11.18 An operational amplifier has a de open-loop gain of100 dB and a uniform —20 dB/decade gain rolloff with a3-dB frequency of 100 Hz. Find the amount of feedbackand the feedback factor required to obtain the following declosed-loop gains. In each case specify the 3-dB frequency ofthe feedback amplifier and the gain-bandwidth product.(a) 60 dB; (b) 40 dB; (c) 20 dB; and (d) 0 dB.

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Fluids at rest possess no flow energy. a)- true b)- false

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.