Electrical Engineering Testing: A Practical Work for Second and Third Year Students, Engineers and Others |
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Page 8
... weights as given in the table of constants ( p . 360 ) , so that the maximum current to be measured on A would give a reading on K.B. as nearly right across the scale as possible . ( 3 ) With R as large as possible close S and obtain ...
... weights as given in the table of constants ( p . 360 ) , so that the maximum current to be measured on A would give a reading on K.B. as nearly right across the scale as possible . ( 3 ) With R as large as possible close S and obtain ...
Page 9
... weights as given in the table of constants ( p . 361 ) so that the maximum current to be measured on A would produce as nearly as possible a full scale reading on K.B. ( 4 ) With r at its maximum close S , and adjust the current through ...
... weights as given in the table of constants ( p . 361 ) so that the maximum current to be measured on A would produce as nearly as possible a full scale reading on K.B. ( 4 ) With r at its maximum close S , and adjust the current through ...
Page 15
... weights ( W1 ) grams . ( 5 ) Insert the same area of trial plate to act as cathode , so as to adjust the current to ... Weight of plates in grams . Deposit W = ( W2 - W1 ) Time in Secs . Reading of ( t ) A. Temperature of Bath = . True ...
... weights ( W1 ) grams . ( 5 ) Insert the same area of trial plate to act as cathode , so as to adjust the current to ... Weight of plates in grams . Deposit W = ( W2 - W1 ) Time in Secs . Reading of ( t ) A. Temperature of Bath = . True ...
Page 21
... weights as given in the table of constants ( p . 360 ) , so that the maximum voltage to be measured on V would produce as nearly as possible a full scale reading on K.B. ( 4 ) With R as large as it can be , close S , and obtain about th ...
... weights as given in the table of constants ( p . 360 ) , so that the maximum voltage to be measured on V would produce as nearly as possible a full scale reading on K.B. ( 4 ) With R as large as it can be , close S , and obtain about th ...
Page 36
... weights as given in the table of constants ( p . 362 ) , so that the maximum Watts to be measured on W would give , as nearly as possible , a full scale reading on K.B. ( 5 ) With R1 fairly large , close S1 and adjust the voltage as ...
... weights as given in the table of constants ( p . 362 ) , so that the maximum Watts to be measured on W would give , as nearly as possible , a full scale reading on K.B. ( 5 ) With R1 fairly large , close S1 and adjust the voltage as ...
Other editions - View all
Electrical Engineering Testing: A Practical Work for Second and Third Year ... George Dudley Aspinall Parr No preview available - 2018 |
Electrical Engineering Testing: A Practical Work for Second and Third Year ... George Dudley Aspinall Parr No preview available - 2017 |
Electrical Engineering Testing: A Practical Work for Second and Third Year ... George Dudley Aspinall Parr No preview available - 2018 |
Common terms and phrases
abscissæ accurate alternating current ammeter amperes Amps angle Apparatus arc lamp armature balance battery brake brushes cable calculated calibrated capacity carbon cell centre circuit Clark cell conductor connected constant convenient copper copper losses curve deflection diagram direct current dynamo dynamometer efficiency electrical electrostatic engine equal error exciting current external field magnets fixed frequency full load galvanometer give indicator inductive Inferences insulation resistance joint lamp Leclanché cells light losses low resistance machine maximum means measured megohms meter method motor movable moving coil needle non-inductive Note obtained ohms ordinates plates Plot position potential potentiometer pressure pulley R₁ R₂ reading Repeat results as follows rheostat scale secondary self-induction shown in Fig shunt solder speed standard switch tabulate your results temperature terminals tested transformer true power turns V₁ V₂ voltage voltmeter volts W₁ Wattmeter Watts weight Wheatstone Bridge wire
Popular passages
Page 322 - Then insert the cork and zinc rod, passing the glass tube through the hole prepared for it. Push the cork gently down until its lower surface is nearly in contact with the liquid. The air will thus be nearly all expelled, and the cell should be left in this condition for at least twenty-four hours before sealing, which should be done as follows.
Page 320 - Prepare a neutral saturated solution of pure ("pure recrystallised ") zinc sulphate by mixing in a flask distilled water with nearly twice its weight of crystals of pure zinc sulphate, and adding zinc oxide in the proportion of about 2 per cent, by weight of the zinc sulphate crystals to neutralise any free acid. The crystals should be dissolved with the aid of gentle heat, but the temperature to which the solution is raised should not exceed 30° C.
Page 321 - O'5 cm. thick to fit the tube ; at one side of the cork bore a hole through which the zinc rod can pass tightly ; at the other side bore another hole for the glass tube which covers the platinum wire ; at the edge of the cork cut a nick through which the air can pass when the cork is pushed into the tube.
Page 321 - ... taking care that the whole of the exposed platinum is covered. Shake up the paste and introduce it without contact with the upper part of the walls of the test tube, filling the tube above the mercury to a depth of rather more than 1 centimetre.
Page 320 - ... carefully removing any loose pieces of the zinc. Just before making up the cell dip the zinc into dilute sulphuric acid, wash with distilled water, and dry with a clean cloth or filter paper. 3. The mercurous sulphate.
Page 354 - ... scale shows, approximately enough for most purposes, the strength of the current ; the notches in the top of the aluminium scale show the precise position of the weight corresponding to each of the numbered divisions on the fixed scale, which practically annuls error of parallax due to the position of the eye. When the pointer is not exactly below one of the notches corresponding to integral divisions of the inspectional scale, the proportion of the space on each side to the space between two...
Page 415 - The whole instrument, as said above, rests on three vulcanite legs attached to the base plate of system A ; and two terminals are provided, one, i, on the base of system A, and the other, j, on the end of one of the corner bolts of system B. The air leyden which has been thus described is used as a standard of electrostatic capacity.
Page 320 - Take mercurous sulphate, purchased as pure, and wash it thoroughly with cold distilled water by agitation in a bottle ; drain off the water, and repeat the process at least twice.
Page 321 - Keep the paste for an hour at this temperature, agitating it from time to time, then allow it to cool ; continue to shake it occasionally while it is cooling. Crystals of zinc sulphate should then be distinctly visible, and should be distributed throughout the mass ; if this is not the case, add more crystals from the stock bottle, and repeat the whole process. This method ensures the formation of a saturated solution of zinc and mercurous sulphates in water.
Page 366 - ... plates and situated midway between them. The upper end of this movable plate has a fine prolongation which serves as a pointer for indicating the deflections on the scale of the instrument, and at its lower end is fixed a knife edge having its length perpendicular to the plane in which the plate moves. When the fixed and movable plates are connected respectively to two points of an electric circuit between which there exists a difference of potential, the movable plate tends to move so as to...