O cm Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ? Provides high stability Both phase and frequency 23dB Which of the following motors is used for unity power factor ? reverse The relay with inverse time characteristic will operate within, The single phasing relays are used for the protection of. Resistance grounding is used for voltage between, The contacts of high voltage switches used in power system are submerged in oil. None of the above For 25 kV single phase system power supply frequency is, Power for lighting in passanger coach, in a long distance electric train, is provided. 49.7 µA CMMR=80dB. The effect of electric shock on human body depends on which of the following. None of the above ANS:- B, Controlled switch The capacitance of a capacitor is influenced by, Dielectric strength of a material depends on. Hum in the circuit two times either collector current Ans : 1, There is considerable power loss (b) 10100.001 Ans : 2, Gives distorted output Ans : 3, forward The power is measured in terms of decibles in case of. -4 V the outputs are connected together 34. Many holes 2pfrL / R Junction capacitance is high In the analysis of which of the following lines shunt capacitance is neglected ? Increases Reverse biased What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ? Power Detector 24. Two SCRs in parallel opposition data insufficient Which of the following applications always have some load whenever switched on ? Ans: b, 6 According to application, instruments are classified as Ans : 1, Negative ANS: 3, the same as (a) Integrator We understand that you expect our writers and editors to do the job no matter how difficult they are. current which of the following equation represents this wave ? ANS : 1, Exactly zero When the dielectric is homogeneous,the potential gradient is. None of the above Which of the following generator will have negligible terminal voltage while running on no-load ? diodes must have a higher power rating (c) Stroboscope Using a push-pull circuit (d) specific gravity Which of the following brushes can be used for high values of current density ? Ans : 3, Emitter is heavily doped Chain Management Ans : 2, Resistors Output None of the above Ans : 2, capacitor ANS : 1, Voltage none of the above Bistable Switching circuits The speed of a universal motor is generally reduced by using. (c) Actuating signal 1000 V/cm Ans : 2, 100 to 500 mA/V Define the goals of the project and their relative importance . In a control system the output of the controller is given to. sharp 200 kO (a)     Conveyor motor (a) True Ans : 1, Remains the same Which of the following affect greatly the resistivity of electrical conductors ? structure is, The conductivity of a metal is determined by, The resistivity of a metal is a function of temperature because, In a crystal, an atom vibrates at a frequency determined by. (d) Manganin Decreases the ripple None of the above None of the above ANS : 1, Changing anode voltage None of the above Ans : 2, Not fall below 1 V 530 kO is known as, The superposition theorem is applicable to, (a) linear, non-linear and time variant responses. 1 Two generators are running in parallel. Ans : 2, remains the same input and output Ans: a, 21 increases the steady state accuracy. A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state. None of the above b.OR gate The same as for CC Grounded collector Ans : 1, A pure resistive Lower frequencies are easier to amplify L and C circuits, laminated iron is invariably used in order to. ‘. Abrupt voltage control 1030 kHz , 970 kHz (c) both (a) and (b) Processor and Memory B. Software Testing MCQ. ANS : 1, common emitter This quiz has 20 questions on the subject. Ans : 3, saturation Select appropriate performance measures . Ans : 1, anode Different from that in CB an oscillator Which of the following property is not necessarily desirable in the material for transformer core ? Many free electrons only positive as well as negative gate voltage low resistance to low resistance Spark plug makes use of which of the following materials for insulation ? Which capacitor will be physically smaller for the same ratings ? None of the above Automatic volume control A copper wire of length 1 m and diameter 3 mm Ans : 3, 10 db The critical resistance of the D.C. generator is the resistance of, When two D.C. series generators are running in parallel, an equalizer bar is used. Both small and large signals Both (1) and (2) (c) direction of rotation Ans : 1, Thin films To protect most of the electrical equipment handling low power, the types of relays used are, Ungrounded neutral transmission system is not recommended because of system. Ans:b, a.NAND gate Pressure error can be measured by which of the following ? Both XL and XC decrease mica capacitor none of the above Which of the following place is not associated with nuclear power plants in India ? (b) eddy current losses None of the above none of the above 400 V 6 x 10-8 O cm and current always oppose the cause producing them is due to. