Questions

This is a list of all the questions and their associated study carrel identifiers. One can learn a lot of the "aboutness" of a text simply by reading the questions.

identifier question
22766How can it be accomplished?
22766Why can not electricity act as an agent to purify our drinking water, to sterilize sewage and to arrest offensive odors?
49769555 the readings show 6 volts and 2 amperes how many ohms is the resistance being tested?
49769At what point of a shunt coil does a break usually occur?
49769At what point on the commutator should the brushes bear?
49769Can a dynamo be reversed by reversing the connections between the field coils and the armature?
49769Can this test be made with any kind of voltmeter?
49769Does the astatic galvanometer give correct readings for different values of the current?
49769EXAMPLE.--If an arc lamp require a current of 8 amperes, how much electricity does it consume per hour?
49769For what kind of resistance is the method adapted?
49769For what kinds of service are speed regulators used?
49769For what kinds of test is the voltmeter method best adapted?
49769For what service is the D''Arsonval galvanometer adapted?
49769For what use are galvanometers employed?
49769For what use is the astatic galvanometer adapted?
49769Has the sine galvanometer a large range?
49769How are compound dynamos connected to operate in series?
49769How are shunt ammeters arranged to correctly measure the current?
49769How are small series motors started on battery circuits?
49769How are the brush holders tested?
49769How are the brushes set by these marks?
49769How are the coils adjusted?
49769How are the connections arranged to avoid excessive voltage in the windings due to self- induction?
49769How are the field coils of all the dynamos connected in parallel?
49769How are the field coils tested for short circuit?
49769How are the most accurate results obtained?
49769How are the terminals liable to be short circuited?
49769How can shunt motors be controlled from a distant point?
49769How can this be overcome?
49769How does an excessive current injure a dynamo?
49769How does moisture in the armature coils affect the armature?
49769How does the lead vary in the different types of dynamo?
49769How does the reverse voltage affect the starting of a motor?
49769How does the speed vary with respect to variation of field strength?
49769How does the winding differ in ammeters and voltmeters?
49769How is a commutator segment pulled out to its correct position?
49769How is a compound dynamo, running in parallel, cut out of circuit?
49769How is a machine cut out of the circuit?
49769How is a shunt motor started?
49769How is a voltmeter connected?
49769How is a wide range of speed regulation secured?
49769How is an untrue commutator detected?
49769How is heating detected?
49769How is it known whether too much or too little resistance be unplugged?
49769How is maximum efficiency secured with variable load?
49769How is moisture in the field coils detected?
49769How is the coil affected by a change in the direction of the current?
49769How is the commutator easily tested as to the condition of its surface?
49769How is the current measured?
49769How is the current strength measured?
49769How is the direction and strength of the current indicated?
49769How is the electrodynamometer adapted to measure volts or watts?
49769How is the equalizer connected?
49769How is the faulty coil located?
49769How is the field circuit tested for breaks?
49769How is the insulation affected by moisture?
49769How is the pressure adjustment made?
49769How is the proper brush contact secured?
49769How is the sine galvanometer operated?
49769How is the speed of shunt and compound motors varied with respect to the normal speed in the two methods?
49769How is the starting lever operated?
49769How is the tangent galvanometer constructed to give direct readings?
49769How long does it take to start a motor?
49769How may correct readings be obtained?
49769How may it be ascertained which coil is reversed?
49769How may such sparking be reduced without stopping the machine?
49769How may the field magnets become heated?
49769How may the range be increased?
49769How may the tangent galvanometer be used as an ammeter?
49769How much copper or zinc will one ampere deposit in one second?
49769How should a dynamo be started?
49769How should a galvanometer be set up before using?
49769How should a roughened commutator be cleaned and smoothed?
49769How should a series machine be started?
49769How should a shunt or compound machine be started?
49769How should low commutator segments be treated?
49769How should the coil be repaired?
49769How should the plates of a weight voltameter be treated before use?
49769How should the rise of temperature be measured?
49769If a faulty coil can not be quickly repaired and the dynamo be needed, what should be done?
49769If a shunt dynamo will not pick up, what is likely to be the trouble?
49769If the insulation on adjacent conductors has been abraded, how should it be repaired?
49769If the resistance being measured is higher than 6,100 ohms, or lower than 1,100 ohms, how should the commutator plugs be placed?
49769If, in rocking the brushes, a position can not be found at which the sparking disappears, what is the probable cause of the trouble?
49769In connecting a shunt dynamo to the bus bars, must the voltage be carefully adjusted?
49769In starting a shunt dynamo, should the main line switch be closed before the machine is up to voltage or after?
49769In testing cable insulation what is desirable with respect to voltmeter and current?
49769In testing with the Queen Acme set how should the plugs be placed in the commutator?
49769Into what two classes may ammeters be divided?
49769Should the brushes be raised out of contact in starting?
49769Should the commutator be run without any lubricant?
49769State the causes of eddy currents in the pole pieces?
49769Then what is the objection to a reversed dynamo?
49769Upon what does the movement of the needles depend?
49769Upon what does the sensibility depend?
49769Upon what does the sensibility of a tangent galvanometer depend?
49769Upon what does the sensitiveness of the instrument depend?
49769What advantage has the sine galvanometer over the tangent instrument?
49769What are multipliers?
49769What are the causes of excessive current?
49769What are the causes of excessive voltage?
49769What are the causes which produce flats?
49769What are the characteristics of hot wire instruments?
49769What are the conditions at starting in a series motor?
