LECTURER IN ELECTRONICS ENGINEERING -NCA- TECHNICAL EDUCATION

FINAL ANSWER KEY
Question Paper Code: 98/2017/OL
Category Code: 472/2016
Exam: Lecturer in Electronics Engineering(NCA)
Medium of Question: English
Date of Test 27-12-2017
Department Technical Education
Alphacode A

Question1:-Who launched Kudumbasree programmes in Kerala ?
A:-A.B. Vajpaye
B:-Man Mohan Singh
C:-Rajeev Gandhi
D:-Narendra Modi
Correct Answer:- Option-A

Question2:-Which governor General of India was responsible for the appointment of Hunter Commission , the first Indian
Education Commission of `3^(rd)` February 1882 ?
A:-Lord Lytton
B:-Lord Macaulay
C:-Lord Rippon
D:-Lord Curzon
Correct Answer:- Option-C

Question3:-Who established “Prathyaksha Raksha Daiva Sabha” on 1909 ?
A:-Pandit K.P. Karuppayyan
B:-Poikayil Yohannan
C:-Ayya Vaikunder
D:-Ayyankali
Correct Answer:- Option-B

Question4:-Which Travancore ruler proclaimed the historic temple entry proclamation on 1936 ?
A:-Sri Moolam Thirunal Marthanda Varma
B:-Uthradom Thirunal Marthanda Varma
C:-Sethu Lakshmi Bai
D:-Shri Chithirathirunal Balarama Varma
Correct Answer:- Option-D

Question5:-Who was the ‘Father of Malayalam Journalism’ ?
A:-Kesari Balakrishna Pillai
B:-Chengulathu Kunjirama Menon
C:-Kandathil Varghese Mappila
D:-T. Shiva Sankar
Correct Answer:- Option-B

Question6:-Who is known as ‘Kerala Kalidasan’ ?
A:-Thunchathu Ezhuthachhan
B:-S.K. Pottekkatt
C:-Kodungalloor Kunjikuttan Thampuran
D:-Kerala Varma Valiya Koil Thampuran
Correct Answer:- Option-D

Question7:-Who was the founder and editor of the journal called ‘Shreemathi’ ?
A:-Lalithambika Antharjanam
B:-Anna Chandi
C:-Akkamma Cheriyan
D:-Arya Pallam
Correct Answer:- Option-B

Question8:-Who wrote the biography ‘Kanneerum Kinavum’ ?
A:-E.M.S. Namboodirippad
B:-K.P. Kesava Menon
C:-Kumaranasan
D:-V.T. Bhattathirippad
Correct Answer:- Option-D

Question9:-Who was famous for his quotation “The whole universe is one mind between mind and mind there is no vacuum”
?
A:-Sree Narayana Guru
B:-Chattambi Swamikal
C:-Swami Vagbhadananda
D:-Ayya Vaikunder
Correct Answer:- Option-B

Question10:-Which was the highest literacy award in Kerala ?
A:-Odakuzhal Award
B:-Jnanpith Award
C:-Vallathol Award
D:-Ezhuthachan Award
Correct Answer:- Option-D

Question11:-If`[[x-y,z],[2x-y,w]]` =`[[-1,4],[0,5]]` , the value of `(x+y)/(z-w)` is
A:-3/2
B:-3
C:–3
D:-2
Correct Answer:- Option-C

Question12:-If `A_(ij)` is the co-factor of the element `a_(ij)` of the determinant then the
value of `a_(32)` `A_(32)` is
A:-110
B:–110
C:-22
D:–22
Correct Answer:- Option-A

Question13:-The `4^(th)` term of (3x- `(1)/(3x))^(6)` is
A:-20
B:–20
C:-20x
D:-`(20)/(x)`
Correct Answer:- Option-B

Question14:-If A + B = `45^(o)` then (1+tan A) (1+ tan B) is
A:–1
B:-3
C:-1
D:-2
Correct Answer:- Option-D

Question15:-The acute angle between the lines 3x + y -7 =0 and x+2y+9=0 is
A:-`45^(o)`
B:-`30^(o)`
C:-`60^(o)`
D:-`75^(o)`
Correct Answer:- Option-A

