Description : What are the two inputs to an amplidyne?
Last Answer : The mechanical force applied to turn the amplidyne, and the electrical input signal.
Description : The purpose of the series quadrature windings in an Amplidyne - a) Neutralize the effect of Armature Reaction b) Reduce commutation difficulties c) Increase the gain d) Increase the response time
Last Answer : The purpose of the series quadrature windings in an Amplidyne - Increase the gain
Description : Most large alternators have a small dc generator built into them. What is its purpose?
Last Answer : To provide dc current for the rotating field.
Description : What are the differences between the components of a dc generator and a dc motor?
Last Answer : There are no differences.
Description : What is the effect of motor reaction in a dc generator?
Last Answer : A force which causes opposition to applied turning force.
Description : How can field strength be varied in a practical dc generator?
Last Answer : By varying the input voltage to the field coils
Description : What component causes a generator to produce dc voltage rather than ac voltage at its output terminals?
Last Answer : A commutator
Description : The purpose of DC generator brushes is to _____________. A. neutralize armature reaction B. conduct electric current to an outside circuit C. convert DC current to AC current D. provide excitation to a DC generator
Last Answer : Answer: B
Description : The purpose of the commutator and brushes on a DC generator is to _____________. A. transfer generated direct current voltage from the armature to the line B. convert the alternating voltage ... contact method to excite the field D. reduce sparking between the armature and the carbon brushes
Description : How can a series-positive limiter be modified to limit unwanted negative portions of the input signal?
Last Answer : Biasing.
Description : How can a peak detector for pam be modified to detect pdm?
Last Answer : By making the time constant for charging the capacitor at least 10 times the maximum received pulse width.
Description : What is the function of brush in DC generator ?
Last Answer : The brush on the DC generator looks a lot like a rectangle. The brush is used for contacts that supply the output. It is made of carbon graphite.
Description : State the function of commutator in DC generator and name the material used for commutator.
Last Answer : Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.
Description : What is the purpose of dirty/modified bit in Cache memory?
Last Answer : To tackle whether a page has been written since it was read into the memory, o dirty but is added to the page table.
Description : What is the purpose of a function generator?
Last Answer : A function generator creates electrical waveforms. The purpose is for developing and testing electric equipment.
Description : Rather than using a stored program, a special-purpose computer's applicability to a particular problem is a function of what?
Last Answer : Its design
Description : What is added to a sawtooth generator to produce a trapezoidal wave?
Last Answer : A resistor.
Description : In a sawtooth generator, why is the transistor turned on for a longer time than the discharge time of the RC network?
Last Answer : To allow the capacitor time to discharge.
Description : Increasing gate length in a sawtooth generator does what to linearity?
Last Answer : Decreases linearity.
Description : When measuring receiver sensitivity, what quantities must you add to the dBm reading obtained on the signal generator or test set?
Last Answer : Attenuations of the directional coupler and the connecting cable.
Description : The range sweep in a range-gate generator is started at the same time as what other pulse?
Last Answer : Transmitter.
Description : A generator uses what method to produce a voltage?
Last Answer : Magnetic.
Description : When measuring harmonic distortion, you set the signal generator to input a 15-kHz test signal. To what frequency should you set the wave analyzer?
Last Answer : 45 kHz.
Description : While measuring frequency response, as the signal generator approaches the lowest and highest frequency the recorder can effectively record, the VTVM reading drops to less than - 3 dB. What does this indicate?
Last Answer : The upper and lower limits of the frequency response specification for that tape recorder.
Description : How many commutator segments are required in a two-coil generator?
Last Answer : Four
Description : What minimum/maximum voltage level can be attained in the pulse generator section by adjusting the LEVEL control?
Last Answer : 0 to 5 volts.
Description : Name the three main sections of a typical rf signal generator.
Last Answer : Oscillator circuit, modulator, and output control circuit.
Description : What generator characteristics must be considered when alternators are synchronized for parallel operation?
Last Answer : Output voltage, frequency, and phase relationships.
Description : What determines the phase relationship between the voltages in a two-phase ac generator?
Last Answer : Placement of armature coils.
