It's been a while since VU3PLP came up with the next set of electronics quiz for you to test your skills in electronics domain. Listed below are the questions to test how you fare - so sit up, read the questions and start answering to test your knowledge!

Q1. What will happen to the resistance if the temperature of a carbon resistor is increased?
A.            It will increase by 20% for every 10 degrees centigrade
B.             It will stay the same
C.             It will change depending on the resistor's temperature coefficient rating
D.            It will become time dependent

Q2. What type of capacitor is often used in power-supply circuits to filter the rectified AC?
A.            Disc ceramic
B.             Vacuum variable
C.             Mica
D.            Electrolytic

Q3. Which of the following is the primary advantage of ceramic capacitors?
A.            Tight tolerance
B.             High stability
C.             High capacitance for given volume
D.            Comparatively low cost

Q4. Which of the following is an advantage of an electrolytic capacitor?
A.            Tight tolerance
B.             Non-polarized
C.             High capacitance for given volume
D.            Inexpensive RF capacitor

Q5. Which of the following is one effect of lead inductance in a capacitor used at VHF and above?
A.             Effective capacitance may be reduced
B.             Voltage rating may be reduced
C.             ESR may be reduced
D.            The polarity of the capacitor might become reversed

Q6. What is the main disadvantage of using a conventional wire-wound resistor in a resonant circuit?
A.            The resistor's tolerance value would not be adequate for such a circuit
B.             The resistor's inductance could detune the circuit
C.             The resistor could overheat
D.            The resistor's internal capacitance would detune the circuit

Q7. What is an advantage of using a ferrite core with a toroidal inductor?
A.            Large values of inductance may be obtained
B.             The magnetic properties of the core may be optimized for a specific range of frequencies
C.             Most of the magnetic field is contained in the core
D.            All of these choices are correct

Q8. How should two solenoid inductors be placed so as to minimize their mutual inductance?
A.            In line with their winding axis
B.             With their winding axes parallel to each other
C.             With their winding axes at right angles to each another
D.            Within the same shielded enclosure

Q9. Why might it be important to minimize the mutual inductance between two inductors?
A.            To increase the energy transfer between both circuits
B.             To reduce or eliminate unwanted coupling
C.             To reduce conducted emissions
D.            To increase the self-resonant frequency of both inductors

Q10. What is an effect of inter-turn capacitance in an inductor?
A.            The magnetic field may become inverted
B.             The inductor may become self resonant at some frequencies
C.             The permeability will increase
D.            The voltage rating may be exceeded

Q11. What is the common name for a capacitor connected across a transformer secondary that is used to absorb transient voltage spikes?
A.            Clipper capacitor
B.             Trimmer capacitor
C.             Feedback capacitor
D.            Suppressor capacitor

Q12. What is the common name for an inductor used to help smooth the DC output from the rectifier in a conventional power supply?
A.            Back EMF choke
B.             Repulsion coil
C.             Charging inductor
D.            Filter choke

Q13. What type of component is a thermistor?
A.            A resistor that is resistant to changes in value with temperature variations
B.             A device having a controlled change in resistance with temperature variations
C.             A special type of transistor for use at very cold temperatures
D.            A capacitor that changes value with temperature

Q14.What is the peak-inverse-voltage rating of a rectifier?
A.            The maximum voltage the rectifier will handle in the conducting direction
B.             1.4 times the AC frequency
C.             The maximum voltage the rectifier will handle in the non-conducting direction
D.            2.8 times the AC frequency

Q15. What are the two major ratings that must not be exceeded for silicon-diode rectifiers?
A.             Peak inverse voltage; average forward current
B.             Average power; average voltage
C.             Capacitive reactance; avalanche voltage
D.            Peak load impedance; peak voltage

Q16. What is the approximate junction threshold voltage of a germanium diode?
A.            0.1 volt
B.             0.3 volts
C.             0.7 volts
D.            1.0 volts

Q17. When two or more diodes are connected in parallel to increase current handling capacity, what is the purpose of the resistor connected in series with each diode?
A.            The resistors ensure the thermal stability of the power supply
B.             The resistors regulate the power supply output voltage
C.             The resistors ensure that one diode doesn't carry most of the current
D.            The resistors act as swamping resistors in the circuit

Q18. What is the approximate junction threshold voltage of a silicon diode?
A.            0.1 volt
B.             0.3 volts
C.             0.7 volts
D.            1.0 volts

Q19. Which of the following is an advantage of using a Schottky diode in an RF switching circuit as compared to a standard silicon diode?
A.             Lower capacitance
B.             Lower inductance
C.             Longer switching times
D.            Higher breakdown voltage

Q20. What are the stable operating points for a bipolar transistor that is used as a switch in a logic circuit?
A.             Its saturation and cut-off regions
B.             Its active region (between the cut-off and saturation regions)
C.             Between its peak and valley current points
D.            Between its enhancement and deletion modes

Q21. Why is it often necessary to insulate the case of a large power transistor?
A.            To increase the beta of the transistor
B.             To improve the power dissipation capability
C.             To reduce stray capacitance
D.            To avoid shorting the collector or drain voltage to ground

Q22. Which of the following describes the construction of a MOSFET?
A.            The gate is formed by a back-biased junction
B.             The gate is separated from the channel with a thin insulating layer
C.             The source is separated from the drain by a thin insulating later
D.            The source is formed by depositing metal on silicon

Q23. Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?
A.             Control grid
B.             Heater
C.             Screen Grid
D.            Suppressor grid

Q24. Which of the following solid state devices is most like a vacuum tube in its general characteristics?
A.            A bipolar transistor
B.             An FET
C.             A tunnel diode
D.            A varistor

Q25. What is the primary purpose of a screen grid in a vacuum tube?
A.             To reduce grid-to-plate capacitance
B.             To increase efficiency
C.             To increase the high frequency response
D.            To decrease plate resistance

Q26. What is an advantage of the low internal resistance of Nickel Cadmium batteries?
A.            Long life
B.             High discharge current
C.             High voltage
D.            Rapid recharge

Q27. What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery?
A.            6 volts
B.             8.5 volts
C.             10.5 volts
D.            12 volts

Q28. When is it acceptable to recharge a carbon-zinc primary cell?
A.            As long as the voltage has not been allowed to drop below 1.0 volt
B.             When the cell is kept warm during the recharging period
C.             When a constant current charger is used
D.            Never

Q29. Which of the following is a rechargeable battery?
A.            Carbon-zinc
B.             Silver oxide
C.             Nickel Metal Hydride
D.            Mercury

This quiz  has been compiled by VU3PLP - An Active HAM (Amateur Radio Operator) from Bhuvaneshwar Orissa. Rajesh also operates website for Orissa HAMS which provides details of amateur radio activity in Orissa.

To read the answers and to check out more quiz on electronics, HAM Radio and other topics in Ham Radio Exam Practice section.

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