This is the Section 5 Module 5 of the compiled Electronics Coaching Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and other Electronics References. This particular Coaching Notes in Electronics Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.
Electronics Engineering Coaching: Section 5 Module 5
ยท Cut-in voltage or turn on voltage current
Ans: Exponentially increases
ยท Electron beam deflected from axial to enlarge
Ans: Deflection defocusing
ยท Equal ratio bridge
Ans: Heaviside Campbell bridge
ยท Silicon oxide (SiO2) is for
Ans: Insulation
ยท APD is better than PIN diode is for
Ans: Speed of operation
ยท Voltage for temperature stability of zener diode
Ans: 5.6 V
ยท 3 superconducting inductor in parallel
Ans: Persistor
ยท Application of semiconductor
Ans: Wafer
ยท LC circuit is used for
Ans: Load current
ยท Power factor of RC is between
Ans: 0 and 1
ยท Minimum Duty Cycle of Bust converter
Ans: Dmin = 1 โ (2fsLc)/RL
ยท Boost converter critical inductance
Ans: Lc = (1-D)2DRL)/2fs
ยท Buck Boost converter critical inductance
Ans: Lc = (1-D)2RL)/2fs
ยท Buck converter critical inductance
Ans: Lc = (1-D)RL)/2fs
ยท Typical CMRR
Ans: 100 to 10,000
ยท Typical CMRR in dB
Ans: 40 to 80 dB
ยท Accuracy of Wien bridge
Ans: 0.5% – 1%
ยท Typical value of armature resistance
Ans: 0.5ฮฉ
ยท The saturation voltage of an op-amp is ___ smaller than the power supply
Ans: 2 V
ยท Solid grounding has a voltage below
Ans: 660 V
ยท Resistance grounding has typical voltage between
Ans: 3.3 โ 11 kV
ยท Percentage conductivity of pure annealed silver wire
Ans: 108.8%
ยท Percentage conductivity of 99.5% pure gold
Ans: 72.6%
ยท Percentage conductivity of 63% pure aluminum
Ans: 63%
ยท Corona is maximum on
Ans: transmission lines
ยท Transformer that operates on the frequency range of 20 kHz to 20 MHz
Ans: Carrier frequency transformer
ยท JFET configuration for buffer amplifier
Ans: common drain
ยท JFET configuration for good voltage amplification
Ans: common source
ยท JFET configuration for high frequency amplifier
Ans: common gate
ยท The dc-dc converterwith unregulated input voltage and regulated output voltage
Ans: SMPS (Single Mode Power Supply)
ยท Corona is due to
Ans: radio interference
ยท A transformer on the frequency of 15 kHz
Ans: Converter transformer
ยท Ingredients of wet cell
Ans: Zinc and copper
ยท Main ingredient of dry cell
Ans: Zinc container
ยท It reduces gain to a limiting level
Ans: Limiter
ยท First transistor
Ans: Point contact
ยท First fuel battery was invented by _____ in 1959.
Ans: F.T. Bacon
ยท Unlike buck and boost converter, the buck boost converter featured output voltage:
Ans: opposite polarity to input.
ยท Lattice in which the lattice points are only shown in the crystal
Ans: Bravais Lattice
ยท An error due to shortcoming of instruments
Ans: Systematic error
ยท An error that cannot be corrected
Ans: Random error
ยท It is a substance where the bulk is composed
Ans: Element
ยท Typical voltage of lead-acid
Ans: 2.1 V
ยท What type of cell used in the emergency system?
Ans: Silver-zinc cell
ยท Microcontroller consists of
Ans: Microprocessor, memory, input and output unit
ยท Percentage of the transistor current flows in the collector
Ans: 95%
ยท SMPC operates between ON state and OFF state at a frequency of
Ans: 10 kHz and 40 kHz
ยท A camera with imaging positron effect with multiple layer of silicon detector
Ans: Compton camera
ยท NMOS is _____ than PMOS
Ans: 6 times
ยท What is the diameter of the wafer used in manufacturing?
Ans: 3 to 8 inches
ยท Standard spacing for IC chip
Ans: 2 um and 3 um
ยท Advanced spacing for IC chip
Ans: 1 um
ยท BCC crystal structure
Ans: Chromium
ยท HPC crystal structure
Ans: Zinc
ยท Another name for differential amplifier
Ans: Subtractor
ยท A factor that determines the filter response
Ans: Damping factor
ยท Unity gain amplifier has ____ input impedance
Ans: Extremely high
ยท Megger is
Ans: used to measure high resistance
ยท Increasing transmitter height
Ans: Decrease capacitance and inductance remains the same.
ยท Undergrounding conductor is
Ans: Maximum at the conductor and minimum at the sheath
ยท A transformer that has a frequency range from 100 Hz โ 150 kHz
Ans: Converter transformer
ยท Surge impedance of cable
Ans: 50 ฮฉ
ยท Ideal input impedance of op-amp
Ans: 50 ฮฉ
ยท Formula for the increase % in saturation current
Ans: 2((T2-T1)/10) X 100%
ยท Ideal noise factor
Ans: 0 dB
ยท Vacant lattice site with missing atom relocated to a interstitial space with no atom.
