Govt Exams Mock Test FREE | Online Quiz Competition

Q1. A 3-phase inverter delivers power to a resistive load from a DC source '\(V_s\) '. For star connected load of 'R' \(\Omega\) per phase, the RMS value of load current (\(I_{or}\) ) for 180 degree conduction mode is _________.

\(I_{or}=\frac{1}{3\sqrt{2}}(\frac{V_s}{R})\)

\(I_{or}=\frac{\sqrt{2}}{3}(\frac{V_s}{R})\)

\(I_{or}=\frac{1}{\sqrt{2}}(\frac{V_s}{R})\)

\(I_{or}=\frac{1}{3}(\frac{V_s}{R})\)

Q2. A six pulse thyristor rectifier bridge is connected to a balanced 50 Hz three phase ac source. Assuming that the DC output current of the rectifier is constant. The lowest frequency harmonics component of the ac source line current is

100 Hz

150 Hz

250 Hz

300 Hz

Q3. Single phase full converter can operate in

4 quadrants

3 quadrants

2 quadrants

1 quadrants

Q4. The purpose of freewheeling diode in a convertor circuit is:

To provide path for current when the switch is ON

To oppose the load voltage

To oppose the source voltage

To provide path for current when the switch is OFF

Q5. In an SCR

gate current is directly proportional to forward breakover voltage

as gate current is raised, forward breakover voltage reduces

gate current has to be kept on continuously for conduction

forward breakover voltage is low in the forward blocking state

Q6. The selection of rectifier diode mostly depends on the

forward voltage

reverse voltage

fault current

average load current

Q7. Which chopper circuit operates in all the 4 quadrants?

A

C

D

E

Q8. Two equal voltages of same frequency applied to the X and Y plates of a CRO, produce a circle on the screen. The phase difference between the two voltages is

\(0^\circ\)

\(60^\circ\)

\(90^\circ\)

\(180^\circ\)

Q9. A wheatstone bridge can not be used for precision measurements because errors are introduced into on account of

Resistance of connecting leads

Thermoelectric emfs

contact resistances

All of these

Q10. Consider the following two statements and identify the correct option.
Statement 1: Piezoelectric transducer requires external power supply for their operation and is not self generating.
Statement 2 : Thermistor do not require any external source of supply for their operation and is self generating.

Statement - 1 is FALSE and Statement – 2 is TRUE

Both Statement -1 and Statement – 2 are TRUE

Both Statement -1 and Statement – 2 are FALSE

Statement - 1 is TRUE and Statement – 2 is FALSE

Quiz

Year 2024

January
Week # 4 Quiz 2

Q1. A 3-phase inverter delivers power to a resistive load from a DC source '\(V_s\) '. For star connected load of 'R' \(\Omega\) per phase, the RMS value of load current (\(I_{or}\) ) for 180 degree conduction mode is _________.

Q2. A six pulse thyristor rectifier bridge is connected to a balanced 50 Hz three phase ac source. Assuming that the DC output current of the rectifier is constant. The lowest frequency harmonics component of the ac source line current is

Q3. Single phase full converter can operate in

Q4. The purpose of freewheeling diode in a convertor circuit is:

Q5. In an SCR

Q6. The selection of rectifier diode mostly depends on the

Q7. Which chopper circuit operates in all the 4 quadrants?

Q8. Two equal voltages of same frequency applied to the X and Y plates of a CRO, produce a circle on the screen. The phase difference between the two voltages is

Q9. A wheatstone bridge can not be used for precision measurements because errors are introduced into on account of

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

January Week # 4 Quiz 2

Q1. A 3-phase inverter delivers power to a resistive load from a DC source '\(V_s\) '. For star connected load of 'R' \(\Omega\) per phase, the RMS value of load current (\(I_{or}\) ) for 180 degree conduction mode is _________.

Q2. A six pulse thyristor rectifier bridge is connected to a balanced 50 Hz three phase ac source. Assuming that the DC output current of the rectifier is constant. The lowest frequency harmonics component of the ac source line current is

Q3. Single phase full converter can operate in

Q4. The purpose of freewheeling diode in a convertor circuit is:

Q5. In an SCR

Q6. The selection of rectifier diode mostly depends on the

Q7. Which chopper circuit operates in all the 4 quadrants?

Q8. Two equal voltages of same frequency applied to the X and Y plates of a CRO, produce a circle on the screen. The phase difference between the two voltages is

Q9. A wheatstone bridge can not be used for precision measurements because errors are introduced into on account of

Record & Track Your Performance

January
Week # 4 Quiz 2