Junior Instructor Electronic Mechanic 547/2017 Answer Key 79/2018

Post: Junior Instructor (Electronic Mechanic)
Department: Industrial Training
Category Code: 547/17
Qualification: S.S.L.C + Diploma in the appropriate branch of Engineering / National Trade Certificate
Question Paper Code: 79/18
Date of Test: 20-07-2018

If you find mistakes, comment below

A resistor with colour coded value of 1000 ohms and ± 20% tolerance can have an actual resistance between
- 980 Ohm and 1020 Ohm
- 800 Ohm and 1000 Ohm
- 1000 Ohm and 1200 Ohm
- 800 Ohm and 1200 Ohm
For a carbon-composition resistor colour coded with Yellow, Violet, Orange and Silver stripes left to right, the resistance and tolerance are
- 470 Ohms ± 5%
- 47 Kilo Ohm ± 10%
- 47 Mega Ohms ± 5%
- 4700 Ohms ± 10%
Five Capacitors each of 5 µF are connected in parallel, the equivalent capacitance will be
- 25 µF
- 15 µF
- 1 µF
- 10 µF
The resistance of a conductor of diameter D and length L is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
- R Ω
- 2R Ω
- 4R Ω
- 8R Ω
The electrical energy consumed by a coil is stored in the form of :
- An electrical field
- A force field
- An electrostatic field
- A magnetic field
In a purely inductive circuit
- Current leads voltage by 90°
- Voltage lags current by 90°
- Voltage leads current by 90°
- Voltage and Current are in Phase (0°)
A semiconductor has ______ Valence Electrons.
- 5
- 6
- 4
- 3
The strength of a semiconductor crystal comes from ______.
- Forces between Protons
- Forces between Nuclei
- Electron-Pair Bonds
- None of these
If Doping level of a crystal diode is increased, the breakdown voltage ______.
- is increased
- is decreased
- remains the same
- None of these
A Zener diode has ______.
- One PN Junction
- Two PN Junction
- Three PN Junction
- Four PN Junction
Fermi level for extrinsic semiconductor depends on
- Donor Element
- Impurity Concentration
- Temperature
- All of these
What is the maximum power rating for light emitting diodes?
- 150 mW
- 300 mW
- 500 mW
- 5 mW
A Transistor is a ______ operated device.
- Voltage
- Current
- Both Voltage and Current
- None of these
The Operation of JFET involves
- Flow of minority Carriers
- Flow of majority Carriers
- Recombination
- None of these
When transistors are used in digital circuits they usually operate in the :
- Active Region
- Saturation and Cutoff Regions
- Breakdown Region
- Linear Region
If a 2 mV signal produces a 2V output, what is the Voltage Gain?
- 0.001
- 100
- 1000
- 0.004
Least Distortion in the Output of a Power amplifier occurs in
- Class A
- Class B
- Class AB
- Class C
In a Class C Amplifier
- Efficiency and distortion both are maximum.
- Efficiency and distortion both are minimum.
- Efficiency maximum but distortion minimum.
- Efficiency minimum but distortion maximum.
The Cut in Voltage of a Germanium junction diode is
- 0.1V
- 0.3V
- 0.7V
- 1V
Which among the following does not belong to the category of LC oscillator?
- Hartley oscillator
- Colpitts oscillator
- Wein bridge oscillator
- Clapp oscillator
Why is the practical value of | Ab | considered to be slightly greater than one in oscillators?
- To compensate for non-linearities existing in the circuit.
- To compensate for phase shifting of two relevant signals upto 180°.
- To compensate for the change in feedback voltage.
- To compensate for noise voltage.
The RC network of a Wien Bridge Oscillator consists of R1=R2=10 KΩ and C1=C2=1000nF. The frequency of oscillation is :
- 15.9 Hz
- 159.12 Hz
- 180 Hz
- 15915 Hz
Which of the following oscillator will give most stable output oscillation frequency?
- Colpitts oscillator
- Hartley oscillator
- Crystal oscillator
- RC phase shift oscillator
Which Number System has a base of 16?
- Hexadecimal
- Octal
- Decimal
- Binary
Which of these sets of Logic Gates are designated as Universal Gates?
- NOR, NAND, XNOR
- NOR, NAND, AND
- OR, NOT, AND
- NOR, NAND
In a 1 to 4 De multiplexer, how many select inputs lines are required?
- 2
- 3
- 4
- 5
The Decimal equivalent of (110011.110)₂ is
- 25.375
- 25.175
- 25.250
- 25.750
Question Error
The Gray code representation of 15 is
- 1001
- 1000
- 1100
- None of these
Which of the following expressions is in the Sum-Of-Products (SOP) form?
- (A + B)(C + D)
- B(CD)
- AB + CD
- All
The Terminal count of a modulus-10 binary counter is
- 1010
- 1001
- 1000
- 1011
A simple Flip-Flop is
- 1 Bit Memory
- 2 Bit Memory
- 3 Bit Memory
