An automotive alternator is rated 500 VA and 20 V. It delivers its rated voltamperes at a power factor of 0.85. The resistance per phase is 0.05 Q, and the field takes 2 A at 12 V. If the friction and windage loss is 25 W and the core loss is 30 W, calculate the percent efficiency under rated conditions.
14.43 A non–salient pole, Y-connected, three-phase, two-pole synchronous machine has a synchronous reactance of 7 Q and negligible resistance and rotational losses. One point on the open-circuit characteristic is given by Vo = 400 V (phase voltage) for a field current of 3.32 A. The machine is to be
operated as a motor, with a terminal voltage of 400 V (phase voltage). The armature current is 50 A, with power factor 0.85, leading. Determine Eb, field current, torque developed, and power angle δ.
A company examined its cash management policy and found that It takes an average of five days for checks that the company writes to reach its bank and thus to be deducted...Sep 08 2020
People are ready to work at current or slightly lower wage rate but don't find a job is known as. yet wered -ked out of (2 Flag question Technological unemployment Volunt...Apr 02 2021
Which of the graphs in Figure 12.1 is consistent with a short-run equilibrium model where prices are variable?a.Ab.Bc.Cd.De.None of these52.Which of the graphs in Figure ...Dec 16 2019
In terms of pricing decisions, full responsibility for pricing decisions should be delegated to the managers of various national subsidiaries, thereby reaping the benefit...Jan 11 2020
Copa Company, a manufacturer of stereo systems, started itsproduction in October 2008. For the preceding 3 years Copa had beena retailer of stereo systems. After a thorou...May 19 2018
Receivables are: Answer a. One of the most liquid assets and thus are always considered current assets. b. Claims that are expected to be collected in cash. c. ...Jun 08 2018
Observations of consumer behavior suggest that when the price of gasoline rose above $3.50 per gallon, consumer demand for gas became considerably more price elastic.64) ...Dec 07 2019
Determine the differential equation of motion of the 15-kg spool. Assume that it does not slip at the surface of contact as it oscillates. The radius of gyration of the s...Jun 03 2020
An adjusted trial balance a. Shows the ending balances in a debit and credit format before posting the adjusting journal entries. b. Is prepared after closing entries ...Aug 25 2020
Water vapor exits and Co2 enters a leaf through the (A) Stomata (B) Grana (C) Porphyrin rings (D) Photons (E) StromaMar 13 2018