JUNIOR INSTRUCTOR- TECHNICAL POWER ELECTRONICS SYSTEM- INDUSTRIAL TRAINING

PROVISIONAL ANSWER KEY
Question Paper Code: 78/2017/OL
Category Code: 468/2016
Exam: Junior Instructor-Technical Power Electronics
System
Medium of Question: English
Date of Test 19-09-2017
Department Industrial Training Department
Alphacode A
Question1:-During which decade did India see a negative population growth?
A:-1871-81
B:-1911-21
C:-1921-31
D:-1941-51
Correct Answer:- Option-B
Question2:-Kharif Crops are harvested in
A:-October-November
B:-June-July
C:-March-April
D:-January-February
Correct Answer:- Option-A
Question3:-Fiscal policy in India is formulated by
A:-The Reserve Bank of India
B:-The Planning Commission
C:-The Finance Ministry
D:-None of these
Correct Answer:- Option-C
Question4:-On which date Indian Independence Act of 1947 got royal assent?
A:-19th June 1947
B:-1st August 1947
C:-10th August 1947
D:-18th July 1947
Correct Answer:- Option-D
Question5:-Who among the following is known as ”Mother of Indian Revolution”?
A:-Bhikaji Rustam Kama
B:-Sarojini Naidu
C:-Aruna Asaf Ali
D:-Suchetha Kripalani
Correct Answer:- Option-A
Question6:-In which five year plan India opted for mixed economy?
A:-Fourth
B:-Third
C:-First
D:-Second
Correct Answer:- Option-D
Question7:-Which district in Kerala leads in the production of cashew nuts?
A:-Kollam
B:-Wayanad
C:-Kannur
D:-Kozhikkode
Correct Answer:- Option-C
Question8:-Father of local self government in India
A:-Lord Canning
B:-Lord Rippon
C:-Lord Lytton
D:-Lord Wellesley
Correct Answer:- Option-B
Question9:-How many times Gandhiji visited Kerala?
A:-Two times
B:-Four times
C:-Five times
D:-Three times
Correct Answer:- Option-C
Question10:-Who was the first Portuguese Viceroy in Kerala?
A:-Vascoda Gama
B:-Nicolo Conti
C:-Albuqurque
D:-Almeida
Correct Answer:- Option-D
Question11:-The 2017 Udyanotsav festival was held in which of the following cities?
A:-Jaipur
B:-New Delhi
C:-Mysore
D:-Ooty
Correct Answer:- Option-B
Question12:-Who has won the 2017 Men’s Singles Australian Open Tennis tournament?
A:-Roger Federer
B:-Andy Murray
C:-Rafeal Nadal
D:-Noval Djokovic
Correct Answer:- Option-A
Question13:-Which of the following state has attained 100% Aadhaar saturation in India?
A:-Tamil Nadu
B:-Kerala
C:-Himachal Pradesh
D:-Assam
Correct Answer:- Option-C
Question14:-Which among the following is known as ”Sairandhri Vanam”?
A:-Periyar National Park
B:-Silent Valley National Park
C:-Shenthurani National Park
D:-Mudumalai National Park
Correct Answer:- Option-B
Question15:-Who wrote the famous book ”We the People”?
A:-R.K. Laxman
B:-Chethan Bhagath
C:-Arundhathi Roy
D:-Nani Palkhivala
Correct Answer:- Option-D
Question16:-Who was the founder President of NSS?
A:-K. Kelappan
B:-Mannathu Padmanabhan
C:-Kontoor Krishnapillai
D:-Valparambil Valayudha Pillai
Correct Answer:- Option-A
Question17:-Who called Sree Narayana Guru as the ”Second Buddha”?
A:-Chattampi Swamikal
B:-G. Sankara Kurup
C:-Vakkom Abdhul Khader Moulavi
D:-Vagbhadananda
Correct Answer:- Option-B
Question18:-The social reformer who said ”Mind is God”?
A:-Brahmananda Shivayogi
B:-Pandit Karuppan
C:-Poikayil Yohannan
D:-Thycaud Ayya
Correct Answer:- Option-A
Question19:-The headquarters of ”Prathyaksha Raksha Daiva Sabha”
A:-Kottayam
B:-Neyyattinkara
C:-Eraviperoor
D:-Kainakari
Correct Answer:- Option-C
Question20:-Who started the publication journal called ”Abhinava Kerala”?
