D 12.4 An emitter follower using the circuit of Fig. 12.3,for which the output voltage range is ±5 V, is required usingVcc = 10 V. The circuit is to be designed such that the currentvariation in the emitter-follower transistor is no greater thana factor of 10, for load resistances as low as 100Q. What isthe value of R required? Find the incremental voltage gain ofthe resulting follower at vo = +5, 0, and -5 V, with a 100-Qload. What is the percentage change in gain over this rangeof v0?

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

Machinery that is a key part of the process and without which the plant or process cannot function is classifed as: (clo4) a)-critical machinery b)-essential machinery c)-general purpose machinery d)-none of the specified options.

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero