Material properties and Metal Forming (Machining) Processes - Set 03

Practice Test: Question Set - 03


1. Which type of motor is not used in axis or spindle drives of CNC machine tools?
    (A) Induction motor
    (B) DC servo motor
    (C) Stepper motor 
    (D) Linear servo motor

2. The main purpose of spheroidising treatment is to improve
    (A) Hardenability of low carbon steels
    (B) Machinability of low carbon steels
    (C) Hardenability of high carbon steels
    (D) Machinability of high carbon steels

3. NC contouring is an example of
    (A) Continuous path positioning
    (B) Point-to-point positioning
    (C) Absolute positioning
    (D) Incremental positioning

4. A ring gauge is used to measure
    (A) Outside diameter but not roundness
    (B) Roundness but not outside diameter
    (C) Both outside diameter and roundness
    (D) Only external threads

5. When the temperature of a solid metal increases,
    (A) Strength of the metal decreases but ductility increases
    (B) Both strength and ductility of the metal decreases
    (C) Both strength and ductility of the metal increases
    (D) Strength of the metal increases but ductility decreases

6. The strength of a brazed joint
    (A) Decreases with increase in gap between the two joining surfaces
    (B) Increases with increase in gap between the two joining surfaces
    (C) Decreases up to certain gap between the two joining surfaces beyond which it increases
    (D) Increases up to certain gap between the two joining surfaces beyond which it decreases

7. In order to have interference fit, it is essential that the lower limit of the shaft should be
    (A) Greater than the upper limit of the hole
    (B) Lesser than the upper limit of the hole
    (C) Greater than the lower limit of the hole
    (D) Lesser than the lower limit of the hole

8. When 3-2-1 principle is used to support and locate a three dimensional work-piece during machining, the number of degrees of freedom that are restricted is
    (A) 7
    (B) 8
    (C) 9
    (D) 10

9. Which among the NC operations given below are continuous path operations?
Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)
    (A) AW, LC and M
    (B) AW, D, LC and M
    (C) D, LC, P and SW
    (D) D, LC, and SW

10. In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.010⁺⁰∙⁰²⁰ mm. The maximum possible clearance in the assembly will be
    (A) 10 microns
    (B) 20 microns
    (C) 30 microns
    (D) 60 microns

11. During the execution of a CNC part program block
      NO20 GO2 X45.0 Y25.0 R5.0 ; the type of tool motion will be
    (A) Circular Interpolation − clockwise
    (B) Circular Interpolation − counter clockwise
    (C) Linear Interpolation
    (D) Rapid feed

12. The mechanism of material removal in EDM process is
    (A) Melting and Evaporation
    (B) Melting and Corrosion
    (C) Erosion and Cavitations
    (D) Cavitations and Evaporation

13. The percentage of carbon in gray cast iron is in the range of
    (A) 0.25 to 0.75 percent 
    (B) 1.25 to 1.75 percent
    (C) 3 to 4 percent
    (D) 8 to 10 percent

14. Cold working of steel is defined as working
    (A) At its recrystallisation temperature
    (B) Above its recrystallisation temperature
    (C) Below its recrystallisation temperature
    (D) At two thirds of the melting temperature of the metal

15. Quality screw threads are produced by
    (A) Thread milling
    (B) Thread chasing
    (C) Thread cutting with single point tool
    (D) Thread casting

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