1.Interpolator in a CNC machine
a)Controls spindle speed
b) coordinate axis movement
c)operates tool changer
d)Commands conned cycle
Answer:(b)
Inter polar provides intermediate coordinate position along the programed path .
2.For an Oldham coupling used between 2 shaft which among the following Statement are correct:
1) Torsional load is transferred along the shaft
2)A velocity ratio of 1:2 is between the shaft is obtained without using gear
3) Bending load is transferred transverse to shaft axis
4) Rotational is transferred along shaft axis
a)1&3
b)1&4
c)2&3
d)2&4
Answer:(b)
A Velocity ratio of 1:2 between shaft is obtained using gears.
3.The time series forecasting method using equal weightage to each of the most recent observation is
a)moving average method
b) exponential smoothing with linear trend
c)triple exponential smoothing
d)Kalman filter
Answer:(a)
Moving average method gives equal weightage to all data point.
4.The number of atom per unit cell and number of slip system respectively for a face centred cubic(FCC) crystal are
a)3,3
b)3,12
c)4,12
d)4,48
Answer:(c)
For Face Centred Cubic (FCC) crystal are;
Number of atom per unit cell=4
Number of slip system =12
5.The equation of motion for spring mass system exited by a harmonic force is Mx+Kx=Fcos(wt) where M is mass ,K is spring stiffness,F is the force amplitude,w is the angular frequency of excitation resonance occur when w is equal to
6.A bar of uniform cross-section and weighing 100N is held using two mass less and inextensible string S1 and s2 as shown in the figure
a)T1=100N&T2=0N
b)T1=0N&T2=100N
c)T1=75N&T2=25N
d)T1=25N&T2=75N
7.Which one of the following Statement is incorrect for a superheated vapour
a)It’s pressure is less than the saturation pressure at given temperature.
b)It’s temperature is less than saturation temperature at a given pressure.
c)It’s volume is less than volume of saturated vapour at a given temperature.
Answer:(a)
At given temperature T1 saturated pressure is greater than the given pressure.
8.In a linearly hardening plastic material,true stress beyond the limited yeilding.
a) Increase linear with true strain.
b) First increase linearly then decrease linearly.
c)Decreasing linear with true strain.
d) Remain constant
Answer:(a)
The true stress beyond the initial yeilding increase linearly with the true strain.
9.The type of weld represented by the shaded region in the figure is
a) Groove
b)Spot
c)Fillet
d)Plug
Answer:(c)
The given shaded region in the figure
will be fillet weld on T- joint.
10.A grinding ratio of 200 impulse that the
a) Grinding wheel wears 200 times the volume of the material removed.
b)A grinding wheel wears 0.005 times the volume of the material removed.
c)Aspect ratio of abrasive particles used in the grinding wheel is 200.
d)Ratio volume of abrasive particles to that of grinding wheel is 200.
Answer:(b)
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