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Learn Electronics

Electronics Applications

Instructions

  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best.


1.     Power that is measured in volt-amperes is called?
Impedance power
Reactive power
True power
Apparent power
2.     As frequency increases?
Both series and parallel RC impedance decrease
Series RC impedance decreases and parallel RC impedance increases
Series RC impedance increases and parallel RC impedance decreases
Both series and parallel RC impedance increase
3.     The transformer turns ratio determines?
The ratio of primary and secondary voltages
The ratio of primary and secondary currents
The reflected impedance
All of the above
4.     Mutual induction is dependent on?
Winding ratios
Output polarities
Dc voltage levels
Current changes
5.     What electrical characteristic of intrinsic semiconductor material is controlled by the addition of impurities?
Conductivity
Resistance
Power
All of the above
6.     Which material may also be considered a semiconductor element?
Carbon
Ceramic
Mica
Argon
7.     When a parallel circuit resonates it is said to?
Flywheel
Oscillate
Both of the above
None of the above
8.     In a parallel RLC circuit, which value may always be used as a vector reference?
Current
Reactance
Resistance
Voltage
9.     The voltage where current may start to flow in a reverse-biased pn junction is called the?
Breakdown voltage
Barrier potential
Forward voltage
Biasing voltage
10.     Testing a good diode with an ohmmeter should indicate?
High resistance when forward or reverse biased
Low resistance when forward or reverse biased
High resistance when reverse biased and low resistance when forward biased
High resistance when forward biased and low resistance when reverse biased
11.    Lightning conductors are made up of _________.
Iron
Aluminium
Copper
Steel
12.     Power supplies are regulated to prevent the output voltage from changing due to changes in the?
Line voltage
Supply voltage
Frequency
Both line voltage and supply load
13.    Power supplies differ from batteries in that?
Power supply output voltages are ac and not dc
Power supply voltages are not stable
Power supplies are low-current devices
None of the above
14.    If the diameter of a wire is double, its current carrying capacity becomes?
One-fourth
Half
Twice
Four times
15.    Which capacitor store higher amount of energy?
Air capacitor
Paper capacitor
Mica capacitor
Plastic film capacitor
16.    Which resistive component is designed to be temperature sensitive?
Thermistor
Rheostat
Potentiometer
Photoconductive cell
17.    Ohmic conductor among the following is _____
Transistor
Thermal value
Electrolyte
Constantum
18.    A moving electric charge produces__________.
Only Electric field
Only Magnetic field
Both electric and magnetic field
Either electric or a magnetic field
19.    In which among the following is alternating current not used?
Refrigeration
Heat production
Electroplating
Radio detection
20.    Galvanometer can be converted into a voltmeter by using?
Low resistance in series
High resistance in series
Low resistance in parallel
High resistance in parallel