Ans: Frenkel effect
ยท FCC packing factor
Ans: 0.74
ยท Linear change of input
Ans: Ramp input
ยท Instantaneous, finite input
Ans: Step input
ยท Indicating device orientation of object
Ans: Selsyn
ยท An AC bridge that measures mutual inductance
Ans: Heaviside bridge
ยท One of the most important bridge in determining link capacitances
Ans: Schering bridge
ยท Highest dielectric strength
Ans: Glass
ยท High sensitivity
Ans: Permanent magnet
ยท A transformer in laminated core reduced
Ans: Eddy current
ยท An analysis used for more than one voltage source
Ans: Superposition theorem
ยท Maximum magnitude of the output voltage from an op-amp is called
Ans: Saturation voltage
ยท A graph of amplitude versus input frequency
Ans: Bode plot
ยท Effect of recombination on depletion region
Ans: Emission coefficient or ideality factor
ยท Magnetic amplifier operates at a frequency at ____ or less
Ans: 100 Hz
ยท Most commonly used coupling
Ans: Transformer coupling
ยท Typical LED voltage
Ans: 1.6 V
ยท Capacitance of disc ceramic capacitor
Ans: 100 pF
ยท A bypass capacitor at high frequency
Ans: Ceramic capacitor
ยท Indicating device orientation of object
Ans: Selsyn
ยท Odd parity checker
Ans: XOR
ยท Shelf life of lithium cell
Ans: 5 to 10 years
ยท Negative feedback
Ans: Increases bandwidth and decrease voltage gain
ยท Alkaline cell ingredient
Ans: Potassium hydroxide
ยท Advantage of NiCd over lead acid
Ans: Cell on NiCd can be replaced
ยท By adding parallel circuit to the inverting amplifier
Ans: Inverting summing
ยท Linear amplification
Ans: Level clamper
ยท Theory of magnetic flux in a closed system equal to zero
Ans: Gauss theorem
ยท Personal error
Ans: Gross error
ยท Advantage of magnetic disk to magnetic tape
Ans: Easier to read
ยท The maximum current can safely handle
Ans: Ampacity
ยท JFET reference voltage
Ans: Source
ยท Buffer amplifier gain
Ans: 1
ยท AWG no. 6
Ans: 0.395 ฮฉ/1000 ft.
ยท AWG no. 12
Ans: 6350 cmil
ยท Indicating device orientation of object
Ans: Selsyn
ยท A mass of 1.66 x 10-27 kg.
Ans: Unified amu
ยท Reciprocal of Avogadroโs number
Ans: amu
ยท Electrostatic radius of an atom
Ans: 10-14
ยท Manipulator has ___ degrees of freedom
Ans: 3
ยท Arrange in data arrays
Ans: RAM
ยท OS memory
Ans: BIOS
ยท Voltage amplifier
Ans: Pre-amplifier
ยท Latest used data
Ans: Cache memory
ยท LIFO
Ans: Stack memory
ยท Minimum distance of features in a chip
Ans: Geometry
ยท Number of elements not found in nature but also prepared in laboratories
Ans: 105
ยท IC advantage
Ans: Reliability
ยท Minimum to maximum range
Ans: Span
ยท 1/5 of the Wi-Fi range
Ans: Bluetooth
ยท Temperature of Class B motor
Ans: 130ยฐC
ยท Temperature of Class F motor
Ans: 155ยฐC
ยท Pure ac voltage single frequency
Ans: Single pip
ยท Cannot be used as a permanent magnet
Ans: Caryon
ยท In doubleโs Kelvin bridge, 1ฮฉ to 10 uฮฉ
Ans: 0.05% – 0.2%
ยท Wien bridge oscillator
Ans: f = 1/(2ฯRC)
ยท Most important IEEE standard interface
Ans: IEEE 488 digital interface
ยท Common method of coupling used in cascade amplifier stages
Ans: Transformer
ยท It is most obvious at higher frequencies
Ans: Corona
ยท Early IC packaging method used in transistors
Ans: TO (Transistor Outline)
ยท PLCC
Ans: Plastic Lead chip memory
ยท It is used in Hi-Fi audio system to split frequencies to fed tweeter and woofer
Ans: Crossover network
ยท Resistance offered by a PN junction in AC conditions
Ans: Dynamic resistance
ยท Characteristic of shared systems to avoid mixing up of print outs or programs
Ans: Spooling
ยท Absorption of slow moving electrons by an interleaving matter
Ans: Ramsauer effect
ยท If a load is removed from a long transmission line, the sending voltage end is less than receiving end
Ans: Ferranti effect
ยท Corona results in
Ans: Radio interference
ยท Ratio of thermal conductivity to electrical conductivity is directly proportional to the absolute temperature of all metals
Ans: Weidemann Franz Law
ยท Color of neutral in 3-core flexible cable
Ans: Blue
ยท It is neglected in short transmission line analysis
Ans: Shunt admittance
ยท It is located near transformer
Ans: Lightning arrester
ยท Volume of atom ratio to cell volume
Ans: Packing factor
ยท RLC circuit that provides undamped oscillation
Ans: Ringing circuit
ยท Contact between metal and heavily doped-semiconductor
Ans: Ohmic contact
ยท Comparator with hysteresis
Ans: Schmitt trigger
ยท Negative electron
