Junior Instructor-Lift and Escalator Mechanic-Industrial Training Department

PROVISIONAL ANSWER KEY
Question Paper Code: 3/2020/OL
Category Code: 095/2018
Exam: Junior Instructor-Lift and Escalator Mechanic
Medium of Question: English
Date of Test 22-01-2020
Department Industrial Training Department
Alphacode A
Question1:-The tool used for marking and testing of angles 90°
A:-Try-square
B:-Mitre square
C:-Bevel square
D:-Straight edge
Correct Answer:- Option-A
Question2:-Why rotatable bevels are used in dial indicator
A:-The work of machine setting
B:-Acts as an offset attachment
C:-Prevent shocks
D:-For making final zero setting
Correct Answer:- Option-D
Question3:-The connection link used to make a connection between sling and load to be lifted is
A:-Pulley
B:-Shackle
C:-Hoist
D:-Derricks
Correct Answer:- Option-B
Question4:-Rivet used for structural application is
A:-Pan head
B:-Snap head
C:-Mush room head
D:-Counter sunk head
Correct Answer:- Option-B
Question5:-The arc used in Electric Arc welding is
A:-Low voltage high current
B:-High voltage high current
C:-Low voltage low current
D:-High voltage low current
Correct Answer:- Option-A
Question6:-The flux used in brazing
A:-Zinc chloride
B:-Borax
C:-Ammonium chloride
D:-Alcohol
Correct Answer:- Option-B
Question7:-How many types of foundations are there based on depth?
A:-3
B:-4
C:-5
D:-2
Correct Answer:- Option-D
Question8:-Size of a wire rope specified by its.
A:-Nominal diameter
B:-Number of strands
C:-Number of wire per strand
D:-Length of wire
Correct Answer:- Option-A
Question9:-A hacksaw blade specified by its.
A:-Length
B:-Material
C:-Width
D:-Number of teeth
Correct Answer:- Option-A
Question10:-Which of the following is a solid lubricant?
A:-Copper
B:-Molybdenum
C:-Graphite
D:-Oil
Correct Answer:- Option-C
Question11:-While chipping the slag or grinding which is used to protect eyes.
A:-Dark glass
B:-Sun glass
C:-Mask
D:-Goggles
Correct Answer:- Option-D
Question12:-In which of the following drives there is no slip.
A:-Open belt drive
B:-Crossed belt drive
C:-Rope drive
D:-Chain drive
Correct Answer:- Option-D
Question13:-The point angle of centre punch is.
A:-30°
B:-45°
C:-90°
D:-120°
Correct Answer:- Option-C
Question14:-The welding process that uses non-consumable electrode is
A:-TIG welding
B:-MIG welding
C:-Manual Arc welding
D:-Submerged Arc welding
Correct Answer:- Option-A
Question15:-Washer is used to
A:-Fill up the axial gap
B:-Provide bearing area
C:-Provide cushioning effect
D:-Absorb shocks and vibrations
Correct Answer:- Option-B
Question16:-A flange coupling is used to connect two shafts
A:-Perfectly aligned
B:-Not in exact alignment
C:-Lateral misalignment
D:-Axes intersect at a small angle
Correct Answer:- Option-A
Question17:-What does COP stand for?
A:-Car Operating Pannel
B:-Clean Oil Pits
C:-Car Outside pannel
D:-Clean Outside Parts
Correct Answer:- Option-A
Question18:-What is the purpose of counter weight?
A:-Balance the weight of rope
B:-Balance the weight of car
C:-Control the door of the car
D:-Balance the weight of cables
Correct Answer:- Option-B
Question19:-The device designed to stop a descending car or counter weight beyond its normal limit.
A:-Returning cam
B:-Pit switch
C:-Buffer
D:-Header assembly
Correct Answer:- Option-C
Question20:-The elevator car is suspended on the main rope by means of a frame called.