Question16:- is
A:-`(-3)/(sqrt(2))`
B:-`(3)/(sqrt(2))`
C:-`(sqrt(3))/(2)`
D:-`(sqrt(2))/(3)`
Correct Answer:- Option-B

Question17:-The equation of the normal to the curve x=2t, y=`(2)/(t)` at t = 1 is
A:-x = y
B:-x + y = 0
C:-x + y = 4
D:-x – y = 4
Correct Answer:- Option-A

Question18:-`int` `(2x^(4))/(1+x^(10)` dx is
A:-`(2)/(5)` `cot^(-1)` (`x^(5)`)+c
B:-`(2)/(5)` `sin^(-1)` (`x^(5)` )+c
C:-`(2)/(5)` `tan^(-1)` (`x^(5)` )+c
D:-`(2)/(7)` log(1+`x^(10)` )+c
Correct Answer:- Option-C

Question19:-The area included between one arch of the curve y=sin x and the x-axis is
A:–2
B:-2
C:-0
D:–1
Correct Answer:- Option-B

Question20:-The solution of `dy/dx` +`(2x)/(1+x^(2))` y=`(1)/(1+x^(2))` is`
`
A:-y=`x^(2)` +1+c
B:-y=`(c)/(x^(2)+1)`
C:-y=`tan^(-1)` x+c
D:-y=`(x+c)/(1+x^(2))`
Correct Answer:- Option-D

Question21:-_______________ amplifier is commonly used as a frequency multiplier.
A:-Class A
B:-Class B
C:-Class C
D:-All of the above
Correct Answer:- Option-C

Question22:-Removing bypass capacitor across the emitter-leg resistor in a CE amplifier causes
A:-Increase in current gain
B:-Decrease in current gain
C:-Increase in voltage gain
D:-Decrease in voltage gain
Correct Answer:- Option-D

Question23:-If the maximum collector current due to signal alone is 3mA, then zero signal collector current should be at
least equal to
A:-6mA
B:-2mA
C:-3mA
D:-1mA
Correct Answer:- Option-C

Question24:-In a multistage amplifier, the overall frequency response is determined by the
A:-Frequency response of each stage depending on the relationships of the critical frequencies
B:-Frequency response of the first amplifier
C:-Frequency response of the last amplifier
D:-Lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier
Correct Answer:- Option-A

Question25:-Halving the power corresponds to a ______________dB _____________
A:-10, decrease
B:-3, decrease
C:-3, increase
D:-10, increase
Correct Answer:- Option-B

Question26:-If negative feedback is introduced in amplifiers with shunt current configuration, the input resistance will
A:-Increase
B:-Remains the same
C:-Increase, decrease or remains the same depending on input
D:-Decrease
Correct Answer:- Option-D

Question27:-Pinch-off voltage`V_(p)` for an FET is the drain voltage at which
A:-Significant drain current starts flowing
B:-Drain current becomes zero
C:-All free charges get removed from the channel
D:-Avalanche break down takes place
Correct Answer:- Option-C

Question28:-Compared to bipolar transistor, a JFET has
A:-Higher input impedance and low voltage gain
B:-Lower input impedance and high voltage gain
C:-Higher input impedance and high voltage gain
D:-Lower input impedance and low voltage gain
Correct Answer:- Option-A

Question29:-Class AB operation is ______________ operation.
A:-similar to class A
B:-similar to class B
C:-similar to class C
D:-none of the above
Correct Answer:- Option-D

Question30:-The ripple factor of a full-wave rectifier circuit compared to that of a half wave rectifier circuit without filter is
A:-Half of that for a half wave rectifier
B:-Less than half that for a half-wave rectifier circuit
C:-Equal to that of a half wave rectifier
D:-None of the above
Correct Answer:- Option-B

