单选题 8235. In magnetic particle inspection, a flaw that is perpendicular to the magnetic field flux lines generally causes

A、 A) A large disruption in the magnetic field.

B、 B) A minimal disruption in the magnetic field.

C、 C) No disruption in the magnetic field.

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相关试题

单选题 8008. The amount of electricity a capacitor can store is directly proportional to the

A、A) Distance between the plates and inversely proportional to the plate area.

B、B) Plate area and is not affected by the distance between the plates.

C、C) Plate area and inversely proportional to the distance between the plates.

单选题 8010. Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be

A、A) Maximum values

B、B) Effective values

C、C) Instantaneous values

单选题 8002. The term that describes the combined resistive forces in an ac circuit is

A、A) Impedance;

B、B) Resistance

C、C) Reactance

单选题 8004. The opposition offered by a coil to the flow of alternating current is called (disregard resistance)

A、A) Impedance.

B、B) Reluctance.

C、C) Inductive reactance.

单选题 8001.The working voltage of a capacitor in an arc circuit should be

A、 At least 50% greater than the highest applied voltage;

B、 At least 20% greater than the highest applied voltage;

C、C) Equal to the highest applied voltage.

单选题 8003. The basis for transformer operation in the use of alternating current is mutual

A、A) Inductance

B、B) Capacitance

C、C) Reactance.

单选题 8007. In an ac circuit, the effective voltage is

A、A) Equal to the maximum instantaneous voltage.

B、B) Greater than the maximum instantaneous voltage.

C、C) Less than the maximum instantaneous voltage.

单选题 8005. An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?

A、A) Resistance and capacitive reactance

B、B) Inductance and frequency

C、C) Resistance and voltage