Central Institute of Plastics Engineering & Technology Head Office: Guindy, Chennai – 600 032 Academic Cell Question Bank Course : PGD PPT Subject : Machine Maintenance

Semester: II UNIT- I

1 Maintenance consist of the following action (s) (a) Replace of component (b) Repair of component (c) Service of component (d) All of the above Ans: (d) All of the above 2

Down time related to (a) Increase in sales

(b) Reduction in overheads (c) Loss of production

(d) none

Ans : (c) Loss of production 3

Belt of an Electric motor is broken, it needs (a) Break down maintenance (b) Preventive maintenance (c) Quarterly maintenance (d) None Ans: (a) Break down maintenance

4

Lubrication comes under (a) Break down maintenance (b) Preventive maintenance (c) Quarterly maintenance (d) None Ans:(b) Preventive maintenance

5

Equipment record register is meant for (a) The way machine behaves (b) preventive maintenance (c) Spares record

(d) None

Ans: (a) The way machine behaves 6

Total preventive maintenance results (a) cost increases

(b) less idle time

(c) Zero Break down (d) All of the above

(b) Dial gauge

(c) Scale

Ans: (c) Zero Break down

7

The instrument used for leveling (a) Bore gauge

(d) Sprit level

Ans : (d) Sprit level 8

Anti vibration pads absorb --------------l shocks due to machine dynamics (a) Mechanical

(b) Electrical

(c) Hydraulic

(d) None

Ans: (a) Mechanical

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9

Earthing of Equipment/Machine prevents (a) Electric shocks

(b) Leakage currents

(c) High voltage

(d)High currents

(c) copper

(d) Aluminum

Ans : (a) Electric shocks 10 Best conductor used for Earthing is ---------(a) Brass

(b) Silver

Ans : (c) Copper 11 Megger is used for measuring --------------- of cable (a) Current

(b) Voltage

(c) Insulation resistance (d) capacitance

Ans : (c) Insulation resistance 12 Annual maintenance calendar comes under ------------- maintenance (a) Break down

(b) Preventive

(c) Zero

(d) none

Ans : (b) Preventive 13 Voltage between Neutral and earth should be less than ---V for microprocessor based machine (a) 5V

(b) 10 V

(c) 1 V

(d) 20V

Ans : (c) 1V 14 Which type of Handling equipment is required for Unloading the Heavy machine from truck (a) Crane

(b) pellet truck

(c) Tripod

(d) Ladder

Ans: (a) Crane UNIT-II 15 In which of the following drives, there is no slip (a) Open belt drive

(b) Crossed belt drive

(c) Rope drive

(d) Chain drive

Ans : (d) Chain drive 16 Crowning of a pulley is done to (a) Prevent the slipping of a belt

(b) To increase the tension of a belt

(c) To increase the angle of contact

(d) None of the above

Ans : (a) To prevent slipping of belt 17 Other name of Ring plunger is (a) Non return valve

(b) Two way valve

(c) Piston valve

(d) None

(c) Heating

(d) None

Ans : (a) Non Return valve

18 Best method of screw hardening (a) Nitriding

(b) Case hardening

Ans (a) Nitriding

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19 Which type of Bearing is used in extruder for screw assembly? (a) Ball bearing

(b) Thrust bearing

(c) Bush

(d) Roller bearing

Ans: (b) Thrust bearing 20 The ---------------- in Extruder is one type of filter (a) Screen pack

(b) Breaker plate

(c) die

(d) none

Ans: (a) Screen pack 21 The Breaker plate used in extruder for -----------(a) To convert spiral flow to linear flow

(b)To convert linear flow to spiral flow

(c) To brake the flow

(d) none

Ans : (a) To convert spiral flow to linear flow 22 In Calendar roll, the rollers are electroplated to prevent -----------(a) Corrosion

(b) polish

(c) wear and tear

(d) none

Ans : (a) Corrosion 23 Gear box is used for reducing the -------------- of extruder screw (a) Flow

