## Draw the schematic symbol of the SCR, UJT, Diac, Triac, and IGBT.

Draw the schematic symbol of the SCR, UJT, Diac, Triac, and IGBT. Explain the characteristics and the operation of SCRs, UJTs, Diacs, Triacs, and IGBTs. Draw the current–voltage characteristic curve for an SCR, a UJT, a Diac, and a Triac. Describe ways in which voltages at the leads of SCRs, UJTs, Diacs, Triacs, and IGBTs turn them on and off. Draw the waveforms produced at the output of SCRs, UJTs, Diacs, and Triacs when various voltages are applied to their inputs. Describe the operation of various sample circuits that have SCRs, UJTs, Diacs, and Triacs.

### design suitable bearings to support the load for at least 5E8 cycles at 1 200 rpm using deepgroove ball bearings.

The shaft shown in Figure P11-4 was designed in Problem 10-19. For the data in row (a) of Table P11-1, and the corresponding diameter of shaft found in Problem 10-19,….

### Find the minimum film thickness for a long bearing with the following data: 30-mm dia, 130 mm long, 0.0015 clearance ratio, 1 500 rpm, ISO VG 100 oil at 200°F, and supporting a load of 7 kN.

1.       A paper machine processes rolls of paper having a density of 984 kg/m3. The paper roll is 1.50-m OD X 22-cm ID X 3.23-m long and is on a simply supported, 22-cm OD, steel….

### Find the minimum film thickness for a bearing with these data: 30-mm dia, 25 mm long, 0.0015 clearance ratio, 1 500 rpm, ON = 30, ISO VG 220 oil at 200°F.

1.       Problem 7-12 estimated the volume of adhesive wear to expect from a steel shaft of 40 mm dia rotating at 250 rpm for 10 years in a plain bronze….