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

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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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