1
GATE ME 2007
+1
-0.3
For an under damped harmonic oscillator, resonance
A
occurs when excitation frequency is greater than undamped natural frequency.
B
occurs when excitation frequency is less than undamped natural frequency
C
occurs when excitation frequency is equal to undamped natural frequency
D
never occurs
2
GATE ME 2006
+1
-0.3
The differential equation governing the vibrating system is
A
$$m\mathop x\limits^{ \bullet \bullet } + c\mathop x\limits^{ \bullet \bullet } + k\left( {x - y} \right) = 0$$
B
$$m\left( {\mathop x\limits^{ \bullet \bullet } - \mathop y\limits^{ \bullet \bullet } } \right) + c\left( {\mathop x\limits^ \bullet - \mathop y\limits^ \bullet } \right) + kx = 0$$
C
$$m\mathop x\limits^{ \bullet \bullet } + c\left( {\mathop x\limits^ \bullet - \mathop y\limits^ \bullet } \right) + kx = 0$$
D
$$m\left( {\mathop x\limits^{ \bullet \bullet } - \mathop y\limits^{ \bullet \bullet } } \right) + c\left( {\mathop x\limits^ \bullet - \mathop y\limits^ \bullet } \right) + k\left( {x - y} \right) = 0$$
3
GATE ME 2005
+1
-0.3
There are four samples P, Q, R and S, with natural frequencies 64, 96, 128 and 256 Hz, respectively. There are mounted on test setups for conducting vibration experiments. If a loud pure not of frequency 144Hz is produced by some instrument, which of the samples will show the most perceptible induced vibration?
A
P
B
Q
C
R
D
S
4
GATE ME 2004
+1
-0.3
A vibrating machine is isolated from the floor using springs. If the ratio of excitation frequency of vibration of machine to the natural frequency of the isolation system is equal to 0.5, the transmissibility ratio of isolation is
A
$${1 \over 2}$$
B
$${3 \over 4}$$
C
$${4 \over 3}$$
D
$$2$$
GATE ME Subjects
EXAM MAP
Medical
NEET