A:-Sling
B:-Buffer
C:-Machine unit
D:-Car body
Correct Answer:- Option-A
Question21:-A device which acts as stopping mechanism when the elevator runs beyond its rated speed.
A:-Limit switch
B:-Over speed governor
C:-Hydraulic ram
D:-Traction sheave
Correct Answer:- Option-B
Question22:-One Micrometer is equal to.
A:-0.1mm
B:-0.01mm
C:-0.001mm
D:-0.0001mm
Correct Answer:- Option-C
Question23:-If the belt of an electric motor is broken, it needs the following type of maintenance
A:-Corrective
B:-Scheduled
C:-Preventive
D:-Timely
Correct Answer:- Option-A
Question24:-Type of maintenance is done before failure.
A:-Preventive
B:-Running
C:-Break down
D:-Scheduled
Correct Answer:- Option-A
Question25:-The device which connects the elevator car and landing doors without backlash.
A:-Door track
B:-Door coupler
C:-Door contact
D:-Door motor
Correct Answer:- Option-B
Question26:-It is used to know the elevator car position.
A:-Landing push button
B:-Floor position indicator
C:-Door contact
D:-Door sill
Correct Answer:- Option-B
Question27:-Which of the following is not a safety device on an elevator?
A:-Door lock
B:-Over speed governor
C:-Call button
D:-Limit switch
Correct Answer:- Option-C
Question28:-Compensating ropes are generally required on elevators when the travel is.
A:-5 M
B:-10 M
C:-20 M
D:-30 M or greater
Correct Answer:- Option-D
Question29:-A cylindrical rod with both ends threaded is known as.
A:-Bolt
B:-Tap bolt
C:-Stud
D:-Set-screw
Correct Answer:- Option-C
Question30:-Sliding part between elevator guide rail and car.
A:-Thimble rod
B:-Guide shoe
C:-Bulldog grip
D:-Safety edge
Correct Answer:- Option-B
Question31:-The elevator which is used to transport goods.
A:-Passenger elevator
B:-Service elevator
C:-Freight elevator
D:-Capsule elevator
Correct Answer:- Option-C
Question32:-A standard metric thread having 3 mm pitch on 40 mm diameter designated as.
A:-40 x 3m
B:-M40 x 3
C:-40 x 3
D:-M 403
Correct Answer:- Option-B
Question33:-Maximum travel height of a roped holeless hydraulic elevator is
A:-6 m
B:-9 m
C:-12 m
D:-18 m
Correct Answer:- Option-D
Question34:-To unlock door interlock when the cabin comes at the floor level in a manually operated doors.
A:-Returning cams
B:-Limit cam
C:-Toe guard
D:-Lock roller
Correct Answer:- Option-A
Question35:-The portion of a building or structure used for discharge of passenger or goods into or from a lift car.
A:-Lift door
B:-Lift beam
C:-Lift pit
D:-Lift landing
Correct Answer:- Option-D
Question36:-On a triple thread screw, lead equals.
A:-1/3 of pitch
B:-2/3 of pitch
C:-2/3 of pitch
D:-3 times of pitch
Correct Answer:- Option-D
Question37:-In a ball bearing balls are subjected to.
A:-Compressive stress
B:-Shear stress
C:-Fatigue
D:-Tensile stress
Correct Answer:- Option-C
Question38:-Bronze is welded by
A:-Neutral flame
B:-Carburizing flame
C:-Oxidizing flame
D:-All of these
Correct Answer:- Option-C
Question39:-The included angle of V- Belt is usally
A:-10° – 20°
B:-20° – 30°
C:-30° – 40°
D:-60° – 70°
Correct Answer:- Option-C
Question40:-Scaffolding method is used for travel up to.
A:-70 m
B:-60 m
C:-50 m
D:-40 m
Correct Answer:- Option-D
Question41:-A moving staircase which carries people between floors of building.
A:-Lift
B:-Escalator
C:-Hoist
D:-Derrick
Correct Answer:- Option-B
Question42:-Which of the following is a scalar quantity?
