When a hole or cavity to be cored is not in line with the parting surface, then a ________ is used.

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

A

Increase

B

Decrease

C

Remain the same

D

Initially increase and then decrease

A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where $$\sigma $$ = Stress for a plate with no hole i.e. nominal stress)

A

$$\sigma \left( {1 + \frac{{\text{b}}}{{2{\text{a}}}}} \right)$$

B

$$\sigma \left( {1 + \frac{{2{\text{a}}}}{{\text{b}}}} \right)$$

C

$$\sigma \left( {1 + \frac{{\text{b}}}{{3{\text{a}}}}} \right)$$

D

$$\sigma \left( {1 + \frac{{3{\text{a}}}}{{\text{b}}}} \right)$$

The steel used in steel cored conductors is usually

A

Alloy steel

B

Stainless steel

C

Mild steel

D

High speed steel

The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of

A

Iron loss in core

B

Skin effect

C

Increase in temperature

D

Capacitive effect between adjacent coil turns

The size of air cored transducers in comparison to the iron core parts is

A

Smaller

B

Larger

C

Same

D

Unpredictable

A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

A

increase

B

decrease

C

remain unaffected

D

have its shape changed

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

A

1 d

B

1.5 d

C

2.5 d

D

2 d

The width of cutting edge of a parting off tool varies from

A

3 to 12 mm

B

5 to 20 mm

C

8 to 30 mm

D

15 to 40 mm

When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where $${\tau _{\text{u}}}$$ = Ultimate shear strength of the material of the plate)

A

$${\text{dt}}{\tau _{\text{u}}}$$

B

$$\pi {\text{dt}}{\tau _{\text{u}}}$$

C

$$\frac{\pi }{4} \times {{\text{d}}^2}{\tau _{\text{u}}}$$

D

$$\frac{\pi }{4} \times {{\text{d}}^2} \times {\text{t}}{\tau _{\text{u}}}$$

If it takes 50 workers 4 hours to dig a hole, how long should it take 30 workers to dig the same hole?

A

2 hrs, 24 mins

B

6 hrs, 12 mins

C

5 hrs, 12 mins

D

6 hrs, 40 mins

When a hole or cavity to be cored is not in line with the parting surface, then a ________ is used.

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