20. Of these four materials used as a dielectric, which is the best insulator?

a. Pure water

C. Glass

b. Petroleum

d. Air

In a steam power plant, energy is added by heat transfer at a rate of 2100 kW at 680◦C at the boiler, removed at a rate of 1240 kW at 35◦C at the condenser, and the pump power is 75 kW. Determine: a. thermal efficiency of power plant b.

Convert 0.025 in into mm.

Block B starts from rest and moves downward with a constant acceleration. Knowing that after slider block A has moved 400 mm its velocity is 4 m/s, determine (a) the accelerations of A and B, (b) the velocity and the change in position of B after 2

Nitrate salts (NO3-), when heated, can produce nitrites (NO2-) plus oxygen (O2). A sample of potassium nitrate is heated, and the O2 gas produced is collected in a 720 mL flask. The pressure of the gas in the flask is 2.

Select all of the true statements. A. Diodes are used in voltage regulators and limiters. B. Different diode models are used to replace the real diode with a simpler version that approximates the i-v characteristics of the real diode. C.

7 Single-use earplugs require a professional fitting before they can be used. A True B) False

Electric power is to be generated by installing a hydraulic turbine-generator at a site 138 m below the free surface of a large water reservoir that can supply water at a rate of 2400 kg/s steadily. Determine the power generation potential.

When the French horn plays with brass instruments, then it is played very softly to match the texture. True/False

You're running an engine and seeing that it is exhausting blue smoke. Which is likely to be the problem?

To do a research, a researcher needs to be clear about what he/she is doing, why he/she is doing it and the associated implications of what he/she is about to do. A. True B. False