1
GATE PI 2017
+1
-0.3
In gas tungsten arc welding process, the material coated on pure tungsten electrode to enhance its current carrying capacity is
A
Titanium
B
Manganese
C
D
Thorium
2
GATE PI 2017
+2
-0.6
A solid circular shaft is subjected to a bending moment $$M$$ and torque $$T$$ simultaneously. Neglecting the effects of stress concentration, the equivalent bending moment is expressed as
A
$${1 \over 2}\left( {M + \sqrt {{M^2} + {T^2}} } \right)$$
B
$$\left( {{M \over 2} + \sqrt {{M^2} + {T^2}} } \right)$$
C
$${1 \over 2}\left( {M + \sqrt {{M^2} + 4{T^2}} } \right)$$
D
$$\left( {{M \over 2} + \sqrt {{M^2} + 4{T^2}} } \right)$$
3
GATE PI 2017
+2
-0.6
A pair of spur gears with $${20^ \circ }$$ full-depth involute teeth is used to transmit $$3.5$$ $$kW$$ of power. The pinion rotates at $$700$$ $$rpm$$ and has pitch circle diameter of $$100$$ $$mm.$$ Assuming a single pair of teeth in contact, the total force acting on a gear tooth (in $$kN$$) is
A
$$0.347$$
B
$$0.954$$
C
$$1.016$$
D
$$1.302$$
4
GATE PI 2017
Numerical
+2
-0
In a machining operation with turning tool, the tool life $$(T)$$ is related to cutting speed $$v$$ $$(m/s),$$ feed $$f(mm)$$ and depth of cut $$d(mm)$$ as $$T = C\,v{\,^{ - 2.5}}\,{f^{ - 0.9}}\,{d^{ - 0.15}}$$\$
where, $$C$$ is a constant. The suggested values for the cutting parameters are: $$V=1.5$$ $$m/s,$$ $$f=0.25$$ $$mm$$ and $$d=3$$ $$mm$$ for normal rough turning. If the operation is performed at twice the cutting speed and the other parameters remain unchanged, the corresponding percentage change in tool life is ______________.
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