Homeelectrical mcqImportant Electrical MCQ Important Electrical MCQ Education March 22, 2023 0 1➤ As per Barkhausen criterion for oscillation, the magnitude of the loop gain βA must be: Equal to 1 Less than 1Greater than 1Equal to 1.52➤ Transient stability of a power system can be improved by reducing transfer reactance of the systemusing high speed excitationby increasing system voltage all the above3➤ or stability and economic reasons transmission lines are operated with the power angle in the range- A. B. C. D. 60° to 75° 30° to 45° 10° to 25°65° to 80°4➤ he pinch off voltage for a n-channel JFET is 4 V, when VGS = 1V, the pinch-off occurs at VDS equal to: 4 V5V3V1 V5➤ Which of the following statement is incorrect regarding MOSFET? MOSFET has lower switching losses but higher conduction lossesMOSFET is a voltage controlled deviceMOSFET has positive temperature coefficient of resistanceSecondary breakdown occurs in MOSFET6➤ Which of the following logic gates can be used to implement the functionality of any logic gate? XNORXORNANDAND7➤ Why an IGBT is also referred as a bipolar-mode MOSFET? It comprises of two stable modes of operationIt is a combination of both types of MOSFET, enhancement type and depletion typeIt is a combination of BJT and MOSFETAll of the above8➤ If the length of a cable is doubled, its capacitance Becomes one-halfBecomes doubleBecomes one-fourth Remains unchanged9➤ Electric flux , is a ______ field, and its density D, is a ______field. Scalar and vectorVector and scalarScalar and scalar Vector and vector10➤ Which of the following type of measuring instruments is used in the measurement of ac quantity only? Repulsion moving-iron typePermanent-magnet moving coil typeSplit-phase induction typeHot-wire type11➤ The demand of average load to maximum demand in power system is defined as:. Load factorUtilization factorDemand factorAverage load12➤ Marginally stable systems have closed loop transfer functions with only imaginary axis poles of multiplicity:432113➤ RTD stands for: Resistance Transfer DeflectorResistance Temperature DeflectorResistance Temperature DetectorResistance Transfer Detector14➤ Which of following devices exhibits negative resistance region?Tunnel diodeZener diode P-N junction diodeBJT15➤ 10 V power supply would use filter capacitor of following type: Electrolytic capacitorPaper capacitorAir capacitorMica capacitor16➤ Which of the following is not true with respect to dielectric strength? . It decreases with increase in humidity It increases with increase in frequency. It decreases with increase in operating temperature It decreases with increase in frequency17➤ The transformer utilisation factor of a full wave rectifier is: 0.3690.9360.6930.518➤ For a load bus of a power system, the specified quantities are: the bus voltage magnitude and its phase anglethe real reactive of power and its phase anglethe reactive component of power and its phase anglethe real and reactive components of power19➤ A cycloconverter is a __________frequency changer. four-stagetwo-stageone-stagethree-stage20➤ Cycloconverters used in aircraft power supplies provide ___________ frequency power from a _______ input frequency power. variable; variablefixed; variablevariable; fixedfixed; fixed SubmitYour score is Tags electrical mcq Newer Older