(b) speed

(c) Traction

(d) cost

Ans : (b) speed 24 V Belt drive is ---------------- drive (a) Negative

(b) positive

(c) Non positive

(d) None

Ans : (c) Non positive 25 The ------------- assembly is used for platen movements in all electric machines (a) Ball screw

(b) Thrust bearing (c) Chain drive

(d) Belt drive

Ans : (a) Ball screw

UNIT-III and IV

26 Which fluid is used in hydraulic power systems? (a) Water

(b) oil

(c) non-compressible fluid

(d) all of the above

Ans : (b) Oil

27 Pressure of 1 bar is equal to (a)14.5 psi

(b) 145 psi

(c) 12.5 psi

-6

(d) 145 x 10 psi

Ans : (a) 14.5 psi

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28 How is power transmitted in fluid power systems? (a) power is transmitted instantaneously

(b) power is transmitted gradually

(c) both a and b

(d) none of the above

Ans : (a) power is transmitted instantaneously

29 Pumps used in hydraulic applications are (a) positive displacement pumps (b) variable displacement pumps (c) fixed displacement pumps (d) all the above Ans : (d) all the above

30 Rotary motion in a hydraulic power unit is achieved by using (a) Hydraulic cylinder

(b) pneumatic cylinder

(c) both a and b

(d) none of these

Ans : (d) none of these

31 What is the function of electric actuator? (a) converts electrical energy into mechanical torque (b)converts mech. torque into electrical energy (c) converts mech. energy into mechanical torque

(d) none of these

Ans : (a) Converts electrical energy into mechanical torque 32 Piston pump is ----------------- pump (a) Positive Ans : (a) Positive

(b) Non positive

33 Servo valves are ---------------- loop control devices. (a)Open (b) Closed Ans : (b) closed

(c) Vane

(d) Centrifugal

(c) Time

(d) None of the above

34 The heat generated in hydraulic systems can be absorbed by (a)Lubrication (b) Cooling (c)Sealing

(d) All the above

Ans : (b) cooling

35 The temperature at which a fluid starts flows is called ------------ point (a) Pour (b) Flash (c) freezing

(d) Fire

Ans : (a) Pour

36 Which of the following is not used as a component in hydraulic Power Pack (a) pressure gauge (b)filter (c) valve

(d) reservoir

Ans : ( c ) Valve

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37 Which of the following is non positive pump (a) vane pump (b) centrifugal pump

(c) gear pump (d) piston pump ‘

Ans : (b) Centrifugal pump 38 What is the principle of operation used in gear pumps? (a) two gears rotate in same direction (b) two gears rotate in opposite direction (c) both and b (d) none of the above Ans : (b) two gears rotate in opposite direction 39

40

41

Radial piston pumps can have, (a) cylinder block rotating and cam stationary (c) both a and b Ans : (c ) both(a)and(b)

(b) cylinder block stationary and cam rotating (d) none of the above

Which type of motion is transmitted by hydraulic motor? (a) Linear motion (b) rotary motion (c)both a and b Ans : (b) Rotary motion

(d) none

What is the function of a flow control valve? (a) Flow control valve changes the direction of oil flow (b) Flow control valve can adjust the flow rate of hydraulic oil ( c) both a and b (d) none of the above Ans : (b) Flow control valve can adjust the flow rate of hydraulic oil

42

What does the numbers in 4/2 valve mean? (a) 4 positions and 2ways (b) 4ways and 2positions (c) both a and b (d) none of the above Ans : (a) 4 positions and 2 ways

43 Check valve is ------------------- valve (a) Directional valve (b) One way valve

(c) Two way valve

(d) Four way valve

(c) Direction

(d) None

The ---------- circuit is used to reduce the speed of actuator (a) Meter in (b) Meter out (c) Bleed off

(d) None

Ans : (b) One way valve 44

A pressure relief valve can be ---------- operated (a) Flow operated

(b) Pilot operated

Ans : (b) Pilot operated 45

Ans : (c ) Bleed off 46

The function of pressure switch is to --------------(a) To Activate Locking (b) to activate injection (c) For refill

