MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Optical activity is a/an __________ property. |
| A. | additive |
| B. | constitutive |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 102. |
Percentage of differential pressure lost in a venturimeter with a tapering of 15 may be about |
| A. | 1 |
| B. | 10 |
| C. | 25 |
| D. | 50 |
| Answer» C. 25 | |
| 103. |
Diamagnetic materials |
| A. | are magnetised by eddy currents only. |
| B. | are non-magnetic and can not be magnetised. |
| C. | are magnetised in direction opposite to the magnetic field. |
| D. | can be magnetised in one direction only. |
| Answer» D. can be magnetised in one direction only. | |
| 104. |
During sensible heating of humid air |
| A. | relative humidity increases. |
| B. | dew point remains constant. |
| C. | dry bulb & wet bulb temperature increases. |
| D. | both 'b' & 'c'. |
| Answer» E. | |
| 105. |
Stresses encountered in the metal forming processes are less than the __________ of the material. |
| A. | fracture strength |
| B. | yield strength |
| C. | elastic limit |
| D. | limit of proportionality |
| Answer» B. yield strength | |
| 106. |
Fibre reinforced plastic (FRP) are |
| A. | made of glass fibre and thermoplastic resins. |
| B. | anisotropic. |
| C. | made of thermosetting resin and glass fibre. |
| D. | both 'b' & 'c' |
| Answer» E. | |
| 107. |
X-rays are |
| A. | positively charged. |
| B. | negatively charged. |
| C. | neutral. |
| D. | of higher wavelength than visible light. |
| Answer» D. of higher wavelength than visible light. | |
| 108. |
__________ are not emitted by radioactive substances. |
| A. | -rays |
| B. | -rays |
| C. | protons |
| D. | positrons |
| Answer» D. positrons | |
| 109. |
If Reynolds number is greater than 1, then the |
| A. | viscous force is larger than the inertia force. |
| B. | inertia force is larger than the viscous force. |
| C. | inertia force is larger than the surface tension force. |
| D. | inertia force is larger than the gravitational force. |
| Answer» C. inertia force is larger than the surface tension force. | |
| 110. |
Which of the following is a permanent fastening? |
| A. | Rivets |
| B. | Bolts |
| C. | Screws |
| D. | Keys |
| Answer» B. Bolts | |
| 111. |
Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore? |
| A. | Copper |
| B. | Mercury |
| C. | Lead |
| D. | None of these |
| Answer» C. Lead | |
| 112. |
Load cells used for the measurement of weight has |
| A. | compact & rugged construction with an accuracy of 0.1 to 1%. |
| B. | no moving parts and incurs negligible deflection under load. |
| C. | provision of thermal compensation and is hermetically sealed. |
| D. | all 'a', 'b' & 'c' |
| Answer» E. | |
| 113. |
Heat transfer by __________ is almost absent in case of fluidised bed drying operation. |
| A. | radiation |
| B. | conduction |
| C. | convection |
| D. | both (b) & (c) |
| Answer» B. conduction | |
| 114. |
Highest cutting speed is achieved by the __________ tool material. |
| A. | high speed steel |
| B. | carbide |
| C. | cast alloy |
| D. | plain carbon steel |
| Answer» C. cast alloy | |
| 115. |
Stainless steel is welded using |
| A. | oxy-acetylene flame. |
| B. | oxy-hydrogen flame. |
| C. | arc welding. |
| D. | inert gas arc welding. |
| Answer» E. | |
| 116. |
'Amortization' in respect of financial obligation of a company means the |
| A. | liquidation of financial obligations on instalment basis. |
| B. | commitment of financial obligation on priority. |
| C. | liquidation of all the obsolete equipments of the company. |
| D. | modernisation of the plant equipments. |
| Answer» B. commitment of financial obligation on priority. | |
| 117. |
Hydraulic intensifier is used for increasing the |
| A. | rate of velocity of liquid supply. |
| B. | rate of flow through delivery pipeline of a pump. |
| C. | intensity of pressure of the liquid. |
| D. | momentum rate through delivery pipe. |
| Answer» D. momentum rate through delivery pipe. | |
| 118. |
Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter. |
| A. | 5 |
| B. | 50 |
| C. | 500 |
| D. | 1000 |
| Answer» C. 500 | |
| 119. |
Pascal's law is valid, only when the fluid is |
| A. | frictionless and at rest. |
| B. | at rest. |
| C. | at rest and when the frictionless fluid is in motion. |
| D. | none of these. |
| Answer» C. at rest and when the frictionless fluid is in motion. | |
| 120. |
Pick out the Kozney-Karman equation (valid for low NRe) for fluid flow through a packed bed of solids. |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-4.png"> |
| Answer» D. <img src="/_files/images/chemical-engineering/fluid-mechanics/14-194-4.png"> | |
| 121. |
One dimensional fluid flow implies the |
| A. | flow in straight lines only. |
| B. | uniform flow. |
| C. | steady uniform flow. |
| D. | flow in which transverse components are zero. |
| Answer» E. | |
| 122. |
The discharge through a venturimeter depends upon |
| A. | pressure drop only. |
| B. | its orientation. |
| C. | co-efficient of contraction only. |
| D. | none of these. |
| Answer» B. its orientation. | |
| 123. |
The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density. |
| A. | directly as |
| B. | inversely as square root of |
| C. | inversely as |
| D. | as square of |
| Answer» B. inversely as square root of | |
| 124. |
Gradually varied flow in open channel is a/an __________ flow. |
| A. | steady uniform |
| B. | steady non-uniform |
| C. | unsteady uniform |
| D. | unsteady non-uniform |
| Answer» C. unsteady uniform | |
| 125. |
At low Reynolds number |
| A. | viscous forces are unimportant. |
| B. | viscous forces control. |
