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Thermengineering Flashcards
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1
Question
(Choices) Is the most common dryer used which consists of a rotating cylinder inside which the materials flow while getting in contact with hot gas? A. Tower dryer B. Centrifugal dryer C. Trey dryer D. Rotary dryer
Page 1
Answer
D. Rotary Dryer
2
Question
(Choices) The ratio of the mass of water-vapor in air and the mass of air if it is saturated is called: A. Humidity ratio B. Mass ratio C. Vapor ratio D. Relative humidity
Page 1
Answer
D. Relative Humidity
3
Question
(Choices) The hands feel painfully cold when the skin temperature reaches: A. 8 deg C B. 10 deg C C. 12 deg C D. 14 deg C
Page 1
Answer
B. 10 deg C
4
Question
(Choices) The refrigerant used in steam jet cooling is: A. Steam B. R-11 C. Ammonia D. Water
Page 1
Answer
D. Water
5
Question
(Choices) The total heat of the air is a function of: A. WB temperature B. DP temperature C. DB temperature D. WB depression
Page 1
Answer
A. Wet Bulb Temperature
6
Question
(Choices) Boiling point of Freon-12 at atmospheric pressure is: A. 21 deg F B. 15 deg F C. 5 deg F D. 28 deg F
Page 1
Answer
A. 21 deg F
7
Question
(Choices) Which of the following is NOT a type of water cooled condenser in refrigeration? A. Double pipe B. Double shell C. Shell and coil D. Shell and tube
Page 2
Answer
B. Double Shell
8
Question
(Choices) Component of absorption refrigeration system in which the solution is cooled by cooling water: A. Rectifier B. Generator C. Evaporator D. Absorber
Page 2
Answer
D. Absorber
9
Question
(Choices) Cascade refrigeration cycle is often used in industrial process where objects must be cooled to temperature below: A. -46 deg C B. -56 deg C C. -66 deg C D. -76 deg C
Page 2
Answer
A. -46 deg C
10
Question
(Choices) Type of refrigerant control designed to maintain a pressure difference while the compressor is operating: A. Thermostatic expansion valve B. Using low side float flooded system C. Automatic expansion valve D. Capillary tube
Page 2
Answer
D. Capillary Tube
11
Question
(Choices) 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. A. 1 percent B. 1.5 percent C. 2 percent D. 2.5 percent
Page 2
Answer
A. 1 percent
12
Question
(Choices) Modern way of detecting air compressor leak is by using: A. Soup and water B. Air leak detector C. Acoustic leak detector D. Ammonia leak detector
Page 2
Answer
C. Acoustic Leak Detector
13
Question
(Choices) For foundation of stacks, the maximum pressure on the soil is equal to the pressure due to the weight and the ________: A. Soil movement B. Wind movement C. Ground movement D. Engine movement
Page 3
Answer
B. Wind Movement
14
Question
(Choices) Foundation bolts of specified size should be used and surrounded by a pipe sleeve with an inside diameter of at least: A. 3 times the diameter of engine bolt B. 2 times the diameter of engine bolt C. 3 times the diameter of anchor bolt D. 2 times the diameter of anchor bolt
Page 3
Answer
C. 3 times the diameter of anchor bolt
15
Question
(Choices) For multi stage compression of an ideal Brayton cycle, the back ratio will: A. Increase B. Decrease C. Remains the same D. None of these
Page 3
Answer
B. Decrease
16
Question
(Choices) Type of turbine that has a specific speed below 5: A. Impulse turbine B. Propeller turbine C. Francis turbine D. Deriaz turbine
Page 3
Answer
A. Impulse turbine
17
Question
(Choices) A high discharge type of turbine: A. Impulse turbine B. Propeller turbine C. Francis turbine D. Deriaz turbine
Page 3
Answer
B. Propeller Turbine
18
Question
(Choices) Used to minimize the speed rise due to a sudden load rejection: A. Needle valve B. Wicket gate shut-off C. Shut-off valve D. Jet deflector
Page 3
Answer
D. Jet Deflector
19
Question
(Choices) The speed of a turbine when the head on the turbine is one meter is called: A. Specific speed B. Rated speed C. Utilized speed D. Unit speed
Page 3
Answer
D. Unit Speed
20
Question
(Choices) A fluid property which refers to the intermolecular attraction by which the separate particles of the fluid are held together: A. Cohesion B. Adhesion C. Surface tension D. Hypertension
Page 4
Answer
A. Cohesion
21
Question
(Choices) Which of the following is NOT the cause of black smoke in diesel engine? A. Fuel valve open too long B. High compression pressure C. Carbon in exhaust pipe D. Overload on engine
Page 4
Answer
B. High Compression pressure
22
Question
(Choices) Which of the following is not a method of starting a diesel engine? A. Manual: rope, crank and kick B. Electric (battery) C. Compressed air D. Using another generator
Page 4
Answer
D. Using another generator
23
Question
(Choices) Two-stroke engine performs _______ to complete one cycle. A. Suction and discharge stroke B. Compression and power stroke C. Power and exhaust stroke D. Suction and exhaust stroke
Page 4
Answer
B. Compression and power stroke
24
Question
(Choices) A type of geothermal plant used when there is a presence of brine extracted from underground: A. Dry geothermal plant B. Double-flash geothermal C. Single flash geothermal plant D. Binary geothermal plant
Page 4
Answer
D. Binary geothermal plant
25
Question
(Choices) The most important safety device on the power boiler is: A. Check valve B. Gate valve C. Safety valve D. Globe valve
Page 4
Answer
C. Safety valve
26
Question
(Choices) During hydrostatic test, the safety valves should be: A. Removed B. Open C. Closed D. Partially closed
Page 5
Answer
A. Removed
27
Question
(Choices) Where deaerating heaters are not employed, it is recommended that the temperature of the feed water be not less than ______: A. 197 deg C B. 102 deg C C. 104 deg C D. 106 deg C
Page 5
Answer
A. 197 deg C
28
Question
(Choices) A reaction during which chemical energy is released in the form of heat is called: A. Cosmic reaction B. Ethnic reaction C. Endothermic reaction D. Exothermic reaction
Page 5
Answer
D. Exothermic reaction
29
Question
(Choices) By reheating the steam in an ideal Rankine cycle the heat rejected will: A. Increase B. Decrease C. Remains the same D. None of these
Page 5
Answer
A. Increase
30
Question
(Choices) By increasing the boiler pressure in Rankine cycle the moisture content at boiler exit will: A. Increase B. Decrease C. Remains the same D. None of those
Page 5
Answer
A. Increase