Engineering General Info

Question 1

A type of reciprocating stem valve used mainly as a block for fully open or fully closed services

Answer 1

Gate valve

Gate valve are often used for on-off control of fluid flow while globe valve are used for flow regulation, allowing full control of the flow

Question 2

Heat exchanger used for cases where temperature difference between the shell and the tubes is > 50 degrees

Answer 2

Floating head heat exchangers

Question 3

Type of pressure-relief device commonly used in which it is consist of pneumatically or electrically operated valves which are activated by pressure sensing instruments

Answer 3

Indirectly actuated valves

Question 4

Most common baffle used in industrial shell and tube heat exchangers

Answer 4

25% cut segmental baffle

Question 5

If the pressure recovery experienced by the liquid in the valve is enough to raise the pressure above the vapor pressure of the liquid, then the vapor bubbles starts collapsing or imploding. What do you call this implosion?

Answer 5

Cavitation

Question 6

What type of contactor is a bubble cap plate column?

Answer 6

Finite stage contactor

Question 7

Type of vessels where saddle supports are commonly installed.

Answer 7

Horizontal cylindrical vessels

Question 8

Type of vessels in which skirt support is most suitable

Answer 8

Tall vertical vessels

Question 9

Instrument for the detection of high energy decay products of radioactive nuclei, which is based on the counting of light impulses produced by radiation when it enters a crystal.

Answer 9

Scintillation counter

Question 10

Minimum plate spacing in most of the petroleum refinery distillation columns (if diameter is 73 ft)

Answer 10

18 inches

Question 11

Tube pitch in most of the shell and tube heat exchanger

Answer 11

1.25 - 1.50 times the tube diameter

Question 12

In a shell and tube heat exchanger, the logarithmic mean temperature difference is always ____________

Answer 12

Less than arithmetic average value

Question 13

Minimum baffle height in a tank

Answer 13

Twice the impeller diameter

Question 14

In a shell and tube heat exchanger, the clearance of the tube is generally _________

Answer 14

Not less than 1/4 of the tube diameter or 3/16

Question 15

In the design of a paddle agitator, the ratio paddle diameter to tank diameter is normally taken as

Answer 15

0.8

Question 16

In double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be ________.

Answer 16

More than that for fluid flow

Question 17

A temperature sensor with the following advantages: no physical contact, wide range and fast response, and measures small target or average value over large size

Answer 17

Radiation pyrometer

Question 18

A thermometer that uses the resistance of electrical conductor for measuring the temperature

Answer 18

Thermistor or resistance thermometer

Question 19

A pressure gauge (generally bourdon type) with a small-bore tubing connected to a bulb acting as a temperature sensor. It contains a fluid that expands when the temperature increases, allowing temperature measurements.

Answer 19

Filled thermal elements thermometer

Question 20

Type of vessels in which leg support is meant for

Answer 20

Small vessels

Question 21

Refers to the ability of coal to withstand breakage during handling and shipping.

Answer 21

Size stability

Question 22

A fracturing, or flaking off, of a refractory brick, or block, due to uneven heat stresses or compression caused by heat.

Answer 22

Spalling

Question 23

Ratio of the maximum controllable flow to the minimum controllable flow

Answer 23

Rangeability

Question 24

The amount of system output response proceeds beyond the desired response

Answer 24

Overshoot

Question 25

An unwanted signal that affects the system’s output signal

Answer 25

Disturbance signal