1
GATE ME 2013
MCQ (Single Correct Answer)
+1
-0.3
If two nodes are observed at a frequency of $$1800$$ rpm during whirling of a simply supported long slender rotating shaft, the first critical speed of the shaft in rpm is
A
$$200$$
B
$$450$$
C
$$600$$
D
$$900$$
2
GATE ME 2010
MCQ (Single Correct Answer)
+1
-0.3
The natural frequency of a spring-mass system on earth is $${\omega _n}.$$ The natural frequency of this system on the moon (gmoon = gearth/6) is
A
$${\omega _n}$$
B
$$0.408$$$${\omega _n}$$
C
$$0.204$$$${\omega _n}$$
D
$$0.167$$$${\omega _n}.$$
3
GATE ME 2009
MCQ (Single Correct Answer)
+1
-0.3
The rotor shaft of a large electric motor supported between short bearings at both the ends shows a deflection of $$1.8$$ mm in the middle of the rotor. Assuming the rotor to be perfectly balanced and supported at knife edges at both the ends, the likely critical speed (in rpm) of the shaft is
A
$$350$$
B
$$705$$
C
$$2810$$
D
$$4430$$
4
GATE ME 2007
MCQ (Single Correct Answer)
+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
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