(d) For ejection

Ans : (a )To Activate Locking

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47 The function of a flow control valve is to control (a) Speed (b) Pressure (c) Direction

(d) All of these

Ans : (a) Speed 48 A C solenoid is an ----------magnet (a) Electro (b) Permanent

(c) Para

(d) None

(c) 1000 kPa

(d) 100 psi

(c) Control

(d) all

Ans : (a) Electro 49 One bar is equal to 100Kpa (a) 500 kPa (b) 100 kPa Ans : (b)100 kPa 50 FRL unit is used in ---------- circuit (a) Pneumatic (b) Hydraulic Ans : (a) Pneumatic 51 Pressure switch works as --------- for compressor (a) Controller (b) Regulator (c) Lubricator

(d) none

Ans : (a) Controller 52 N O in circuits means (a) Normally open (b) Normally close

(c) Permanent close

(d) all

(c) LOW

(d) No frequency

(c) Flow

(d) direction

(c) 2

(d) 1

Ans : (a) Normally open 53 The frequency of D C supply is (a) 50HZ (b) 100HZ Ans : (d) No frequency 53 Relief valve controls ------------------(a) Speed (b) pressure Ans (c) Flow 54 Double Acting cylinder has -----ports (a) 3 (b) 4 Ans : (c) 2 55 An well designed Hydraulic tank should be separate from oil (a) Foreign materials (b) water ( c) Dust

(d) none

Ans : (a) Foreign materials 56 To control Bubbles in Hydraulic tank ---------------------------- is provided (a) Separator (b) baffle plate (c) water separator (d) none Ans : (b) Baffle plate 57 A Filter is used to stop entering------------- into the system (a) Water (b) dust (C) Gas

(d)none

Ans (b) dust

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58 Accumulator is ----------- device (a)Storage (b) Discharge

( c) Restriction

(d) Control

(c) N2

(d) H2

Ans (a) Storage 59 -------------- Gas is used in accumulator (a) Co2 (b) O2 Ans ( c ) N2

60 Pressure transducer converts ______ energy to ________energy. (a) Electrical to Pressure (b) mechanical to pressure (c) Flow to pressure (d) Pressure to electrical Ans (d) Pressure to electrical 61 Air blower is ------------ pump (a) Positive (b) Non positive

(c) piston

(d) All of these

(c) Continues

(d)none

Ans : (b) Non positive 62 Vane pump ---------- discharge pump (a) Volumetric (b) Pressure Ans : (a) Volumetric 63 An check valve can be linear or rotary (a) Linear (b) rotary

(c) bi directional

(d) all

Ans : (a) Linear 64 Pneumatics used ------------ as medium (a) Air (b) Water

(c) oil

(d) coolant

Ans : (a) Air 65 Locking tonnage is maintained by ------------(a) Intensifier (b) pressure valve (c) D C Valve

(d) Check valve

Ans : (a) Intensifier 66 Direction control valve controls direction of -------------------(a) Pressure (b) speed (c) Flow

(d) none

Ans : ( c ) Flow UNIT V 68 What does PLC stands for (a) Process logic controller (c) Programmable logic controller

(b) Programmable language converter (d) Programmable logic converter

Ans : (c) Programmable logic controller 69 Proportional valves are controls both speed and -------------. a) Pressure (b)flow (c) time

(d) None of the above

Ans : (a) Pressure

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70 For Starting of above10HP motors ------------starter is used (a) DOL (b) Star delta (c) Transformer type (d) All the above Ans : (b) Star delta 71 Which of the following automatically isolates an electrical circuit under short circuits? (a) MCCB (b) Thyristor (c) Fuse (d) Switch Ans: (a) MCCB 72 The device used to convert AC to DC is (a) Rectifier (b) Inverter

(c)Transistor

(d) UPS

Ans : (a) Rectifier 73 The device used to check the speed of motor is (a) Megger (b) Volt meter (c) Tachometer

(d) Isolator

Ans : (c ) Tachometer 74 Proximity sensors is ----------t type sensor (a) Photo (b) Contact