- None of these
Which of the following is not a weighted code?
- BCD
- EXCESS-3 CODE
- 8421
- 6421
A Karnaugh map (K-map) with 4 Variables has ________ cells.
- 2
- 8
- 16
- 32
A counter is a :
- Sequential Circuit
- Combinational Circuit
- Both Combinational and Sequential Circuit
- None of these
Which one of the following Logic Family IC is fastest?
- TTL
- ECL
- DTL
- CMOS
In D flip-flop, ____ after the propagation delay.
- Input Follows Input
- Output Follows Output
- Output Follows Input
- Input Follows Output
The Op-Amp can Amplify
- A.C. Signals only
- D.C. Signals only
- Both A.C. and D.C. Signals
- Neither D.C. nor A.C. Signals
The Ideal Op-Amp has the following characteristics :
- RI=∞, A=∞,R0=0
- RI=0, A=∞, R0=0
- RI=∞, A=∞, R0=∞
- RI=0, A=∞, R0=∞
Differential Amplifiers are used in
- Buffers
- Voltage Followers
- Voltage Regulators
- Instrumentation Amplifiers
What would be a typical value for the unity-gain bandwidth of a 741 Operational Amplifier?
- 10³
- 10⁴
- 10⁵
- 10⁶
The Open-Loop Gain of an Op-Amp is 105. An Input Signal of 1mV is applied to the Inverting input with the Non-Inverting connected to the ground. The Supply Voltage is ± 10V. The Output of the Amplifier will be close to :
- + 100V
- – 100V
- + 10V
- – 10V
Which of the following is Hardware Interrupts?
- RST5.5, RST6.5, RST7.5
- INTR
- TRAP
- All of these
Which Stack is used in 8085?
- FIFO
- LIFO
- FILO
- None of these
What is mean by ALU?
- Arithmetic Logic Upgrade
- Arithmetic Logic Unsigned
- Arithmetic Logic Signed
- Arithmetic Logic Unit
The 8051 Microcontroller is of ______ Pin Package and a ______ Processor.
- 30, 1 byte
- 20, 1 Byte
- 40, 8 Bit
- 40, 8 Byte
What is the function of the Watchdog Timer?
- The Watchdog Timer is an external timer that resets the system if the software fails to operate properly.
- The Watchdog Timer is an internal timer that sets the system if the software fails to operate properly.
- The Watchdog Timer is an internal timer that resets the system if the software fails to operate properly.
- None of these
Which of the following instruction perform as of indirect RAM to Accumulator?
- MOV A, Rn
- MOV Rn, A
- MOV @R1, A
- MOV A, @R1
When the 8051 is reset and the EA line is low, the program counter points to the first program instruction in the :
- Internal Code Memory
- Internal Data Memory
- External Code Memory
- External Data Memory
An alternate function of port pin p3.0 (Rxd) in the 8051 is :
- Serial Port Input
- Serial Port Output
- Memory Write Strobe
- Memory Read Strobe
Clamper is also known as
- Charger
- Clipper
- Rectifier
- DC Restorer
Vestigial Type Modulation gives :
- High SNR
- Low Bandwidth
- Wide Bandwidth
- FM
Receiving Antenna for TV is normally
- Loop Antenna
- Parabolic Reflector
- Yagi Antenna
- Folded Dipole
Pre-emphasis is used to
- Increase RF Power
- Convert FM into PM
- Improve SNR
- Correct AM into AM VSB
Sensitivity of Microphone is determined by measuring the ______
- Output voltage at a given sound pressure
- Output current at a given sound pressure
- Output voltage and current at a given sound pressure
- None of these
Basic Principles of producing moving pictures is based on :
- Continuity
- Illusion of Continuity
- Both 'Continuity' and 'Illusion of Continuity'
- None of these
Principle of VIDICON camera tube is based on
- Photo Emission Effect
- Photo Conduction Effect
- Field Effect
- Photo Voltaic Effect
A PIN Diode is frequently used as a
- Peak Clipper
- Harmonic Generator
- Voltage Regulator
- Switching Diode for frequencies up to GHZ range
For proper working of a clamper, time constant of the circuit should be
- Large
- Small
- Equal To Signal Time Period
- Greater Than 5 Times Signal Time Period
A UJT has Rbb=10 KΩ and Rb2 = 4 KΩ. Its intrinsic standoff ratio is
- 0.6
- 0.4
- 2.5
- 5/3
The main purpose of modulation is to
- Combine two waves of different frequencies
- Achieve wave shaping of the carrier wave
- Transmitting low frequency information over long distance efficiently
- Produce side bands
In AM, the power content of the carrier is maximum when m equals to
- 0
- l
- 0.8
- 0.5
In the context of IC fabrication, metallisation means
- Connecting metallic wires
- Forming interconnecting conducting patterns
- Covering with a metallic cap
- All of these
Commonly used ICs are ___________.
- Thin Film
- Monolithic
- Hybrid
- None of these
An Audio Amplifier IC is an example of
