The location for a rooftop unit will be partly determined by
A) the clearest path available for sliding the unit across the roof
B) the easiest place to cut a hole in the roof
C) The distance that a crane can reach over the edge of the building
D) the availability of anchor points for attaching the drag winch
C
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A dc series motor is driving a fan-type load. The armature and field resistances of the motor are 2 ? and 3 ?, respectively. When the terminal voltage of the motor is 200 V, the motor speed is 250 rpm and the armature current is 10 A. Assume that the motor operates at the linear region of the field-current characteristic. Calculate the terminal voltage needed to reduce the motor speed to 100 rpm. Also sketch the speed-torque characteristics and show all operating conditions.
What will be an ideal response?
What is the advantage of battery conductance testing?
What will be an ideal response?
Springs in folding stairs lose tension rapidly when exposed to heat which may cause the stair assembly
A. jam closed under fire conditions. B. barely open, limiting ingress/egress. C. swing down into the structure during a fire. D. collapse completely and fall into the structure.
What is the heart of the DAC interface module?
A) ADC 0804 B) 74LS244 C) 74LS373 D) MC 1408