Description : 4. The essential difference between an AC generator and a DC generator is that -Physics-10
Last Answer : AC generator has slip rings while the DC generator has a commutator. AC generators have two rings known as the slip rings while DC generators have two half rings known as the commutator. This is main difference between AC generator and DC generator.
Description : In a dc generator why does total flux per pole decrase if the load on the machine increases even thought the field current is constsn?
Last Answer : Due to armature reaction
Description : What is the best brand of DC generator?
Last Answer : Currently Polaris is the best brand on DC generators. Hitachi and Coleman also make very reliable ones.
Description : What are the best DC Generator made in the USA?
Last Answer : Generac, Briggs & Stratton, and Honda are all excellent generator companies. It's best to determine your needs, then decide on the size/model of generator.
Description : In the schematic diagram of the DC compound generator shown in the illustration, the positive ammeter reading is 500 amps and the negative ammeter reading is 475 amps. What is the current flow through the neutral bus? EL-0037 A. 0 amp B. 12.5 amp C. 25 amp D. 975 amp
Last Answer : Answer: C
Description : Moving the rheostat handle shown in the illustration, that is used to control a DC generator, towards the 'raise' direction will increase the _____________. EL-0030 A. field resistance B. armature resistance C. armature speed D. line voltage
Last Answer : Answer: D
Description : As shown in the illustration, the generator field is excited with DC current provided by ____________. EL-0016 A. conductors '1', '2' and '3' B. inductor 'L1' C. rectifier 'CR1' D. winding 'S-2'
Description : Which of the listed electrical devices is represented by the symbol shown in the illustration? EL-0055 A. Fixed resistance resistor B. Coil with magnetic core C. DC motor or generator shunt field D. Transformer
Description : Moisture accumulating in electric motors and generator windings having a cold insulation resistance greater than 50,000 ohms may be baked out with internal heat. This heat can be developed by ____________. ... an electric welder and feeding it into the armature while running the motor at full speed
Last Answer : Answer: A
Description : If the connections for the field and the armature on a DC motor are reversed, _____________. A. the motor will run as a generator B. the motor will not run C. the direction of rotation will be the same D. the direction of rotation will be reversed
Description : An equalizing connection between two compound-wound DC generators when paralleled, serves to _____________. A. reverse the polarity of the incoming generator as the series field weakens B. automatically ... the series field of the incoming generator D. parallel the series fields of the generators
Description : DC generator voltage is decreased by cutting _____________. A. in field resistance B. out field resistance C. in armature resistance D. out armature resistance
Description : A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an _____________. A. rotor B. stator C. exciter D. armature
Description : A flickering ground detection lamp on a DC system would indicate a _____________. A. multiple-ground condition in the distribution system B. ground in an armature coil of an operating machine C. ground in a motor accompanied with a short D. short between two adjacent bars of the generator commutator
Description : The voltage developed by an AC generator is controlled by varying the ____________. A. speed of the prime mover B. AC excitation to the field C. DC excitation to the field D. DC excitation of the voltage regulator
Description : In the illustration, the component labeled 'EXC' is _______. EL-0003 A. a separate class II regulated DC generator for critical direct current loads B. a generator feeding the FLD ... to drive the governor for turbogenerator speed. D. the electronic driver for the switchboard metering circuits
Description : Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions? A. The generator and bus transfer section B. The 450 volt, 60 cycle, 3 phase bus C. The 120 volt, 3 phase, 60 cycle bus D. The 24 volt DC bus
Description : The voltage output of an AC generator is accurately controlled by _____________. A. changing the sensitivity of the prime mover to large changes in voltage B. varying the reluctance of the air gap C. varying the DC exciter voltage D. shorting out part of the armature windings
Description : Normally, the FIRST step in troubleshooting a transistor circuit card is to _____________. A. carefully remove the transistors from the card B. give the circuit an initial test with a signal generator C. test for continuity with a low voltage DC supply D. visually inspect the card
Description : A shunt-wound DC generator is one in which the shunt field windings are in parallel with the _____________. A. commutator B. brushes C. armature D. all of the above
Description : A DC shunt generator has its field windings connected in _____________. A. series with the series windings B. parallel with the field rheostat C. series with the armature windings D. parallel with the armature windings