In order for a 555 timer to produce a duty cycle of less than 50 %
A) it must have a diode connected between the reset and trigger terminals
B) the capacitor must be larger than the resistor in the timing circuit
C) it must have a diode connected between the discharge and trigger terminals
D) the resistor must be larger than the capacitor in the timing circuit
C
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Which of the statements A–D is false?
A. Internal energy is a state function, while heat and work are not state functions. B. If we write “?H = MCP?T”, we are assuming that the heat capacity is constant. C. If we write “dH = MCPdT”, we are assuming either that the pressure of the system is constant or that enthalpy is independent of pressure. D. When Q or W is positive, this means that either heat is added to the system (Q> 0 ) or work is done on the system (W> 0), according to the sign convention in this book. E. None of these are false.
Each automotive battery cell has an electrical potential of how many volts?
A) 12.6 V B) 1.5 V C) 2.1 V D) None of these
What happens to the pressure as you move up or down along a constant enthalpy line?
A) The pressure remains the same. B) The pressure decreases as you move up. C) The pressure is not related to vertical movement along the constant enthalpy line. D) The pressure decreases as you move down.
On a package air conditioning system, which refrigerant lines must be field installed?
A. discharge and suction B. liquid and suction C. discharge and liquid D. No lines need to be installed.