If 'f' is the supply frequency, then in a 3-phase full converter, the output voltage pulsates at a frequency equal to _______.

6f

2f

3f

f

Q5. In a step-up chopper circuit, if \(V_s\) is the source voltage and \(\alpha\) is duty cycle, then the output voltage is

\(V_s /(1 +\alpha)\)

\(V_s (1 +\alpha)\)

\(V_s (1 - \alpha)\)

\(V_s /(1 - \alpha)\)

Q6. A freewheeling diode is sometime connected in an inductive load circuit in a half wave rectifiers circuits___________.

To conduct during the negative half of the supply

To give better filtering and reduce ripple

To conduct so as to reduce the angle of conduction to \(\pi\)

To improve transformer utilization

Q7. In a thyristor, holding current is

more than latching current

less than latching current

equal to latching current

very small

Q8. In measurement system which of the following static characteristics are desirable ?

Sensitivity

Accuracy

Reproducibility

All of above

Q9. A thermistor is a

Thermocouple

Thermometer

Miniature resistance

None of the above

Q10. If an energy meter disc makes 10 revolutions in 100 seconds when a load of 500 W is connected to it, the meter constant is

820 rev/kWh

920 rev/kWh

720 rev/kWh

620 rev/kWh

Quiz

Year 2024

December
Week # 4 Quiz 2

Q1. A 3 phase voltage source inverter with ideal devices operating in 180 degree conduction mode is feeding a balanced star-connected resistive load. If the input dc voltage is \(V_{dc}\) ,then the peak fundamental component of the phase voltage is___________,

Q2. Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

Q3. A power MOSFET has three terminals called_________.

Q4. If 'f' is the supply frequency, then in a 3-phase full converter, the output voltage pulsates at a frequency equal to _______.

Q5. In a step-up chopper circuit, if \(V_s\) is the source voltage and \(\alpha\) is duty cycle, then the output voltage is

Q6. A freewheeling diode is sometime connected in an inductive load circuit in a half wave rectifiers circuits___________.

Q7. In a thyristor, holding current is

Q8. In measurement system which of the following static characteristics are desirable ?

Q9. A thermistor is a

Q10. If an energy meter disc makes 10 revolutions in 100 seconds when a load of 500 W is connected to it, the meter constant is

Quiz

Year 2024

December Week # 1 Expire on 31 Dec 2024

December Week # 2 Expire on 07 Jan 2025

December Week # 3 Expire on 14 Jan 2025

December Week # 4 Expire on 21 Jan 2025

December Week # 4 Quiz 2

Q1. A 3 phase voltage source inverter with ideal devices operating in 180 degree conduction mode is feeding a balanced star-connected resistive load. If the input dc voltage is \(V_{dc}\) ,then the peak fundamental component of the phase voltage is___________,

Q2. Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

Q3. A power MOSFET has three terminals called_________.

Q4. If 'f' is the supply frequency, then in a 3-phase full converter, the output voltage pulsates at a frequency equal to _______.

Q5. In a step-up chopper circuit, if \(V_s\) is the source voltage and \(\alpha\) is duty cycle, then the output voltage is

Q6. A freewheeling diode is sometime connected in an inductive load circuit in a half wave rectifiers circuits___________.

Q7. In a thyristor, holding current is

Q8. In measurement system which of the following static characteristics are desirable ?

Q9. A thermistor is a

Q10. If an energy meter disc makes 10 revolutions in 100 seconds when a load of 500 W is connected to it, the meter constant is

Record & Track Your Performance

December
Week # 4 Quiz 2