Description : Thevelocityfactor of a transmissionline a. depends on the dielectric constant of the material used b. increases the velocity along the transmission line c. is govern by the skin effect d. is higher for a solid dielectric than for air
Last Answer : a. depends on the dielectric constant of the material used
Description : What is the reactance property at the input of a shorted quarter wavelength line? A. A parallel LC circuit B. A pure inductive reactance C. A series LC circuit D. A pure capacitive reactance
Last Answer : A. A parallel LC circuit
Description : Short-circuited stubs are preferred to open-circuited stubs because thelatter are a. more difficult to make an connect b. made of a transmission line with a different characteristic impedance c. liable to radiate
Last Answer : c. liable to radiate
Description : Impedance inversionmaybe obtainedwith a. a short-circuited stub b. an open-circuited stub c. a quarter-wave line d. a half-wave line
Last Answer : c. a quarter-wave line
Description : The synchronous reactance of the synchronous machine is ______________. (A) Ratio between open circuit voltage and short circuit current at constant field current (B) Ratio between short circuit ... (D) Ratio between short circuit voltage and open circuit current at different field current
Last Answer : Ans. A The Synchronous reactance of a synchronous machine is a total steady state reactance, presented to applied voltage, when rotor is running synchronously without excitation. Therefore , XS = Ef / IS = Emf of OC for same If / short circuit current
Description : What is meaning of short circuit?
Last Answer : A short circuit occurs when conductors are connected (shorted) together by a fault. This is normally phase to phase fault due to failure of insulation by something cutting the wires, fires, etc.
Description : Indicate which of the following material does not retain magnetism permanently. (a) Soft iron (b) Stainless steel (e) Hardened steel (d) None of the above
Last Answer : (a) Soft iron
Description : Indicate the antenna thatisnotwideband: a. Discone b. Folded Dipole c. Helical d. Marconi
Last Answer : d. Marconi
Description : A loss less line of characteristic impedance Z0 is terminated in pure reactance of –jZ0 value. VSWR is (1) 10 (2) 2 (3) 1 (4) Infinity
Last Answer : A loss less line of characteristic impedance Z0 is terminated in pure reactance of –jZ0 value. VSWR is Infinity.
Description : Pure semiconductors silicon and germanium are a) Extrinsic b) Intrinsic c) Insulator d) Diodes
Last Answer : b) Intrinsic
Description : The process of addition of impurity in pure semiconductor is : a) Doping b) Radiating c) Mixing d) Insulating
Last Answer : d) Insulating
Description : Name any two methods of reducing short circuit current/ By providing neutral reactance.
Last Answer : By introducing a large value of shunt reactance between buses.
Description : If the % reactance upto the fault point is 20%, then the short circuit current will be
Last Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current
Description : The ground indicating light on the main electrical switchboard is indicating a ground. The best procedure for locating the grounded circuit is to _____________. A. trace the circuit paths while looking for ... a time, until the lights no longer indicate a ground D. check all circuits for continuity
Last Answer : Answer: C
Description : The purpose of the capacitor within component 'B' of the circuit shown in the illustration is to ____________. EL-0081 A. prolong the life of the component's contacts B. discharge the neon within ... the inductive reactance in the circuit D. store power to operate the circuit should 'D' open
Last Answer : Answer: A
Description : Which of the following parameter can be neglected for a short line ? (a) Inductance (b) Capacitance (c) Resistance (d) Reactance
Last Answer : (b) Capacitance
Description : relay is preferred for phase fault on short transmission line. (a) Induction type (b) Reactance (c) Impedance (d) None of the above
Last Answer : (b) Reactance
Description : An AC circuit has capacitance arranged in series. If the line voltage remains constant, the capacitive reactance value can be varied by changing the _____________. A. line frequency B. resistance C. number of commutating poles D. number of interpoles
Description : Zoningis usedwith adielectric antenna inorderto a. reduce the bulk of the lense b. increase the bandwidth of the lens c. increase pin-point focusing d. correct the curvature of the wavefront from a horn that is too short
Last Answer : a. reduce the bulk of the lense
Description : .A(75-j50)-is connectedtoa coaxialtransmission lineofZO=75 ,at 10GHz.The bestmethod ofmatching consistsin connecting a. a short-circuited stub at the load b. an inductance at the load c. a capacitance at some specific distance d. a short-circuited stub at some specific distance from the load
Last Answer : d. a short-circuited stub at some specific distance from the load
Description : Write short notes on fire extinguishing methods adopted in electrical engineering.
Last Answer : Stand 6 to 8 feet away from the fire and follow the four-step PASS procedure. If the fire does not begin to go out immediately, leave the area at once. Always be sure ... fire causing the particles to expand chemically inhibiting combustion and expelling the oxygen thereby smothering the flames.
Last Answer : electricity Source , conductor , control Instruments , Usage Machines , Protection Machines In combination Such A Path Whose The middle With Current Flowing To be Can Him Circuit Or Circuit Says.