Question31:-A capacitor is fully charged when
A:-The voltage across its plates is half of the voltage from ground to one of its plates
B:-The current through the capacitor is the same as when the capacitor is discharged
C:-The voltage across the plates is 0.707 of the input voltage
D:-The current through the capacitor is directly proportional to the area of the plates
Correct Answer:- Option-B
Question32:-The saturation condition of transistor implies that
A:-Collector current has highest possible value
B:-Entire Vcc gets dropped across load resistor
C:-It acts as a closed switch with negligible value of resistance
D:-All of the above
Correct Answer:- Option-D
Question33:-The output of a particular Op-amp increases 8V in 12`mu` s. The slew rate is
A:-90 V/`mu` s
B:-0.67 V/`mu` s
C:-1.5 V/`mu` s
D:-None of these
Correct Answer:- Option-B
Question34:-With zero volts on both inputs, an Op-amp ideally should have an output
A:-Equal to the positive supply voltage
B:-Equal to the negative supply voltage
C:-Equal to zero
D:-Equal to CMRR
Correct Answer:- Option-C
Question35:-Determine the output resistance of differential amplifier with three op-amp. The op-amp used in 741c, with A =
200000 and `R_(0)`. The output and difference of input voltages are 44 and 11.
A:-5.5 MΩ
B:-3.5 MΩ
C:-2.4 MΩ
D:-1.5 MΩ
Correct Answer:- Option-D
Question36:-The bandwidth of the differential amplifier increases, if the value of
A:-Open Loop Voltage Gain Decreases
B:-Closed Loop Voltage Gain Decreases
C:-Differential Voltage Gain Decreases
D:-All of the above
Correct Answer:- Option-B
Question37:-If the gain of a non-inverting averaging amplifier is one. Determine the input voltages, if the output voltage is
3v
A:-`V_(1)` =6v, `V_(2)` = 3v and `V_(3)` =2v
B:-`V_(1)` = 9v, `V_(2)` = 5v and `V_(3)` = -4v
C:-`V_(1)` =8v, `V_(2)` = -6v and `V_(3)` = 1v
D:-`V_(1)` = 7v, `V_(2)` = 4v and `V_(3)` = -3v
Correct Answer:- Option-D
Question38:-In differential op-amp configuration a subtractor is called as
A:-Scaling amplifier
B:-All of the mentioned
C:-Summing amplifier
D:-Difference amplifier
Correct Answer:- Option-A
Question39:-An ideal operational amplifier has
A:-Infinite output impedance
B:-Zero input impedance
C:-Infinite bandwidth
D:-All of the above
Correct Answer:- Option-C
Question40:-How the op-amp comparator should be choosen to get higher speed of operation ?
A:-Wider bandwidth
B:-High slew rate
C:-Large gain
D:-None of the above
Correct Answer:- Option-A
Question41:-The gain of the first order low pass filter
A:-Increases at the rate 20dB/decade
B:-Increases at the rate 40 dB/decade
C:-Decreases at the rate 20dB/decade
D:-Decreases at the rate 40dB/decade
Correct Answer:- Option-C
Question42:-The poles of the transfer function of normalized low pass butter worth filter exists
A:-On unit circle
B:-Outside unit circle
C:-Inside unit circle
D:-None of the mentioned
Correct Answer:- Option-A
Question43:-A stable multivibrator operating at 150 Hz has a discharge time of 2.5 ms. The duty cycle of the circuit is
A:-50%
B:-75%
C:-95.99%
D:-37.5%
Correct Answer:- Option-D
Question44:-Calculate the output frequency in a frequency multiplier if, fin = 200 Hz is applied to a 7 divide by N-network.
A:-1.2 kHz
B:-1.6 kHz
C:-1.4 kHz
D:-1.9 kHz
Correct Answer:- Option-C
Question45:-Convert binary 111111110010 to hexadecimal
A:-` E E2_(16)`
B:-`FF2_(16)`
C:-`2FE_(16)`
D:-`FD2_(16)`
Correct Answer:- Option-B
Question46:-Which gate is best used as a basic comparator ?
A:-NOR
B:-OR
C:-AND
D:-Exclusive-OR
Correct Answer:- Option-D
Question47:-A decoder can be used as a demultiplexer by
A:-tying all enable pins LOW
B:-tying all data-select lines LOW
C:-tying all data-select lines HIGH
