Exercise: Engineering Mechanics

Questions for: Engineering Mechanics

The periodic time (T) is given by(where ω = Angular velocity of particle in rad / s.)
A:
ω/2π
B:
2π/ω
C:
2π x ω
D:
π/ω
Answer: B
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The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)
A:
α = 45° + φ/2
B:
α = 45° - φ/2
C:
α = 90° + φ
D:
α = 90° - φ
Answer: B
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The rate of change of displacement of a body is called
A:
velocity
B:
acceleration
C:
momentum
D:
none of these
Answer: A
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A framed structure, as shown in the below figure, is a
A:
perfect frame
B:
deficient frame
C:
redundant frame
D:
none of the above
Answer: A
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If the body falls freely under gravity, then the gravitational acceleration is taken as
A:
+8.9 m/s2
B:
-8.9 m/s2
C:
+9.8 m/s2
D:
-9.8 m/s2
Answer: C
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