A:-Nadaraja Guru
B:-Dr. Palpu
C:-Kumaranasan
D:-Vagbhadananda
Correct Answer:- Option-D
Question21:-Silicon has an atomic number of 14, this means the atom has 14 ____________.
A:-Neutrons
B:-Electrons
C:-Protons and neutrons combined together
D:-Valence electrons
Correct Answer:- Option-B
Question22:-The most commonly used electrical conductor is ___________.
A:-Lead
B:-Tin
C:-Brass
D:-Copper
Correct Answer:- Option-D
Question23:-The opposition offered to the movement of electrons/current flow is known as __________.
A:-Electric resistance
B:-Current
C:-Voltage
D:-None of these
Correct Answer:- Option-A
Question24:-In a meter one main scale division is 5 volts, and it is divided into 10 small scale divisions. The meter can
measure a minimum voltage of _____________.
A:-5 V
B:-0.5 V
C:-0.1 V
D:-1 V
Correct Answer:- Option-B
Question25:-As the field intensity (H) in the core is increased, the flux density (B) ___________.
A:-Increases
B:-Decreases
C:-Becomes zero
D:-Does not change
Correct Answer:- Option-A
Question26:-Material which can be strongly magnetised are known as ____________ materials.
A:-Paramagnetic
B:-Diamagnetic
C:-Ferro magnetic
D:-Pure magnet
Correct Answer:- Option-C
Question27:-What material is used for making armature core?
A:-Silicon steel
B:-Aluminium
C:-Copper
D:-Mild steel
Correct Answer:- Option-A
Question28:-The speed of a universal motor ____________.
A:-Remains constant to the applied load
B:-Is directly proportional to the applied load
C:-Is inversely proportional to the applied load
D:-Becomes zero when load is applied
Correct Answer:- Option-C
Question29:-The basic unit of inductance is ___________.
A:-Farad
B:-Webber
C:-Henry
D:-Hertz
Correct Answer:- Option-C
Question30:-Inductive reactance of a coil is directly proportional to the ___________.
A:-Alternating current following through it
B:-Induced emf in it
C:-Frequency of AC flowing through it
D:-All the parameters mentioned at A, B and C
Correct Answer:- Option-D
Question31:-Two capacitors C1 = 1 nf and C2 = 10 nf, are connected in series and applied to the battery voltage V = 11 V.
What are the voltages across the capacitors?
A:-VC1 = 5.5 V; VC2 = 5.5 V
B:-VC1 = 10 V; VC2 = 1 V
C:-VC1 = 1 V; VC2 = 10 V
D:-VC1 = 0 V; VC2 = 11 V
Correct Answer:- Option-B
Question32:-Mutual induction is obtained by placing two current carrying coils ___________.
A:-Side by side close to each other
B:-Perpendicular to each other
C:-Far away from each other
D:-Both (1) and (2) above
Correct Answer:- Option-A
Question33:-The fundamental unit of measurement of resistance is ____________.
A:-Ohm
B:-Milli ohm
C:-Kilo ohm
D:-Mega ohm
Correct Answer:- Option-A
Question34:-For measuring unknown resistance, initially choose ____________.
A:-The highest ohms range
B:-The lowest ohms range
C:-Any ohms range
D:-R × 10 ohms range
Correct Answer:- Option-A
Question35:-When three resistors R1, R2 and R3 are connected in series, the total resistance `”R_T” =`
A:-R1 + R2 + R3
B:-R1 × R2 × R3
C:-1/R1 + 1/R2 + 1/R3
D:-1/R1 × 1/R2 × 1/R3
Correct Answer:- Option-A
Question36:-Magnetic lines are concentrated at ___________.
A:-At the centre of magnet
B:-Any one end of the magnet
C:-Along the magnet uniformly
D:-Both the ends of the magnet
Correct Answer:- Option-D
Question37:-Generation and distribution of AC power in India is normally ___________.
A:-Single phase
B:-3 phase
C:-2 phase
D:-Either 2 phase or 3 phase
Correct Answer:- Option-B
Question38:-The principle of operation of universal motor, similar to __________.
A:-DC shunt motor
B:-DC series motor
C:-DC short-shunt compound motor
D:-DC long-shunt compound motor
Correct Answer:- Option-B
Question39:-The flux density of a coil can be increased by inserting a __________.
