# Electronics

150 Questions | Total Attempts: 98

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This quiz covers Feedback, FET, Thyristor, Diode Circuit, Semiconductor Diode,Oscillator,Filters and other Electronics Device.

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• 1.
A memory circuit has 9 address inputs has how many storage locations?
• A.

A. 255

• B.

B. 256

• C.

C. 512

• D.

D. 511

• 2.
The_______is ultraviolet light erasable and electrically programmable
• A.

A. ROM

• B.

B. RAM

• C.

C. PROM

• D.

D. EPROM

• 3.
The fan out of a 7400 NAND gate is
• A.

A. 2 TTL

• B.

B. 5 TTL

• C.

C. 8 TTL

• D.

D. 10 TTL

• 4.
There are no transients in pure resistive circuits because they
• A.

A. Offer high resistance

• B.

B. Obey Ohm’s Law

• C.

C. Are linear circuits

• D.

D. Have no stored energy

• 5.
The relation of the voltage across an inductor to its current is described as
• A.

A. leading the current by 90 degrees

• B.

B. lagging the current by 90 degrees

• C.

C. leading the current by 180 degrees

• D.

D. in phase with the current

• 6.
Term used for the out of phase, non-productive power associated with inductors and capacitors
• A.

A. Effective power

• B.

B. True power

• C.

C. Reactive power

• D.

D. Peak envelope power

• 7.
How many nodes are needed to completely analyze a circuit according to Kirchoffs Current Law
• A.

A. One

• B.

B. Two

• C.

C. All nodes in the circuit

• D.

One less than the total number of nodes in the circuit One less than the total number of nodes in the circuit One less than the total number of nodes in the circuit One less than the total number of nodes in the circuit One less than the total number of nodes in the circuit d. one less than the # of nodes

• 8.
The voltage applied in DC circuit having a power of 36 watts and a total resistance of 4 ohms.
• A.

A. 6 V

• B.

B. 9 V

• C.

C. 12 V

• D.

D. 24 V

• 9.
What is another term for magnetic lines of force?
• A.

A. Flux

• B.

B. Magnetic pole

• C.

C. Armature

• D.

D. Lodestone

• 10.
What is the law that determines polarity of an induced voltage?
• A.

A. Norton’s law

• B.

B. Thevenin’s law

• C.

C. Lenz’s law

• D.

• 11.
What is the unit of magnetic flux in SI system?
• A.

A. Weber

• B.

B. Maxwell

• C.

C. Tesla

• D.

D. Gauss d. Gauss

• 12.
Which material has more free electrons?
• A.

A. Mica

• B.

B. Dielectric

• C.

C. Insulators

• D.

D. Conductor

• 13.
Which of the following is not a good conductor of electricity
• A.

A. Silver

• B.

B. Copper

• C.

C. Aluminum

• D.

D. Mica

• 14.
A rheostat is a device that regulates the strength of an electric current by
• A.

A. Increasing the magnetic field in the circuit

• B.

B. Varying the voltage in the circuit

• C.

C. Varying the resistance in the circuit

• D.

D. Varying the current in the circuit

• 15.
Materials with permeabilities slightly less than that of free space are referred to as
• A.

A. Diamagnetic

• B.

B. Ferromagnetic

• C.

C. Non-magnetic

• D.

D. Paramagnetic

• 16.
Inserting a soft iron core into a coil has what effect on the inductance of the coil?
• A.

A. Increase inductance

• B.

B. Decrease inductance

• C.

C. Does not affect the inductance

• D.

D. None of these

• 17.
The following are the factors that affect the inductance of a coil 1.      The number of turns in a coil 2.      The diameter of a coil 3.      The coil length 4.      The number of layers of windings in the coil 5.      The type of core material
• A.

A. 1,2,3 and 4 only

• B.

B. 1,2,3 and 5 only

• C.

C. 1,2,3,4 and 5

• D.

D. 1,2,4 and 5 only

• 18.
What law in electronics where an induced current will be in such a direction that its own magnetic field will oppose the magnetic field that produces the same?
• A.

A. Electromagnetic law

• B.

B. Norton’s law

• C.

C. Lenz’s law

• D.

D. Maxwell’s law

• 19.
Which of the following characterizes inductance?
• A.

A. Tends to oppose DC

• B.

B. Tends to oppose change in current

• C.

C. Tends to oppose change in voltage

• D.

D. Opposes all frequencies equally

• 20.
The natural magnet refers to
• A.

A. Steel

• B.

B. Soft iron c. Magnesia b. Soft iron c. Magnesia b. Soft iron

• C.

C. Magnesia

• D.

D. Lodestone

• 21.
It is the air space between poles of magnet .
• A.

A. Air gap

• B.

B. Vacuum

• C.

C. Free zone

• D.

D. Free space

• 22.
What is the law whereby the attraction or repulsion between two magnetic poles is directly proportional to their strength?
• A.

A. Coulomb’s law

• B.

B. Newton’s law

• C.

C. Coulomb’s first law

• D.

D. Norton’s law

• 23.
When you demagnetize properly by applying an AC field and then gradually reduced it to zero, it is called______
• A.

A. Damping

• B.

B. Decaying

• C.

C. Degaussing

• D.

D. Gaussing

• 24.
What is the flux density in gauss (G) having a flux of 12,000 Mx through a perpendicular area of 6 cm squared?
• A.

A. 2000 G

• B.

B. 72000 G

• C.

C. 72 G

• D.

D. 200 G

• 25.
A magnet that is heated will _____
• A.

A. Increase in magnetism

• B.

B. Decrease in magnetism

• C.

C. Not change in magnetism

• D.

D. Become demagnetized