NET, IAS, State-SET (KSET, WBSET, MPSET, etc.), GATE, CUET, Olympiads etc.: Electronics MCQs (Practice_Test 12 of 13)
Get top class preparation for competitive exams right from your home: get questions, notes, tests, video lectures and more- for all subjects of your exam.
- “Six MOSFETs connected in a bridge configuration (having no other power device) MUST be operated as a Voltage Source Inverter (VSI) ” This statement is [GATE-2007]
- True, because being majority carrier devices, MOSFETs are voltage driven
- True, because MOSFETs have inherently anti parallel diodes
- False, because it can be operated both as current source Inverter (CSI) or a VSI
- False, because MOSFETs can be operated as excellent constant current sources in the saturation region
- Answer: d
- A single phase full-wave half controlled bridge converter feeds an inductive load. The two SCRs in the converter are connected to a common DC bus. The converter has to have a free wheeling diode [GATE-2007]
- because the converter inherently does not provide for free wheeling
- Because the converter does not provide for free wheeling for high values of triggering angles
- Or else the free wheeling action of the converter will cause shorting of the AC supply
- Or else if a gate pulse to one of the SCRs is missed, it will subsequently cause a high load current in the other SCR
- Answer: b
- The power electronic converter shown in the figure has a single pole double throw switch.
- The pole P of the switch is connected alternately to throws A and B. The converter shown is a [GATE-2010]
- 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 a firing angle of 60° assuming continuous conduction? [GATE-2010]