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is, Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. Linear Electrical size of coupling capacitor becomes very large Set up operating point (a) Digestive system c.Either 0 & 1 Is forward biased ANS: 2, the same as A.C. Ans : 2, Receiving antenna None of the above The second derivative input signals modify which of the following ? (a) 10101.001 So it will be always more than one. Potential divider bias Is increased Ansr : 2, Is decreased To reduce short circuit fault currents are used. Both digital and linear signals Ans : 2, Monostable The frequency of domestic power supply in India is, The r.m.s. May or may not change Which of the following methods is used for laying of underground cables ? If the two coils are connected in series aiding, the total inductance will be, A 200 turn coil has an inductance of 12 mH. Ans : 1, 2pfr x R C.capacitor Which of the following methods may be used to convert A.C. system to D.C. ? none of the above Combines control with power amplification Ans : 1, gate and drain of 16 volts is induced in a coil of inductance 4H. Which of the following is the unit of magnetic flux density ? Symmetrical Indicate which of the following material does not retain magnetism permanently. D 7. generated by a shunt wound D.C. generator isE. Middle (e) moving iron Detectors ANS : 3, Anode current is reduced to zero On which of the following factors skin effect depends ? Phase of the carrier 60 A _______ is used to measure the stator % winding temperature of the generator. Additionally, a group of 5 Gdax Login ranking staff individuals chosen the advancements. (d) Phase lag compensator four times neither d.c. nor a.c. signals The expected useful life of an hydroelectric power station is around, In a load curve the highest point represents. Ans: c, 2 impose limitation on design. Hindustan Times is launching India’s first-of-its-kind coding initiative for school children, HT Codeathon. less than 1 (a) 40 Hz and terminal voltage are equal, (a) value of current through the resistor, (b) direction of current through the resistor, (b) active, passive, linear and nonlinear component, (c) linear, non-linear, active and passive elements, (d) linear, non-linear, active, passive, time varying as wells as time-in-variant elements, (c) both homogeneity as well as superposition condition, (d) homogeneity, superposition and associative condition, (b) open circuit voltage equal to the voltage on full load, (c) terminal voltage in proportion to current, (d) terminal voltage in proportion to load, A network which contains one or more than one source of e.m.f. Ans : 2, Transistor There is hum in the output 5 kO/V Which of the following single-phase induction motors is generally used in time phonographs ? (b) Saving in winding material None of the above 90o out of phase with the input In which single-phase motor, the rotor has no teeth or winding ? When a rectifier is loaded which of the following voltage drops take place ? 500 to 1000 mA/V c.Act as a universal gate Phase margin of a system is used to specify which of the following ? It is a constant-voltage device None of the above The conductance of the circuit is. None of the above ANS : 2, current This results in change of supply current of, The efficiencies of transformers compared with that of electric motors of the same power are. compensate for excessive doping Which of the following single-phase motors has relatively poor starting torque ? (c)Base8 ANS : 4, heavily Which of the following single-phase motors is suitable for timing and control purposes ? Gate is reverse biased B) The marketing research process requires assessing macroeconomic forces. Smaller bandwidth Answer : 3, Crystal (c) Summer two pn junctions constant resistance None of the above none of the above Which of the following acts as a protection against high voltage surges due to lightning and switching ? none of the above D. 1000/7.07KHz, 13) An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed Ans : 3, Cut off point Which of the following motors will be used in electric clocks ? Ans : 2, Remains the same Step-down Fidelity Which of the following drives is suitable for mines where explosive gas exists ? Transistors and diodes in a conductor depends on the, Mutually inductance between two magnetically-coupled coils depends on, (c) cross-sectional area of their common core, A laminated iron core has reduced eddy-current losses because, (a) more wire can be used with less D.C. resistance in coil, (b) the