The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

একটি স্টেপ আপ ট্রান্সফরমারে, গৌণ কুণ্ডলীর পাকসংখ্যা মুখ্য কুন্ডলীর পাকসংখ্যার দ্বিগুণ। যদি মূখ্য কুন্ডলীকে কোন পরিবর্তী বিদ্যুৎ লাইনের সাথে সংযুক্ত করা হয়, তাহলে মুখ্য কুণ্ডলীর তুলনায় গৌণ কুণ্ডলীতে- (In a step up transformer, the number of turns in the secondary coil is twice to that of primary coil. If you apply an alternating current in the primary coil, then in the secondary coil compared to the primary coil-)

A

তড়িৎ প্রবাহের মান দ্বিগুণ হবে (current will be doubled)

B

তড়িৎ প্রবাহের মান অর্ধেক হবে (current will be halved)

C

তড়িৎ বিভবের মান অর্ধেক হবে (voltage will be halved)

D

তড়িৎ প্রবাহের মান সমান থাকবে (Current will remain the same)

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 certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?

A

Decreases

B

Increases

C

Remains same

D

First increases and then decreases depending on the depth of iron in¬sertion

If a spring is cut down into two springs, the stiffness of cut springs will be

A

Half

B

Same

C

Double

D

None of the above

In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

A

Combined effect of transverse shear stress and bending stress in the wire

B

Combined effect of bending stress and curvature of the wire

C

Combined effect of transverse shear stress and curvature of wire

D

Combined effect of torsional shear stress and transverse shear stress in the wire

In the past people used to travel on horse-drawn carriages, now everybody has motor vehicles.

A

whereas

B

instead of

C

because

D

so that

Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B'. The ratio of deflections in spring 'A' to spring 'B' is

A

$$\frac{1}{8}$$

B

$$\frac{1}{4}$$

C

$$\frac{1}{2}$$

D

2

When two helical springs of equal lengths are arranged to form a cluster spring, then

A

Shear stress in each spring will be equal

B

Load taken by each spring will be half the total load

C

Only A is correct

D

Both A and B is correct

Two closely-coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be __________ that of spring 'B'.

A

One-sixteenth

B

One-eighth

C

One-fourth

D

One-half

Two closely coiled helical springs 'A' and 'B' are equal in all respects but the diameter of wire of spring 'A' is double that of spring 'B' The stiffness of spring 'B' will be __________ that of spring 'A'

A

One-sixteenth

B

One-eighth

C

One-fourth

D

One-half

The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

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