PIPE Flashcards
1
Q
Is the ratio of the mass of water-vapor in air and the mass of air if it is saturated is called:
Humidity ratio
Mass ratio
Vapor ratio
Relative humidity
A
Relative humidity
2
Q
Is the most common dryer used which consist of rotating cylinder inside which the materials flow while getting in contact with hot gas.
Tower dryer
Centrifugal dryer
Trey dryer
Rotary dryer
A
Rotary dryer
3
Q
The hands feel painfully cold when the skin temperature reaches
8 deg C
10 deg C
12 deg C
14 deg C
A
10 deg C
4
Q
The refrigerant used in steam jet cooling is: Steam R-11 Ammonia Water
A
Water
5
Q
The total heat of the air is a function of WB temperature DP temperature DB temperature WB depression
A
WB temperature
6
Q
Boiling point of Freon-12 at atmospheric pressure is: 21 deg F 15 deg F 5 deg F 28 deg F
A
21 deg F
7
Q
Which of the following is NOT a type of water cooled condenser in refrigeration? Double pipe Double shell Shell and coil Shell and tube
A
Double shell
8
Q
Component of absorption refrigeration system in which the solution is cooled by cooling water. Rectifier Generator Evaporator Absorber
A
Absorber
9
Q
Cascade refrigeration cycle is often used in industrial process where objects must be cooled to temperature below:
- 46 deg C
- 56 deg C
- 66 deg C
- 76 deg C
A
-46 deg C
10
Q
Type of refrigerant control designed to maintain a pressure difference while the compressor is operating. Thermostatic expansion valve Using low side float flooded system Automatic expansion valve Capillary tube
A
Capillary tube
11
Q
As a rule of thumb, for a specified amount of compressed air, the power consumption of the compressor decreases by \_\_\_\_\_\_\_\_\_\_\_\_\_\_ for each 3 deg C drop in the temperature inlet air to the compressor. 1 percent 1.5 percent 2 percent 2.5 percent
A
1 percent
12
Q
Modern way of detecting air compressor leak is by using Soup and water Air leak detector Acoustic leak detector Ammonia leak detector
A
Acoustic leak detector
13
Q
For foundation of stacks, the maximum pressure on the soil is equal to the pressure due to the weight and the \_\_\_\_\_\_\_\_\_\_\_. Soil movement Wind movement Ground movement Engine movement
A
Wind movement
14
Q
Foundation bolts of specified size should be used and surrounded by a pipe sleeve with an inside diameter of at least 3 times the diameter of engine bolt 2 times the diameter of engine bolt 3 times the diameter of anchor bolt 2 times the diameter of anchor bolt
A
3 times the diameter of anchor bolt
15
Q
For multi stage compression of an ideal Brayton cycle, the back ratio will Increase Decrease Remains the same None of these
A
Decrease
16
Q
Type of turbine that has a specific speed below 5. Impulse turbine Propeller turbine Francis turbine Deriaz turbine
A
Impulse turbine
17
Q
A high discharge type of turbine Impulse turbine Propeller turbine Francis turbine Deriaz turbine
A
Propeller turbine
18
Q
Use to minimize the speed rise due to a sudden load rejection Needle valve Wicket gate shut-off Shut-off valve Jet deflector
A
Jet deflector
19
Q
Is the speed of a turbine when the head on the turbine is one meter Specific speed Rated speed Utilized speed Unit speed
A
Unit speed
20
Q
Is a fluid property which refers to the intermolecular attraction by which the separate particles of the fluid arc held together. Cohesion Adhesion Surface tension Hypertension
A
Cohesion
21
Q
Which of the following is NOT the cause of black smoke in diesel engine? Fuel valve open too long High compression pressure Carbon in exhaust pipe Overload on engine
A
High compression pressure
22
Q
Which of the following is not a method of starting a diesel engine? Manual: rope, crank and kick Electric (battery) Compressed air Using another generator
A
Using another generator
23
Q
Which of the following is NOT the cause of black smoke in diesel engine? Fuel valve open too long High compression pressure Carbon in exhaust pipe Overload on engine
A
High compression pressure
24
Q
Two-stroke engine performs \_\_\_\_\_\_\_\_ to complete one cycle. Suction and discharge stroke Compression and power stroke Power and exhaust stroke Suction and exhaust stroke
A
Compression and power stroke
25
Q
A type of geothermal plant used when there is a presence of brine extracted from underground Dry geothermal plant Double-flash geothermal Single flash geothermal plant Binary geothermal plant
A
Binary geothermal plant
26
Q
Is the most important safety device on the power boiler. Check valve Gate valve Safety valve Globe valve
A
Safety valve
27
Q
During hydrostatic test, the safety valves should be Removed Open Closed Partially closed
A
Removed
28
Q
Where de-aerating heaters are not employed, it is recommended that the temperature of the feed water be not less than \_\_\_\_\_\_ 197 deg C 102 deg C 104 deg C 106 deg C
A
197 deg C
29
Q
Is a reaction during which chemical energy is released in the form of heat. Cosmic reaction Ethnic reaction Endothermic reaction Exothermic reaction
A
Exothermic reaction
30
Q
By reheating the steam in an ideal Rankine cycle the heat rejected will. Increase Decrease Remains the same None of these
A
Increase
31
Q
By increasing the boiler pressure in Rankine cycle the moisture content at boiler exit will. Increase Decrease Remains the same None of those
A
Increase
32
Q
Presently the highest steam temperature allowed at the turbine inlet is about \_\_\_\_\_\_. 340 deg C 520 deg C 620 deg C 1020 deg C
A
620 deg C
33
Q
Two most common gases employed in Stirling and Ericsson cycles are. Air and helium Oxygen and helium Hydrogen and helium Nitrogen and helium
A
Hydrogen and helium
34
Q
In most common design of gas turbine, the pressure ratio ranges from 10 to 12 11 to 16 12 to 18 15 to 20
A
11 to 16
35
Q
In brayton cycle, the heat is transformed during what process? Constant temperature Isentropic process Isobaric process Isochoric process
A
Isobaric process
36
Q
The fuel injection process in diesel engine starts when the piston \_\_\_\_\_\_ Is at the TDC Leaving TDC Approaches TDC Halfway of the stroke
A
Approaches TDC
37
Q
If the cut-off ratio of diesel cycle increases, the cycle efficiency will Decrease Increase Remains the same None of these
A
Decrease
38
Q
The fuel used in a power plant that is used during peak periods. Gas Solid Liquid None of these
A
Liquid
39
Q
Typical compression ratio of Otto cycle is 6 8 10 12
A
8
40
Q
If joule Thomson coefficient is equal to zero, then the process will become Isentropic Isenthalpic Isobaric Isothermal
A
Isothermal
