0% 0 Electrical Engineering Quiz 9 1 / 50 Most efficient plants are normally used as____________? none of the above peak load plants All base load plants 2 / 50 In D.C. shunt motors as load is reduced__________________? the speed will increase abruptly the speed will remain almost/constant the speed will reduce the speed will increase in proportion to reduction in load 3 / 50 Which of the following methods is used for air cooling of turbo-alternators ? Multiple inlet system One sided axial ventilation Two sided axial ventilation All of the above 4 / 50 Due to non sinusoidal waveform of the input current, the power factor of the rectifier is____________? Negatively affected by firing angle Negatively affected by distortion of the input current Both (a) and (b) Positively affected by both firing angle and distortion of the input current 5 / 50 The d.c. resistance of a crystal diode is ______________ its a.c. resistance? the same as more than less than none of the above 6 / 50 In hydro power plant, the graph between discharge and time is known as___________? monograph. load graph. hydro graph discharge graph. 7 / 50 The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________? boo zoom magnetostrication hum 8 / 50 Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators? Medium duty Light duty All of the above Heavy duty 9 / 50 When one leg of parallel circuit is opened out the total current will______________? become zero reduce decrease increase 10 / 50 A multirangq instrument has________________? multiple shunt or series resistances inside the meter variable turns of coil multicoii arrangement multi range meters inside the measurement system 11 / 50 During gate recovery time_____________? charge carriers of J2 junction is swept out charge carriers of J2 junction recombined charge carriers of J3 junction is removed charge carrier of J1 junction removed 12 / 50 Which of the following drives is suitable for mines where explosive gas exists ? Steam engine Diesel engine Battery locomotive Any of the above 13 / 50 Which one is most suitable power device for high frequency (>100 KHz) switching application? BJT Schottky diode Microwave transistor Power MOSFET 14 / 50 For derries and winches which of the following drives can be used ? Pole changing squirrel cage motors D.C. motors with Ward-leonard con-trol A.C. slip ring motors with variable resistance Any of the above 15 / 50 Which of the following applications always have some load whenever switched on ? All of the above Pistol drills Vacuum cleaners Fan motors 16 / 50 For which of the following power plants highly skilled engineers are required for running the plants? Solar power plants Hydro-electric power plants Nuclear power plants Gas turbine power plants 17 / 50 In rectifiers, load current flow is_________? Either (a) or (b) Unidirectional Non directional Bidirectional 18 / 50 The number of stages that can be directly coupled is limited because___________? None of the above It becomes difficult to bias the circuit Circuit becomes heavy and costly Changes in temperature cause thermal instability 19 / 50 increases the steady state accuracy? Phase lead compensator Integrator Phase lag compensator Differentiator 20 / 50 A 25eV electron has a speed of______________? 3 x 106m/sec 5 x 106m/sec 2 x 106m/sec 4 x 106m/sec 21 / 50 The parallel combination of a 6.8 k? resistor and a 10 k? resistor is in series with the parallel combination of a 2.2 k? resistor and a 1 k? resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)___________? 6.8 k? 2.2 k? 2.2 k? and 1 k? 6.8 k? and 10 k? 22 / 50 When load current is zero, the Zener current will be_____________? Minimum Zero Maximum None of the above 23 / 50 If P is the power of a star connected system then what will be power of an equivalent delta connected system? P/3 None of the above 3P P 24 / 50 Which of the following motors is used in tape-recorders ____________? Capacitor-run motor Hysteresis motor Universal motor Reluctance motor 25 / 50 A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________ remain same increase heater will burn out decrease 26 / 50 With feed back __________ reduces? system gain none of the above system stability system stability and gain 27 / 50 In a D.C. machine the current per brush arm should not be more than_____________? 300 A 100 A 200 A 400 A 28 / 50 The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________? will always be 250 V may be greater or less than 250 V none of the above will be less than 250 V 29 / 50 If the supply voltage for a D.C. motor is increased, which of the following will decrease ? Full-load current Starting torque Operating speed All of the above 30 / 50 For the induced draught the fan is located_______________? at the top of the chimney near bottom of chimney anywhere permissible near bottom of furnace 31 / 50 A single phase full bridge inverter can operated in load commutation mode in case load consist of______? RL. RLC critically damped RLC overdamped. RLC underdamped. 32 / 50 As -the load is increased the speed of D.C. shunt motor will____________? increase proportionately increase slightly reduce slightly remains unchanged 33 / 50 The main disadvantage of a mechanical switch is that it_______________? Is operated mechanically Is costly Has high inertia None of the above 34 / 50 There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 m The current through the fourth resistor is______________? 12:00 AM 800 mA 310 mA 490 mA 35 / 50 Which of the following is not a routine test on transformers ? Impedance test Polarity test Core insulation voltage test Radio interference test 36 / 50 A tuned amplifier uses__________load? Inductive Resistive LC tank Capacitive 37 / 50 Distribution transformers are generally designed for maximum efficiency around________________? 90% load zero load 50% load 25% load 38 / 50 No-load speed of which of the following motor will be highest ? Series motor Shunt motor Differentiate compound motor Cumulative compound motor 39 / 50 In a Schering bridge the potential of the detector above earth potential is______________? 5 kV 1 kV a few volts only 10 kV 40 / 50 The conduction of electricity, in semiconductors, takes place due to movement of______________? negative ions only electrons and holes positive ions only positive and negative ions 41 / 50 When a crystal diode is used as a rectifier, the most important consideration is ____________? doping level PIC rating forward characteristic reverse characteristic 42 / 50 For a diesel generating station the useful life is expected to be around_________Years? 75 to 100 years 20 to 50 years 50 to 75 years 15 to 20 years 43 / 50 A semiconductor is formed by ______________bonds? Co-ordinate Electrovalent None of the above Covalent 44 / 50 The phosphors for which of the following pair are 180? out of phase for VL, VC and VR______? VL and VR Vc and VL Vc and VR none of the above 45 / 50 A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor ? None of the above 3 6 5 46 / 50 Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ? Indicating instruments Integrating instruments Absolute instruments Recording instruments 47 / 50 The maximum power developed in a synchronous motor occurs at a coupling angle of____________? 30? 60? 90? 180? 48 / 50 The bridge used for the measurement of the value of the capacitance is____________? Hay?s bridge Schering bridge Wien?s bridge Wheatstone bridge 49 / 50 Four 8 ? speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________? 48 W 1.5 W 18 W 72 W 50 / 50 The typical time of rising time lies between______________? 10 ? 20 ?s 90 ? 100 ?s 1 ? 4 ?s 40 ? 60 ?s 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 8 Electrical Engineering Quiz 10Next