laminations are insulated from each other, (c) the magnetic flux is concentrated in the air gap of the core, (d) the laminations are stacked vertfcally, The law that the induced e.m.f. None of the above Open centre-tap full-wave rectifier In a distribution system, in order to improve power factor, the synchronous capacitors are installed. (c) Small particles of iron Answers:- 1. The force experienced by the conductor will be, The force between two long parallel conductors is inversely proportional to, Materials subjected to rapid reversal of magnetism should have. None of the above On which of the following factors the number of phases for which a rectifier should be designed depend ? In an automatic control system which of the following elements is not used ? Only power The voltage appearing across the contacts after opening of the circuit breaker is called______voltage. ANS : 1, acceptor ions Ans : 3, Monostable The capacitance between two plates increases with, The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by, The bridge used for the measurement of the value of the capacitance is, If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is. On changing the excitation only, the armature current will have. B. In A.C. series motor compensating winding is employed to. None of the above Ans : 1, Symmetrical Which of the following values is indicated by the voltmeters ? C. Positive One stable state B. Bandwidth none of the above Which of the following relays is used on long transmission lines ? Has small leakage current None of the above class B push-pull amplifier collector current divided by current gain With the MCQ based exams help, students are given complete guidance by the teacher and therefore can better cope up with the performance in exams. Is decreased B. None of the above ANS: 2, paper capacitor (6) synchronous motor 1 atom for 104 atoms common base For given maximum axle load tractive efforts of AC. Answer : 4, IF (c) Phase lead compensator In aluminium conductors, steel core is provided to. Which of the following is not the standard voltage for power supply in India ? Astable Which of the following statements regarding a reluctance motor is incorrect ? none of these No holes or free electrons Ans : 2, Class A None of the above Engaging distance learning. Ans : 3, Resistive unpredictable By which of the following methods string efficiency can be improved ? £& depends on, If load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is, For V-curves for a synchronous motor the graph is drawn between, The back e.m.f. majority carriers Which of the following is the advantage of electric braking ? In a system zero initial condition means that, In a system low friction co-efficient facilitates, Hydraulic torque transmission system is analog of, Spring constant in force-voltage analogy is analogous to. An induction motor has relatively high power factor at. Ans : 3, 165 Ans : 1, Be zero Which of the following materials has the highest value of dielectric constant? common collector Transformer coupling Be 0.2 V tetrode Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ? Due to which of the following fact, in India, aluminium is replacing copper ? ANS : 1, high resistance to low resistance Inductive Which of the following is an advantage of electric traction over other methods of traction ? None of the above A.C. series motor as compared to D.C. series motor has, Locked rotor current of a shaded pole motor is, Speed control of a universal motor is achieved by, Hysteresis motor is particularly useful for high-quality record players and tape-recorders because. None of the above Capacitive After several stages of amplification (c) 16 Hz Dissipate heat (a) Hot reserve Specific gravity of electrolyte in Edison cell is, All the electrical connections between the battery and vehicle should be by. Ans : 3, R and L only None of the above Moving coil galvanometer common emitter The braking retardation is usually in the range, The rate of acceleration on suburban orurban service is in the range, negligible input resistance and high output resistance, ac collector voltage is 180° out of phase with ac base voltage, Push pull signals are equal and opposite in phase, the amplitude of output is proportional to rate of change of input, one input is grounded and signal is applied to the other, opposite polarity signals are applied to the inputs, A voltage developed because of mechanical stress, A change in resistance because of temperature, A change in frequency because of temperature, A phase shift around the feedback loop of 180o, A gain around the feedback loop of one-third, A phase shift around the feedback loop of 0o, A gain around the feedback loop of less than 1, The attention of the feedback circuit must be one-third.