- Digital IC
- Linear IC
- Both Digital IC and Linear IC
- None of these
LM317 Voltage Regulator, what is the minimum value of voltage required between its input and output in order to supply power to an internal circuit?
- 1V
- 3V
- 5V
- 10V
What is PSRR Value of an Ideal Op-Amp?
- 0
- Unity
- Infinite
- Unpredictable
In PLL, the capture range is always _______the lock range.
- Greater than
- Less than
- Equal to
- None of these
What is the nature of Radiation Pattern of an Isotropic Antenna?
- Dough-Nut
- Elliptical
- Hyperbolic
- Spherical
Which among the following is not a disadvantage of Rhombic Antenna?
- Requirement of large space
- Reduced transmission efficiency
- Wastage of power in terminating resistor
- Maximum radiated power along main axis
If an Antenna draws 12A current and radiates 4KW, then what will be its Radiation Resistance?
- 22.22 Ω
- 27.77 Ω
- 33.33 Ω
- 39.77 Ω
The general arrangement of PLA is
- AND/OR structure
- OR/AND structure
- NAND/NOR structure
- EX-OR/OR structure
Serial access memory at the chip level is classed as memory that has
- Shift Registers
- Counters
- Access time is independent of location of data
- Internally stored data is used
The FPGA refers to
- First Programmable Gate Array
- First Program Gate Array
- Field Program Guard Array
- Field Programmable Gate Array
The Full Form of VLSI is
- Very Large Scale Integration
- Very Least Scale Integration
- Very Long Single Integration
- None of these
VHDL is being used for
- Documentation
- Verification
- Synthesis of Large Digital Design
- None of these
Which of the following has the capability to store the information permanently?
- RAM
- ROM
- Both RAM and ROM
- None of these
In a Computer, Registers are present
- Within Control Unit
- Within RAM
- Within ROM
- Within CPU
The capacity of a memory unit is
- The number of binary input stored
- The number of words stored
- The number of bytes stored
- None of these
Speed of Data Transmission in 4-G Network of Telecom is
- 386 Kbps - 2 Mbps
- 2 Mbps
- 100 Mbps - 1 Gbps
- 2 Mbps - 1 Gbps
The sequence of operations in which Pulse Code Modulation is
- Sampling, quantizing, encoding
- Sampling, encoding quantizing,
- Quantizing, sampling, encoding
- None of these
What was the name of the horse of Shivaji?
- Chetak
- Kanthaka
- Pancha Kalyani
- Bousephallus
Which animal is known as “Living Fossil”?
- Beaver
- Legur
- Tiger
- Panda
Question Error
Which of the following day observed as “World Asthma Day” in 2017?
- June 23
- May 2
- December 18
- October 13
Which blood group is without Antigen?
- B
- A
- O
- AB
The study of flags is known as
- Terttology
- Rynology
- Polmology
- Vexillology
Which year Malayali Memorial submitted?
- 1891
- 1896
- 1897
- 1900
Who was famous for woman activities of Kerala Mahila Desa Sevika Sangh?
- Lalitha Prabhu
- Arya Pallam
- A.V. Kuttimalu Amma
- Anna Chandi
The World Alzheimer’s day is observed on
- October 21
- August 29
- September 21
- September 14
Savithrikutty Adava Vidava Vivaham is a
- poem
- novel
- drama
- critic
Who founded Satya Shodhak Samaj?
- Bhasker Rao Jadav
- Gopal Deshmukh
- Dayanand Saraswati
- Jyotiba Phule
Who is known as “Grand Old man of India”?
- Bankim Chandra Chatterji
- Dadabhai Naoroji
- Ram Mohan Roy
- Madan Mohan Malaviya
“It was a post dated cheque on a crashing bank” – the statement related to
- Communal Award
- Wavell Plan
- Cripp’s Mission
- Cabinet Mission Plan
The Viceroy who forward the proposal of August Offer in 1940 was
- Lord Wellington
- Lord Linlithgow
- Lord Dufferin
- Lord Mayo
Who was the founder of Khudai Khitmatgar Organisation?
- Shaukat Ali Ansari
- Khan Abdul Qayyum Khan
- Muhammed Ali Jinnah
- Khan Abdul Gaffar Khan
The first secretary of S.N.D.P. Yogam :
- Kumaran Asan
- Dr. Palpu
- Sree Narayana Guru
- Vellappilly Nadesan
The Perinad ryot happened in
- 1911
- 1915
- 1913
- 1904
Baba Amte related to
- Narmada Bachao Andolan
- Chipko Movement
- Bishnoi Movement
- Garhwal Himalayas
Who wrote the book “Silent Spring”?
- Robert Redford
- Ralph Nader
- Sunderlal Bahuguna
- Rachel Carson
What is the name of the Atom bomb laid in Nagasaki on August 9th 1945?
- Litty boy
- Fatty man
- Little boy
- Fat man
Which day is observed as Zero Emissions Day?
- 21st September
- 8th June
- 12th November
- 11th July

Junior Instructor Electronic Mechanic 547/2017 Answer Key 79/2018

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