MCQOPTIONS
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MCQOPTIONS
This section includes 180 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Select the incorrect statement which supports PWR. |
| A. | water is used as coolant |
| B. | pwr is stable in operation |
| C. | uses natural fuel |
| Answer» D. | |
| 102. |
LWR stands for |
| A. | lower water reactor |
| B. | line water reactor |
| C. | liquefied water reactor |
| D. | light water reactor |
| Answer» E. | |
| 103. |
Select the incorrect statement about PWR. |
| A. | high primary circuit pressure requires a strong pressure vessel |
| B. | corrosion is less in pwr |
| C. | during fuel charging in pwr, the reactor has to be shut down at least for a month |
| D. | pwr results in uneven heating |
| Answer» C. during fuel charging in pwr, the reactor has to be shut down at least for a month | |
| 104. |
What does the top of the pressurizer in pressurized water reactor consists of at primary system pressure? |
| A. | steam |
| B. | air |
| C. | water |
| D. | fluids |
| Answer» B. air | |
| 105. |
PWR stands for |
| A. | power |
| B. | partially weathered rock |
| C. | pressurized water reactor |
| D. | packaging waste regulations |
| Answer» D. packaging waste regulations | |
| 106. |
In economics of nuclear power plant taxes and insurance charges are taken as |
| A. | operating cost |
| B. | maintenance cost |
| C. | capital cost |
| D. | fixed cost |
| Answer» E. | |
| 107. |
What efficiencies of thermionic power generator have been realised? |
| A. | 50-60% |
| B. | 40-50% |
| C. | 10-20% |
| D. | 30-40% |
| Answer» D. 30-40% | |
| 108. |
Which of these is not a component of nuclear reactor? |
| A. | reactor core |
| B. | refractor |
| C. | control rod |
| D. | biological shield |
| Answer» C. control rod | |
| 109. |
Which of the following is not a type of Combined Plant? |
| A. | sodium- mercury-potassium plant |
| B. | gas turbine-steam turbine plant |
| C. | thermionic steam plant |
| D. | thermoelectric steam plant |
| Answer» B. gas turbine-steam turbine plant | |
| 110. |
What happens to the availability in a combined cycle plant? |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | cannot say |
| Answer» B. increases | |
| 111. |
The maximum steam temperature in a |
| A. | 600 |
| B. | 500 |
| C. | 300 |
| D. | 100 |
| Answer» B. 500 | |
| 112. |
The gas turbine power plant mainly uses which among the following fuels? |
| A. | coal and peat |
| B. | kerosene oil and diesel oil and residual oil |
| C. | gas oil |
| D. | natural gas and liquid petroleum fuel |
| Answer» E. | |
| 113. |
The temperature in a dry bottom pulverised coal furnace, in degree Celsius is about? |
| A. | 1200 |
| B. | 1300 |
| C. | 1400 |
| D. | 2000 |
| Answer» C. 1400 | |
| 114. |
Which type of compressor is used in a gas turbine plant? |
| A. | reciprocating compressor |
| B. | screw compressor |
| C. | multistage axial flow compressor |
| D. | either reciprocating compressor & screw compressor |
| Answer» D. either reciprocating compressor & screw compressor | |
| 115. |
What part or % of power developed is utilised for driving the compressor? |
| A. | 65 % |
| B. | 70 % |
| C. | 55 % |
| D. | 80 % |
| Answer» B. 70 % | |
| 116. |
A Gas Turbine is which type of combustion plant? |
| A. | external |
| B. | open |
| C. | internal |
| D. | cannot say |
| Answer» D. cannot say | |
| 117. |
Power is produced when the working fluid does some work on the? |
| A. | shaft |
| B. | fins |
| C. | blades |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 118. |
What would be the temperature of the gas in the combustion chamber? |
| A. | 500 °c |
| B. | 1600 °c |
| C. | 1200 °c |
| D. | 650 °c |
| Answer» C. 1200 °c | |
| 119. |
What is the air standard cycle for a Gas- Turbine called? |
| A. | reheat cycle |
| B. | rankine cycle |
| C. | brayton cycle |
| D. | diesel cycle |
| Answer» D. diesel cycle | |
| 120. |
What is meant by inter cooling? |
| A. | removal of heat from compressed air between stages of compression |
| B. | transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber |
