Examkin

Soru

Zorluk: OrtaSwitches and Relays

Electromechanical relays and manual switches use specific contact arrangements to govern how electrical circuits open, close, and divert current under various operating states. Which of the following correctly pairs each switch configuration or relay contact state on the left with its functional definition on the right?

  • Normally Open (NO) Relay ContactRemains open to block current when de-energized, closing to complete the circuit only when the coil is energized.
  • Normally Closed (NC) Relay ContactMaintains continuity in the unpowered resting state and opens to interrupt current when the relay coil is energized.
  • Single-Pole, Double-Throw (SPDT) SwitchRoutes current from a single common input terminal to either of two separate output paths depending on the actuator position.
  • Double-Pole, Single-Throw (DPST) SwitchSimultaneously opens or closes two separate, electrically isolated circuits using a single mechanical actuator.

Cevap

The correct pairings are: Normally Open (NO) Relay Contact matches with 'Remains open to block current when de-energized, closing to complete the circuit only when the coil is energized'; Normally Closed (NC) Relay Contact matches with 'Maintains continuity in the unpowered resting state and opens to interrupt current when the relay coil is energized'; Single-Pole, Double-Throw (SPDT) Switch matches with 'Routes current from a single common input terminal to either of two separate output paths depending on the actuator position'; and Double-Pole, Single-Throw (DPST) Switch matches with 'Simultaneously opens or closes two separate, electrically isolated circuits using a single mechanical actuator'.
Each contact type is paired based on standard electrical conventions: Normally Open contacts require coil excitation to establish continuity; Normally Closed contacts conduct by default until coil energization breaks continuity; SPDT switches route one source line between two alternate destinations; and DPST switches control two isolated lines in tandem.

Adım Adım Çözüm

1
Analyze the Normally Open (NO) relay contact behavior.
Identified as an open circuit in the resting state that closes upon coil energization.
'Normal' in relay terminology denotes the de-energized or unpowered coil state; thus, an NO contact remains disconnected until magnetic attraction pulls the contacts shut.
2
Analyze the Normally Closed (NC) relay contact behavior.
Identified as a closed circuit in the resting state that opens when the coil is energized.
An NC contact provides continuous circuit conduction until an energized coil generates a magnetic field that pulls the armature away to break continuity.
3
Evaluate the Single-Pole, Double-Throw (SPDT) switch configuration.
Identified as one input pole with two selectable throw positions.
'Single-Pole' means one circuit path is controlled; 'Double-Throw' means the common terminal can connect to either of two output load contacts.
4
Evaluate the Double-Pole, Single-Throw (DPST) switch configuration.
Identified as two electrically isolated circuit poles that simultaneously turn on or off.
'Double-Pole' designates two separate conductive lines controlled by a unified toggle/actuator; 'Single-Throw' indicates simple open/closed switching for both.

Anahtar Kavram

Switch pole/throw nomenclature and electromechanical relay contact states
Tahmini Süre:1m 0s
Bu soruyu puanla

Konular

Switches and Relays

Bu konudan daha fazla soru