A:-Brass core
B:-Iron core
C:-Rubber core
D:-Plastic core
Correct Answer:- Option-B
Question40:-The frequency of induced emf in an AC generator is given by ___________.
A:-120/PN
B:-120P/N
C:-PN/120
D:-120N/P
Correct Answer:- Option-C
Question41:-A charged capacitor acts like a ____________.
A:-Temporary voltage source
B:-Magnetic energy source
C:-Constant current source
D:-Switch
Correct Answer:- Option-A
Question42:-The relation between frequency of an AC signal (F) and time period (T) is __________.
A:-`”F=T^2″`
B:-F = 2T
C:-F = 1/T
D:-F = 1/2T
Correct Answer:- Option-C
Question43:-A motor converts electrical energy into _____________.
A:-Magnetic energy
B:-Mechanical energy
C:-Potential energy
D:-Chemical energy
Correct Answer:- Option-B
Question44:-When 2 inductors are in parallel, the effective value of inductance is given by LT = __________.
A:-L1 + L2
B:-L1 × L2/L1 + L2
C:-L1 × L2
D:-L1 + L2/L1 × L2
Correct Answer:- Option-B
Question45:-A transformer is an electrical device used to __________.
A:-change the frequency of applied AC voltage
B:-transfer electrical energy from one circuit to another without any direct electrical connection
C:-convert applied DC into AC
D:-convert applied AC into DC
Correct Answer:- Option-B
Question46:-A 3-phase transformer has ____________.
A:-1 primary and 3 secondary windings
B:-3 primary and 1 secondary windings
C:-3 primary and 3 secondary windings
D:-3 primary and 6 secondary windings
Correct Answer:- Option-C
Question47:-A transformer has 800 turns in its primary winding and 200 in its secondary what is the primary voltage, if the
secondary voltage is 40 V? Assume transformer losses as negligible?
A:-8 V
B:-16 V
C:-40 V
D:-160 V
Correct Answer:- Option-D
Question48:-Efficiency of a transformer is the ratio of ___________.
A:-Output power to input power
B:-Input power to output power
C:-Input current to output current
D:-Output current to input current
Correct Answer:- Option-A
Question49:-The basic unit of capacitance is ____________.
A:-Ohm
B:-Farad
C:-Henry
D:-Mho
Correct Answer:- Option-B
Question50:-The relationship between charge (Q), voltage (V) and capacitance (C) of a capacitor is ____________.
A:-C = Q/V
B:-C = QV
C:-`”C=Q^2 V”`
D:-C = V/Q
Correct Answer:- Option-A
Question51:-Identify the instrument which is NOT used for measurement of capacitance _________.
A:-Digital capacitance meter
B:-AC bridge
C:-RLC meter
D:-Kelvin bridge
Correct Answer:- Option-D
Question52:-The capacitive reactance Xc is given by __________.
A:-2`Pi`FC
B:-1/2`Pi`FC
C:-2`Pi`/FC
D:-FC/2`Pi`
Correct Answer:- Option-B
Question53:-Current flowing through a capacitor is given by ___________.
A:-`”V.X_c”`
B:-`”V^2/X_c”`
C:-`”V/X_c”`
D:-`”V^2.C”`
Correct Answer:- Option-C
Question54:-A semi conductor in its pure form is referred to as __________.
A:-Intrinsic semiconductor
B:-Extrinsic semiconductor
C:-Crystal semiconductor
D:-Doped semiconductor
Correct Answer:- Option-A
Question55:-The process of adding impurities to a pure semiconductor __________.
A:-Diffusion
B:-Forming
C:-Etching
D:-Doping
Correct Answer:- Option-D
Question56:-The potential difference across a PN junction is referred to as _________.
A:-Potential difference
B:-Barrier potential
C:-Reverse potential
D:-PN potential
Correct Answer:- Option-B
Question57:-When a germanium diode is connected in forward biased mode the voltage across the diode will be ___________.
A:-0.7 V
B:-0.3 V
C:-Is equal to applied voltage
D:-0 V
Correct Answer:- Option-B
Question58:-When a diode is tested using an ohm meter. It indicates the low resistance in both direction. The condition of
the diode is ___________.
