MACHINIST 3rd SEM MCQ QUESTION ANSWER - 10
MACHINIST 3rd SEM ALL QUESTION ANSWER
141 What is the name of machine system?
A Convention
B Auto tool changers
C Numerical control
D Computer numerical control
Correct Answer:- B Auto tool changers
142 What is the first step to stop CNC machine of an accident happen while working?
A Switch off regulator
B Press emergency switch
C Reset machine
D Reset regulator
Correct Answer:- B Press emergency switch
143 Which motor control the axes of CNC machine?
A Air motor
B DC series motor
C Servo motor
D Hydraulic motor
Correct Answer:- C Servo motor
144 Which mechanism reduces the back lash of CNC lathe?
A Stopper
B Clutch
C Recirculating ball screw with nut
D Break
Correct Answer:- C Recirculating ball screw with nut
145 What is G04?
A Linear interpolation
B CW circular interpolation
C CCW Circular Interpolation
D Dwell time
Correct Answer:- D Dwell time
146 Which type of chuck is used in a CNC lathe?
A Two jaw chuck
B Three jaw chuck
C Hydraulic chuck
D Four Jaw chuck
Correct Answer:- C Hydraulic chuck
147 What is the maximum machining length in a CNC lathe?
A 320 mm B 245 mm C 200 mm D 340 mm
Correct Answer:- B 245 mm
148 What is the spindle speed range in CNC machine?
A 40-500 RAM
B 40-4000 RAM
C 10-600 RAM
D 30-1000 RAM
Correct Answer:- B 40-4000 RAM
149 What is the name part marked as ‘X’ in block diagram of CNC machine tool?
B Y- axis position transducer
C X- axis servomotor
D Y- axis servomotor
Correct Answer:- D Y- axis servomotor
150 What types of taper is in the CNC machine spindle?
A ISO 40
B Morse taper
C Jarno taper
D Pin taper
Correct Answer:- A ISO 40
151 What R denotes as per ISO designation of boring bar S32USKKR12 of CNC lathe?
A Shank type
B Clearence angle
C Tool length
D Cutting direction
Correct Answer:- D Cutting direction
152 Which describing machine tool movement in CNC?
A G-code
B M-code
C T-word
D S-word
Correct Answer:- A G-code
153 What ‘N’ of ISO insert tool specifies?
A Shape
B Grade
C Material
D Relief angle
Correct Answer:- D Relief angle
154 What is M8 represent in programs off CPU tapping?
A Coolant off
B Coolant on
C Specific direction
D Tapping RH threads
Correct Answer:- B Coolant on
155 Which code represents in more flexible and suitable for threading longitudinal transverse and tapered thread?
A G 76 B G 92 C G 32 D G 34
Correct Answer:- G 34
156 Which preparatory code should be selected for taper threading cycle?
A G 32 B G 92 C G 76 D G 33
Correct Answer:- C G 76
157 Which G-code is used for tapping left hand thread with thread M4 in CNC program?
A G 74 B G 84 C G 28 D G 9
Correct Answer:- B G 84
158 What is the composition of stellite tool material?
A Cobalt, Chromium and Tungsten
B Cobalt, Nikel and Tungsten
C Cobalt, Chromium and Nikel
D Cobalt, Carbon and Tungsten
Correct Answer:- A Cobalt, Chromium and Tungsten
159 Which is the tool selection word is specified?
A G-Allowed by 5 digit numbers
B F-Allowed by 5 digit numbers
C S-Allowed by 5 digit numbers
D T-Allowed by 5 digit numbers
Correct Answer:- D T-Allowed by 5 digit numbers
160 What is the expansion of CAD?
A Computer Aided Development
B Computer Aided Design
C Computer Automatic Development
D Computer Automatic Design
Correct Answer:- B Computer Aided Design
161 Which is the disadvantage of NC system?
A Accuracy cannot be a change
B Increase compound rejection
C Skilled operator involves
D If tape is spoiled, entire program is affected
Correct Answer:- D If tape is spoiled, entire program is affected
162 Which guide way separate the surface contact between the sliding parts by a thin layer of fluid?
A Flat guide way
B Vee guide way
C Hydrostatic guide way
D Dovetail guide way
Correct Answer:- C Hydrostatic guide way
163 When the machine moves 25.49 mm for the commond X = 25.50 mm, what must be the positional accuracy?
A 0.001 mm B 0.01 mm C 0.1 mm D 1 mm
Correct Answer:- B 0.01 mm
164 What should be the safety precaution for holding the work piece to the lathe chuck?
A Cleaned
B Measured
C Clamped securly
D Polished
Correct Answer:- C Clamped securly
165 Which part provides linear travel to the tool in CNC lathe?
A Lead screw
B Ball screw
C Warm wheel
D Rack and Pinion
Correct Answer:- B Ball screw
166 Which axis the fore finger indicates in right hand thumb rule?
A Y axis B X axis C Z Axis D A axis
Correct Answer:- B X axis
167 What is the control system of the CNC machine?
B 2-D Contouring control
C 3-D Contouring control
D 2½ D Contouring control
Correct Answer:- B 2-D Contouring control
168 Which quadrant in cartesian co-ordinate will have positive value both in X and Y?
A Fourth
B Second
C Third
D First
Correct Answer:- D First
169 Which G-code description maximum spindle speed setting?
A G50 B G71 C G72 D G42
Correct Answer:- A G50
170 What is the function of M02 code in part programming?
A Programme stop
B Optional stop
C End of programme execution
D Coolant ON
Correct Answer:- C End of programme execution
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