Worksheet 5-6 Electromagnetic Devices

Electric ranges, air conditioners, and furnaces require 220 V, 60 Hz AC. Therefore, compared with most household appliances, they require which of the following? a. A higher electric potential b. A higher operating frequency c. A lower electric potential d. Greater conductivity e. Greater semiconductivity

a. A higher electric potential

The electric current produced by an AC generator has: a. Alternating positive and negative intensity b. Constant negative intensity c. Constant positive intensity d. Pulsating negative intensity e. Pulsating positive intensity

a. Alternating positive and negative intensity

In an electric generator: a. coil of wire is rotated in a magnetic field. b. A transformer is charged, c. Alternating current (AC) is changed to direct current (DC). d. Chemical energy is converted to electrical energy é. Electrical energy is converted to mechanical energy

a. coil of wire is rotated in a magnetic field.

A fluoroscope is operated at 95 kVp, 2 mA. What is its power consumption? a. 47.5 W b. 190 W c. 47,5 kW d. 97 kW e. 190 kW

b. 190 W

What power is required for a radiographic exposure at 76 kVp, 500 mA? a. 19 W b. 38W c. 576 W d. 19 kW c. 38 kW

b. 38W

How much current will a 60 W lightbulb draw from a 120 V receptacle? a. 60 mA b. 500 mA c. lA d. 15 A c. 120 A

b. 500 mA

In an induction motor, the only part to be rotated is the: a. Cathode b. Electromagnet c. Rotor d. Stator e. Wire loop

c. Rotor

A 110 V heater requires 15 A. What is the power consumption? a. 15 W b. 110 W c. 125 W d. 1650 W e. 1800 W

d. 1650 W

An induction motor is used in an X-ray imaging system to: a. Control current b. Measure mAs c. Provide rectification d. Rotate the anode e. Vary voltage

d. Rotate the anode

In an electric motor: a. A coil of wire is mechanically rotated. b. A commutator ring is not necessary. c. AC is changed to DC. d. A transformer is discharged. e. Electric current is supplied to a coil of wire.

e. Electric current is supplied to a coil of wire.