MCQOPTIONS
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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2101. |
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, = Density of substance, S = Specific heat, and k = Thermal conductivity) |
| A. | <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/406-40-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/406-40-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/406-40-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/406-40-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/406-40-2.png"> | |
| 2102. |
At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2103. |
Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2104. |
The capillary tube is not used in large capacity refrigeration systems because |
| A. | cost is too high |
| B. | capacity control is not possible |
| C. | it is made of copper |
| D. | required pressure drop can not be achieved |
| Answer» C. it is made of copper | |
| 2105. |
The ratio of emissive power of a body to the emissive power of a perfectly black body is called emissivity. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2106. |
The thermal diffusivity for solids is generally less than those for liquids and gases. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2107. |
Carbon dioxide is |
| A. | colourless |
| B. | odourless |
| C. | non-flammable |
| D. | all of these |
| Answer» E. | |
| 2108. |
The reduced ambient air cooling system has |
| A. | one cooling turbine and one heat exchanger |
| B. | one cooling turbine and two heat exchangers |
| C. | two cooling turbines and one heat exchanger |
| D. | two cooling turbines and two heat exchangers |
| Answer» D. two cooling turbines and two heat exchangers | |
| 2109. |
The heat of sun reaches to us according to |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | none of these |
| Answer» D. none of these | |
| 2110. |
The specific humidity during humidification process |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| Answer» C. decreases | |
| 2111. |
The central air conditioning system has __________ overall efficiency as compared to individual systems. |
| A. | same |
| B. | lower |
| C. | higher |
| Answer» D. | |
| 2112. |
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as |
| A. | Wien's law |
| B. | Stefan's law |
| C. | Kirchhoff's law |
| D. | Planck's law |
| Answer» D. Planck's law | |
| 2113. |
The product of Reynolds number and Prandtl number is known as |
| A. | Stanton number |
| B. | Biot number |
| C. | Peclet number |
| D. | Grashoff number |
| Answer» D. Grashoff number | |
| 2114. |
Cartidge brass can be |
| A. | cold rolled into sheets |
| B. | drawn into wires |
| C. | formed into tube |
| D. | any one of these |
| Answer» E. | |
| 2115. |
Blast furnace is used to produce |
| A. | pig iron |
| B. | cast iron |
| C. | wrought iron |
| D. | steel |
| Answer» B. cast iron | |
| 2116. |
Which of the following refrigerant has the maximum ozone depletion potential in the stratophere? |
| A. | Ammonia |
| B. | Carbon dioxide |
| C. | Sulphur dioxide |
| D. | Flourine |
| Answer» E. | |
| 2117. |
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be |
| A. | 1/4 |
| B. | 1/3 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 2118. |
A refrigerant with the highest critical pressure is |
| A. | R-11 |
| B. | R-12 |
| C. | R-22 |
| D. | Ammonia |
| Answer» E. | |
| 2119. |
In a shell and tube heat exchanger, baffles are provided on the shell side to |
| A. | improve heat transfer |
| B. | provide support for tubes |
| C. | prevent stagnation of shell side fluid |
| D. | all of these |
| Answer» E. | |
| 2120. |
In an isothermal process, |
| A. | there is no change in temperature |
| B. | there is no change in enthalpy |
| C. | there is no change in internal energy |
| D. | all of these |
| Answer» E. | |
| 2121. |
The heat absorbed during a polytropic process is |
| A. | <img src="/_files/images/mechanical-engineering/thermodynamics/244-125-1.png"> |
| B. | x Workdone |
| C. | <img src="/_files/images/mechanical-engineering/thermodynamics/244-125-2.png"> |
| D. | <img src="/_files/images/mechanical-engineering/thermodynamics/244-125-3.png"> |
| E. | all of these |
| Answer» E. all of these | |
| 2122. |
An adiabatic process is one in which |
| A. | no heat enters or leaves the gas |
| B. | the temperature of the gas changes |
| C. | the change in internal energy is equal to the mechanical workdone |
| D. | all of the above |
| Answer» E. | |
| 2123. |
The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Charles' law. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 2124. |
When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency. |
| A. | zero |
| B. | 1/5 |
| C. | 4/5 |
| D. | 1 |
| Answer» B. 1/5 | |
| 2125. |
Which of the following is the correct statement of the second law of thermodynamics? |
| A. | It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work. |
| B. | It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source. |
| C. | There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy. |
| D. | all of the above |
| Answer» E. | |
| 2126. |
