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Theory of Machine

Theory of Machine
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Hunt
Stable
Unstable
Isochronous

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Theory of Machine
Cross head and guides form a

Higher pair
Sliding pair
Lower pair
Turning pair

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Theory of Machine
A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become

tp /16
4 tp
16 tp
tp /4

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Theory of Machine
Relationship between the number of links (L) and number of pairs (P) is

P = 2L - 2
P = 2L + 2
P = 2L + 4
P = 2L - 4

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tan(φ - α)
T = W.r tan(φ + α)
T = W.r tanφ
T = W.r tanα

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Theory of Machine
The frequency of oscillation of a compound pendulum is

2π. √[(kG² + h²)/gh]
(1/2π). √[gh/(kG² + h²)]
2π. √[gh/(kG² + h²)]
(1/2π). √[(kG² + h²)/gh]

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