ELECS Coaching 1
Master the Basics of Electronics
Welcome to the ELECS Coaching 1 Quiz, designed for enthusiasts and professionals in the field of electronics. This comprehensive quiz consists of 101 challenging questions that cover a wide range of topics, from semiconductor physics to PLC programming.
Test your knowledge and understanding with questions including:
- Semiconductor principles
- Electrical fields and conduction
- PLC programming techniques
- Electricity and magnetism fundamentals
The bandgap of silicon at room temperature is:
A. 1.3 eV
B. 1.1 eV
C. 0.7 eV
D. 1.4 eV
Both the conduction and displacement current densities coexist in
A. Only conductors in air
B. Only dielectrics in air
C. Conductors placed in any dielectric medium
D. Never coexist
While performing read operation, one must take care that much current should not be
A. Sourced from data lines
B. Sinked from data lines
C. Sourced or sinked from data lines
D. Sinked from address lines
The static error band of a recording instrument signifies:
A. The accuracy of the instrument
B. The error produced when the pen is stopped at some deflection
C. The error introduced in low varying inputs
D. The irrepeatibility of the instrument
In a p + n junction diode under reverse biased the magnitude of electric field is maximum at:
A. The edge of the depletion region on the p - side
B. The edge of the depletion region on the n - side
C. The p + n junction
D. The center of the depletion region on the n - side
Consider the two-transistor analogy of SCR, if α1 and if α2 are the common-base current gains of both the transistor then turn-on the device:
A. α1 + α2 should approach zero
B. α1 x α2 should approach unity
C. α1 - α2 should approach zero
D. α1 + α2 should approach unity
Di/dt protection is provided to the thyristor by:
A. Connecting an inductor in parallel across the load
B. Connecting an inductor in series across the load
C. Connecting an inductor in parallel across the gate terminal
D. Connecting an inductor in series across the gate
The concentration of minority carries in an extrinsic semiconductor under equilibrium is:
A. Directly proportional to doping concentration
B. Inversely proportional to doping concentration
C. Directly proportional to intrinsic concentration
D. Inversely proportional to intrinsic concentration
In memory-mapped scheme, the device are viewed as
A. distinct I/O devices
B. Memory locations
C. Only input devices
D. Only output devices
What is the location of the internal registers of CPU?
A. Internal
B. On-chip
C. External
D. Motherboard
The line integral of the electric field intensity is
A. Mmf
B. Emf
C. Electric potential
D. Magnetic potential
Higher the magnitude of the gate pulse:
A. Lesser is the time required to inject the charges
B. Greater is the time required to inject the charges
C. Greater is the value of anode current
D. Lesser is the value of anode current
If the current sensitivity of a galvanometer is increased, the voltage sensitivity:
A. Decrease
B. Increase
C. Remains unaltered
D. May increase or decrease
In good conductors, the electric and magnetic fields will be:
A. 45 in phase
B. 45 out of phase
C. 90 in phase
D. 90 out of phase
P-I-N photoreceiver based on HEMT is integrated with ____ guiding layers.
A. GaAs and InP
B. GaAs
C. InGa
D. InGaAsP
A current of 10A is flowing through a circuit. The power factor is 0.5 lagging. The instantaneous value of the current can be written as:
A. I = 10 sin 60❰ A
B. I = 10 sin(ωt - 30❰) A
C. I = 14.14 sin (ωt - 60❰) A
D. I = 14.14 sin (ωt + 60❰) A
Clipper circuit is also known as:
A. limiter
B. slicer
C. Amplitude selector
D. All are correct
State box without decision and conditional box is:
A. Algorithmic State Machine (ASM)
B. Defined block
C. Simple block
D. Both A and B
The time varying electric field is
A. E = -∇V D. E = -∇V - D
B. E = -∇V – A
C. E = -∇V - B
D. E = -∇V - D
The N(S) becomes ____ when s is equal to any of the poles
A. ∞
B. 0
C. 1
D. 2
The difference between online and offline PLC programming is…
A. Whether the PLC is running or stopped
B. Whether the programming PC has internet connectivity
C. The type of programming cable used
D. Where the edited program reside
The Programmable Unijunction Transistor (PUT) turns on & starts conducting when the:
A. Gate voltage exceeds anode voltage by a certain value
B. Anode voltage exceeds gate voltage by a certain value
C. Gate voltage equals the anode voltage
D. Gate is given negative pulse w.r.t. To cathode
In PLC programming, a retentive function is one that:
A. Defaults to the “on” state
B. Comes last in the program
C. Defaults to the “off” state
D. Is not reset after a power cycle
The current in a metal at any frequency is due to
A. Conduction current
B. Displacement current
C. Both conduction and displacement current
D. Neither conduction nor displacement
What directive specifies the end of execution of a program?
