In the USA, peak value of the AC voltage is around 175 V and the frequency is 60 Hz.

1. Find the numerical value of the RMS voltage for 60 Hz frequency.

2. Find the numerical value of the RMS voltage if the frequency is changed to 20 Hz?

3. Find the numerical value of the RMS voltage if the frequency is changed to 120 Hz?

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false