Homemost Important Electrical MCQMost useful MCQ Most useful MCQ Education March 23, 2023 0 1➤ Injection of VARs is required to Increases the voltage at the receiving endget a good voltage profile.compensate for line lossesNone2➤ Switching operations on the transmission line have severe impact on- dynamic-state stabilitysteady-state stability transient-state stabilityNone of the above3➤ Ten times change in frequency is known as: GainCut-off frequencyDecibelDecade4➤ What is Eureka? It is an alloy of nickel and chromium.It is an alloy of nickel, chromium and aluminiumIt is an alloy of iron, chromium and aluminium. It is an alloy of nickel and copper5➤ Which one of the following is a part of the tower that is buried under the ground? Anchor BracesStrut inclined supportGuy wire6➤ What are the components of a digital multimeter? An attenuator, an ADC, a display and a recording mechanismA comparator and a pulse generatorAn attenuator, a rectifier and a filterA PLL and a counter7➤ ______is measure of closeness in shape between a waveform and its fundamental component. Harmonic factor Distortion factorTotal harmonic distortion Lowest order harmonics 8➤ What is the short circuit current of an alternator dependent on, if a line to line fault occurs? Synchronous reactanceShort circuit resistanceTransient reactanceInductive reactance 9➤ What is the internal voltage drop in an ideal constant-voltage source? Variable01Very high10➤ What is the recommended width of right of way (ROW) for the transmission line of 33 kV? 15meters 52 meters25meters18 meters11➤ What is the recommended width of right of way (ROW) for the transmission line of 400 kV? 46meters40 meters52 meters35 meters12➤ What is the recommended width of right of way (ROW) for the transmission line of 110 kV? 23 meters52 meters22meters35 meters13➤ What happens to the terminal voltage when an alternator is connected to an infinite bus bar and its excitation is gradually increased? The terminal voltage will dropThe terminal voltage will riseThe terminal voltage will remain unalteredThe terminal voltage will vary rapidly 14➤ How much of energy is required for refining gold? 300 to 350 kWh/ton100 to 150 kWh/ton 250 to 350 kWh/ton400 to 550 kWh/ton15➤ Which of the following is usually not the generating voltage? 11 kV6.6 kV9.9 kV13.2 kV16➤ In a thermal power plant, Economiser is use to heatFeed WaterAirFlue GasesCoal17➤ Series reactors are used to - bring down the fault level within the capacity of switchgearimprove the transmission efficiencyimprove voltage regulationimprove the P.F18➤ Which of the following function is not performed by a transformer? Transfer electric energy by electromagnetic induction Transfer electric energy from one circuit to anotherTransfer electric energy where two electric circuit are in mutual inductive influence of each otherTransfer electric energy with a change of frequency19➤ The ratio of rotor copper loss with rotor output is: s/(1 –s)(1 – s) 1/sS20➤ The amount of electrical energy stored for every kilogram of battery mass is defined as energy densityspecific energyself-discharge ratesspecific power21➤ Which of the following is NOT a part of automatic control systems? ATransformer systemThe fluid to be controlled A sensor for the process variablecontroller which affects the actuator22➤ ___ are used in control systems to attain the mechanical matching of the motor to the load.Synchros DC servomotorsStepper motorsGear trains23➤ In simple Series RLC' circuit. ______ corresponds to infinite capacitance C = ∞ and zero inductance L= 0. Purely inductive circuitPurely resistive circuit RLC' Series CircuitPurely capacitive Circuit24➤ In _____ the susceptibility will decrease with increase in temperature and they have relatively small susceptibility all temperatures.. Ferromagnetic materialsSuperparamagnetic materials Ferrimagnetic materialsAnti ferromagnetic materials25➤ ____ possess NO free-charge carriers and thus are non-conductive. ConductorsSemiconductorsSaltsInsulators26➤ _____ has the property of storing potential energy springdamperMassFriction27➤ A register capable of incrementing and/or decrementing its contents. DecoderCounterMultiplexerDemultiplexer28➤ The difference between the tooth space and tooth width in mechanical systems which is essential for rapid working gear transmission is known as ____ backlashrelaydead zonefriction29➤ Fermi energy level for n-type extrinsic semiconductors lies ____ None of these optionsclose to the conduction bandin the middle of the band gapclose to the valence band30➤ The systems which control the motion of electrical machines are known as ____ electrical motorselectric heating electrical driveselectroforming SubmitYour score is Tags most Important Electrical MCQ Newer Older