A:-Force
B:-Velocity
C:-Acceleration
D:-Speed
Correct Answer:- Option-D
Question43:-The side of an escalator extending above the step.
A:-Comb plate
B:-Lower landing
C:-Balustrade
D:-Upper landing
Correct Answer:- Option-C
Question44:-String cable is used to
A:-Prevent lifting of doors
B:-Connect two door panels
C:-Fixing header to wall
D:-Support travelling cable
Correct Answer:- Option-B
Question45:-Scribers are made of
A:-Cast iron
B:-Mild steel
C:-High carbon steel
D:-Brass
Correct Answer:- Option-C
Question46:-The part of the step where a passenger stands on escalator.
A:-Step tread
B:-Riser
C:-Skirt
D:-Truss
Correct Answer:- Option-A
Question47:-The point angle of the drill depends on the.
A:-RPM of drill
B:-Size of drill
C:-Size of the machine
D:-Material of work
Correct Answer:- Option-D
Question48:-File card is used for
A:-Cleaning the work piece
B:-Renew the file teeth
C:-Cleaning the file teeth
D:-Cleaning the chips
Correct Answer:- Option-C
Question49:-Mechanical device attached to the car frame or counter weight to stop and hold in the event of free fall
A:-Retiring cam
B:-Safety gear
C:-Over head pulley
D:-Buffer
Correct Answer:- Option-B
Question50:-Which device is used to mount the pulley on shaft?
A:-Key
B:-Belt
C:-Chain
D:-Flange
Correct Answer:- Option-A
Question51:-In terms of energy bands, semiconductors can be defined as those material which at room temperature have
A:-Partially filled conduction band
B:-Partially filled valance band
C:-A very narrow energy gap
D:-All of the above
Correct Answer:- Option-D
Question52:-In an N type semiconductor there are
A:-No minority carriers
B:-Immobile negative ions
C:-Immobile positive ions
D:-holes as majority carriers
Correct Answer:- Option-C
Question53:-A square wave oscillator is
A:-Bistable multivibrator
B:-An Astable multivibrator
C:-A Monostable multivibarator
D:-None of the above
Correct Answer:- Option-B
Question54:-In a transistor the reverse saturation current ICo
A:-Doubles for every 10°C rise in temperature
B:-Doubles for every 1°C rise in temperature
C:-Increase linearly with temperature
D:-Doubles for every 15°C rise in temperature
Correct Answer:- Option-A
Question55:-An SCR can be turned OFF by
A:-Removing the gate voltage
B:-Reducing the Anode to Cathode voltage
C:-Reducing the Anode current below the holding current
D:-All of the above
Correct Answer:- Option-C
Question56:-DIAC is a
A:-One terminal device
B:-Two terminal device
C:-Three terminal device
D:-Four terminal device
Correct Answer:- Option-B
Question57:-Which one of the following is not a characteristics of the UJT
A:-Negative resistance
B:-Intrinsic stand off ratio
C:-Gate current
D:-Peak point voltage
Correct Answer:- Option-C
Question58:-A TRIAC can be triggered
A:-Only by the positive half cycle of the supply
B:-Only by the negative half cycle of the supply
C:-By positive & negative cycle of the supply
D:-None of the above
Correct Answer:- Option-C
Question59:-The procedure used for controlling the speed of a 3 phase induction motor is
A:-Fixed voltage -variable frequency method
B:-variable voltage -fixed frequency method
C:-variable voltage -variable frequency method
D:-Fixed voltage -fixed frequency method
Correct Answer:- Option-C
Question60:-The purpose of the synchronizing control in a CRO is to
A:-Focus the spot on screen
B:-Adjust the amplitude of the display
C:-Control the intensity of spot
D:-Lock the display of the signal
Correct Answer:- Option-D
Question61:-Which is the necessary condition for generating sinusoidal voltage in a feedback type oscillator
A:-Total loop gain should be one
