The ____ contains a coil of a few turns of large wire, and a set of normally open contacts.

a. hot-wire relay
b. current relay
c. potential relay
d. solid-state relay


b. current relay

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A 220 V, dc series motor has an armature current of 86 A, armature resistance of 0.2 ?, and a field resistance of 0.1 ?. The terminal voltage of the motor can be adjusted by means of solid-state devices. Ignore the field saturation.

a. When the motor runs at 600 rpm, the armature current is 20 A. A 0.1 ? resistance is added in shunt to the field windings. If the load torque remains constant, calculate the speed of the motor. b. The resistance in shunt of the field windings is removed. The motor is used to lower the same mechanical torque described in (a) by a countercurrent braking method. The desired speed in the countercurrent braking is 10 rpm. The braking current is twice the rated value. Calculate the armature voltage of the motor.

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____ provide career counseling, give aptitude and ability/interest tests, locate jobs, and arrange job interviews.

A. Magazines B. Newspapers C. Placement offices D. Health departments

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Stratification is a chemical treatment of seed prior to planting

Indicate whether the statement is true or false

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If VR is 10 V and VL is 10 V in a series RL circuit, the source voltage equals ________

A) 10 V B) 14.1 V C) 28.3 V D) 20 V

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