A:-Open
B:-Short
C:-Leaky
D:-Good
Correct Answer:- Option-B
Question59:-A forward biased diode starts conducting when the applied voltage reaches certain voltage known as
____________.
A:-End-in voltage
B:-Barrier voltage
C:-Peak voltage
D:-Saturation voltage
Correct Answer:- Option-B
Question60:-What value of the voltage is obtained directly from the wave form shown on a C.R.O when connected across
the secondary of a transformer?
A:-Peak value
B:-R.M.S. value
C:-Peak-to-peak value
D:-Average value
Correct Answer:- Option-C
Question61:-The main component used in a ripple filter circuit is the ___________.
A:-Capacitor
B:-Resistor
C:-Diode
D:-Transformer
Correct Answer:- Option-A
Question62:-The maximum forward current of an LED is about ____________.
A:-10 mA
B:-50 mA
C:-.5 A
D:-1.0 A
Correct Answer:- Option-B
Question63:-Which colour LED has the lowest forward voltage drop?
A:-Red
B:-Orange
C:-Green
D:-Yellow
Correct Answer:- Option-A
Question64:-The time taken for etching PCB is in the range of ___________.
A:-5 to 20 minutes
B:-20 to 40 minutes
C:-1 to 2 hours
D:-More than 2 hour
Correct Answer:- Option-A
Question65:-The PCB side on which components are mounted is referred to as ___________.
A:-Copper side
B:-Component side
C:-Solder side
D:-Track side
Correct Answer:- Option-B
Question66:-The chemical used for removing copper from copper clad boards is called __________.
A:-Thinner
B:-Remover
C:-Eraser
D:-Etchant
Correct Answer:- Option-D
Question67:-In amplifiers, transistors are used for ___________.
A:-Enlarging small electronic signals
B:-Switching purposes
C:-Reducing electronic signals
D:-Both the purposes mentioned in (1) and (2)
Correct Answer:- Option-A
Question68:-A transistor can be thought of as two PN junction diodes connected as ____________.
A:-PNPN
B:-PNNP
C:-NPNP
D:-NNPP
Correct Answer:- Option-B
Question69:-The advantage of transistors over vacuum tubes is ____________.
A:-Very small size
B:-Minimum power loss in the form of heat
C:-Low operating voltage
D:-All the three, mentioned above
Correct Answer:- Option-D
Question70:-NPN transistors are preferred to PNP transistors for ___________.
A:-Higher switching speed
B:-Easy use in +ve supply rail
C:-A wide range of operating temperature
D:-The reasons mentioned in (1) and (2)
Correct Answer:- Option-A
Question71:-Small signal amplifiers are also known as ___________.
A:-Large power amplifiers
B:-Medium power amplifiers
C:-Low power amplifiers
D:-Both medium power and low power amplifiers
Correct Answer:- Option-C
Question72:-In transistors, the width of the collector layer is __________.
A:-Much less than the base region
B:-Much wider than the base region
C:-Much less than the emitter region
D:-Same as that of the base region
Correct Answer:- Option-B
Question73:-The resistance measured by a multimeter between the anode and the cathode of good SCR should be
____________.
A:-Low
B:-Medium
C:-High
D:-Infinity
Correct Answer:- Option-D
Question74:-In speed control circuits for DC motors using two SCR’s _____________.
A:-Each SCR conducts at any time
B:-One SCR conducts in positive half cycle and the other in negative half cycle
C:-Both SCR’s conduct at a time
D:-Only one SCR conducts and the other does not conduct
Correct Answer:- Option-B
Question75:-Most common application of UJT is ____________.
A:-Schmitt trigger
B:-Bistable multivibrator
C:-Relaxation oscillator
D:-Timer
Correct Answer:- Option-C
Question76:-DIAC is basically ____________.
A:-A PNP/NPN transistor
B:-A PNP/NPN transistor with no base connection
C:-A 4 layered NPNP device
D:-None of the above
Correct Answer:- Option-B
Question77:-The speed of an AC motor can be controlled by using ____________.
A:-SCR
B:-TRIAC
C:-DIAC with SCR
D:-DIAC with TRIAC
Correct Answer:- Option-D
Question78:-A power MOSFET is capable to handle current upto ___________.
A:-1 A
B:-50 A
C:-10 A
D:-100 A
Correct Answer:- Option-D
Question79:-An IGBT is a hybrid form of ____________.
