0% 0 Electrical Engineering Quiz 59 1 / 50 Which of the following circuit elements will oppose the change in circuit current ? Capacitance Inductance All of the above Resistance 2 / 50 In a load curve the highest point represents______________? diversified demand peak demand average demand none of the above 3 / 50 A glass rod when rubbed with silk cloth is charged because__________? its atoms are removed it gives away electrons it takes in proton it gives away positive charge 4 / 50 The design of mechanical parts is particularly important in case of __________ speed machines? medium low any of the above high 5 / 50 A VTVM has_____________input resistance than that of a multi meter? More Same Less None of the above 6 / 50 Materials exhibiting zero value of resistivity are known as ____________ ? superconductors conductors insulators semiconductors 7 / 50 Which of the following single-phase motors is suitable for timing and control purposes ? Series motor Repulsion motor Reluctance motor Universal motor 8 / 50 A 12 k? resistor, a 15 k? resistor, and a 22 k? resistor are in series with two 10 k? resistors that are in parallel. The source voltage is 75 V. Current through the 15 k? resistor is approximately___________? 50 mA 1.4 mA 14 mA 5 mA 9 / 50 The loads on distributors systems are generally__________________? either of the above unbalanced balanced none of the above 10 / 50 A conductor carries 125 amperes of current under 60? to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________? 480 N 50 N 240 N 120 N 11 / 50 A 10 V power supply would use ____________ as filter capacitor? electrolytic capacitor mica capacitor paper capacitor air capacitor 12 / 50 In the case of an unsymmetrical alternating current the average value must always be taken over__________? unsymmetrical part of the wave form the half cycle the quarter cycle the whole cycle 13 / 50 Compared to transistor, _________ have lower on state conduction losses and higher power handling capability? Thyristor Semi conductor diodes TRIACs MOSFETs 14 / 50 In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______? Only (a) and (b) Result in net current flow component into the base Contribute to the collector current Do not contribute to the collector current 15 / 50 The arc voltage produced in A.C. circuit breaker is always_____________? none of the above lagging the arc current by 90? leading the arc current by 90? in phase with the arc current 16 / 50 Which of the following insulation is used in cables ? Varnished cambric Paper Any of the above Rubber 17 / 50 The purpose of providing iron core in a step-up transformer is? to increase the magnitude of mutual flux to provide all above features to provide coupling between primary and secondary to decrease the magnitude of mag-netizing current 18 / 50 The purpose of using short-circuit gear is___________? none of the above to short circuit the rotor at slip rings to short circuit the starting resistances in the starter to short circuit the stator phase of motor to form star 19 / 50 The capacity of a crane is expressed in terms of_______________? any of the above span type of drive tonnes 20 / 50 ___________________has least range of speed control? D.C. shunt motor Synchronous motor Slip ring induction motor Schrage motor 21 / 50 The commonly used material for shielding or screening magnetism is____________? aluminium soft iron brass copper 22 / 50 Double tuned circuits are used in ____________ stages of a radio receiver? None of the above Audio IF Output 23 / 50 Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________? 267.5 V 265 V 270 V 257.4 V 24 / 50 Leakage current flows through the thyristor in_________? forward conduction mode reverse blocking mode both forward and reverse blocking mode forward blocking mode 25 / 50 In a three-phase induction motor__________? power factor at starting is high as compared to that while running None power factor at starting in the same as that while running power factor at starting is low as compared to that while running 26 / 50 Which of the following, in a thermal power plant, is not a fixed cost? Insurance charges Depreciation Interest on capital Fuel cost 27 / 50 Light duty cranes are used in which of the following ? Automobile workshops All of the above Pumping stations Power houses 28 / 50 In an RC coupling scheme, the coupling capacitor CC must be large enough______________? To pass d.c. between the stages To dissipate high power Not to attenuate the low frequencies None of the above 29 / 50 If the input capacitor of a transistor amplifier is short-circuited, then_________________? Transistor will be destroyed None of the above Signal will not reach the base Biasing conditions will change 30 / 50 A thyristor is basically________? A combination of diac and triac A set of SCRs A set if SCR,diac and triac PNPN device 31 / 50 In a D.C. generator:___________________? external resistance = internal char-acteristic ? armature reaction internal characteristic = magnetisation characteristic ? ohmic drop magnetisation characteristic = external characteristic external characteristic = magnetisation characteristic ? ohmic drop ? armature reaction 32 / 50 In a transistor, the base current is about_________of emitter current? 20% 5% 25% 35% 33 / 50 In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____________? 90? 120? 60? 0? 34 / 50 A transistor behaves as a linear device for _____________? None of the above Both small and large signals Small signals only Large signals only 35 / 50 In an RC coupled amplifier, the voltage gain over mid-frequency range_____________? Changes abruptly with frequency Is constant None of the above Changes uniformly with frequency 36 / 50 The power factor of a D.C. circuit is always__________? zero greater than unity less than unity unity 37 / 50 Which of the following should be used for extinguishing electrical fires? Foam type fire extinguisher Water CO2 fire extinguisher Carbon tetrachloride fire extinguisher 38 / 50 Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________? 60 mA 135 mA 31.25 mA 15 mA 39 / 50 A cable carrying alternating current has__________? hysteresis, leakage and copper losses only hysteresis and leakage losses only hysteresis losses only hysteresis, leakage, copper and friction losses 40 / 50 Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________? 137 mA 2.2 A 9.09 A 1.8 A 41 / 50 At _______ frequencies the parallel R-L circuit behaves as purely resistive high very high very low low 42 / 50 Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron? decreases increases does not change None 43 / 50 The chemical used in breather for transformer should have the quality of____________? cooling the transformer oil ionizing air absorbing moisture cleansing the transformer oil 44 / 50 If two charges are increased by two times then force_____________? Decreases 9 times Decreases 4 times Increases 9 times Increases 4 times 45 / 50 For constant torque drive which speed control method is preferred ? Mechanical loading system Shunt armature control Field control Armature voltage control 46 / 50 Which of the following is the non-linearity caused by servomotor ? None of the above Saturation Static friction Backlash 47 / 50 In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________? out of phase by 90? out of phase by 0? out of phase by 60? out of phase by 30? 48 / 50 The transient currents are associated with the____________? impedance of the circuit resistance of the circuit changes in the stored energy in the inductors and capacitors applied voltage to the circuit 49 / 50 Which of the following is a bilateral element? Constant voltage source None of the above Capacitance Constant current source 50 / 50 An ammeter should have_____________ resistance? None of the above Very low Very large Infinite 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 58 Electrical Engineering Quiz 60Next