D:-using the input lines for data selection and an enable line for data input
Correct Answer:- Option-D
Question48:-A binary code that progresses such that only one bit changes between two successive codes is
A:-Gray code
B:-8421 code
C:-Excess-3 code
D:-nine’s-complement code
Correct Answer:- Option-A
Question49:-A MOD-16 ripple counter is holding the count `1001_(2)`. What will the count be after 31 clock pulses.
A:-`1000_(2)`
B:-`1010_(2)`
C:-`1011_(2)`
D:-`1101_(2)`
Correct Answer:- Option-A
Question50:-Select the statement that best describes Read-Only Memory (ROM).
A:-Non-volatile, used to store information that changes during system operation
B:-Non-volatile, used to store information that does not change during system operation
C:-Volatile, used to store information that changes during system operation
D:-Volatile, used to store information that does not change during system operation
Correct Answer:- Option-B
Question51:-Which of the following logic families has the shortest propagation delay ?
A:-CMOS
B:-BiCMOS
C:-ECL
D:-TTL
Correct Answer:- Option-C
Question52:-A binary input 000 is fed to a 3 bit DAC/ADC. The resultant output is 101. Find the type of error ?
A:-Offset error
B:-Gain error
C:-Settling error
D:-Linearity error
Correct Answer:- Option-A
Question53:-The transmit buffer of serial data buffer is a
A:-Serial-in parallel-out register
B:-Parallel-in serial-out register
C:-Serial-in serial-out register
D:-Parallel-in parallel-out register
Correct Answer:- Option-B
Question54:-The register that provides control and status information about serial port is
A:-IP
B:-IE
C:-PCON and SCON
D:-TSCON
Correct Answer:- Option-C
Question55:-The instruction that performs logical AND operation and the result of the operation is not available is
A:-AAA
B:-AND
C:-XOR
D:-TEST
Correct Answer:- Option-D
Question56:-Which instruction cannot force the 8086 processor out of ‘halt’ state ?
A:-Hold
B:-Reset
C:-Interrupt request
D:-Both interrupt request and reset
Correct Answer:- Option-A
Question57:-What is the carrier frequency in an AM wave when its highest frequency component is 850 Hz and the
bandwidth of the signal is 50 Hz ?
A:-80 Hz
B:-695 Hz
C:-625 Hz
D:-825 Hz
Correct Answer:- Option-D
Question58:-A 100 MHz carrier is frequency modulated by 10 KHz wave. For a frequency deviation of 50 KHz, calculate the
modulation index of the FM signal.
A:-100
B:-50
C:-70
D:-90
Correct Answer:- Option-B
Question59:-After passing the FM signal through mixer, what is the change in the frequency deviation Δ when the
modulating frequency is doubled ?
A:-Becomes 2Δ
B:-Becomes Δ/2
C:-Becomes
D:-Remains unchanged
Correct Answer:- Option-D
Question60:-Pre emphasis is done
A:-For boosting of modulating signal voltage
B:-For modulating signals at higher frequencies
C:-In FM before modulation
D:-All of the above
Correct Answer:- Option-D
Question61:-What is the DFT of the four point sequence x(n) = {0, 1, 2, 3} ?
A:-{6, -2 + 2j-2, -2-2j}
B:-{6, -2-2j, 2, -2+2j}
C:-{6, -2+2j, -2, -2-2j}
D:-{6, -2-2j, -2,-2+2j}
Correct Answer:- Option-C
Question62:-Which kind of polarization is provided by helical antennas ?
A:-Circular
B:-Elliptical
C:-Plane circular
D:-All of the above
Correct Answer:- Option-A
Question63:-Which has same probability of error ?
A:-BPSK and QPSK
B:-BPSK and ASK
C:-BPSK and PAM
D:-BPSK and QAM
Correct Answer:- Option-C
Question64:-In MSK, the difference between the higher and lower frequency is
A:-Same as the bit rate
B:-Four time the bit rate
C:-Twice of the bit rate
D:-Half of the bit rate
Correct Answer:- Option-D
Question65:-The data rate of QPSK is _____________ of BPSK.
A:-Thrice
B:-Twice
C:-Four times
D:-Same
Correct Answer:- Option-B
Question66:-TDMA allows the user to have
A:-Use of same frequency channel for same time slot
