To prevent motor overload during start-up of a centrifugal refrigeration system, what is true concerning the compressor suction gas variable inlet guide vanes?

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closed until the motor is connected across the line at full voltage and current drawn is below full load current

Answer

opened until the motor is connected across the line at full voltage and current drawn is up to full load current

Answer

closed until the motor is connected across the line at full voltage and current drawn is up to full load current

Answer

opened until the motor is connected across the line at full voltage and current drawn is below full load current

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