GRADED A+
◉ What is usually done to protect large capacitors during charging?
Answer: A resistor is placed in series with the capacitor
◉ Which of the following do you need to be aware of when using
electrolytic capacitors? Answer: They may be polarity sensitive
◉ Why are bleeder resistors sometimes connected across high voltage
capacitors? Answer: To help drain voltage when power is removed
◉ Which of the following statements is correct when DC is first applied
in an RC circuit? Answer: Capacitor voltage is minimum and current is
minimum
◉ An elevators motor rotates at 1200 rpm at contract speed and is
geared at a ratio of 40:1. If the motor turns 40 rpms the sheave turns 1
rpm. What is the actual speed of the drive sheave in rpms? Answer: 30
rpms
◉ The entire cab assembly, including the car sling, cab doors, operator
etc. weighs 3400lbs. The capacity of the elevator is 2500lbs. The car
must be counterweighted at 40% of capacity plus the weight of the car
assembly. What is the weight of the counterweight assembly Answer:
4400lbs