B:-Use of same frequency channel for different time slot
C:-Use of same time slot for different frequency channel
D:-Use of different time slot for different frequency channels
Correct Answer:- Option-B
Question67:-Unauthorised access of information from a wireless device through a bluetooth connection is called“
A:-Bluesnarfing
B:-Bluemaking
C:-Bluestring
D:-None of the above
Correct Answer:- Option-A
Question68:-In a TWT the amplitude of resultant wave travelling down the helix
A:-Increases exponentially
B:-Increases linearly
C:-Decreases exponentially
D:-Is almost constant
Correct Answer:- Option-A
Question69:-If the gate current of an SCR is increased, the forward breakdown voltage will
A:-Increase
B:-Decrease
C:-Not be affected
D:-Become infinite
Correct Answer:- Option-C
Question70:-What is the range of the operating voltage level for LEDs ?
A:-5-12 mV
B:-1.7-3.3 V
C:-5-12 V
D:-20-25 V
Correct Answer:- Option-B
Question71:-To turn on UJT, the forward bias on the emitter diode should be ______________ the peak point voltage.
A:-Less than
B:-Equal to
C:-More than
D:-None of the above
Correct Answer:- Option-C
Question72:-The device that does not have the gate terminal is
A:-Triac
B:-FET
C:-SCR
D:-Diac
Correct Answer:- Option-D
Question73:-If the negative potential on the control grid of CRT is increased, the intensity of spot
A:-is increased
B:-is decreased
C:-remains the same
D:-none of the above
Correct Answer:- Option-B
Question74:-The sensitivity of a multimeter is given in
A:-Ω
B:-amperes
C:-kΩ/V
D:-none of the above
Correct Answer:- Option-C
Question75:-The controlling parameter in IGBT is the
A:-`I_(G)`
B:-`V_(GE)`
C:-`I_(C)`
D:-`V_(CE)`
Correct Answer:- Option-B
Question76:-In a loss less inverter, the average power absorbed in one period by the load must be
A:-Equal to the average power supplied by the dc source
B:-Greater than the average power supplied by the dc source
C:-Lesser than the average power supplied by the dc source
D:-Equal to the average power supplied by the ac source
Correct Answer:- Option-A
Question77:-A module in a solar panel refers to
A:-Series arrangement of solar cells
B:-Parallel arrangement of solar cells
C:-Series and parallel arrangement of solar cells
D:-None of the above
Correct Answer:- Option-C
Question78:-A laser diode normally emits
A:-Coherent and monochromatic light
B:-Coherent light
C:-Monochromatic light
D:-Neither coherent nor monochromatic light
Correct Answer:- Option-A
Question79:-The quality of output AC voltage of cycloconverter is improved with
A:-Increase in output voltage at reduced frequency
B:-Increase in output voltage at increased frequency
C:-Decrease in output voltage at reduced frequency
D:-Decrease in output voltage at increased frequency
Correct Answer:- Option-B
Question80:-With the increase in the intensity of light, the resistance of a photovoltaic cell
A:-Decreases
B:-Increases
C:-Remains same
D:-None of these
Correct Answer:- Option-A
Question81:-LED
A:-is usually made from Ge
B:-Uses a reverse biased junction
C:-Emits light due to recombination of holes and electrons
D:-Gives light output which increases with increase in temperature
Correct Answer:- Option-C
Question82:-SPST, SPDT, DPDT and DPST are
A:-Solid state relays
B:-Input-output interface modules
C:-Solid state switches
D:-Electrical relay contact types
Correct Answer:- Option-D
Question83:-The 8 bit micro controller has
A:-Data bus of 8 bits
B:-Address bus of 8 bits
C:-8K ROM
D:-Both data and address bus 8 bits
Correct Answer:- Option-A
Question84:-The additional features of 3G that are not available with 2G are
i) Mobile TV
ii) MMS
iii) Video transfers
iv) GPS
A:-i, ii, iii
B:-i, iii, iv
C:-ii, iii, iv
D:-i, ii, iii, iv