A. End
B. Return
C. Stop
D. Terminate
Optical interconnection between optoelectronic device is achieved in:
A. Wavelength amplifier
B. Wavelength convertor
C. Replication technology
D. Chip-to-chip interconnection
A good application for a timed interrupt in a PLC program would be:
A. A communications fun
B. A PID function block
C. A math function block
D. A motor start/stop rung
In AVR, which of the following registers are there for the I/O programming of ports?
A. PIN
B. DDR
C. PORT
D. All of the mentioned
Find the conductivity current density when conductivity of a material is 500 units and corresponding electric field is 2 units.
A. 500
B. 250
C. 1000
D. 2000
Instructions which won’t appear in the object program are called as ____.
A. Redundant instructions
B. Exceptions
C. Comments
D. Assembler Directives
Which of the following steps have to be followed for interfacing a sensor to a microcontroller 8051?
A. Interfaces sensor with ADC and ADC with 8051
B. Interface sensor with the MAX232, send now to microcontroller, analyze the results
C. Make the appropriate connections with the controller, ADC conversion, analyze the results
D. None of the above
The directive used to perform initialization before the execution of the code is ____.
A. Reserved
B. Store
C. Dataword
D. EQU
Historically, central systems were used because:
A. Semiconductors memory was not available
B. Memory was very expensive
C. Memory consumed a large amount of power
D. All of the choices
What directive is used to specify and assign the memory required for the block of code?
A. Allocate
B. Assign
C. Set
D. Reserve
The type of communication in which the pulse to turn off the SCR is obtained by separate voltage source is:
A. class B commutation
B. class C commutation
C. class D commutation
D. class E commutation
When dealing with the branching code the assembler ____.
A. Replaces the target with its address
B. Does not replace until the test condition
C. Finds the Branch offset and replaces the Branch target with it
D. Replaces the target with the value specified by the DATAWORD directive
The assembler stores all the names and their corresponding values in:
A. Special purpose Register
B. Symbol Table
C. Value Map
D. None of the above
The assembler stores the object code in:
A. Main memory
B. Cache
C. RAM
D. Magnetic disk
The utility program used to bring the object code into memory for execution is ____.
A. loader
B. fetcher
C. extractor
D. linker
Time proportional control:
A. Can be used on a PM550 programmable process controller
B. Is less efficient than normal PID control
C. Cannot use a TM990 microcomputer
D. Both A and B above
In a single pulse semi-converter using two SCRs, the triggering circuit must produce:
A. Two firing pulses in each half cycle
B. One firing pulse in each half cycle
C. Three firing pulses in each cycle
D. One firing pulse in each cycle
The device-status table contains:
A. each I/O device type
B. each I/O device address
C. each I/O device state
D. All of the mentioned
In a 3-phase full converter using six SCRs, gating circuit must provide
A. One firing pulse every 30❰
B. One firing pulse every 90❰
C. One firing pulse every 60
D. Three firing pulse per cycle
For a type 2 system, the steady-state:
A. Error for a step input is always zero
B. Error for a velocity input is always zero
C. Input for acceleration input is always non-zero
D. All of the choices
In the complete firing circuit, the driver circuit consists of:
A. Pulse generator and power supply
B. Gate leads and power supply
C. Pulse amplifier and pulse transformer
D. Pulse detector and pulse amplifier
In the complete firing circuit, the driver circuit consists of:
A. Pulse generator and power supply
B. Gate leads and power supply
C. Pulse amplifier and pulse transformer
D. Pulse detector and pulse amplifier
The program execution time:
A. Must be slower than the fastest mechanical operation that is to be controlled
B. Will vary depending on the language used
C. Cannot be changed once the program is written
D. All of the choices
I/O hardware contains:
A. Bus
B. Controller
C. I/O port and its registers
D. All of the mentioned
Find the average gate power dissipation (Pgav) when the maximum allowable gate power dissipation (Pgm) = 10kW, with a duty cycle = 50 %
A. 10 kW
B.5 kW
C. 2.5 kW
D. 7 kW
Any electronic holding place where data can be stored and retrieved later whenever required is ____.