Description : A 0-10 mA PMMC ammeter reads 5mA in a circuit; its bottom control spring snaps out suddenly the meter will now read. a) 5mA b) 10mA c) 2.5mA d) 0
Last Answer : Ans: 0
Description : After a black out the emergency generator comes on; On restoring the main supply we are closing the circuit breaker of the main generator without bothering about synchronizing. How is this possible?
Last Answer : There is a power link connection breaker between the main generator and the emergency generator. During black out, this breaker trips. The emergency generator starts and its breaker closes and feeds only ... , there is no paralleling between main and emergency generator. Ask E/O for more details.
Description : What is a self-monitoring alarm circuit?
Last Answer : It self monitors the health of the alarm circuit. That is, it senses whether the power supply to the alarm circuit is healthy and all the relays and contacts are functioning normally. Check with E/O for more details.
Description : Can you draw a DOL starter circuit?
Last Answer : Refer to DOL diagram in Dennis T Hall
Description : The circuit which changes input signal at output with phase shift of 1800 is called (a) Amplifier (b) operational amplifier (c) switch (d) inverter
Last Answer : (d) inverter
Description : Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons
Last Answer : (b) majority carriers
Description : The number of diodes used in bridge rectifier circuit is (a) 4 (b) 3 (c) 2 (d)
Last Answer : (a) 4
Description : The induced emf is produced in a circuit due to: a. Initial magnetic flux b. final magnetic flux c. Change of magnetic flux d. constant magnetic flux
Last Answer : d. constant magnetic flux
Description : A circuit which develops voltage across the horizontal deflection plates is known as a) Time base generator b) Electron gun c) Thermionic diode d) Zener diode
Last Answer : a) Time base generator
Description : Why should a resistance be introduced in a circuit in series deliberately? a. to increase current b. to decrease current c. to control current d. just to give a good look to circuit
Last Answer : b. to decrease current
Description : Resistance between points A and B in the circuit shown in figure is a. 4 ohm b. 6ohm c. 10 ohm d. 8 ohm
Last Answer : c. 10 ohm
Description : The current in the circuit shown in figure - What will be the current in the circuit? a. 1/45A b. 1/10A c. 1/5A d. 5A
Last Answer : b. 1/10A
Description : Circuit which gives continuously varying potential is called a. complex network b. wheat stone bridge c. potential divider d. all of above
Last Answer : c. potential divider
Description : الرجوع إلى الدائرة أدناه. الطاقة التي يستهلكها العنصر E متساوية.
Last Answer : The power consumed the element E is equal to the : P = V x I = 6V x 1 A = 6 W
Description : Refer to the circuit below. The voltage V2, is equal to:
Last Answer : The answer to this question is -3V. Because 3V is in parallel with v2 and voltages in parallel are equal. But it is in opposite direction so the answer is -3V.
Description : Briefly explain how the power factor of an inductive circuit can be improved.
Last Answer : As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.
Description : What is electrical circuit ?
Last Answer : An electric circuit is the interconnection of electrical elements. Electrical elements like battery, lamp, wire etc.
Description : A circuit breaker is designed to protect an electrical circuit from damage caused by : (A) Over load (B) Short circuit (C) Over current (D) All of the above
Last Answer : A circuit breaker is designed to protect an electrical circuit from damage caused by : (A) Over load (B) Short circuit (C) Over current (D) All of the above
Description : An electrical circuit with 10 branches and 7 junctions will have
Last Answer : An electrical circuit with 10 branches and 7 junctions will have 4 loop equations.
Description : The resistance of a few meters of wire conductor in closed electrical circuit is?
Last Answer : The resistance of a few meters of wire conductor in closed electrical circuit is practically zero.
Description : Power factor of an electrical circuit is equal to?
Last Answer : Power factor of an electrical circuit is equal to R/Z, cosine of phase angle difference between current and voltage, kW/kVA.
Description : What is a node in an electrical circuit?
Last Answer : a positively charged electrons
Description : What is the meaning of a normally open contact?
Last Answer : The contact is open in the normal (de-energised condition).
Description : The open loop gain of the amplifier is ______ (a) 105 (b) 103 (c) 106 (d) 108
Last Answer : (a) 105
Description : With both ends of a three conductor cable disconnected and arranged without the conductors touching each other, an ohmmeter reading of 'zero' ohms between the ends of one conductor would indicate _____________. A. continuity B. a partial ground C. the resistance is infinite D. a short circuit
Description : If a voltage tester is being used to check for defective fuses in the circuit, shown in the illustration, which of the readings will indicate that fuse #2 is open? EL-0062 A. C-B full voltage B. A-D full voltage C. A-D no voltage D. C-B no voltage
Description : If 450 volts AC were measured across the load as shown in the illustration it would indicate a/an _______________. EL-0083 A. open winding between 'H1' and 'X1' B. properly operating circuit C. open winding between 'X1' and 'X4' D. ground on one side of 'Ep'
Last Answer : any Magnetic In the case A Isolated The answer To the pole In the free state Placement If you do The pole That Path Circulation By Him Magnetic Ball line Says.