MCQOPTIONS
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MCQOPTIONS
This section includes 463 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. |
Compounding                      efficiency at low speed. |
| A. | decrease |
| B. | increase |
| C. | maximizes |
| D. | none of the mentioned |
| Answer» C. maximizes | |
| 102. |
Reaction turbine works with the force obtained from change in pressure energy. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 103. |
A turbine having alternate blades and nozzles is called as |
| A. | impulse turbine |
| B. | reaction turbine |
| C. | impulse & reaction turbine |
| D. | none of the mentioned |
| Answer» B. reaction turbine | |
| 104. |
In condensing turbines vacuum is obtained by |
| A. | sudden pressure drop |
| B. | removal of non condensable gases |
| C. | sudden drop in pressure and by removal of non condensable gases |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 105. |
In velocity compounding the steam is expanded from the boiler pressure to condenser pressure in one set of stationary blades on nozzle. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 106. |
Which statement about impulse turbine is true? |
| A. | steam expands over blades |
| B. | steam expends completely in stationary nozzels |
| C. | steam expends partially over nozzle and turbine blades |
| D. | steam expends over blades incompletely |
| Answer» C. steam expends partially over nozzle and turbine blades | |
| 107. |
Which fuel has the lightest liquid petroleum fraction? |
| A. | diesel |
| B. | petrol |
| C. | distillate |
| D. | kerosene |
| Answer» C. distillate | |
| 108. |
What does regenerative air preheater consists of? |
| A. | rotor |
| B. | skewers |
| C. | propeller |
| D. | piston |
| Answer» B. skewers | |
| 109. |
Tubular air preheater of a boiler is also called as |
| A. | recuperative air preheater |
| B. | elliptical air preheater |
| C. | ovoid air preheater |
| D. | squarish air preheater |
| Answer» B. elliptical air preheater | |
| 110. |
Gas flows through the nozzle from an area of            pressure (called the chamber) to one of            pressure |
| A. | high, low |
| B. | low, high |
| C. | same, same |
| D. | constant, infinite |
| Answer» B. low, high | |
| 111. |
When a gas is pushed through a pipe, the gaseous molecules are                    by the pipe’s walls |
| A. | attracted |
| B. | absorbed |
| C. | deflected |
| D. | dissipated |
| Answer» D. dissipated | |
| 112. |
A cubical block rests on an inclined plane of μ = 1/√3, determine the angle of inclination when the block just slides down the inclined plane? |
| A. | 40° |
| B. | 50° |
| C. | 30° |
| D. | 20° |
| Answer» D. 20° | |
| 113. |
The coefficient of kinetic friction is less than the coefficient of static friction. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 114. |
Compressible flow is a flow that deals with |
| A. | fluid temperature |
| B. | fluid pressure |
| C. | fluid density |
| D. | fluid geometry |
| Answer» D. fluid geometry | |
| 115. |
The exit velocity in the nozzle increases as per |
| A. | stagnation point |
| B. | continuity equation |
| C. | prandtl number |
| D. | newton’s law |
| Answer» C. prandtl number | |
| 116. |
Critical pressure ratio is ratios of pressures at                    discharge. |
| A. | minimum |
| B. | none of the mentioned |
| C. | optimum |
| D. | maximum |
| Answer» E. | |
| 117. |
A nozzle used to send fluid in coherent stream is called as |
| A. | jet |
| B. | high velocity nozzle |
| C. | every nozzle sends fluid in coherent stream |
| D. | none of the mentioned |
| Answer» B. high velocity nozzle | |
| 118. |
In fountains the type of nozzle used is |
| A. | none of the mentioned |
| B. | turbulent jet |
| C. | high speed nozzle |
| D. | laminar jet |
| Answer» E. | |
| 119. |
Cooling towers are rated in terms of |
| A. | approach |
| B. | range |
| C. | both of the mentioned |
| D. | none of the |
| Answer» D. none of the | |
| 120. |
When humidity ratio of air ____ air is said to be dehumidified. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» C. remains constant | |
| 121. |
When unsaturated air flows over a sheet of water in an insulated chamber |
| A. | specific humidity of air decreases |
| B. | the water evaporates |
| C. | both air and water are cooled during evaporation |
| D. | all of the mentioned |
| Answer» B. the water evaporates | |
| 122. |
The wet bulb temperature is the ____ temperature recorded by moistened bulb. |
| A. | lowest |
| B. | highest |
| C. | atmospheric |
| D. | none of the mentioned |
| Answer» B. highest | |
| 123. |
The COP of absorption refrigeration system is |
| A. | low |
| B. | high |
| C. | equal to that of vapour compression refrigeration system |
| D. | none of the mentioned |
| Answer» B. high | |
| 124. |
Water is used as a ____ in air conditioning units. |
| A. | absorbent |
| B. | refrigerant |
| C. | absorbent and refrigerant |
| D. | none of the mentioned |
| Answer» C. absorbent and refrigerant | |
| 125. |
why is an analyser-rectifier combination is used in absorption refrigeration cycle? |
| A. | to increase the amount of water vapour in ammonia vapour |
| B. | to decrease the amount of water vapour in ammonia vapour |
| C. | to eliminate the water vapour from ammonia vapour |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 126. |
