1
GATE ME 2015 Set 3
MCQ (Single Correct Answer)
+1
-0.3
A gear train is made up of five spur gears as shown in the figure. Gear $$2$$ is driver and gear $$6$$ is driven member. $${N_{2,}}{N_{3,}}{N_{4,}}{N_5}$$ and $${N_6}$$ represent number of teeth on gears $$2,3,4,5,$$ and $$6$$ respectively, The gear(s) which act(s) as idler(s) is/are GATE ME 2015 Set 3 Theory of Machines - Gears and Gear Trains Question 24 English
A
Only $$3$$
B
Only $$4$$
C
Only $$5$$
D
Only $$3$$ and $$5$$
2
GATE ME 2015 Set 3
Numerical
+2
-0
The torque (in N-m) exerted on the crank shaft of a two stroke engine can be described as is the crank angle as $$\,\,T = 10000 + 1000\sin 2\theta - 1200\,\cos 2\theta ,\,\,$$ where $$\,\theta \,\,$$ is the crank angle as measured from inner dead center position. Assuming the resisting torque to be constant, the power (in $$kW$$) developed by the engine at $$100$$ rpm is ________.
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3
GATE ME 2015 Set 3
MCQ (Single Correct Answer)
+1
-0.3
Which of the following statements are TRUE for damped vibrations?

$$P.$$ For a system having critical damping, the value of damping ratio is unity and system does not undergo a vibratory motion.
$$Q.$$ Logarithmic decrement method is used to determine the amount of damping in a physical system.
$$R.$$ In case of damping due to dry friction between moving surfaces resisting force of constant magnitude acts opposite to the relative motion.
$$S.$$ For the case of viscous damping, drag force is directly proportional to the square of relative velocity.

A
$$P$$ and $$Q$$ only
B
$$P$$ and $$S$$ only
C
$$P,Q$$ and $$R$$ only
D
$$Q$$ and $$S$$ only
4
GATE ME 2015 Set 3
MCQ (Single Correct Answer)
+2
-0.6
Figure shows a single degree of freedom system. The system consists of a mass less rigid bar $$OP$$ hinged at $$O$$ and a mass $$m$$ at end $$P.$$ The natural frequency of vibration of the system is GATE ME 2015 Set 3 Theory of Machines - Vibrations Question 18 English
A
$${f_n} = {1 \over {2\pi }}\sqrt {{k \over {4m}}} $$
B
$${f_n} = {1 \over {2\pi }}\sqrt {{k \over {2m}}} $$
C
$${f_n} = {1 \over {2\pi }}\sqrt {{k \over {m}}} $$
D
$${f_n} = {1 \over {2\pi }}\sqrt {{{2k} \over m}} $$
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