Practice Pakistan's most useful MCQs for competitive exams

For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?

• (A)  Increase
• (B)  Decrease
• (C)  Remain constant
• (D)  Either

Answer

Submitted By :Ali Uppal

A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?

• (A)  26
• (B)  42
• (C)  269
• (D)  325

Answer

Submitted By :Ali Uppal

The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?

• (A)  First power of its diameter
• (B)  Inverse of the fluid viscosity
• (C)  Inverse square of the diameter
• (D)  Square of the difference in specific weights of solid & fluid

Answer

Submitted By :Ali Uppal

For pipes that must be broken at intervals for maintenance, the connector used should be a/an__________________?

• (A)  Union
• (B)  Tee
• (C)  Reducer
• (D)  Elbow

Answer

Submitted By :Ali Uppal

A mono pump is a __________ pump ?

• (A)  Centrifugal
• (B)  Piston
• (C)  Positive acting rotary
• (D)  A group of vacuum

Answer

Submitted By :Ali Uppal

Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the___________________?

• (A)  Pipe length
• (B)  Fluid velocity in the pipe
• (C)  Time taken to close the valve
• (D)  All

Answer

Submitted By :Ali Uppal

If more than two branches of pipes are to be connected at the same point, then use a/an_________________?

• (A)  Elbow
• (B)  Union
• (C)  Tee
• (D)  None of these

Answer

Submitted By :Ali Uppal

In fluid flow, the boundary layer separation cannot occur___________________?

• (A)  In case of boundaries experiencing form drag
• (B)  At points of abrupt changes in the flow directions
• (C)  In laminar flow
• (D)  None of these

Answer

Submitted By :Ali Uppal

Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg ?

• (A)  1
• (B)  0.1
• (C)  0.01
• (D)  0.001

Answer

Submitted By :Ali Uppal

Bernoulli‟s equation does not apply to the functioning of a/an__________________?

• (A)  Venturimeter
• (B)  Orificemeter
• (C)  pitot tube
• (D)  None of these

Answer

Submitted By :Ali Uppal