(c) mechanical

(d) none

Ans : (b) contact 75 Limit switch is ---------- operated device (a) Mechanical (b) Electro

(c) Electronic

(d) none

Ans : (a) Mechanical 76 The speed at which the rotating magnetic field produced by a stator (a) Rotor speed (b) Non synchronous speed (c) Synchronous speed (d) none Ans : (c) Synchronous speed 77 The starting torque in a single phase induction motor is a) High (b) low (c)zero

(d) very low

Ans : ( c ) Zero 78 O L R protects motor from (a) Over loads (b) low current

( c) low voltage

(d) Lightning

Ans : (a) Over loads 79 Inductive sensors cannot be used to detect (a) Metallic (b) Non Metallic (c) Inductive

materials. (d) capacitive

Ans: (b) Non metallic 80 To improve power factor ------------------ is connected in circuit (a) Inductor ( b) capacitor (c ) Resistor

(d) Magnet

Ans : (b) Capacitor

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81 The voltage and current are ---------- In resistive loads (a) In phase (b) out off phase Ans : (a) In phase

(c) lagging

82 Which of the following is the output of a thermocouple? (a) Alternating current (b) Direct current (c) A.C.voltage

(d) leading

(d) D.C.voltage

Ans (d) D C Voltage 83 Induction motor runs with (a) Lagging pf

(b) Leading pf

(c) Zero pf

(d) Unity pf

(b) relay

(c) contactor

(d) switch

(c) Double on line

(d) Direct on line

(c) PT-100

(d) Bk - 50

Ans : (a) Lagging pf 84 PID is a type of (a) Sensor Ans : (a) sensor 85 DOL starter is ____________ (a) Dual on line (b) Direct off line Ans : (d) Direct on line 86

Which of the following is not thermocouple (a) Fe-K (b) Cr-Al Ans : (d) Bk - 50

87 Which material can be used upto a temperature of 130° C? (a) Mica (b) Cotton (c) Synthetic resin

(d) All of these

Ans : (a) Mica 88 On what factors is the rated voltage selected for an induction motor? (a) Motor rating (b) Starting current (c) Fault levels of supply

(d) All of these

Ans : (d) All of these

89 Solenoid is an -------------load (a) Inductive

(b) capacitive

(c) Resistive

(d) none

(c) Heater

(d) Capacitor

Ans : (a) Inductive 90 Best example for resistive load (a) Motor (b) Tube light Ans: ( C) Heater 91 All Micro processor works on -----------------(a) Vector algebra (b) Boolean algebra (c) Arithmetic Ans : (b) Boolean algebra 92 Transistor the -------------- signal (a) decrease (b) amplify Ans : (a)True

Machine Maintenance

(c) Modify

(d) all

(d) none

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93 Diode is ------------- terminal device (a) 2 (b) 3

(c) 4

(d) 1

(c) Non conductive

(d) Conductive

Ans (a) 2 94 N C means --------------(a) Normally close (b) Normally open Ans : (a) Normally close 95 Ammeter is connected in ------------------------ in the circuit (a) Parallel (b) Series (c) Direct

(d) Star

Ans : (b) series 96 Best example for Semi conductor material is (a) Aluminium (b) wood

(c) Silica

(d) Iron

(c) Nichrome

(d) rubber

(c) VA

(d) W

(c) Asbestos

(d) none

(c) KVARH

(d) KW

Ans : ( c ) Silica 97 Material used for making heating element (a) Copper (b) Silver Ans : (c) Nichrome 98 Generators are rated in ----------(a) KVA (b) KW Ans : (a) KVA 99 Best insulation material used in Heaters (a) Ceramic (b) Mica Ans : (a) Ceramic 100 Unit of Electrical energy is (a) KWH (b) KVAH Ans : (a) KWH 101 Electrons are minority carriers in ----------- type semiconductors (a) N – Type (b) P-Type (c) PNP –Type (d) NPN-Type Ans : (b) P-Type 102 Transistor is ------------- terminal device (a) Three (b) Four

(c) one

(d) six

Ans : (a)Three

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