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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.
| 2151. |
The superheated vapour region, in a pressure enthalpy chart, is represented by the space |
| A. | to the left of saturated liquid line |
| B. | to the right of saturated liquid line |
| C. | between the saturated liquid line and saturated vapour line |
| D. | none of the above |
| Answer» D. none of the above | |
| 2152. |
The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as |
| A. | mean radiant temperature |
| B. | effective temperature |
| C. | dew point temperature |
| D. | none of these |
| Answer» C. dew point temperature | |
| 2153. |
The rato of energy transferred by convection to that by conduction is called |
| A. | Stanton number |
| B. | Nusselt number |
| C. | Biot number |
| D. | Peclet number |
| Answer» C. Biot number | |
| 2154. |
A thermostatic expansion valve in a refrigeration system |
| A. | ensures the evaporator completely filled with refrigerant of the load |
| B. | is suitable only for constant load systems |
| C. | maintains different temperatures in evaporator in proportion to load |
| D. | none of the above |
| Answer» B. is suitable only for constant load systems | |
| 2155. |
The specific humidity during heating and humidification process. |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| Answer» C. decreases | |
| 2156. |
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in |
| A. | parallel flow |
| B. | counter flow |
| C. | cross flow |
| D. | all of these |
| Answer» E. | |
| 2157. |
The humidification process, on the psychrometric chart is shown by |
| A. | horizontal line |
| B. | vertical line |
| C. | inclined line |
| D. | curved line |
| Answer» C. inclined line | |
| 2158. |
A device used for transfering heat from one fluid to another is called heat exchanger. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2159. |
In a vapour compression system, the condition of refrigerant before passing through the condenser is |
| A. | saturated liquid |
| B. | wet vapour |
| C. | dry saturated vapour |
| D. | superheated vapour |
| Answer» E. | |
| 2160. |
The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat. |
| A. | good |
| B. | bad |
| Answer» C. | |
| 2161. |
The dehumidification process, on the psychrometric chart, is shown by |
| A. | horizontal Sine |
| B. | vertical line |
| C. | inclined line |
| D. | curved line |
| Answer» C. inclined line | |
| 2162. |
The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature. |
| A. | same as |
| B. | lower than |
| C. | higher than |
| Answer» B. lower than | |
| 2163. |
Most air cooled condensers are designed to operate with a temperature difference of |
| A. | 5 C |
| B. | 8 C |
| C. | 14 C |
| D. | 22 C |
| Answer» D. 22 C | |
| 2164. |
A condenser is used in the __________ pressure side of a refrigerating system. |
| A. | low |
| B. | high |
| Answer» C. | |
| 2165. |
The three basic cylinder arrangements for automotive engines are |
| A. | flat, radial, and V |
| B. | in a row, in line, and opposed |
| C. | in line, V, and opposed |
| D. | V, double row, and opposed |
| Answer» D. V, double row, and opposed | |
| 2166. |
The main purpose of an engine's air cleaner is that it |
| A. | controls the engine's air intake volume |
| B. | reduces the engine's air intake noise |
| C. | prevents rain water from entering the engine |
| D. | prevents dust and other foreign matter from entering the engine |
| Answer» E. | |
| 2167. |
The maximum torque multiplication ratio in a torque converter is about |
| A. | 2.5 |
| B. | 10 |
| C. | 25 |
| D. | 40 |
| Answer» B. 10 | |
| 2168. |
The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10 is |
| A. | 1.6694 N |
| B. | 16.694 N |
| C. | 166.94 N |
| D. | 1669.4 N |
| Answer» E. | |
| 2169. |
The starting system includes |
| A. | a battery, a starter, and an ignition switch |
| B. | a battery, a distributor, and an ignition switch |
| C. | a battery, a starter, and a distributor |
| D. | a distributor, a starter, and an ignition switch |
| Answer» B. a battery, a distributor, and an ignition switch | |
| 2170. |
A front stabilizer bar is used to |
| A. | increase vehicle load-carrying capacity |
| B. | provide a softer ride |
| C. | control suspension movement and body roll |
| D. | all of the above |
| Answer» D. all of the above | |
| 2171. |
When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate |
| A. | brake power |
| B. | compression ratio |
| C. | specific air consumption |
| D. | mean effective pressure |
| Answer» B. compression ratio | |
| 2172. |
The best fuels for compression ignition engines are |
| A. | straight chain paraffins |
| B. | aromatics |
| C. | branched chain paraffins |
| D. | napthalenes |
| Answer» E. | |
| 2173. |
The most accurate ignition system of a spark ignition engine is |
| A. | magneto system |
| B. | battery system |
| C. | electronic control unit system |
| D. | magneto and electronic system |
| Answer» D. magneto and electronic system | |
| 2174. |
The engine's idling speed will increase by a slight degree immediately after a cold engine has been started. It will drop as the engine warms up. and it will eventually reach the standard level. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2175. |
