Indian Railways

INDIAN RAILWAYS INSTITUTE OF MECHANICAL AND ELECTRICAL ENGINEERING JAMALPUR – 811214 QUESTION PAPER ON SECOND SHOP SESSION – SCA 1999 BATCH Date: 05/07/03 Max. Marks: 100 Time allowed: 2½ Hrs Note: (i) Question No.1 is Compulsory (ii) Answer any Five Questions in addition to Question No.1. Marks allocated are indicated against each Question. (iii) Question Paper is to be returned with Answer Sheet. 1. Fill in the Blanks: (20) (a) Surface finish of Wheel seat on Diesel Loco Wheel is _______________. (b) Tyred Wheel is provided on Wheel set of ___________ Stock in JMP Workshop. (c) Maximum permissible diameter of BOXN Wheel set is _______ mm. (d) Maximum permissible Incentive Earning in CLW Type Incentive Scheme is ________ %. (e) _______ denotes Idle Card at JMP Workshop. (f) Buffer height of BOXN Wagon in empty condition is ________ mm. (g) Periodicity for POH of BOXN Wagon is ________. (h) WDM2 Wheel Disc is pressed on Axle at _______ Tonne. (i) Cutting speed for machining Workpiece of Diameter 40mm at 60 RPM is ________ m/min. (j) Broach is used for ___________ operation. (k) _________________ Apparatus is used for Estimation of Carbon % in Steel / Cast Iron. (l) With increase in Rake angle, Cutting force and Power requirement _________. (m) _________ Apparatus is used for estimation of Carbon percentage in Steel/Cast Iron. (n) Size of a Centre Lathe is determined by __________ and ______________. (o) ___________ accessory is used on Indexing Head of Milling Machine to eliminate repeated hole counting. (p) _________ type of Chuck can be used on a Centre Lathe to hold a Workpiece off-centre. (q) SAE 4140 Steel denotes ________ % Carbon. (r) ________ is used to hold Workpiece on a Surface Grinder.

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(s) _________ type Brake Beam is fitted on CASNUB 22NL Bogie. (t) _______ operation is undertaken to remove sharp edges of a Hole. 2. (a) Describe constructional details of CASNUB Bogie with sketch. What modifications have been carried out on CASNUB Bogie ? (b) Describe the process for overhauling CTRB used in BOXN Wagon. Precautions required to be taken may also be indicated. (c) Explain the process of Ultrasonic Testing of Axles. 3. (a) Describe the sequence of operation for Diesel Wheel set machining. Indicate important dimensions to be maintained. (b) How is Axle journal burnishing undertaken? Describe Wheel set pressing operation.

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4. (a) Describe the construction and working of Vertical Milling Machine. (6) (b)What are different types of Milling Cutters used in JMP Workshop? (6) Differentiate between ‘Up Milling’ and ‘Down Milling’. (c) Explain the process of Gear cutting on ‘Sprocket’ of Jamalpur Jack on (4) Milling Machine. 5. Write Short Notes on any four of the following : (a) Difference between Jig and Fixture. (b) Chip breaker (c) Difference between Shaper and Planer Machine. (d) Collet Chuck (e) Difference between Capstan and Turret Lathe

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6. (a) Describe the construction and working of Centre Lathe. How is Thread cutting undertaken on Centre Lathe ? (b) What is the difference between Live Centre in the Headstock and Live Centre in the Tailstock ? (c) Describe various operations for machining Gear Box of Jamalpur Jack in Machine Shop.

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(a) Describe the process for testing Rubber components in CMT Laboratory. How is Kinematic Viscosity of Lube Oil tested ? (b) Give details of various Allowances provided in CLW Type Incentive Scheme.

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