Correct Answer:- Option-B
Question85:-5Ah in an UPS battery specification means
A:-5A for 1 hour
B:-1A for 5 hours
C:-The output power is 5 watts
D:-It requires 5 hours to charge fully
Correct Answer:- Option-A
Question86:-The 43-grade cement means that the compressive strength of the cement mortar cube after 28 days is
A:-43 GPa
B:-43 Pa
C:-43 MPa
D:-None of the above
Correct Answer:- Option-C
Question87:-The process of establishing intermediate points on a survey line joining the end points is called
A:-Chaining
B:-Ranging
C:-Pacing
D:-Surveying
Correct Answer:- Option-B
Question88:-Choice of type of foundation depends on
A:-Soil type
B:-Super imposed load
C:-Material used
D:-All the above
Correct Answer:- Option-D
Question89:-The following one is an example of electronic distance meter
A:-Total station
B:-Distomat
C:-Electronic theodolite
D:-Tacheometer
Correct Answer:- Option-B
Question90:-The manufacturing process of concrete is in the following order
A:-Proportioning, batching, mixing, transporting, placing, compacting and curing
B:-Proportioning, mixing, batching, transporting, placing, compacting and curing
C:-Proportioning, mixing, batching, transporting, placing, curing and compacting
D:-Proportioning, transporting, mixing, batching, placing, compacting and curing
Correct Answer:- Option-A
Question91:-In a four stroke cycle engine, the cam shaft completes
A:-Half the revolution of crank shaft
B:-Twice the revolutions of crank shaft
C:-The same revolutions as crank shaft
D:-Revolutions irrespective of crank shaft revolutions
Correct Answer:- Option-A
Question92:-The thermal efficiency of a four stroke petrol engine as compared to two stroke petrol engine is
A:-Less
B:-More
C:-Same for same speed
D:-Same for same compression ratio
Correct Answer:- Option-B
Question93:-While starting the engine, the pinion gear of the starter motor meshes with
A:-Fly wheel ring gear
B:-Gears in gear box
C:-Gears in differential
D:-None of these
Correct Answer:- Option-A
Question94:-Rankine cycle consists of
A:-Two isothermal processes and two constant pressure processes
B:-Two isothermal processes and two constant volume processes
C:-Two isentropic processes and two constant volume processes
D:-Two isentropic processes and two constant pressure processes
Correct Answer:- Option-D
Question95:-The correct order of the path of flue gas is
A:-superheater, economiser, precipitator, air preheater
B:-superheater, precipitator, economiser, air preheater
C:-superheater, economiser, air heater, precipitator
D:-superheater, air preheater, economiser, precipitator
Correct Answer:- Option-C
Question96:-A DC source is supplying two resistors connected in parallel. If `R_(1)` = `2R_(2)`, determine the relation
between the power dissipated in them
A:-`P_(1)` =`0.5 P_(2)`
B:-`P_(1)` =`P_(2)`
C:-`P_(1)` =`2 P_(2)`
D:-`P_(1)` =` ` `4 P_(2)`
Correct Answer:- Option-A
Question97:-If an ac voltage source of magnitude 100`sqrt(2)` sinwt is causing a current flow of 10 sin (wt-45) A, determine
the load.
A:-10+j10Ω
B:-10-j10Ω
C:-10`sqrt(2)` +j10`sqrt(2)`Ω
D:-10`sqrt(2)` -j10`sqrt(2)`Ω
Correct Answer:- Option-A
Question98:-Which one among the following is not an over voltage protective system ?
A:-Lightning arrester
B:-Arcing horn
C:-Surge arrestor
D:-Earth-leakage circuit breaker
Correct Answer:- Option-D
Question99:-If a dielectric slab of thickness ‘t’ relative permeability of 2 is inserted between the parallel plates of an air
capacitor, the capacitance of the new arrangement will
A:-Not change
B:-Decrease
C:-Increase
D:-Become zero
Correct Answer:- Option-C
Question100:-Which one among the following is not a transmission voltage in Kerala ?
A:-33 kV
B:-55 kV
C:-220 kV
D:-400 kV
Correct Answer:- Option-B