Description : Thunderstorms, snowstorms, cosmic sources, the sun, etc., are a few examples of emi sources. What type of emi comes
Last Answer : Natural.
Description : What are the two main sources of emi with which radio waves must compete?
Last Answer : Natural and man-made interference.
Description : The division of the reactive KVA load between paralleled AC generators is initiated by the ______________. A. prime mover governors B. voltage regulators C. phase balance relay D. proportioner
Last Answer : Answer: B
Description : Automatic voltage regulators provided on switchboards function to _____________. A. regulate the AC load on the generator B. protect the switchboard from high voltage C. govern prime mover speed to control voltage D. vary the field excitation to the generators
Last Answer : Answer: D
Description : Which is a function of the voltage regulators used with AC generators? A. To cut out generators when they are no longer required. B. To cut in additional generators automatically as ... between generators operating in parallel. D. To divide reactive current between generators operating in parallel.
Description : The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the _____________. A. voltage regulators B. field rheostats C. reverse power relays D. prime mover governors
Description : Electro-mechanical voltage regulators are generally used in (a) reactors (b) generators (c) transformers (d) all of the above
Last Answer : (b) generators
Description : Cold-cathode tubes can be used as voltage regulators because of what characteristic?
Last Answer : They have the ability to maintain a constant voltage drop across the tube despite changes in current flow.
Description : The two basic types of voltage regulators are ___ and ___
Last Answer : Series and shunt.
Description : The two basic types of voltage regulators are _______ and _______.
Description : The under voltage relay can be used for (a) generators (b) busbars (c) transformers (d) motors (e) all of the above
Last Answer : (e) all of the above
Description : Give some examples of monolithic IC voltage regulators
Last Answer : 78XX series fixed output, positive voltage regulators 79XX series fixed output, negative voltage regulators 723 general purpose regulator.
Description : What are three ways of controlling radiated emi during transmission?
Last Answer : a) physical separation of the antenna (b) limiting bandwidth of the antenna (c) use of directional antennas
Description : What are three ways of controlling the amount of transmitter-generated emi?
Last Answer : (a) filtering and shielding of the transmitter (b) limiting bandwidth (c) cutting the antenna to the
Description : What are the two emi transmission methods?
Last Answer : . Conduction and radiation.
Description : What is emi?
Last Answer : Electromagnetic interference.
Description : Why are centrifugal switches provided on many 1-phase Induction motors?
Last Answer : Centrifugal switches are provided on many 1-phase Induction motors to disconnect the starting / auxiliary winding from the supply when the motor reaches about 70% of its synchronous speed.
Description : In signal generators, what device is used to regulate the voltage of the output signal?
Last Answer : Attenuator.
Description : What type of switches are used as duplexers?
Last Answer : . Electronic.
Description : Electrical machinery insulation will break down more rapidly due to _________________. A. low loading of motors and generators B. frequent megger testing C. high temperatures and vibration D. high operating frequencies
Last Answer : Answer: C
Description : Which of the following precautions should you take when securing propulsion generators and motors for an extended period of time? A. Disconnect the brush pigtails from their contacts and circulate air ... Lift the brushes from commutator collector rings and circulate cool dry air through the units.
Description : Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical ... /generators (B) Generators and small motors (C) Induction motors (D) High frequency transformers
Last Answer : (D) High frequency transformers
Description : For which of the following protection from negative sequence currents is provided ? (a) Generators (b) Motors (c) Transmission line (d) Transformers
Last Answer : (a) Generators
Description : In a D.C. 3-wire distributor using balancers and having unequal loads on the two sides (a) both balancers run as generators (b) both balancers run as motors (c) balancer connected to lightly- loaded side runs as a motor (d) balancer connected to heavily- loaded side runs as a motor
Last Answer : (c) balancer connected to lightly- loaded side runs as a motor
Description : When a transmitter uses a high-power oscillator to produce the output pulse, what switches the oscillator on and off?
Last Answer : High-voltage pulse from the modulator.