| C. | to increase the temperature of partially expanded gases by burning more fuel |
| D. | none of the mentioned |
| Answer» B. transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber | |
| 121. |
What is regeneration? |
| A. | removal of heat from compressed air between stages of compression |
| B. | transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber |
| C. | to increase the temperature of partially expanded gases by burning more fuel |
| D. | transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber and increases the temperature of partially expanded gases by burning more fuel |
| Answer» C. to increase the temperature of partially expanded gases by burning more fuel | |
| 122. |
Which of these is a working fluid in the bottoming plant of a Brayton-Rankine combined plant? |
| A. | mercury |
| B. | steam |
| C. | water |
| D. | air |
| Answer» D. air | |
| 123. |
If e is the electricity fraction of the total energy output, m is the electric plant efficiency and n is the steam generator efficiency; the heat added per unit total energy output is given by? |
| A. | (1 / m) + ((1 – e) / n) |
| B. | (1 / n) + ((1 – e) / m) |
| C. | (1 / m) + ((1 + e) / n) |
| D. | (1 / n) + ((1 – e) / m) |
| Answer» B. (1 / n) + ((1 – e) / m) | |
| 124. |
Which of the following is a good medium for constant temperature heating? |
| A. | water |
| B. | steam |
| C. | coolant |
| D. | diesel |
| Answer» C. coolant | |
| 125. |
The cogeneration plant efficiency nCO if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by? |
| A. | nco = (wt + qi) / qh |
| B. | nco = (wt – qi) / qh |
| C. | nco = (wt + qh) / qi |
| D. | nco = (wt + qh) / qi |
| Answer» E. | |
| 126. |
Which of these is not considered economical for cogeneration? |
| A. | a high fraction of electric to total energy |
| B. | a low fraction of electric to total energy |
| C. | a low fraction of total energy to electric energy |
| D. | none of the mentioned |
| Answer» C. a low fraction of total energy to electric energy | |
| 127. |
In a by-product power cycle? |
| A. | the power is produced initially |
| B. | power production is in the middle stages of the cycle |
| C. | power production is after the cycle has ended |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 128. |
In terms of cost per MW compared to condensing sets of the same power, the back pressure turbines are? |
| A. | more expensive |
| B. | cheaper |
| C. | costly |
| D. | none of the mentioned |
| Answer» C. costly | |
| 129. |
In a back pressure turbine |
| A. | pressure at the exhaust from the turbine is the saturation pressure corresponding to the temperature desired in the process |
| B. | pressure at the entrance of the turbine is the saturation pressure corresponding to the temperature desired in the process |
| C. | pressure at the exhaust from the turbine is the saturation pressure corresponding to the pressure desired in the process |
| D. | none of the mentioned |
| Answer» B. pressure at the entrance of the turbine is the saturation pressure corresponding to the temperature desired in the process | |
| 130. |
A plant producing both, electrical power & process heat simultaneously is? |
| A. | cogenital plant |
| B. | cogenerial plant |
| C. | cogeneration plant |
| D. | conglomerate plant |
| Answer» D. conglomerate plant | |
| 131. |
Chemical method of treatment is used for treatment of: |
| A. | diissolve gases |
| B. | carbonate and carbon dioxide |
| C. | bacterial impurities |
| D. | send and suspended materials |
| Answer» C. bacterial impurities | |
| 132. |
Thermal treatment methods used to remove impurities like: |
| A. | dissolved carbon dioxide and other gases |
| B. | solid materials |
| C. | carbonate |
| D. | bacterial impurities |
| Answer» B. solid materials | |
| 133. |
Which method is used in large modern thermal power plants to heat feed water? |
| A. | open type heatre is used |
| B. | close type heater is used |
| C. | steam is directly taken from main turbine and used to heat it feed water |
| D. | surface type heater is used |
