Electronic Circuits I Set 9

Electrical Engineering

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This set of Electronic Circuits 1 Multiple Choice Questions & Answers (MCQs) focuses on Electronic Circuits I Set 9

Q1 | The output characteristics of a MOSFET, is a plot of
  • id as a function of vgs with vds as a parameter
  • id as a function of vds with vgs as a parameter
  • ig as a function of vgs with vds as a parameter
  • ig as a function of vds with vgs as a parameter
Answer: id as a function of vds with vgs as a parameter
Explaination:
it is id vs vds which are plotted for different values of vgs (gate to source voltage).
Q2 | SMPS is used for
  • obtaining controlled ac power supply
  • obtaining controlled dc power supply
  • storage of dc power
  • switch from one source to another
Answer: obtaining controlled dc power supply
Explaination:
smps (switching mode power supply) is used for obtaining controlled dc power supply.
Q3 | Choose the incorrect statement.
  • smps is less sensitive to input voltage variations
  • smps is smaller as compared to rectifiers
  • smps has low input ripple
  • smps is a source of radio interference
Answer: smps has low input ripple
Explaination:
smps has higher output ripple and its regulation is worse.
Q4 |                    is used for critical loads where temporary power failure can cause a great deal of inconvenience.
  • smps
  • ups
  • mps
  • rccb
Answer: ups
Explaination:
uninterruptible power supply is used where loads where temporary power failure can cause a great deal of inconvenience.
Q5 |                      is used in the rotating type UPS system to supply the mains.
  • dc motor
  • self excited dc generator
  • alternator
  • battery bank
Answer: alternator
Explaination:
when the supply is gone, the diesel engine is started, which runs the alternator and the alternator supplies power to the mains. non-rotating type ups are not used anymore.
Q6 | Static UPS requires                      
  • only rectifier
  • only inverter
  • both inverter and rectifier
  • none of the mentioned
Answer: both inverter and rectifier
Explaination:
rectifier to converter the dc from the battery to ac. inverter to charge the battery from mains.
Q7 | Usually                      batteries are used in the UPS systems.
  • nc
  • li-on
  • lead acid
  • all of the mentioned
Answer: lead acid
Explaination:
lead acid batteries are cheaper and have certain advantages over the other types. nc batteries would however be the best, but are three to four times more expensive than lead acid.
Q8 | HVDC transmission has                        as compared to HVAC transmission.
  • smaller transformer size
  • smaller conductor size
  • higher corona loss
  • smaller power transfer capabilities
Answer: smaller conductor size
Explaination:
the conductor size is smaller as there is no sink effect, and the whole conductor is utilized for transmitting power.
Q9 | The negative polarity is used in the monopolar link because it
  • uses less conductor size
  • is safer
  • produces less radio interference
  • has less resistance
Answer: produces less radio interference
Explaination:
the monopolar link uses just a single conductor, which is usually negative as it produces less radio interference and corona.
Q10 | Which of the following can be a source of supply in dc power supplies?
  • battery
  • dry cell
  • full wave rectifier
  • all of the mentioned
Answer: all of the mentioned
Explaination:
source of supply will be a battery, dry cell or full wave rectifier etc.
Q11 | Which of the application’s filters used for?
  • reducing ripples
  • increasing ripples
  • increasing phase change
  • increasing amplitude
Answer: reducing ripples
Explaination:
ripples are ac components and filters are used for eliminating ac components from a signal.
Q12 | Which of the following represent a change of output voltage when load current is increased?
  • line regulation
  • load regulation
  • current regulation
  • voltage regulation
Answer: load regulation
Explaination:
load regulation is the process of fractional change of output voltage when load current is increased from zero to maximum value.
Q13 | Which of the following generate output voltage much closer to true value?
  • true generator
  • precision generator
  • output generator
  • accurate generator
Answer: precision generator
Explaination:
precision generators are one which generates output voltage much closer to the true value.
Q14 | Why zener diodes are provided in dc supply?
  • for forward conduction
  • for reverse conduction
  • for reference voltage
  • for increasing amplitude
Answer: for reference voltage
Explaination:
zener diodes in dc power supplies are used for providing a reference voltage used for comparison.
Q15 | Stability of output voltage is entirely depended on                              
  • stability of transformer
  • stability of zener diode
  • quality of wires
  • capacitor values
Answer: stability of zener diode
Explaination:
stability of zener diodes used is an important factor in determining the stability of output voltage in dc power supply.
Q16 | For excellent stability, the zener diode is kept in temperature controlled casket.
  • true
  • false
Answer: true
Explaination:
zener diode is kept on temperature controlled casket due to its low temperature coefficient which may lead to less stability.
Q17 | For instrumentation system, precision variable voltage-reference system is necessary.
  • true
  • false
Answer: true
Explaination:
precision variable voltage reference system is used for comparing voltage with a reference voltage and can be used in the instrumentation system.
Q18 | Which of the following can be used as a comparator?
  • zener diode
  • diode
  • operational amplifier
  • all of the mentioned
Answer: operational amplifier
Explaination:
operational amplifier can be used as a comparator circuit.
Q19 | Which of the following are not the standard value of Zener diodes?
  • 5.1 v
  • 5.6 v
  • 5.8v
  • 6.2v
Answer: 5.8v
Explaination:
standard values of zener voltages are 5.1v, 5.6v, 6.2v and 9.1v etc.
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