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Digital transistor-to-transistor logic (TTL) signals use voltage levels between 0 and 0.4 V to represent binary 0 and voltage levels between 2.4 and 5 V to represent binary 1. Develop a simple circuit that uses a BJT to switch on and off an LED using a TTL trigger at these digital voltage levels. Assume that the LED resistance is 10 Ω and the current required by the LED to generate the required brightness is close to (but not more than) 40 mA. Also assume that an npn BJT and a 10 V dc power supply are available. Also, a current limiting resistor of 20 kΩ is available for the base of the BJT and a resistor of 200 Ω is available in series with the power supply and the LED. Indicate a practical application of this device.
a piston-cylinder device contains 5 kg of refrigerant-134a at 0.7 mpa and 60 degrees c. the refrigerant is now cooled
five kg of water contained in a piston cylinder assembly expand from an initial state where t1400 degree celsius p1700
an ideal gas is heated from 50 c to 80 c a at constant volume and b at constant pressure. for which case do you think
a 4 cylinder 4 stroke spark ignition engine is running at 2600rpm. the processes in each cylinder are air-standard otto
a 4-ft concrete post is reinforced with four steel bars each with a 34 in. diameter. knowing that e of steel 29x106 psi
A rigid tank of 1 m3 contains nitrogen gas at 600 kPa, 400 K. By mistake someone lets 0.5 kg flow out. If the final temperature is 375 K what is then the final pressure?
What are the corresponding wavenumbers of these frequencies?
saturated water vapor at 200 kpa is expanded slowly and without friction i.e. internally reversibly and isothermally in
A helmet has an open cell polystyrene foam liner that is design to absorb the kinetic energy from an impact. The Foam has a relative density of 10% and the young module of the solid polystyrene that the foam is 1.5Gpa. How much energy per volume in J..
Write the form of the heat equation and the boundary/ initial conditions that determine the variation of temperature with position and time, T(x, t), in the pan bottom during Stage 1. Express your result in terms of the parameters qo, D, L, h, and T..
A car having a mass of 5500 kg is pulled slowly up a steep inclined track by a steel cable (see figure). The cable has an effective cross-sectional area of 320 mm2, and the angle of the incline is 310.
consider an ideal gas-turbine cycle with two stages of compression and two stages of expansion. the pressure ratio
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