The vapour going to condenser is ____ in temperature and ____ in ammonia. |
| A. | higher, less |
| B. | higher, richer |
| C. | lower, less |
| D. | lower, richer |
| Answer» E. | |
| 127. |
An increase in diameter means a _________ heat transfer coefficient. |
| A. | larger |
| B. | smaller |
| C. | zero |
| D. | infinite |
| Answer» C. zero | |
| 128. |
If there is a decrease in viscosity, the heat transfer coefficient ____________ |
| A. | increase |
| B. | decrease |
| C. | remains same |
| D. | becomes zero |
| Answer» B. decrease | |
| 129. |
Double pipe water cooling condensers have a capacity at around ________ |
| A. | 10 tr |
| B. | 20 tr |
| C. | 30 tr |
| D. | 50 tr |
| Answer» B. 20 tr | |
| 130. |
In evaporative condensers, ___________ used to extract heat from the condensing refrigerant. |
| A. | air is |
| B. | both air and water are |
| C. | water is |
| D. | either air or water is |
| Answer» C. water is | |
| 131. |
Shell and coil type condensers have a capacity at around ________ |
| A. | 10 tr |
| B. | 20 tr |
| C. | 30 tr |
| D. | 50 tr |
| Answer» E. | |
| 132. |
Which type of fins are the most commonly used fin type in condensers? |
| A. | annular fin |
| B. | plate type fins |
| C. | tube fin |
| D. | extended double pipe |
| Answer» C. tube fin | |
| 133. |
What is the relation between heat rejection ratio (HRR) and Coefficient of performance (COP)? |
| A. | hrr = 1 + 1/cop |
| B. | hrr = 1+ cop |
| C. | hrr = cop/2 |
| D. | hrr = 1/cop |
| Answer» B. hrr = 1+ cop | |
| 134. |
Evaporative condensers are used in places where water is _________ |
| A. | scarce |
| B. | plenty |
| C. | moderately available |
| D. | sufficient |
| Answer» B. plenty | |
| 135. |
Evaporative condensers combine the features of a _____________ in a single unit. |
| A. | cooling tower and water-cooled condenser |
| B. | falling tower and water-cooled condenser |
| C. | cooling tower and air condenser |
| D. | rising film tower and water-cooled condenser |
| Answer» B. falling tower and water-cooled condenser | |
| 136. |
In traditional Air conditioners in home appliances, what is the type of condenser used? |
| A. | natural convection type |
| B. | forced convection type |
| C. | flash type |
| D. | rotary condensers |
| Answer» C. flash type | |
| 137. |
What is the meaning of heat rejection ratio (HRR) of a condenser? |
| A. | ratio of heat rejected to the heat absorbed |
| B. | ratio of heat absorbed to the heat rejected |
| C. | ratio of heat required to the heat lost |
| D. | ratio of heat wasted in a cycle to the heat absorbed |
| Answer» B. ratio of heat absorbed to the heat rejected | |
| 138. |
In traditional Refrigerators in home appliances, what is the type of condenser used? |
| A. | natural convection type |
| B. | forced convection type |
| C. | furnace type |
| D. | rotary condensers |
| Answer» B. forced convection type | |
| 139. |
Condensers and evaporators together form a ____________ |
| A. | heat exchanger |
| B. | refrigeration system |
| C. | thermocouple |
| D. | heating system |
| Answer» C. thermocouple | |
| 140. |
The process of extraction of the certain required amount of water from air is known as ___________ |
| A. | heating |
| B. | cooling |
| C. | humidification |
| D. | dehumidification |
| Answer» E. | |
| 141. |
The reciprocal of thermal conductivity is known as __________ |
| A. | thermal conductance |
| B. | surface resistance |
| C. | specific conductance |
| D. | thermal resistivity |
| Answer» E. | |
| 142. |
The total loss in a tertiary cycle is? |
| A. | sum of losses in the individual cycles |
| B. | product of losses in the individual cycles |
| C. | sum of products of individual losses |
| D. | none of the mentioned |
| Answer» C. sum of products of individual losses | |
| 143. |
In case of mercury-steam-sulphur dioxide cycle, which is the bottoming fluid? |
| A. | mercury |
| B. | steam |
| C. | sulphur dioxide |
| D. | cannot say |
| Answer» D. cannot say | |
| 144. |
Room air conditioners and packaged units are examples of _________ |
| A. | direct expansion systems |
| B. | indirect expansion systems |
| C. | chilled water systems |
| D. | indirect contraction systems |
| Answer» B. indirect expansion systems | |
| 145. |
In case of Sodium-mercury-steam cycle, which is the topping fluid? |
| A. | mercury |
| B. | steam |
| C. | sodium |
| D. | cannot say |
| Answer» D. cannot say | |
| 146. |
Which of these can be used as a fluid in the bottoming fluid? |
| A. | mercury |
| B. | ammonia |
| C. | calcium |
| D. | sodium |
| Answer» C. calcium | |
| 147. |
Which of these can also be used as a topping fluid? |
| A. | sodium |
| B. | calcium |
| C. | boron |
| D. | titanium |
| Answer» B. calcium | |
| 148. |
The addition of sulphur dioxide in a tertiary cycle is at? |
| A. | high temperature |
| B. | low temperature |
| C. | too high temperature |
| D. | none of the mentioned |
| Answer» C. too high temperature | |
| 149. |
In the mercury steam cycle, the steam cycle is called? |
| A. | bottoming cycle |
| B. | middle cycle |
| C. | topping cycle |
| D. | none of the mentioned |
| Answer» B. middle cycle | |
| 150. |
Apart from mercury & steam, which of these is a component of tertiary cycle? |
| A. | nitrogen di-oxide |
| B. | water |
| C. | carbon di-oxide |
| D. | sulphur di-oxide |
| Answer» E. | |