Rad135 Ch4 Electromagnetism- Part 2 Question Preview (ID: 55289)


This Content Covers Chapter 4 (Electromagnetism- Part 2) From The Text To Help You Prepare For The Midterm Exam In Rad135. TEACHERS: click here for quick copy question ID numbers.

If the primary side of a transformer reads 110 volts and 200 amperes, what will the secondary voltage be if the turns ratio is 900:1? (Turns ratio is Ns/Np)
a) 99 volts
b) 99kV
c) 222 mA
d) 122 volts

A rectifier _______
a) refers to a type of electromagnetic device
b) changes electron flow to current flow
c) converts DC to AC
d) converts AC to DC

Which of the following is TRUE referring to the autotransformer?
a) It has no moving parts
b) It operates via self-induction
c) It has a fixed-ratio transformer
d) The turns ratio rule does not apply to an autotransformer.

Which of the following is TRUE about a capacitor?
a) It consists of two plates with the same charge
b) It is a device capable of accumulating and storing electrical charge
c) It has four moving parts
d) It does not have to be charged to be operable

The design of an x-ray tube requires that electrons flow through it in only one direction. If an alternating current were supplied to the x-ray tube at high voltage without rectification, what would be the result?
a) the radiaion produced would be 1/4
b) radiation would flow from the filament to the cathode
c) the electron flow would destroy the filament and the x-ray tube
d) nothing

The transformer with more secondary windings than primary windings ____.
a) has a greater secondary voltage
b) is a step-down transformer
c) has a greater amperage output than input
d) has a higher power loss

The inherent power loss of electrical conduction through solid wire conductors ____.
a) is minimized with higher voltage transmission
b) has no relationship with current flow
c) results from space charge
d) is lower with current flow rather than electron flow

Conventional current flows ____.
a) from cathode to anode
b) from anode to cathode
c) in either direction
d) in the same direction as electron flow

All of the following are true of transformers except:
a) they have no moving parts
b) the work on the principle of mutual induction
c) they work most efficiently on DC
d) they are designed to regulate voltage with a fixed ratio

The efficiency of a transformer is NOT affected by ____.
a) eddy current loss
b) power loss
c) hysteresis loss
d) the transformer turns ratio

A ____ is a source of direct current.
a) wall outlet
b) battery
c) AC generator
d) spark

A stator consists of: ____.
a) bars of copper around an iron core
b) commutator rings
c) a rotor
d) electromagnets

Alternating current is produced by a ____.
a) battery
b) motor
c) capacitor
d) generator

An electrical potential applied to a conductor produces a(n): ____.
a) electrical current
b) magnetic field
c) charged insulator
d) both a and b

Which of the following is FALSE concerning electromagnetic energies?
a) they are illustrated as sinusoidal waves
b) they possess both wave and particle characteristics
c) the relationship between frequency and wavelength is direct and proportional
d) they are arranged in an orderly spectrum according to frequency and wavelength

Which equation is the transfomer law, expressing the direct relationship between number of turns in the coil and voltage?
a) Vs / Vp = Ns/ Np
b) I2R
c) E = mc^2
d) V = I x R

Which of the following does not contribute to transformer inefficiencies?
a) I2R loss
b) hysteresis loss
c) eddy current loss
d) mutual induction

Which is false regarding capacitors?
a) accumulates and stores a charge
b) composed of two oppositely charged metal plates
c) supplies direct current
d) includes an autotransformer in its configuration

Solid-state diodes...
a) use p-n junction semiconductors
b) are charged by mutual induction
c) convert DC to AC
d) are used as a target material

Which is false regarding motors?
a) DC motors have commutator (split) rings
b) AC motors have slip rings
c) Induction motors have a rotor and a stator
d) photons are produced within the motor housing

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