Site MapHelpFeedbackPractice Test
Practice Test
(See related pages)





1Inductance is the ability of a conductor to produce induced current when the voltage varies.
A)True
B)False


2The base unit for inductance is the henry.
A)True
B)False


3Induced voltage is the result of flux cutting across a conductor.
A)True
B)False


4One maxwell is the amount of inductance that allows one volt to be induced when the current changes at the rate of one ampere per second.
A)True
B)False


5Too much current flowing through a coil will reduce its permeability and inductance.
A)True
B)False


6A steady dc current cannot induce a voltage in a coil.
A)True
B)False


7A typical air-core rf inductor is called a condenser.
A)True
B)False


8An induced voltage across a coil is actually the result of inducing electrons to move in a conductor; so that there is an induced current.
A)True
B)False


9Inductance is the characteristic that opposes any change in current.
A)True
B)False


10The ability of one coil to induce a voltage in another coil nearby is referred to as inductance.


11The unit of mutual inductance is the .


12The ratio of the number of turns in the primary to the number in the secondary is the ratio.


13An advantage of using a transformer with a separate winding secondary is electrical .


14The unit of apparent power is .


15The dc resistance between the primary and secondary windings of a transformer should always measure Ω.


16Wire-wound resistors have enough to be evident at radio frequencies.


17Air-core coils are used in circuits because higher frequencies need less inductance for the required inductive effect.


18For two coils with mutual inductance, any magnetic lines that do not link the two coils result in
A)shielded coil inductance
B)non-mutual flux
C)leakage flux
D)magnetic misfire


19The fraction of total flux from one coil linking another coil is the
A)flux ratio
B)linking ratio
C)percentage of linking
D)coefficient of coupling


20What is the mutual inductance for two 400-mH coils L1 and L2 that have a coefficient of coupling of 0.3?
A)80 mH
B)12 mH
C)120 mH
D)1.2 H


21What component uses mutual inductance to step up or step down an alternating voltage?
A)inductor
B)capacitor
C)resistor
D)transformer


22With zero losses assumed for the transformer, the power in the secondary
A)is always more than the primary
B)is always less than the primary
C)is equal to the power in the primary
D)is equal to IS times RS


23Which of the following is not an advantage of using an autotransformer?
A)compact
B)efficient
C)cost less
D)provide electrical isolation


24The amount of power the transformer can deliver to a resistive load is called
A)transformer power
B)actual power
C)apparent power
D)secondary power


25What is it called when a transformer is used to achieve maximum transfer of power from a generator to a load when the generator and load impedances are not the same?
A)maximum power transfer
B)power matching
C)impedance matching
D)maximum loading





To learn more about the book this website supports, please visit its Information Center.
(c)2007 McGraw-Hill Higher Education
Any use is subject to the Terms of Use and Privacy Notice.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.


Grob's Basic ElectronicsOnline Learning Center

Home > Chapter 19 > Practice Test