A. memory
B. drive
C. disk
D. circuit
Find the triggering frequency when the average gate dissipation = 0.3 W and the peak gate drive power is 5 Watts. The gate source has a pulse width of 20 𝜇sec duration.
A. 3 kHz
B. 0.3 kHz
C. 30 kHz
D. 0.03 kHz
The duty cycle can be written as:
A. fxT
B. f/T
C. T/f
D. f
It is to be noted that T = pulse width whereas f = (1/T1) = frequency of firing or pulse repetition rate. The chip 74LS245 is:
A. Bidirectional buffer
B. 8-bit input port
C. One that has 8 buffers
D. All of the mentioned
The assembler directive EQU, when used in the instruction: Sum EQU 200 does:
A. Finds the first occurrence of Sum and assigns value 200 to it
B. Replaces every occurrence of Sm with 200
C. Re-assigns the address of Sum by adding 200 to its original address
D. Assigns 200 bytes of memory starting the location of Sum.
Find the range of band gap energy for conductors.
A. >6 eV
B. 0.2-0.4 eV
C. 0.4-2 eV
D. 2-6 eV
The magnitude of gate voltage and gate current for triggering an SCR is:
A. Inversely proportional to the temperature
B. Directly proportional to the temperature
C. Inversely proportional to the anode current requirement
D. Directly proportional to the anode current requirement
The coefficients of the polynomials P (S) and Q (S) in the network function N (S) are ____ for passive network.
A. Real and positive
B. Real and negative
C. Complex and positive
D. Complex and negative
A universal logic gate is one which can be used to generate any logic function. Which of the following is a natural logic state?
A. OR
B. AND
C. XOR
D. NAND
Which of the following connects high-speed high-bandwidth device to memory subsystem and CPU?
A. Expansion bus
B. PCI bus
C. SCSI bus
D. None of the mentioned
If the loss tangent is very less, then the material will be a:
A. Conductor
B. Lossless dielectric
C. Lossy dielectric
D. Insulator
For conductors, the free electrons will exist at
A. Valance band
B. Middle of valence and conduction band
C. Will not exist
D. Conduction band
In case of a cosine firing scheme, ____ is used to get a cosine wave.
A. IC 555
B. A comparator
C. An integrator circuit
D. A differentiator circuit
Clamper clamps the ____ peak at the zero volt.
A. positive
B. negative
C. A and B are correct
D. All are correct
Which hardware triggers some operations after certain programmed count?
A. Programmable interval timer
B. Interrupt timer
C. Programmable timer
D. None of the mentioned
The natural reversal of ac supply voltage commutates the SCR in case of:
A. Forced commutation
B. Only line commutation
C. Only natural commutation
D. Both line and natural commutation
Calculate the convection current when electron density of 200 units is travelling at a speed of 12 m/s.
0%
0
A. 16.67
0%
0
B. 2400
0%
0
C. 2880
0%
0
D. 0.06
The data-in register of I/O port is:
A. Read by host to get input
B. Read by controller to get input
C. Written by host to send output
D. Written by host to start a command
Device drivers are implemented to interface:
A. Character devices
B. Block devices
C. Network devices
D. All if the mentioned
Conduction
A. Electrons only
B. Electrons and holes
C. Holes only
D. Applied electric field
A process is moved to wait queue when I/O request is made with ____.
A. non-blocking I/O
B. blocking I/O
C. asynchronous
D. synchronous
The output of a logic gate is 1 when all the inputs are at logic 0 as shown below: The gate is either:
A. A NAND or an EX-OR
B. An OR or an EX-NOR
C. An AND or an EX-OR
D. A NOR or an EX-NOR
The following switching functions are to be implemented using a decader: f1=Σm(1,2,4,8,10,14) f2=Σm(2,5,9,11) f3=Σm(2,4,5,6,7) The minimum configuration of decoder will be:
A. 2 to 4 lines
B. 3 to 8 lines
C. 4 to 16 lines
D. 5 to 32 lines
If the number of zeros (n) are greater than the number of poles (m), then there will be ____ number of zeros at s = ∞.
