A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then

A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then

A

Bolt and tube are under tension

B

Bolt and tube are under compression

C

Bolt is under compression and tube is under tension

D

Bolt is under tension and tube is under compression

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor and W = Axial compressive load on the spring)

A

$$\frac{{{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

B

$$\frac{{2{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

C

$$\frac{{4{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

D

$$\frac{{8{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

The connecting rod bolts are tightened up with initial tension greater than the external load so that

A

Joint may not open up

B

Bolts are weakest elements

C

The resultant load on the bolt would not be affected by the external cyclic load

D

Bolts will not loosen during service

The connecting rod bolts are tightened up so that tightening stress

A

Is just sufficient to hold parts together

B

Approaches yield point

C

Is 50% of yield point

D

Is about yield point divided by safety factor

A cylinderical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is

A

0

B

0.33

C

0.44

D

0.25

When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

A

Compression

B

Tension

C

Shear

D

Combined loads

The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.

A

Tension

B

Shear

C

Compression

D

Bending & tension

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

A

Decreases the pressure drop

B

Decreases the outlet temperature of cooling medium

C

Increases the overall heat transfer coefficient

D

None of these

When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

A

Tensile stress

B

Compressive stress

C

Shear stress

D

Bending stress

If a cohesive soil specimen is subjected to a vertical compressive load, the inclination of the cracks to the horizontal is

A

90°

B

45°

C

22.5°

D

0°

A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then

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