| Answer» D. surface type heater is used | |
| 134. |
Mechanical method of water treatment is done to |
| A. | heat the feed water |
| B. | to remove solid matter and impurities |
| C. | to add some solid materials |
| D. | to remove dissolved gases |
| Answer» C. to add some solid materials | |
| 135. |
Which of these is not a type of drive of variable speed control? |
| A. | variable speed turbine |
| B. | hydraulic coupling |
| C. | multiple speed ac motor |
| D. | electronically adjustable turbine drive |
| Answer» E. | |
| 136. |
Feed water for boiler of thermal power plant is obtained from: |
| A. | natural sources like river and lake |
| B. | partly from condensed steam and natural sources |
| C. | condensed steam and small percentage from natural resources |
| D. | natural sources and small percentage from condensed steam |
| Answer» D. natural sources and small percentage from condensed steam | |
| 137. |
Which of the following types of the fans has the highest cost? |
| A. | centrifugal fans |
| B. | axial fans |
| C. | primary fans |
| D. | gas recirculation fans |
| Answer» C. primary fans | |
| 138. |
In a furnace employing forced draught compared to induced draught |
| A. | the fan operates hot and hence blades are liable to corrosion and erosion |
| B. | positive pressure exists in the furnace |
| C. | air is sucked in, so air leaks are more and hence furnace efficiency is reduced |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 139. |
Which of these accentuates clinkering trouble on furnace grate burning coal? |
| A. | low reactivity of carbonised residue containing high proportions of iron and sulphur |
| B. | low forced draught and low fuel bed temperature |
| C. | thick fire bed and preheated primary air |
| D. | all of the mentioned |
| Answer» E. | |
| 140. |
Stack heat losses can be minimised by |
| A. | using low c.v. fuels |
| B. | controlling the excess air |
| C. | oxygen enrichment of combustion air |
| D. | maintaining proper draft in the furnace |
| Answer» C. oxygen enrichment of combustion air | |
| 141. |
Which of these is not a type of mechanical draft system for a furnace? |
| A. | balanced draft |
| B. | induced draft |
| C. | forced draft |
| D. | actuated draft |
| Answer» E. | |
| 142. |
6 DRAUGHT SYSTEM |
| A. | Δp = gh(Ïa-Ïg) |
| B. | Δp = gh(Ïg-Ïa) |
| C. | Δp = ghÏg |
| D. | Δp = gh(Ïa+Ïg) |
| Answer» B. Δp = gh(Ïg-Ïa) | |
| 143. |
What is the capacity of low pressure hydraulic ash handling system? |
| A. | 80 tonnes/hour |
| B. | 22 tonnes/hour |
| C. | 50 tonnes/hour |
| D. | 10 tonnes/hour |
| Answer» D. 10 tonnes/hour | |
| 144. |
What would be the amount of distance that a low pressure system could carry the ash? |
| A. | 25m |
| B. | 500m |
| C. | 150m |
| D. | 800m |
| Answer» C. 150m | |
| 145. |
Which of these terms defines the pressure difference in the furnace? |
| A. | draught |
| B. | duct |
| C. | stack |
| D. | chimney |
| Answer» B. duct | |
| 146. |
Which medium is used to carry ash in hydraulic system? |
| A. | air |
| B. | water |
| C. | steam |
| D. | conveyor |
| Answer» C. steam | |
| 147. |
Which system is noisy out of all the following ash handling systems? |
| A. | steam jet ash handling system |
| B. | mechanical ash handling system |
| C. | pneumatic ash handling system |
| D. | hydraulic ash handling system |
| Answer» D. hydraulic ash handling system | |
| 148. |
Which medium is used to carry ash in the pneumatic ash handling system? |
| A. | conveyor belt |
| B. | water trough |
| C. | air |
| D. | chain belt |
| Answer» D. chain belt | |
| 149. |
What is the function of cyclone separators in pneumatic ash handling system? |
| A. | to separate the lighter dust particles |
| B. | to force up the movement of ash through pipes or tubes |
| C. | to draw out the dust from furnace |
| D. | to separate minute coal particles |
| Answer» B. to force up the movement of ash through pipes or tubes | |
| 150. |
The coal is fed to the furnace through |
| A. | conveyor belt |
| B. | wagon tipper |
| C. | hopper |
| D. | crane |
| Answer» D. crane | |