The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

A

The sum of the two masses is equal to the total mass of body

B

The center of gravity of the two masses coincides with that of the body

C

The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body

D

All of the above

The rainfall due to upward movement of air caused by convergence of cold air masses against warm air masses is called ________.

A

Cyclonic rainfall

B

Orographic rainfall

C

Frontal rainfall

D

Convectional rainfall

A load-balancing approach where requests to one IP address are distributed among the multiple servers hosting the Website at the TCP/IP routing level is DNS (domain name server) balancing.

A

True

B

False

The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

A

1

B

2

C

3

D

4

The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

A

Unbalanced couples are caused only at higher speeds

B

Unbalanced forces are not dangerous at higher speeds

C

Effects of unbalances are proportional to the square of the speed

D

Effects of unbalances are directly proportional to the speed

The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at

A

the centre of the disc

B

the point of contact

C

an infinite distance on the plane surface

D

the point on the circumference situated vertically opposite to the contact point

Ability of goods and services to fulfill certain wants of human beings can be most appropriately explained by concept of

A

Demand

B

Utility

C

capability

D

Production

If all the factors of productions are increased in a fixed proportion , volume of production increase proportion which is greater than the proportion of increase in the factors of production -this state can be described most appropriately by -

A

Proportionate return to scale

B

Disproportionate return of scale

C

Increasing return to scale

D

Law of scale

Ability of goods and services to fulfill certain wants of human beings can be most appropriately explained by the concept of-

A

Demand

B

Unility

C

Capability

D