B:-Total phase shift should be 360° or 0°
C:-Either A or B
D:-Both A and B
Correct Answer:- Option-D
Question62:-The largest number that can be represented by ‘n’ bits is
A:-`2^(n)` – 1
B:-`2^(n)`
C:-`2^(n-1)`
D:-`2^(n+1)`
Correct Answer:- Option-A
Question63:-The binary equivalent of the Hexadecimal number `(18)_(16) is`
A:-00010010b
B:-00010011b
C:-10000010b
D:-00011000b
Correct Answer:- Option-D
Question64:-The output of a logic gate is “1” when all its inputs are at logic “0”, the gate is
A:-A NOR or an EX-OR gate
B:-A NAND or OR gate
C:-An AND or an EX-NOR gate
D:-None of above
Correct Answer:- Option-D
Question65:-If a mod 9 counter is constructed using 4 flip flops the counter will skip
A:-7 Counts
B:-8 Counts
C:-9 Counts
D:-none of the above
Correct Answer:- Option-A
Question66:-The two input OR gate is
A:-7400
B:-7483
C:-7432
D:-7423
Correct Answer:- Option-C
Question67:-Which of the following statement about RAM is not correct
A:-It stands for Random Access Memory
B:-It is R/W memory
C:-It is volatile memory
D:-The data’s are entered or stored in the chip during manufacturing
Correct Answer:- Option-D
Question68:-The PIV of diode in a half wave rectifier circuit with shunt capacitor filter is
A:-2Vm
B:-Vm
C:-Vm/2
D:-3Vm
Correct Answer:- Option-A
Question69:-The number of comparators required in a 3 bit comparator type ADC is
A:-6
B:-7
C:-3
D:-8
Correct Answer:- Option-B
Question70:-The rotor of a stepper motor has no
A:-Windings
B:-Commutator
C:-Brushes
D:-All of these
Correct Answer:- Option-D
Question71:-Which method of speed control cannot be used in a permanent magnet dc motor
A:-Armature voltage variation
B:-Armature resistance control
C:-Varying the field current
D:-All of the above
Correct Answer:- Option-C
Question72:-Which test on a transformer provides information about regulation, efficiency and heading under load
conditions.
A:-open circuit test
B:-short circuit test
C:-Hopkinsons test
D:-back to back test
Correct Answer:- Option-D
Question73:-In a transformer the resistance between primary and secondary must be
A:-zero
B:-1 kΩ
C:-100 kΩ
D:-infinite
Correct Answer:- Option-D
Question74:-V curves for a synchronous motor represent relation between
A:-field current and speed
B:-field current and power factor
C:-Armature current & field current
D:-Power factor and speed
Correct Answer:- Option-C
Question75:-An induction motor is expected to take largest starting current under which method of starting
A:-Direct online starting
B:-Starter-rotor starting
C:-star-delta starting
D:-Auto-transformer starting
Correct Answer:- Option-A
Question76:-The starting capacitor of a single phase motor is
A:-Electrolytic capacitor
B:-Ceramic capacitor
C:-Paper capacitor
D:-none of these
Correct Answer:- Option-A
Question77:-An elevator drive is required to operate in
A:-One quadrant only
B:-Two quadrant only
C:-Three quadrants only
D:-Four quadrants only
Correct Answer:- Option-D
Question78:-An ideal insulating material should have low
A:-insulation reistance
B:-dielectric strength
C:-dielectric loss angle
D:-mechanical strength
Correct Answer:- Option-C
Question79:-Two wire A and B of the same material and length l and 2l have radius r and 2r respectively, the ratio of their
specific resistance will be
A:-1:1
B:-1:2
C:-1:4
D:-1:8
Correct Answer:- Option-A
Question80:-Across the surface of a charged conductor, the electric
A:-the field is continous
B:-potential is discontinuous
C:-field is discontinuous
D:-none of the above
Correct Answer:- Option-C
Question81:-In magnetic circuits, an air gap is usually inserted so as to
