0% 0 Electrical Engineering Quiz 4 1 / 50 At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is_____________? -6.02 dB 12.04 dB -12.04 dB 6.02 dB 2 / 50 Fleming?s left hand rule is used to find_________________? direction of flux in a solenoid polarity of a magnetic pole direction of force on a current carrying conductor in a magnetic field direction of magnetic field due to current carrying conductor 3 / 50 When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________? 6 joules 4 joules 2 joules 8 joules 4 / 50 Transmission voltage of 11 kV is normally used for distances up to_____km? 20?25 km 80?100 km 40?50 km 60?70 km 5 / 50 Short circuit test on transformers is conducted to determine____________? copper losses core losses eddy current losses hysteresis losses 6 / 50 Hysteresis is desirable in Schmitt-trigger, because______________? Energy is to be stored/discharged in parasitic capacitances Effects of temperature would be compensated Devices in the circuit should be allowed time for saturation and desaturation It would prevent noise from causing false triggering 7 / 50 Pressure error can be measured by which of the following ? Selsyn Differential bellows and straingauge Strain gauge and potentiometer Strain gauge 8 / 50 In a mercury arc rectifier positive ions are attracted towards______________? cathode anode mercury pool shell bottom 9 / 50 In heating the ferromagnetic material by induction heating, heat is produced due to_____________? induced current flow through the charge hysteresis loss taking place below curie temperature none of the above factors due to hysteresis loss as well as eddy current loss takingplace in the charge 10 / 50 Which of the following is measured by using a vector voltmeter ? Filler transfer functions Amplifier gain and phase shift All of the above Complex insersion loss 11 / 50 The operation of a D.C. machine with large air gap lengths is comparatively_____________? none of the above noisy either of the above quiet 12 / 50 The speed of a synchronous motor: decreases as the load decreases always remains constant none of the above increases as the load increases 13 / 50 Salvage value of the plant is always____________? positive zero any of the above negative 14 / 50 The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________? Avoid voltage gain drop Reduce noise in the amplifier Forward bias the emitter None of the above 15 / 50 In which of the following applications the load on motor changes in cyclic order ? Electric shovels All of the above Cranes Rolling mills 16 / 50 A thyristor can termed as__________? DC switch AC switch Square wave switch Both a and B 17 / 50 The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________? Not related to their harmonic order None of these Directly proportional to their harmonic order Inversely proportional to their harmonic order 18 / 50 A synchronous motor can operate at____________? unity power factor only lagging power factor only lagging, leading and unity power factors leading power factor only 19 / 50 For measurement of mutual inductance we can use________________? Maxwell?s bridge Heaviside bridge Any of the above Anderson bridge 20 / 50 If an inductance is connected in one arm of bridge and resistances in the remaining three arms____________? the bridge cannot be balanced the bridge can always be balanced the bridge can be balanced if the resistances have some specific values None 21 / 50 Electrolyte used in a lead-acid cell is__________? NaOH dilute H2SO4 only water onlyH2S04 22 / 50 In an Anderson bridge, the unknown inductance is measured in terms of_______________? known inductance and resistance known inductance known resistance known capacitance and resistance 23 / 50 Machines cooled by direct cooling method may be called_____________? any of the above ?conductor cooled? ?inner cooled? ?supercharged? 24 / 50 _________________cannot be fabricated on an IC? Resistors Diodes Transistors Large inductors and transformers 25 / 50 Magnetic circuit breaker has ___________ trip action instantaneous both of the above none of the above delayed 26 / 50 Which of the following materials is not used for transmission and distribution of electrical power________________? Steel Copper Aluminium Tungsten 27 / 50 An important limitation of a crystal oscillator is____________? Its low output Its high Q Less availability of quartz crystal Its high output 28 / 50 A load curve indicates___________? average power used during the period average kWh (kW) energy consumption during the period none of the above either of the above 29 / 50 In the transformer following winding has got more cross-sectional area______________? Secondary winding Primary winding Low voltage winding High voltage winding 30 / 50 For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used? 3.2 to 4.2 A/mm2 2.2 to 3.2 A/mm2 1.5 to 2.0 A/mm2 1.0 to 1.2 A/mm2 31 / 50 In ac ? dc conversion, when the switch is closed then the sum of voltages around the loop is____________? Twice of the voltage when switch is open Zero Equal to the sum of voltage when switch is open Non zero 32 / 50 Zener diode can be used as__________________? none of the above voltage regulator only voltage regulator only both D.C and A.C voltage regulator 33 / 50 The value of exciting or magnetizing current depends upon which of the following factors ? Total m.m.f. required All of the above The way in which the winding is distributed The number of turns in the exciting winding 34 / 50 The most commonly used transistor arrangement is____________arrangement? common emitter common base none of the above common collector 35 / 50 Kirchhoffs current law is applicable to only electronic circuits junction in a network electric circuits closed loops in a network 36 / 50 A JFET has three terminals, namely________________? source, gate, drain none of the above cathode, anode, grid emitter, base, collector 37 / 50 The density of hydrogen is __________ times the density of air? 0.07 1.5 3.5 2.5 38 / 50 A reverse bias pn junction has_____________? Very narrow depletion layer Large current flow Very low resistance Almost no current 39 / 50 The efficiency of the copper oxide rectifier seldom exceeds____________? 90 to 95% 80 to 85% 85 to 90% 65 to 75% 40 / 50 A linear resistor having 0 < R < ?o is a______________? none of the above voltage controlled resistor current controlled resistor both current controlled and voltage controlled resistor 41 / 50 Resistance grounding is used for voltage between_________________? 3.3kVandllkV none of the above HkVto33kV 33kVto66kV 42 / 50 Empire tape is__________? impregnated paper varnished cambric none of the above vulcanised rubber 43 / 50 With zero volts on both inputs, an OP-amp ideally should have an output _______________? equal to CMRR equal to the positive supply voltage equal to zero equal to the negative supply voltage 44 / 50 The total resistance of a parallel circuit is 50 ?. If the total current is 120 mA, the current through the 270 ? that makes up part of the parallel circuit is approximately_______________? 120 mA 220 mA 22 mA 50 mA 45 / 50 The direction of rotation of a D.C. series motor can be changed by___________? interchanging supply terminals All None of the above interchanging field terminals 46 / 50 Transformer breaths in when_______________? load on it increases load remains constant none of the above load on it decreases 47 / 50 A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________? controlling deflecting damping any of the above 48 / 50 Which of the following devices are commonly used as error detectors in instruments ? Vernistats Resolvers Any of the above Microsyns 49 / 50 A 1,000 V power supply would use_____________ as a filter capacitor? mica capacitor air capacitor electrolytic capacitor paper capacitor 50 / 50 In a domestic cake baking oven the temperature is controlled by________________? series-parallel operation thermostat auto-transformer voltage variation Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevElectrical Engineering Quiz 3 Electrical Engineering Quiz 5Next
