Electrical Engineering MCQs

Page No. 354

The output power of the cascaded amplifier / attenuator system can be determined using___________?


aActual gain of amplifier


bActual gain of amplifier and attenuator


cGain in dB of amplifier and attenuator


dActual gain of attenuator



If the gate voltage of an SCR is removed, then the_______________?


aanode current decreases


b anode current does not decrease at all


canode current increases


dcathode current increases



Anode of an operational SCR is _______________?


a Always positive w.r.t cathode


bAlways negative w.r.t anode


cAlways positive w.r.t anode


dAlways negative w.r.t cathode



An SCR is made up of silicon because?


asilicon has large leakage current than germanium


b silicon has small leakage current than germanium


csilicon has small leakage voltage than germanium


dsilicon has large leakage voltage than germanium



In a silicon controlled rectifier, the load is connected___________?


aAcross anode


bIn series with anode


cAcross cathode


dIn series with cathode



Number of PN junction in an SCR is____________?


aTwo


bThree


cFour


dFive


View Answer Three

The switching function of semiconductor devices can be characterized with___________?


aDuty ratio only


b Frequency only


cDuty ratio and frequency


dDuty ratio, frequency and time delay



IGBT stands for___________?


aInsulated gate bipolar transistor


b. Insulated gate bidirectional transistor


cInductive gate bipolar transistor


d Inductive gate bidirectional transistor



Electrical power output in a d.c. generator is equal to____________?


aElectrical power developed in armature – copper losses


bMechanical power input – iron and friction losses


cElectrical power developed in armature – iron and copper losses


d Mechanical power input – iron and friction losses – copper losses



An ideal switch is___________?


a Lossless


bCarry current in any direction when it is on


cDoes not carry any current in any direction when it is off


dAll of these


View Answer All of these

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