The cylinder dimensions of a compound engine may be designed on the basis of

The cylinder dimensions of a compound engine may be designed on the basis of ___________

A

equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders

B

equal power developed in each cylinder for uniform turning moment

C

equal temperature drop in each cylinder for economy of steam

D

all of the mentioned

Which one of the statement is correct?
1. Petrol engine is a reciprocating engine
2. Petrol engine is high speed engine
3. Petrol engine uses petrol as fuel
4. Petrol engine is internal combustion engine

A

All four are correct

B

Only 1 is correct

C

Only 4 is correct

D

All are wrong

In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

A

Equal to

B

Less than

C

More than

D

None of these

The piston rod of a hydraulic cylinder exerts an operating force of 10kN. The allowable stress in the cylinder is 45N/mm². Calculate the thickness of the cylinder using Lame’s equation. Diameter of the cylinder is 40mm and pressure in cylinder is 10MPa.

A

2.05mm

B

4.2mm

C

5.07mm

D

None of the listed

The piston rod of a hydraulic cylinder exerts an operating force of 10kN. The allowable stress in the cylinder is 70N/mm². Calculate the thickness of the cylinder using Clavarinoe’s equation. Diameter of the cylinder is 240mm.μ=0.3 and pressure in cylinder is 15MPa.

A

35mm

B

30mm

C

27mm

D

None of the listed

If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Diameter of L.P. cylinder and D₂ = Diameter of H.P. cylinder)

A

$$\frac{{{{\text{D}}_1}}}{{{{\text{D}}_2}}} = {{\text{p}}_1}{{\text{p}}_2}$$

B

$$\frac{{{{\text{D}}_1}}}{{{{\text{D}}_2}}} = \frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}$$

C

$$\frac{{{{\text{D}}_1}}}{{{{\text{D}}_2}}} = \frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}$$

D

None of these

A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

A

3.6 N/mm² compression

B

3.6 N/mm² tension

C

7.2 N/mm² compression

D

7.2 N/mm² tension

In counterfort type retaining walls
i) the vertical slab is designed as a continuous slab
ii) the heel slab is designed as a continuous slab
iii) the vertical slab is designed as a cantilever
iv) the heel slab is designed as a cantilever
The correct answer is

A

(i) and (ii)

B

(i) and (iv)

C

(ii) and (iii)

D

(iii) and (iv)

The height of a cylinder is four times the radius of the cylinder. If the volume of the cylinder is 256 cm², what is the radius of the cylinder.

A

4 cm

B

8 cm

C

16 cm

D

24 cm

Twp cylinders of equal size are filled with equal amount of ideal diatomic gas at room temperature. Both the cylinders are fitted with pistons. In cylinder A the piston is free to move, while in cylinder B the piston is fixed. When same amount of heat is added to cylinder A raises by 20 K. What will be the rise temperature of gas in cylinder B?

A

28K

B

20K

C

15K

D

10K

The cylinder dimensions of a compound engine may be designed on the basis of

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