A:-A diode and a transistor
B:-A transistor and SCR
C:-A bipolar transistor and a MOSFET
D:-A FET and a MOSFET
Correct Answer:- Option-C
Question80:-MOSFET’s are used in ______________.
A:-Inverters
B:-SMPS
C:-UPS
D:-All the above
Correct Answer:- Option-D
Question81:-High speed switching can be obtained using a ____________.
A:-Power IGBT
B:-PNP transistor
C:-Diode
D:-Vibrator
Correct Answer:- Option-A
Question82:-Power MOSFET and power IGBT are __________
A:-One and the same device
B:-Quite different devices
C:-Similar semiconductor devices
D:-Replaceable devices
Correct Answer:- Option-C
Question83:-Which one of the following semiconductor device may be used as a light sensor?
A:-Photo diode
B:-Photo transistor
C:-LDR
D:-Any one of the above
Correct Answer:- Option-D
Question84:-The material used for making optic-fibre cable in general is ___________.
A:-Copper
B:-Transparent plastic
C:-Aluminium
D:-Steel
Correct Answer:- Option-B
Question85:-Which one of the following IC contains NOT gates ___________?
A:-IC 7400
B:-IC 7404
C:-IC 7402
D:-IC 7408
Correct Answer:- Option-B
Question86:-Which of the following gates gives a high output with all its inputs high
A:-NOT
B:-NOR
C:-OR
D:-X-OR
Correct Answer:- Option-C
Question87:-The logic gate which has ‘high’ output when its inputs are different is ___________.
A:-NOR
B:-EX-OR
C:-NAND
D:-EX-NOR
Correct Answer:- Option-B
Question88:-The biggest advantage of ECL is ___________.
A:-High fan out
B:-High speed
C:-Low power consumption
D:-High density
Correct Answer:- Option-B
Question89:-The term CMOS stands for
A:-Capacitance Metal Oxide Semiconductor
B:-Complimentary Metal Oxide Semiconductor
C:-Charged Metal Oxide Semiconductor
D:-Copper Metal Oxide Semiconductor
Correct Answer:- Option-B
Question90:-A BCD-to-Decimal decoder converts
A:-BCD code to decimal digits
B:-Binary code to decimal digits
C:-BCD code to binary code
D:-BCD code to grey code
Correct Answer:- Option-B
Question91:-The number of flip-flops required to construct a decade counter is ___________.
A:-2
B:-3
C:-4
D:-6
Correct Answer:- Option-C
Question92:-The number of NOR gates required to construct R-S flip-flop is ____________.
A:-1
B:-2
C:-3
D:-4
Correct Answer:- Option-B
Question93:-The basic building block of a counter is ___________.
A:-AND gate
B:-OR gate
C:-NAND gate
D:-Flip-flops
Correct Answer:- Option-D
Question94:-ROM is a non-volatile memory. The name of volatile memory is _______________.
A:-PROM
B:-SRAM
C:-EPROM
D:-RAM
Correct Answer:- Option-D
Question95:-Modern data storage device named ‘pen drive’ has a capacity of storing 16 GB data, what does it mean
A:-16 × `”10^9″` ` `bytes
B:-16 × `”10^6″` bytes
C:-16 × `”10^9″` bits
D:-16 × `”10^6″` bits
Correct Answer:- Option-A
Question96:-An OP-AMP is designed to amplify
A:-AC voltage
B:-DC voltage
C:-Both AC and DC voltage
D:-Pulse signals only
Correct Answer:- Option-C
Question97:-DC operating voltage of IC 555 is
A:-+5 to +18 V
B:-+18 to +36 V
C:-+5 to +28 V
D:-+18 to +48 V
Correct Answer:- Option-A
Question98:-Approximately what is the frequency limit of the optical fibre
A:-20 GHz
B:-1 MHz
C:-100 MHz
D:-40 GHz
Correct Answer:- Option-D
Question99:-The higher the index number of a fibre optic cable _____________.
A:-The higher the speed of light
B:-The lower the speed of light
C:-Has no effect on the speed of light
D:-The shorter the wavelength propagation
Correct Answer:- Option-B
Question100:-The three major groups in the optical system are
A:-The components, the data rate and response time
B:-The source, the link and the receiver
C:-The transmitter, the cable and the receiver
D:-The source, the link and the detector
Correct Answer:- Option-C