Liquid fuels have higher calorific value than solid fuels. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2127. |
Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2128. |
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as |
| A. | principle of independence of forces |
| B. | principle of resolution of forces |
| C. | principle of transmissibility of forces |
| D. | none of these |
| Answer» C. principle of transmissibility of forces | |
| 2129. |
The centre of gravity of an is osceles triangle with base (p) and sides (q) from its base is |
| A. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-69-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-69-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-69-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-69-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-69-2.png"> | |
| 2130. |
The loss of kinetic energy during inelastic impact, is given by(where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.) |
| A. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/49-288-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/49-288-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/49-288-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/49-288-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/49-288-2.png"> | |
| 2131. |
The centre of gravity of a hemisphere lies at a distance of 3r / 8 from its base measured along the vertical radius. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2132. |
The coefficient of discharge for an external mouthpiece is |
| A. | 0.375 |
| B. | 0.5 |
| C. | 0.707 |
| D. | 0.855 |
| Answer» E. | |
| 2133. |
A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by |
| A. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/170-247-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/170-247-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/170-247-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/170-247-4.png"> |
| Answer» E. | |
| 2134. |
The volume per unit mass of a liquid is called specific volume. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2135. |
Which of the following is an amorphous material? |
| A. | Mica |
| B. | Silver |
| C. | Lead |
| D. | Glass |
| Answer» E. | |
| 2136. |
Martensite has needle like structure and is magnetic. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2137. |
Which of the following display properties similar to that of steel? |
| A. | Blackheart cast iron |
| B. | Whiteheart cast iron |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 2138. |
Which of the following metal is used for nuclear energy? |
| A. | Uranium |
| B. | Thorium |
| C. | Niobium |
| D. | all of these |
| Answer» E. | |
| 2139. |
A steel containing ferrite and pearlite is |
| A. | hard |
| B. | soft |
| C. | tough |
| D. | hard and tough |
| Answer» C. tough | |
| 2140. |
The iron ore in the charge of blast furnace acts as an iron bearing mineral. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2141. |
The charge of the blast furnace consists of |
| A. | calcined ore (8 parts ), coke (4 parts) and limestone (1 part) |
| B. | calcined ore (4 parts), coke (1 part) and limestone (8 parts) |
| C. | calcined ore (1 part), coke (8 part) and limestone (4 parts) |
| D. | calcined ore, coke and limestone all in equal parts |
| Answer» B. calcined ore (4 parts), coke (1 part) and limestone (8 parts) | |
| 2142. |
The maximum internal diameter of a blast furnace is about |
| A. | 3 m |
| B. | 6 m |
| C. | 9 m |
| D. | 12 m |
| Answer» D. 12 m | |
| 2143. |
When a low carbon steel is heated upto lower critical temperature, |
| A. | there is no change in grain size |
| B. | the average grain size is a minimum |
| C. | the grain size increases very rapidly |
| D. | the grain size first increases and then decreases very rapidly |
| Answer» B. the average grain size is a minimum | |
| 2144. |
Beryllium bronze contains |
| A. | 60% copper and 40% beryllium |
| B. | 80% copper and 20% beryllium |
| C. | 97.75% copper and 2.25% beryllium |
| D. | 99% copper and 1% beryllium |
| Answer» D. 99% copper and 1% beryllium | |
| 2145. |
Which of the following is a point imperfection? |
| A. | Vacancy |
| B. | Interstitial imperfection |
| C. | Frenkel imperfection |
| D. | all of these |
| Answer» E. | |
| 2146. |
The addition of manganese to aluminium improves corrosion resistance. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2147. |
In the austempering process of heat treatment, austenite changes into |
| A. | martensite |
| B. | troostite |
| C. | sorbite |
| D. | bainite |
| Answer» E. | |
| 2148. |
Steel containing 0.8 to 1.5% carbon, is known as |
| A. | mild steel |
| B. | dead mild steel |
| C. | medium carbon steel |
| D. | high carbon steel |
| Answer» E. | |
| 2149. |
The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is |
| A. | elasticity |
| B. | plasticity |
| C. | ductility |
| D. | malleability |
| Answer» C. ductility | |
| 2150. |
Which of the following statement is correct for ammonia as a refrigerant? |
| A. | It is toxic to mucous membranes. |
| B. | it requires large displacement per TR compared to fluoro carbons. |
| C. | It reacts with copper and its alloys. |
| D. | all of these |
| Answer» E. | |