Description : Why are multicontact switches used?
Last Answer : Multicontact switches make possible the control of more than one circuit or the selection of one of several possible circuits with a single switch.
Description : Equalization of the power factors of two alternators operating in parallel is accomplished _____________. A. manually, by adjusting the governor controls B. automatically, by automatic voltage regulators ... the output of current transformers D. automatically, by the designed action of the governors
Description : The kilowatt load can be adjusted on a paralleled generator by using the _____________. A. field rheostat B. governor control C. automatic voltage regulators D. hand tachometer
Description : On AC vessels, which of the following statements represents the most difficult problem involved in obtaining a DC potential suitable for use by computer components? A. A stepdown transformer is ... voltage must be rectified and made ripple free. D. Rectifiers cannot operate with voltage regulators.
Description : What are the advantages of sequence control of ac voltage regulators?
Last Answer : a. System power factor is improved. b. Harmonics are reduced in the source current and the load voltage.
Description : What is meant by sequence control of ac voltage regulators?
Last Answer : It means that the stages of voltage controllers in parallel triggered in a proper sequence one after the other so as to obtain a variable output with low harmonic content.
Description : What are the advantages of IC voltage regulators?
Last Answer : *low cost *high reliability *reduction in size *excellent performance
Description : Give the classification of voltage regulators
Last Answer : *Series / Linear regulators *Switching regulators.
Description : Compare the fixed voltage regulators using 78XX and 79XX.
Last Answer : Compare the fixed voltage regulators using 78XX and 79XX.
Description : Lap windings are used in generators designed for what type of application?
Last Answer : Higher load currents are possible
Description : Why are drum-type armatures preferred over the Gramme ring armature in modern dc generators?
Last Answer : Drum-type armatures are more efficient, because flux lines are cut by both sides of each coil.
Description : The main power sources for a satellite are A. batteries B. solar cells C. fuel cells D. thermoelectric generators 58. The maximum height of an ellip
Last Answer : B. solar cells
Description : Shunt, series, and compound wound motors, are all DC motors designed to operate from _____________. A. constant potential, variable current DC sources B. variable potential, constant current DC ... C. variable potential, variable current DC sources D. constant potential, constant current DC sources
Last Answer : Answer: A
Description : What is the full form of 'EMI' ? -How To ?
Last Answer : The full form of 'EMI' is Equated Monthly Instalment
Description : Why Fiber Optics Cable is EMI Free ?
Last Answer : Since fiber optics is made of insulating material, it is free from electromagnetic effects or EMI. The components of fiber optics are soda , boro silicate , soda lime silicate and soda alumina silicate ... and plastic is also an insulating material. As a result, fiber optics is always EMI free
Description : Want an Emi number for a Xiaomi Redmi 6 phone ? Can anyone give imei of xiaomi redmi 8a phone . Tell me what color it is and what color it is.
Last Answer : Imei number of any mobile does not match with any mobile. To know the Imei number of any mobile , dial * # 06 # from that phone.
Last Answer : Equal Monthly Installment of EMI
Description : Is the interference coming from other communications channels? A. Jitter B. Crosstalk C. RFI D. EMI
Last Answer : B. Crosstalk
Description : Unwanted radio signal on assigned frequency. A. Splatter B. RFI C. Noise D. EMI
Last Answer : C. Noise
Description : Fiber-optic cables do not: a. carry current b. cause crosstalk c. generate EMI d. all of the above
Last Answer : d. all of the above
Description : What are report program generators used for?
Last Answer : To generate programs to print detail and summary reports of data files.
Description : What is the basic difference between the primaries of ac and dc rate generators?
Last Answer : The method of primary excitation (ac and permanent magnet).
Description : Range-marker generators produce pulses based on what radar constant?
Last Answer : The radar mile (12.36 microseconds).
Description : What are the two classifications of wave generators according to their output waveshapes?
Last Answer : Sinusoidal and nonsinusoidal.
Description : What term applies to the use of two or more generators to supply a common load?
Last Answer : Parallel operation.