| C. | viscous forces control and inertial forces are unimportant. |
| D. | gravity forces control. |
| Answer» D. gravity forces control. | |
| 126. |
Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm). |
| A. | H |
| B. | 12.6 H |
| C. | 13.6 H |
| D. | 14.6 H |
| Answer» C. 13.6 H | |
| 127. |
What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» B. 1 | |
| 128. |
Hydraulic mean radius for flow through packed bed of spherical particle of size, 'Dp, with porosity ' ' is |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/55-731-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/55-731-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/55-731-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/55-731-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/fluid-mechanics/55-731-2.png"> | |
| 129. |
Slugging occurs in a fluidised bed, if the bed is |
| A. | narrow |
| B. | deep |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 130. |
The Reynolds number for an ideal fluid flow is |
| A. | 4 |
| B. | 2100-4000 |
| C. | 4000 |
| D. | |
| Answer» E. | |
| 131. |
The most prominent single cause of corrosion in boilertubes, drums, economisers and steam superheaters in a thermal power plant boiler is the |
| A. | water alkalinity & leakage. |
| B. | hydrazine addition during feed water treatment. |
| C. | release of non-condensable gas from water in the boiler. |
| D. | scale formation. |
| Answer» D. scale formation. | |
| 132. |
A gas |
| A. | signifies absence of density. |
| B. | can resist shearing action. |
| C. | is incompressible. |
| D. | is a supercritical vapor. |
| Answer» E. | |
| 133. |
Pick out the wrong statement about powder metallurgy technique. |
| A. | Powder metallurgy techniques are applied at room temperature. |
| B. | Final product in powder metallurgy is not necessarily metallic powder. |
| C. | The final product in powder metallurgy is made from metallic powder. |
| D. | Silver and nickel when melted together do not mix to form an alloy ; however alloy of these constituents can be made by powder metallurgy technique. |
| Answer» B. Final product in powder metallurgy is not necessarily metallic powder. | |
| 134. |
__________ number is sometimes used in place of Grashoff number in free convection heat transfer. |
| A. | Stanton |
| B. | Brinkman |
| C. | Rayleigh |
| D. | Nusselt |
| Answer» D. Nusselt | |
| 135. |
The type of pump used for lifting large quantity of sewage is a __________ pump. |
| A. | gear |
| B. | centrifugal |
| C. | reciprocating |
| D. | plunger |
| Answer» C. reciprocating | |
| 136. |
Wrought iron does not have |
| A. | uniform strength in all directions. |
| B. | ability to hold protective coating. |
| C. | high ductility & corrosion resistance. |
| D. | easily weldable characteristics. |
| Answer» B. ability to hold protective coating. | |
| 137. |
Boiling point of water gets lowered at high altitudes (e.g., hills), because |
| A. | temperature is low. |
| B. | atmospheric pressure is low. |
| C. | atmospheric pressure is high. |
| D. | none of these. |
| Answer» C. atmospheric pressure is high. | |
| 138. |
Thermal diffusivity of a refractory brick is high, when its __________ is high. |
| A. | density |
| B. | specific heat |
| C. | thermal conductivity |
| D. | none of these |
| Answer» D. none of these | |
| 139. |
High porosity refractory bricks have |
| A. | poor resistance to the peneration of molten slag, metal & flue gases. |
| B. | poor heat conductivity & low strength. |
| C. | better thermal spalling resistance. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 140. |
Refractories are dried in the |
| A. | rotary kilns |
| B. | tunnel kilns |
| C. | sun |
| D. | none of these |
| Answer» C. sun | |
| 141. |
Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the |
| A. | hearth of the blast furnace. |
| B. | nuclear reactors, missiles & space crafts. |
| C. | insulation of high temperature furnaces. |
| D. | roof of electric furnaces. |
| Answer» C. insulation of high temperature furnaces. | |
| 142. |
Hot metal runner in blast furnace are lined with __________ bricks. |
| A. | silica |
| B. | carborundum |
| C. | fireclay |
| D. | magnesite |
| Answer» D. magnesite | |
| 143. |
Spray test determines the __________ of refractories. |
| A. | resistance to slag penetration |
| B. | resistance to CO attack |
| C. | RUL |
| D. | permanent linear change |
| Answer» B. resistance to CO attack | |
| 144. |
Which one expands on heating ? |
| A. | Silica bricks |
| B. | Fireclay bricks |
| C. | Both (a) & (b) |
| D. | Neither (a) nor (b) |
| Answer» B. Fireclay bricks | |
| 145. |
Refractoriness/fusion points of 'superduty' refractories is __________ C. |
| A. | 1520-1630 |
| B. | 1630-1670 |
| C. | > 1730 |
| D. | > 2000 |
| Answer» D. > 2000 | |
| 146. |
Presence of MgO in alumino-silicate refractories __________ its refractoriness. |
| A. | increases |
| B. | lowers |
| C. | does not affect |
| D. | either (a) or (b); depends on its quantity |
| Answer» C. does not affect | |
| 147. |
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ C. |
| A. | 770 |
| B. | 570 |
| C. | 270 |
| D. | 70 |
| Answer» D. 70 | |
| 148. |
Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks. |
| A. | high duty fireclay |
| B. | silica |
| C. | mullite |
| D. | carborundum |
| Answer» B. silica | |
| 149. |
Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent. |
| A. | 5 |
| B. | 20 |
| C. | 40 |
| D. | 55 |
| Answer» C. 40 | |
| 150. |
Firing temperature is minimum (1250-1400 C) for __________ bricks. |
| A. | fireclay |
| B. | direct bonded basic |
| C. | silica |
| D. | magnesite |
| Answer» B. direct bonded basic | |