A:-increase in mmf
B:-prevent saturation
C:-increase in flux
D:-the increase in inductance
Correct Answer:- Option-B
Question82:-An Electromagnetic field is radiated from a
A:-stationary point charge
B:-a capacitor with the DC voltage
C:-a conductor carrying in a DC current
D:-an oscillating dipole
Correct Answer:- Option-D
Question83:-In a series RLC circuit, the maximum voltage across the capacitor occurs at a frequency
A:-double the resonant frequency
B:-below the resonant frequency
C:-1.414 times the resonant frequency
D:-equal to resonant frequency
Correct Answer:- Option-B
Question84:-Wave winding is employed in a DC Machine of
A:-high current and low voltage rating
B:-low current and high voltage rating
C:-high current and high voltage rating
D:-low current and voltage rating
Correct Answer:- Option-B
Question85:-The flux in transformer core
A:-increases with load
B:-decreases with load
C:-remains constant irrespective of Load
D:-none of the above
Correct Answer:- Option-C
Question86:-In cylindrical Rotor ………… portion of the rotor is wound
A:-one third
B:-two third
C:-one half
D:-whole
Correct Answer:- Option-B
Question87:-Protection by fuses is generally not used beyond
A:-200 A
B:-50 A
C:-25 A
D:-10 A
Correct Answer:- Option-A
Question88:-Aluminium conductor cables can be joined by
A:-gas welding
B:-soldering
C:-compression
D:-thermite welding
Correct Answer:- Option-C
Question89:-Minimum distance of underground cable from the foundation of the building should be
A:-100 cm
B:-50 cm
C:-10 cm
D:-5 cm
Correct Answer:- Option-C
Question90:-Resolution of an instrument is
A:-the minimum quantity it can measure
B:-the maximum quantity that can measure
C:-the maximum non linearity
D:-ability to distinguish polarity
Correct Answer:- Option-A
Question91:-The response of a galvanometer is independent of its
A:-controlling torque
B:-number of turns
C:-circuit resistance
D:-none of these
Correct Answer:- Option-C
Question92:-A dynamometer type wattmeter response to the
A:-average value of active power
B:-average value of reactive power
C:-peak value of active power
D:-peak value of reactive power
Correct Answer:- Option-A
Question93:-Permission for addition/alteration in the lift installation is granted in
A:-Form F
B:-Form B
C:-Form D
D:-Form H
Correct Answer:- Option-B
Question94:-The licence for existing lift/escalator is issued in?
A:-Form F
B:-Form B
C:-Form D
D:-Form H
Correct Answer:- Option-A
Question95:-Motor used for elevators is generally
A:-synchronous motor
B:-induction motor
C:-capacitor start single phase motor
D:-any of the above
Correct Answer:- Option-B
Question96:-A synchronous motor is found to be more economical when the load is above
A:-1 kW
B:-10 kW
C:-20 kW
D:-100 kW
Correct Answer:- Option-D
Question97:-According to Indian Electricity rules, extra high voltage implies voltage exceeding.
A:-440 V
B:-650 V
C:-33 kV
D:-110kV
Correct Answer:- Option-C
Question98:-The first type of variable speed drive ever used on lifts was the so-called
A:-Two speed system
B:-Ward-Leonard system
C:-DC SCR
D:-VVVF
Correct Answer:- Option-B
Question99:-What type of elevator is used for low rise buildings where speed is not the main consideration?
A:-Gear-less traction elevator
B:-Geared elevator
C:-Hydraulic
D:-Deck elevator
Correct Answer:- Option-C
Question100:-Which motors are invariably used in lift systems to achieve good starting torques and enable good speed
control using variable voltage systems
A:-synchronous motor
B:-Double cage rotor induction motors
C:-dc series motor
D:-dc compound motor
Correct Answer:- Option-B