A. n
B. m
C. n-m
D. n+m
The latch or IC 74LS373 acts as:
A. Good input port
B. Bad input port
C. Good output port
D. Bad output port
A full adder logic circuit will have:
A. Two inputs and one output
B. Three inputs and three outputs
C. Two inputs and two outputs
D. Three inputs and two outputs
A positive clamper adds:
A. positive DC level
B. negative DC level
C. AC level
D. A and B are correct
Which of the following are known as universe gate?
A. NAND & NOR
B. AND & OR
C. XOR & OR
D. EX-NOR & XOR
FORTRAN is:
A. Machine dependent
B. A medium-level language
C. A mathematically oriented language
D. All of the choices
The alternate way of writing the instruction, ADD #5, R1 is ____.
A. ADD [5], [R1]
B. ADDI 5, R1;
C. ADDIME 5, [R1];
D. There is no other way
If the poles or zeros are not repeated, then the function is said to be having ____ poles or ____ zeros.
A. simple, multiple
B. multiple, simple
C. simple, simple
D. multiple, multiple
By equating the denominator of transfer function to zero, which among the following will be obtained?
A. Poles
B. Zeros
C. Both poles and zeros
D. None of the above
By equating the denominator of transfer function to zero, which among the following will be obtained?
A. Poles
B. Zeros
C. Both poles and zeros
D. None of the above
Ergonomics refers to:
A. The human aspect of environment around the workstation as well as the workstation itself
B. The cost relationship of the workstation versus productivity
C. The level of involvement the operator has with the workstation
D. The technology involved in the workstation itself
Which buffer holds
A. spool
B. Output
C. Status
D. Magic
R81 = 3 kΩ and R82 = 6 kΩ. Find the intrinsic stand-off ratio (η) of the UJT.
0%
0
A. 9
0%
0
B. 1/3
0%
0
0%
0
D. 3
When hardware is accessed by reading and writing to the specific memory locations, then it is called ______.
A. port-mapped I/O
B. controlled-mapped I/O
C. bus-mapped I/O
D. None of the mentioned
Which of the following is correct about BRNE instruction in AVR microcontroller?
A. It is used to jump to the given mentioned label when the zero flag accounts to 0
B. It is used to check the zero flag
C. It is used to compare two registers
D. It is used to compare two values
A common way to take x, y coordinates off a drawing is to use a
A. Light pen
B. Digitizer
C. Direct view storage tube (DVST)
D. Tablet
The TRIAC’s terminals are:
A. gate, anode, cathode
B. MT1, MT2, gate
C. gate1, gate2, anode, cathode
D. MT1, MT2, gate1, gate2
Which CAD display configurability allows work without any host support?
A. Highly intelligent
B. Medium intelligence
C. Low intelligence
D. One with no secondary storage capacity
Maxwell’s equations give the relations between
A. Different fields
B. Different sources
C. Different boundary conditions
D. None of the above
When the number of poles is equal to the number of zeroes, how many branches of root locus tends towards infinity?
A. 1
B. 2
C. 0
D. Equal to number of zeroes
If the RC firing circuit used for firing an SCR is to be used to fire a TRIAC then
A. The capacitor should be removed
B. The diode should be replaced by a diac
C. The diode should be replaced by bjt
D. The diode should be shorted using a resistor
The two-transistor model of the SCR can be obtained by:
A. Bisecting the SCR vertically
B. Bisecting the SCR horizontally
C. Bisecting the SCRs top two & bottom two layers
D. Bisecting the SCRs middle two layers
Find the band gap energy when a light of wavelength 1240 nm is incident on it.
0%
0
A. 1 eV
0%
0
B. 2 eV
0%
0
C. 3 eV
0%
0
D. 4 eV
Alternating current measured in a transmission line will be
A. Peak value
B. Average value
C. RMS value
D. Zero
What is the internal Vref of an Atmega32 series?
A. 3.3 V
B. 2.56 V
C. 5 V
D. All of the mentioned
The instructions like MOV or ADD are called as:
A. OP-Code
B. Operators
C. Commands
D. None of the mentioned
The code where all successive numbers differ from their preceding number by single bit is:
A. Alphanumeric Code
B. BCD
C. Excess 3
D. Gray
Which among the following anode current waveforms will have the minimum junction temperature?
A. 100% DC
B. 25% DC
C. 50% DC
D. AC
REVIEW IT BABY
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