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Theory of Machine

Theory of Machine
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)

cosβ
secβ
sinβ
cosecβ

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Theory of Machine
The minimum periodic time of a compound pendulum is

(1/2π). √(2kG/g)
(1/2π). √(kG/g)
2π. √(kG/g)
2π. √(2kG/g)

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Theory of Machine
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

Highs peed
Moderate speed
Slow speed
Any one of these

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Theory of Machine
In a flat collar pivot bearing, the moment due to friction is proportional to

(r₁³ - r₂³)/(r₁ - r₂)
(r₁³ - r₂³)/(r₁² - r₂²)
(r₁² - r₂²)/(r₁ - r₂)
(r₁² - r₂²)/(r₁ + r₂)

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Theory of Machine
The ratio of maximum fluctuation of speed to the mean speed is called

Maximum fluctuation of speed
None of these
Fluctuation of speed
Coefficient of fluctuation of speed

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Theory of Machine
The brake commonly used in railway trains is

Band and block brake
Band brake
Internal expanding brake
Shoe brake

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