0% 0 Electrical Engineering Quiz 3 1 / 50 With the increase in temperature, the speed of DC shunt motor____________? increases decreases. remain same none of the above 2 / 50 The cost of an induction motor will increase as________________? horsepower rating decreases but r.p.m. increases horsepower rating increases but r.p.m. decreases horsepower rating and operating speed increases horsepower rating and operating speed decreases 3 / 50 If free space between the plates of a capacitor is replaced by a dielectric_____________? The potential difference remains constant capacittance and energy stored increases The potential difference decreases but both capacitance and energy increase both potential difference and capacitance decrease but energy increases The potential difference remains constant capacittance decreases and energy increases 4 / 50 The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________? 1sec 1.5Hzs 106sec 1Hzs 5 / 50 In superhetrodyne receiver, the input at mixer stage is________________? IF and RF RF and AF RF and local oscillator signal IF and AF 6 / 50 Power amplifiers handle ______________ signals compare to voltage amplifiers? None of the above Very small Large Small 7 / 50 The maximum efficiency of transformer coupled class A power amplifier is _______________? 80% 45% 50% 30% 8 / 50 Following will happen if the specific gravity of electrolyte becomes more than 1.23 Loss of life All above Corrosion of the grids of the plate Loss of capacity 9 / 50 Which instrument is used to measure the power of electric circuit ? Wavemeter Wattmeter Viscometer None of these 10 / 50 In Thevenin?s theorem, to find Z all independent voltage and current sources are short circuited all independent current sources are short circuited and independent voltage sources are open circuited all independent voltage sources are open circuited and all independent current sources are short circuited all independent voltage sources are short circuited and all independent current sources are open circuited 11 / 50 Primary air is that air which is used to_____________? increase the flame length reduce the flame length provide air around burners for get?ting optimum combustion transport and dry the coal 12 / 50 A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____? 30? to 150?. 60? to 120?. 30? to 180?. 60? to 180?. 13 / 50 The force between two long parallel conductors is inversely proportional to_____________? radius of conductors product of current in two conductors distance between the conductors current in one conductor 14 / 50 Annual depreciation cost is calculated by___________? sinking fund method All none of the above straight line method 15 / 50 When secondary of a current transformer is open-circuited its iron core will be__________? none of above will happen cool as there is no secondary current hot because of heavy iron losses taking place in it due to high flux density hot because primary will carry heavy current 16 / 50 A voltmeter should have ____________resistance? None of the above Zero Very high Very low 17 / 50 In a boiler installation the natural draught is produced_____________? due to the fact that at the chimney top the pressure is more than its environmental pressure all of the above due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column 18 / 50 At parallel resonance, the net reactive component circuit current is _______________? Capacitive Zero Inductive None of the above 19 / 50 Which of the following primary cells has the lowest voltage_________ ? Carbon-zinc Mercury Lithium Zinc-chloride 20 / 50 The substances which combine together to store electrical energy during the charge are called ________ materials active dielectric inert passive 21 / 50 A crystal diode utilises ?????.. characteristic for rectification none of the above reverse forward forward or reverse 22 / 50 A feeder, in a transmission system, feeds power to________________? generating stations distributors all of the above service mains 23 / 50 Annual depreciation as per straight line method, is calculated by__________? increasing a uniform sum of money per annum at stipulated rate of interest the capital cost divided by number of year of life none of the above the capital cost minus the salvage value, is divided by the number of years of life 24 / 50 An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db? 8 db 5 db 6 db 4 db 25 / 50 In a three-phase mercury arc rectifiers each anode conducts for____________? two-third of a cycle one-half a cycle one-third of a cycle one-fourth of a cycle 26 / 50 In three-phase squirrel-cage induction motors____________? rotor conductors are kept open rotor conductors are connected to insulation rotor conductors are short-circuited through end rings rotor conductor ends are short-circuited through slip rings 27 / 50 The armature of D.C. generator is laminated to_______________? reduce the bulk provide the bulk insulate the core reduce eddy current loss 28 / 50 Copper oxide rectifier is usually designed not to operate above___________? 45?C 10?C 20?C 30?C 29 / 50 A forward biased pn junction diode has a resistance of the order of_____________? kO None of the above MO O 30 / 50 The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ______________? 1000:01:00 1:01 40,000 : 1 100:01:00 31 / 50 If the supply frequency to the transformer is increased,?the iron loss will__________? decrease not change any of the above increase 32 / 50 The efficiency of a machine should be as ____________ as possible to reduce the operating cost? either of the above low none of the above high 33 / 50 Load factor of a power station is defined as____________? average load/maximum demand average load x maximum demand none of the above maximum demand/average load 34 / 50 The purpose of capacitors in a transistor amplifier is to___________________? Cool the transistor Protect the transistor Couple or bypass a.c. component Provide biasing 35 / 50 The thickness of metallic shielding on cables is usually_______________? 0.04 mm 40 to 60 mm None 0.2 to 0.4 mm 36 / 50 Automatic signalling is used for which of the following trains ? Mail and express trains All trains Superfast trains Suburban and Urban electric trains 37 / 50 The starting torque in case of centrifugal pumps is generally_________________? less than running torque slightly more than running torque same as running torque double the running torque 38 / 50 Static capacitors are rated in terms of_____________? kWh kVAR none of the above kW 39 / 50 One maxwell is equal to____________? 10 webers 10 webers 10 webers 10 webers 40 / 50 For the safety of a steam boiler the number of safety valves fitted are____________? three four one two 41 / 50 The value of VBE ___________________? Is almost independent of IC Is strongly dependant on IC Depends upon IC to moderate extent None of the above 42 / 50 During reverse recovery time__________________? charge carrier of junction J2 recombined charge carrier of junction J3 is swept out both B and C charge carrier of junction J1 is swept out 43 / 50 Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ? Poor commutation Increased I R losses All of the above Increased core losses 44 / 50 An induction motor is identical to_________? synchronous motor D.C. series motor asynchronous motor D.C. compound motor 45 / 50 The voltage gain in a transistor connected in___________arrangement is the highest? none of the above common emitter common collector common base 46 / 50 By which of the following methods the temperature rise of windings and other parts may be determined ? Resistance method Embedded temperature detector method Thermometer method Any of the above 47 / 50 Maximum demand on a power plant is_________________? All instantaneous maximum value of kVA supplied during a period the greatest of all ?short time interval averaged? demand during a period none of the above 48 / 50 The direction of electric field due +0 positive charge is ___________? none of the above All towards the charge away from the charge 49 / 50 Admittance relay is __________ relay? non-directional none of the above directional impedance 50 / 50 In case of a steam engine an average coal consumption per km is nearly________________? 28 to 30 kg 60 to 80 kg 100 to 120 kg 150 to 175 kg 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 2 Electrical Engineering Quiz 4Next