49769What are the effects of operation above the rated voltage and below normal speed?
49769What are the objections to plunger instruments?
49769What are the two methods of coupling dynamos?
49769What attention should be given to the brushes and brush gear?
49769What attention should be given to the brushes?
49769What attention should the machine receive after it has been shut down?
49769What causes breaks in the field circuit?
49769What causes grooves or ridges to be cut in the commutator?
49769What causes this?
49769What determines the mode of connecting ammeters?
49769What disadvantage has the tangent galvanometer?
49769What error is introduced in measuring the pressure of a battery with an ordinary voltmeter?
49769What form of voltameter has been selected to measure the International ampere?
49769What further attention should be given?
49769What happens in case of breaks in the armature coils?
49769What is a galvanoscope and how does it differ from a galvanometer?
49769What is a potentiometer?
49769What is a"sensitive"galvanometer?
49769What is an electro- dynamometer?
49769What is the action of short and long coil galvanometers?
49769What is the action of the motor in the Thompson watt hour meter?
49769What is the advantage of this test?
49769What is the allowable degree of heating?
49769What is the allowable rise of temperature in a well designed machine?
49769What is the difference between a short coil and a long coil galvanometer?
49769What is the difference between a starting box and a speed regulator?
49769What is the difference between a voltmeter and an ammeter?
49769What is the difference between an ampere and a coulomb?
49769What is the difference between these two classes of voltameter?
49769What is the difference between"plug out"and"plug in"types of resistance box?
49769What is the effect of a short circuit in the field coils or field circuit?
49769What is the effect of flats on the commutator?
49769What is the effect of hot bearings?
49769What is the effect of short circuits in the armature?
49769What is the effect of the equalizer?
49769What is the indication of excessive voltage?
49769What is the indication of insufficient lubrication?
49769What is the indication of short circuits in the field coils?
49769What is the indication that the connections between the field coils and armature are reversed?
49769What is the meaning of"Inf.,"marked on the bridge?
49769What is the method of comparing currents?
49769What is the objection to the scale with tangent values?
49769What is the position of instability?
49769What is the principle of electrostatic instruments?
49769What is the principle of the hot wire instrument?
49769What is the special use of the differential galvanometer?
49769What is the value of d?
49769What is the value of the International ampere as measured with the silver voltameter?
49769What is understood by the term"build up"?
49769What kind of adjustable resistance is used in making the above test?
49769What kind of dynamo is affected by breaks in the external circuit?
49769What kind of oil can should be used in filling the reservoir, or oil cups?
49769What kind of oil should be used on the commutator?
49769What kind of oil should be used on the commutator?
49769What may be said with respect to coupling two or more plain series dynamos in parallel?
49769What may be said with respect to excessive current?
49769What may be said with respect to excessive field current?
49769What may be said with respect to reversal of polarity of dynamos?
49769What may be said with respect to the current used?
49769What may be said with respect to the differential galvanometer method?
49769What may be said with respect to the lead of the brushes?
49769What may be substituted for the voltmeter?
49769What name is given to the swing of a ballistic galvanometer needle?
49769What name is given to this method of testing?
49769What other advantages are gained with the decade arrangement?
49769What parts of a dynamo are specially liable to be short circuited?
49769What precaution must be taken in reducing the current?
49769What precaution should be taken in making the test?
49769What precaution should be taken with inductive resistances?
49769What precaution should be taken with new dynamos?
49769What precaution should be taken with the brush holders?
49769What provision is made so that the magnetizing current will have time to reach its normal value?
49769What provision is made to facilitate the correct setting of the brushes?
49769What provision is made to obviate this danger?
49769What provision is made to overcome the arc when the circuit is opened?
49769What provision is made to prevent reversal before bringing the controller lever to the"off"position?
49769What should be done after adjusting the brushes to their correct positions upon the commutator?
49769What should be done if a dynamo become reversed by a reversal of its field magnetism due to lightning, short circuit, or otherwise?
49769What should be done if carbon brushes become hotter than the other parts?
49769What should be done if it be suspected that the failure to excite arises from this cause?
49769What should be done if the brushes begin to spark excessively?
49769What should be done if the current be excessive?
49769What should be done if the machine do not build, and it be suspected that the fault is due to short circuited armature coils?
49769What should be done if the odor of overheated insulation, paint or varnish be noticeable?
49769What should be done in case of flats?
49769What should be done in case of high segments?
49769What should be noted with respect to connecting one dynamo to another?
49769What trouble is encountered with eddy currents?
49769What trouble is liable to be encountered in operating after cutting out a coil?
49769What trouble is likely to occur when the armature is not centered in the armature chamber?
49769What troubles are encountered with short circuits in the armature or commutator?
49769What two kinds of coil are used?
49769What two kinds of sparking may be generally distinguished?
49769What will be the result if the connections of some of the field coils of a dynamo be reversed?
49769What will happen with an overheated commutator?
49769When a dynamo loses its residual magnetism, how can it be made to build up?
49769When is this galvanometer called"dead beat"?
49769Where is a break likely to occur in a shunt machine?
49769Which of the contacts should receive special attention?
49769Why does a shunt machine pick up more slowly if the main switch be closed first?
49769Why does the instrument not give accurate readings for large deflections?
49769Why is a high resistance coil used with a voltmeter?
49769Why is this necessary?
49769Why is this?
49769Why should the battery key be depressed before the galvanometer key?
49769Will a dynamo build up if it become reversed?
49769With what pressure should the brushes bear against the commutator?