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When the belt is transmitting maximum power, the belt speed should be<br>(Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))
A
$$\sqrt {\frac{{{\text{P}}\max }}{{2{\text{m}}}}} $$
B
$$\sqrt {\frac{{{\text{P}}\max }}{{3{\text{m}}}}} $$
C
$$\sqrt {\frac{{{\text{P}}\max }}{{\text{m}}}} $$
D
$$\sqrt {\frac{{{\text{3m}}}}{{{\text{P}}\max }}} $$
Correct Answer:
$$\sqrt {\frac{{{\text{P}}\max }}{{3{\text{m}}}}} $$
From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.
A
P, Q
B
Q, R
C
Q, S
D
R, S
The layout of a shaft supported on bearings at A & B is shown. Power is supplied by means of a vertical belt on pulley B which is then transmitted to pulley C carrying a horizontal belt. The angle of wrap is 180’ and coefficient of friction is 0.3. Maximum permissible tension in the rope is 3kN. The radius of pulley at B & C is 300mm and 150mm. Calculate the tension in the rope of pulley C.
A
6778.3N and 7765.3N
B
5948.15N and 2288.75N
C
5468.4N ad 8678.3N
D
None of the listed
What is the monoisotopic and average mass of valine? Given data: Mass of the most abundant isotope of Carbon (C°)=12.0000, Mass of most abundant isotope of Hydrogen (H°)=1.0078, Mass of most abundant isotope of Oxygen (O°)=15.9949, Mass of most abundant isotope of Nitrogen (N°)=14.0031, The average mass of Carbon (C)=12.011, The average mass of Hydrogen (H)=1.008, The average mass of Oxygen (O)=15.999, The average mass of Nitrogen (N)=14.007.
A
99.068 and 99.2361
B
99.216 and 99.326
C
99.111 and 99.321
D
99.068 and 99.132
The ratio of belt tensions $$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}$$ considering centrifugal force in flat belt is given by where,
m = mass of belt per meter (kg/m)
v = belt velocity (m/s)
f = coefficient of friction
$$\alpha $$ = angle of wrap (radians)
A
$$\frac{{{{\text{p}}_1} - {\text{m}}{{\text{v}}^2}}}{{{{\text{p}}_2} - {\text{m}}{{\text{v}}^2}}} = {{\text{e}}^{{\text{f}}\alpha }}$$
B
$$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}} = {{\text{e}}^{{\text{f}}\alpha }}$$
C
$$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}} = {{\text{e}}^{ - {\text{f}}\alpha }}$$
D
$$\frac{{{{\text{p}}_1} - {\text{m}}{{\text{v}}^2}}}{{{{\text{p}}_2} - {\text{m}}{{\text{v}}^2}}} = {{\text{e}}^{ - {\text{f}}\alpha }}$$
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to
(Where, $${{\text{P}}_{\text{c}}}$$ = tension in belt due to centrifugal force)
A
$$3{{\text{P}}_{\text{c}}}$$
B
$${{\text{P}}_{\text{c}}}$$
C
$$\frac{{{{\text{P}}_{\text{c}}}}}{3}$$
D
$$2{{\text{P}}_{\text{c}}}$$
The layout of a shaft supported on bearings at A & B is shown. Power is supplied by means of a vertical belt on pulley B which is then transmitted to pulley C carrying a horizontal belt. The angle of wrap is 180’ and coefficient of friction is 0.3. Maximum permissible tension in the rope is 3kN. The radius of pulley at B & C is 300mm and 150mm. If allowable shear stress in the shaft is 70N/mm² and torsional and bending moments are M=1185000N-mm and m=330000N-mm, find the diameter of the shaft.
A
36.8mm
B
39.7mm
C
44.7mm
D
40.3mm
A V-belt operates at 25 m/s peripheral speed. The mass of the belt per unit length is 0.9 kg/m. The value of centrifugal tension in belt is ______
A
592 N
B
562.5 N
C
973.6 N
D
946 N
The layout of a shaft supported on bearings at A & B is shown. Power is supplied by means of a vertical belt on pulley B which is then transmitted to pulley C carrying a horizontal belt. The angle of wrap is 180’ and coefficient of friction is 0.3. Maximum permissible tension in the rope is 3kN. The radius of pulley at B & C is 300mm and 150mm. If bending moment on point B in horizontal plate is M and in vertical plane is m, then the net bending moment at point B is?
A
M
B
m
C
M+m
D
√M²+m²
The power transmitted by a belt is maximum when the maximum tension in the belt is __________of centrifugal tension.
A
one-third
B
two-third
C
double
D
three times
The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.
A
One-third
B
Two-third
C
Double
D
Three times