0% 0 Electrical Engineering Quiz 2 1 / 50 If the firing angle becomes negative, then the rectifier begins to work as_______________? A chopper An inverter A regulator A rectifier 2 / 50 During the charging of a lead-acid cell__________? its voltage increases it gives out energy specific gravity of H2SO4 decreases its cathode becomes dark chocolate brown in colour 3 / 50 In a capacitor, the electric charge is stored in_________? metal plates dielectric none of the above dielectric as well as metal plates 4 / 50 A cumulatively compounded long shunt generator when operating as a motor would be____________? deferentially compounded long shunt cumulatively compounded long shunt differentially compounded short shunt cumulatively compounded short shunt 5 / 50 The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________? 0.5 to 0.8 Wb/m2 1.4 to 1.8 Wb/m2 1.1 to 1.35 Wb/m2 0.8 to 1.0 Wb/m2 6 / 50 Series reactors should have________________? high resistance low resistance high impedance low impedance 7 / 50 In repulsion motor, maximum torque is developed when____________? brush axis coincides with the field axis brush axis is at 90? electrical to the field axis none of the above brush axis is at 45? electrical to the field axis 8 / 50 In a synchronous motor, damper windings are provided on____________? pole faces stator frame none of the above rotor shaft 9 / 50 In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be____________? 750 r.p.m. 3000 r.p.m. none of the above 1500 r.p.m. 10 / 50 _____________is viscoelastic? Glass Rubber Cast-iron Graphite 11 / 50 The magnetising current of a transformer is usually small because it has___________? laminated silicon steel core large leakage flux fewer rotating parts small air gap 12 / 50 In a TRF radio receiver, the RF and detection stages are tuned to______________? Radio frequency Audio frequency IF None of the above 13 / 50 When the initial conditions of a system are specified to be zero it implies that the system is________________? working normally with zero reference input at rest without any energy stored in it at rest but stores energy working normally with reference input 14 / 50 For high efficiency of transfer of power, internal resistance of the source should be____________? none of the above less than the load resistance equal to the load resistance more than the load resistance 15 / 50 Which of the following uses electric energy and does not convert it into any other form ? transformer motor D.C generator A.C generator 16 / 50 Silicon controlled rectifier can be turned on____________? By making current non zero and turned off by making current zero And turned off by applying gate pulse By applying a gate pulse and turned off only when current becomes zero By applying a gate pulse and turned off by removing the gate pulse 17 / 50 The magneto-motive force is______________? the sum of all currents embraced by one line of magnetic field the voltage across the two ends of exciting coil the passage of magnetic field through an exciting coil the flow of an electric current 18 / 50 To protect most of the electrical equipment handling low power, the types of relays used are______________? both (A) and (B) thermocouple none of the above electronic and bimetallic 19 / 50 Over modulation results in ______________? Weakening of the signal Excessive carrier power Distortion None of the above 20 / 50 The forward voltage drop across a silicon diode is about _______________? 10 V 2.5 V 0.7 V 3 V 21 / 50 Two similar 15 V Zeners are connected in series. What is the regulated output voltage ? 30 V 15 V 5 V 45 V 22 / 50 In a radio receiver, we generally use ????.. oscillator as a local oscillator Hartley Phase-shift Crystal Wien-bridge 23 / 50 The good power factor of an induction motor can be achieved if the average flux density in the air gap is___________? small absent infinity large 24 / 50 The motor used for the compressors is____________? d.c. series motor capacitor-start capacitor-run motor shaded pole motor reluctance motor 25 / 50 The effect of considering friction in steam nozzles for the same pressure ratio leads to_________? no change in the quality of exit steam decrease or increase of dryness fraction of exit steam depending upon inlet quality increase in dryness fraction of exit steam decrease in dryness fraction of exit steam 26 / 50 Which of the following is exhibited by Root locus diagrams ? The poles of the transfer function for a set of parameter values The frequency response of a system The bandwidth of the system The response of a system to a step input 27 / 50 A Wien bridge oscillator uses___________feedback? Only negative Both positive and negative Only positive None of the above 28 / 50 The only function of NOT gate is to__________________? Act as a universal gate None of the above Invert input signal Stop signal 29 / 50 The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 m What is the critical value of dv/dt? 1200 V/?s 1000 V/?s 800 V/?s 600 V/?s 30 / 50 The working of a synchronous motor is similar to_____________? distribution transformer turbine gear train arrangement transmission of mechanical power by shaft 31 / 50 The transformer ratings are usually expressed in terms of______________? volts amperes kW kVA 32 / 50 The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth?s atmosphere is known as_______________? irradiation viscous dissipation ablation radiation 33 / 50 The common-mode gain is ________________? unpredictable very low always unity very high 34 / 50 Edward?s air pump____________? removes only air from condenser removes air and also vapour from condenser removes only un-condensed vapour from condenser removes air alongwith vapour and also the condensed water from condenser 35 / 50 The torque of an induction motor is___________? directly proportional to slip inversely proportional to slip proportional to the square of the slip none of the above 36 / 50 The value of the capacitance depends upon the________________? geometry of the capacitor dinsity of the capacitor plates thickness of the capacitor plates voltage applied 37 / 50 In case of a double cage induction motor, the inner cage has__________? low inductance and low resistance high inductance arid low resistance high inductance and high resistance low inductance and high resistance 38 / 50 The ability of charged bodies to exert force on 6ne another is attributed to the existence of____________? electrons protons electric field neutrons 39 / 50 When an input signal 1 is applied to a NOT gate, the output is ______________? None of the above 1 0 Either 0 & 1 40 / 50 Thevenin resistance Rth is found by removing voltage sources along with their internal resistances between any two ?open? terminals between same open terminals as for Etk by short-circuiting the given two terminals 41 / 50 A dynamo converts______________? magnetic energy into electrical energy electrical energy into mechanical energy magnetic energy into mechanical energy mechanical energy into electrical energy 42 / 50 The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:_____________? armature reaction armature resistance drop field weakening due to armature reaction and armature commutation 43 / 50 MOSFET stands for______________? Metal ? oxide semiconductor field effect transistor Metal ? oxide silicon field effect transistor Molybdenum ? oxide semiconductor field effect transistor Metal ? oxide semiconductor field effect transmitter 44 / 50 If the value of a is 0.9, then value of ? is___________? 900 9 0.9 90 45 / 50 _____________is the reference input minus the primary feedback? Manipulated variable Actuating signal Primary feedback Zero sequence 46 / 50 A Triac has three terminals viz ___________? Drain, source, gate None of the above Two main terminal and a gate terminal Cathode, anode, gate 47 / 50 A power supply which has voltage regulation of ____________ is unregulated power supply? 10% 8% 5% 0% 48 / 50 In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________? Short None of the above Open Partially short 49 / 50 In a npn transistor,_____________are the minority carriers? free electrons holes acceptor ions donor ions 50 / 50 The efficiency of a modern boiler using coal and heat recovery equipment is about_____________? 40 to 50% 25 to 30% 85 to 90% 65 to 70% 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 1 Electrical Engineering Quiz 3Next