Ans: Negatron
ยท Input continuously increases constant output
Ans: Level Clamp
ยท Four arm AC bridge measures inductance by standard capacitance
Ans: Maxwell Bridge
ยท Shows positions of lattice points
Ans: Bravais Lattice
ยท Measures the diameter of an atom
Ans: Ernest Rutherford
ยท Ratio of the AC power supply to the plate power supply
Ans: Plate efficiency
ยท Electromechanical device that converts electrical to mechanical by attraction of iron plunger to the electromagnet
Ans: Solenoid
ยท Lithium battery
Ans: Microcomputer memory back-up
ยท Protection against electric shock
Ans: Earthing
ยท The heat generated melts the portion at the tip of the electrode and the base of the metal
Ans: Shielded Metal Arc Welding (SMAW)
ยท Advantages of PCB
Ans: Eliminates bigger chassis and point to point mounting
ยท Energy to raise the electron to another orbit
Ans: Excitation
ยท It is used in high voltage and high current application for most efficient regulator
Ans: Switching regulator
ยท What refers to garaging the two adjustments of an Ac bridge together in such a way that changing one adjustment changes the other in a special way, but changing the second adjustment does not change first?
Ans: Orthogonal nulling
ยท Not common sine wave generator
Ans: Multivibrator
ยท Range of degrees of freedom
Ans: Work envelope
ยท Physical bend, twist, and reach
Ans: Manipulator
ยท Poor selectivity
Ans: Wide bandwidth
ยท It has amplifier and feedback
Ans: Electronic amplifier
ยท Maintenance of oscillation
Ans: Flywheel effect
ยท Free electrons collidal to bound electrons causing mere current carriers
Ans: Avalanche effect
ยท Magnetic leakage due to 100% coupling
Ans: Electromagnetic effect
ยท A particle resulting to an atom of an element combined to form a compound
Ans: Molecule
ยท P shell number of electrons
Ans: 72
ยท Solid formed by covalent bonding
Ans: Crystal
ยท The resistance in the magnetic path to the magnetic lines of force
Ans: Reluctance
ยท The flux density in an iron core when the magnetic intensity is zero
Ans: Residual magnetism
ยท When an electron rises to the conduction band a hole is created in the valence band, this called _____
Ans: Electron hole pair
ยท Operating temperature of silicon.
Ans: -175 to 350ยฐC
ยท Highly sensitive material
Ans: Permanent magnet
ยท Smallest ripple voltage
Ans: Multi-section LC filter
ยท Highest torque
Ans: Series motors
ยท Motivating input in a control system which is independent with the output
Ans: Command input
ยท Development process of a microcrystal molten
Ans: Crystal growth
ยท The voltage regulator, the component used as a comparator
Ans: Op-amp
ยท It is not an resistance welding
Ans: Arc welding
ยท Atom to atom bond on surface with oxide free surface
Ans: Pressure welding
ยท Elimination of stray capacitance
Ans: Shielding and grounding
ยท 2 identical shunt motor
Ans: Hopkinson
ยท In doubleโs Kelvin bridge, 1ฮฉ to 10 uฮฉ
Ans: 0.05% – 0.2%
ยท AC voltage frequency converter from one form to another
Ans: Cyclo converter
ยท Skin effect seen at
Ans: High frequencies
ยท Indicates the address of next instruction
Ans: Program counter
ยท Drift current is directly proportional to mobility, diffusion is directly proportional to concentration of diffusion
Ans: Einstein relation
ยท dV/dt in SCR
Ans: False trigerring
ยท It divides an HF signal so that a low frequency counter would be able to display the operating frequency
Ans: Prescaler circuit
ยท Responds to the variation in incident photon
Ans: Quantum detector
ยท Draws less current from circuit under test
Ans: FETVM
ยท It provides very high electrical isolation between control ckt and power ckt, has high impedance between light source and phototransistor.
Ans: Optoisolator
ยท It is used to measure variations by the changing metallic resistance
Ans: Bolometer
ยท Most common bolometric device
Ans: Thermistor
ยท These are mostly used in robot than AC because it can with stand large overload.
Ans: DC motor and stepper motor
ยท Converting sine wave to series of pulses
Ans: Timing Marker Generator
ยท Current regulator alone
Ans: Regulator IC alone
ยท What do you call a short circuit having minimum resistance?
Ans: Dead short
ยท What is used in measuring wires from number 0 to number 36?
Ans: AWG
Complete List of Electronics Engineering Coaching Materials
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