0% 0 Electrical Engineering Quiz 50 1 / 50 For which of the following locomotives the maintenance requirements are the least ? Equal in all of the above Steam locomotives Electric locomotives Diesel locomotives 2 / 50 Dielectric strength of a medium is usually expressed in____________? kV/mm N/mm C/m2 J/mm 3 / 50 The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________? 2.36% 4.76% 6.77% 8.84% 4 / 50 The range of efficiency for shaded pole motors is______________? 80% to 90% 50% to 75% 5% to 35% 95% to 99% 5 / 50 According to Fleming?s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________? motion of conductor lines of force none of the above either of the above 6 / 50 The e.m.f. of an Edison cell, when fully charged, is nearly______________? 1.4 V 0.9 V 0.8 V 1 V 7 / 50 The voltage control in electric supply networks in required on account of which of the following reasons ? All of the above Adjustment of short period daily and seasonal voltage variations in accordance with variations of load Adjustment of voltage at consumers premises within statutory limits Control of active and reactive power 8 / 50 The Graetz bridge makes excellent use of ______________? Power transformer SCR Potential transformer Current transformer 9 / 50 Welding generator will have____________? wave winding delta winding duplex wave winding lap winding 10 / 50 If the value of collector current IC increases, then the value of VCE ______________? Increases Remains the same None of the above Decreases 11 / 50 Mica capacitors are characterized by all of the following except___________? low leakage reactance accurate value stable operation low losses 12 / 50 Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because_____________? it is comparatively cheaper it has low starting as well as running currents at relatively high power factor it is quiet in operation it has almost non-destructible capacitor 13 / 50 In RC coupling, the value of coupling capacitor is about_______________? 0.01 ?F 10 ?F 0.1 ?F 100 pF 14 / 50 Which of the following is disadvantage of fast recovery diodes? None of these Recovery is only 5 ?s Recovery is only 50 ?s Doping is carried out 15 / 50 In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________? decreases with increase in Rankine cycle efficiency increases with increase in Rankine cycle efficiency none of the above is unaffected by increase in Rankine cycle efficiency 16 / 50 The r.m.s. value of pure cosine function is_________? same as peak value zero 0.707 of peak value 0.5 of peak value 17 / 50 The function of breather in a transformer is___________? to cool the coils during reduced load to cool the transformer oil to arrest flow of moisture when outside air enters the transformer to provide oxygen inside the tank 18 / 50 ICs are generally made of ________________? Copper None of the above Silicon Germanium 19 / 50 The battery connections required to forward bias a pn junction are_________________? #NAME? #NAME? #NAME? None of the above 20 / 50 A mercury arc rectifier possesses __________ regulation characteristics curved line none of the above straight line exponential 21 / 50 Two multimeters A and B have sensitivities of 10 kO/V and 30 kO/V respectively. Then ______________? Multimeter B is more sensitive None of the above Multimeter A is more sensitive Both are equally sensitive 22 / 50 Rankine cycle efficiency of a good steam power plant may be in the range of____________? 70 to 80 per cent 35 to 45 per cent 90 to 95 per ceut 15 to 20 per cent 23 / 50 The high voltage winding is usually which of the following type ? Continuous disc type winding with rectangular conductors Cross-over winding with either circular or small rectangular conductors Cylindrical winding with circular conductors All of the above types 24 / 50 Between the branch voltages of a loop the Kirchhoff s voltage law imposes_____________? non-linear constraints linear constraints none of the above no constraints 25 / 50 Thyristor can be protected from over voltages by using____________? heat sink. snubber circuit. voltage clamping device. fuse. 26 / 50 In a flyback converter, the inductor of the buck-boost converter has been replaced by a_____________? Flyback transformer Flyback transistor Flyback capacitor Flyback resistor 27 / 50 The r.m.s. value and mean value is the same in the case of___________? square wave sine wave half wave rectified sine wave triangular wave 28 / 50 Star/star transformers work satisfactorily when________________? load is unbalanced only on balanced as well as unbalanced loads none of the above load is balanced only 29 / 50 The maximum load that a power transformer can carry is limited by its________________? temperature rise copper loss dielectric strength of oil voltage ratio 30 / 50 A power semiconductor may undergo damage due to____________? High dv/dt Low dv/dt High di/dt Low di/dt 31 / 50 Capacitance grading of cable implies__________? capacitance required to be introduced at different lengths to counter the effect of inductance cables using single dielectric in different concentrations grading according to capacitance of cables per km length use of dielectrics of different permeabilities 32 / 50 Out of the following capacitors of identical rating which one will have the smallest dimensions ___________ ? Paper capacitor Aluminium foil capacitor Mica capacitor Ceramic capacitor 33 / 50 A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________? 0.48 N-m 8 N-m 0.0048 N-m 0.048 N-m 34 / 50 The double energy transient occur in the____________? purely inductive circuit R-C circuit R-L-C circuit R-L circuit 35 / 50 Specific energy consumption is affected by which of the following factors ? Retardation and acceleration values Distance between stops All of the above Gradient 36 / 50 Which of the following methods may be adopted to reduce the effects of armature reaction ? All of the above Increase in length of air gap at pole tips Increasing reluctance of pole tips Compensating windings 37 / 50 The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ? Radiation Conduction All of the above Convection 38 / 50 ?Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load?. The above statement is associated with____________? Millman?s theorem Thevenin?s theorem Superposition theorem Maximum power transfer theorem 39 / 50 With direct water cooling it is possible to have ratings of about_____________? 400 MW 200 MW 600 MW 300 MW 40 / 50 The resistivity of water should not be less than_____________? 2000 Q m 1000 Q m 100 Q m 10 Q m 41 / 50 Galvanised steel wire is generally used as______________? structural components earth wire all of the above stay wire 42 / 50 In voltage divider bias, operating point is 3 V, 2 m If VCC = 9 V, RC = 2.2 kO, what is the value of RE ? 1400 O 1600 O 800 O 2000 O 43 / 50 If the collector supply is 10V, then collector cut off voltage under d.c. conditions is _______________? 2 V 5 V 10 V 20 V 44 / 50 Solid type cables are considered unreliable beyond 66 kV because___________? of corona loss between conductor and sheath material skin effect dominates on the conductor insulation may melt due to higher temperature there is a danger of breakdown of insulation due to the presence of voids 45 / 50 Laminations of core are generally made of________________? carbon silicon steel case iron stainless steel 46 / 50 What happen due to high di / dt____________? Insulation failure None of these Breakdown of junction Local hot spot 47 / 50 In a cable, the maximum stress under operating conditions is at___________? insulation layer sheath armour conductor surface 48 / 50 1 angstrom is equal to______________? 10-8 mm 10?6 cm 10?10 m 10~14 m 49 / 50 The noise produced by a transformer is termed as_______________________? zoom ringing hum buzz 50 / 50 The current due to electron flow in conduction band is the hole current in valence band? equal to greater than any of the above less than 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 49 Electrical Engineering Quiz 51Next
