Technician A says that in order for a technician to diagnose an electrical problem, he must first test the system to determine which part is malfunctioning. Technician B says that a good digital multimeter must have high input impedance. Who is correct?

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2

Aload of 10kn is to be suddenly applied to the free end of a vertical rod of length 500 mm, the upper end being rigidly fixed. 190 mechanical science what should the diameter of the rod be if the maximum stress in the rod is not to exceed 100 mpa? the tensile modulus of the rod is 205 gpa.

Amachine of mass 140 kg is mounted on springs of stiffness 1.4x10° n/m and in parallel witha viscous damper of unknown damping coefficient. the machine is subject to a harmonic excitation of 200sin150t n. the phase angle is measured as 2.58 rad. what is the damping coefficient of the viscous damper?