Question84:-The disadvantage of open loop control system is
A:-There is a provision for feedback signal to be compared with the input signal

B:-They do not have provision for feedback signal to be compared with the
input signal

C:-Not suitable for profile turning
D:-Not suitable for straight cutting
Correct Answer:- Option-B
Question85:-Which one of the statements is true with the tool life of CNC machines?
A:-The equation for tool life is vrs = C

B:-The equation for tool life is L = 2%
C:-The equation for tool life is L =
D:-The equation for tool life is vr" = c
Correct Answer:- Option-A

Question86:-A-16-P-5-V-BE denotes the specification of a grinding wheel. The
number 16 belongs to

A:-Medium to hard grade of bond
B:-Structure of the wheel
C:-Find grain size
D:-Coarse grain size
Correct Answer:- Option-D
Question87:-Which statement is not correct with the use of ball screw in CNC lathe?
A:-No stick-slip
B:-Higher transmission efficiency
C:-High coefficient of friction
D:-Higher mechanical efficiency
Correct Answer:- Option-C
Question88:-Which one of the following statement is true with the VMC?
A:-The 'X' axis movement is transverse
B:-The 'X' axis movement is left and right
C:-The 'X' axis movement is up
D:-The 'X' axis movement is down
Correct Answer:- Option-B
Question89:-The cause of the defect glazing is due to the
A:-Grinding soft materials on a hard grade bonded wheel
B:-Vibration of the work

C:-Grinding hard materials on a hard grade bonded wheel