The commonly used antifreeze solution in automobiles is |
| A. | carbon disulphide |
| B. | ethylene glycol |
| C. | ammonium chloride |
| D. | freon-12 |
| Answer» C. ammonium chloride | |
| 2176. |
Wheel base of a vehicle is the |
| A. | distance between the centres of the front and rear wheels |
| B. | distance between the centres of the front tyres |
| C. | distance between the centres of the rear tyres |
| D. | extreme length of the vehicle |
| Answer» B. distance between the centres of the front tyres | |
| 2177. |
Bead wires are made of |
| A. | steel |
| B. | copper |
| C. | zinc |
| D. | aluminium |
| Answer» B. copper | |
| 2178. |
When a closely-coiled helical spring is subjected to an axial load, it is said to be under |
| A. | bending |
| B. | shear |
| C. | torsion |
| D. | crushing |
| Answer» D. crushing | |
| 2179. |
The given figure shows the Mohr's circle of stress for two unequal and like principal stresses ( x and y) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle with the minor principle plane is given by |
| A. | <i>OC</i> |
| B. | <i>OP</i> |
| C. | <i>OQ</i> |
| D. | <i>PQ</i> |
| Answer» D. <i>PQ</i> | |
| 2180. |
The unit of modulus of elasticity is same as those of |
| A. | stress, strain and pressure |
| B. | stress, force and modulus of rigidity |
| C. | strain, force and pressure |
| D. | stress, pressure and modulus of rigidity |
| Answer» E. | |
| 2181. |
For the two shafts connected in parallel and subjected to twisting moment, the angle of twist of each shaft will be same. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2182. |
Poisson's ratio is the ratio of linear stein to the volumetric strain. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2183. |
The bending moment at the free end of a cantilever beam is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| Answer» B. minimum | |
| 2184. |
The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called |
| A. | compressive stress |
| B. | shear stress |
| C. | bending stress |
| D. | elastic modulus |
| Answer» D. elastic modulus | |
| 2185. |
The horizontal thrust offered by the retaining wall on the retained material is (where w = Specific weight of the retained material, h = height of retaining wall, and ( ) = Angle of repose of the retained earth) |
| A. | <img src="/_files/images/mechanical-engineering/strength-of-materials/124-439-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/strength-of-materials/124-439-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/strength-of-materials/124-439-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/strength-of-materials/124-439-4.png"> |
| Answer» C. <img src="/_files/images/mechanical-engineering/strength-of-materials/124-439-3.png"> | |
| 2186. |
The lower layer of the beam as shown in the below figure, will be |
| A. | in tension |
| B. | in compression |
| C. | neither in tension nor in compression |
| Answer» B. in compression | |
| 2187. |
If percentage elongation of a certain specimen made of a material 'A' under tensile test is 30% and the percentage elongation of a specimen with same dimensions made of another material 'B' is 40%, then material 'B' is more ductile than material 'A'. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 2188. |
In order to completely specify angular displacement by a vector, it must fix |
| A. | direction of the axis of rotation |
| B. | magnitude of angular displacement |
| C. | sense of angular displacement |
| D. | all of these |
| Answer» E. | |
| 2189. |
The centre of gravity a T-section 100 mm x 150 mm x 50 mm from its bottom is |
| A. | 50mm |
| B. | 75mm |
| C. | 87.5mm |
| D. | 125mm |
| Answer» D. 125mm | |
| 2190. |
The length of a conical bar is l, diameter of base is d and weight per unit volume is w. It is fixea at its upper end and hanging freely. The elongation of the bar under the action of its own weight will be |
| A. | <img src="/_files/images/mechanical-engineering/strength-of-materials/84-24-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/strength-of-materials/84-24-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/strength-of-materials/84-24-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/strength-of-materials/84-24-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/strength-of-materials/84-24-4.png"> | |
| 2191. |
Which of the following statement is correct in connection with projectiles? |
| A. | A path, traced by a projectile in the space, is known as trajectory. |
| B. | The velocity with which a projectile is projected, is known as the velocity of projection. |
| C. | The angle, with the horizontal, at which a projectile is projected is known as angle of projection. |
| D. | all of the above |
| Answer» E. | |
| 2192. |
Moment of inertia is the |
| A. | second moment of force |
| B. | second moment of area |
| C. | second moment of mass |
| D. | all of these |
| Answer» E. | |
| 2193. |
The coefficient of restitution for inelastic bodies is |
| A. | zero |
| B. | one |
| C. | between zero and one |
| D. | more than one |
| Answer» B. one | |
| 2194. |
When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ proportional to its acceleration. |
| A. | directly |
| B. | inversely |
| Answer» B. inversely | |
| 2195. |
The term 'centroid' is |
| A. | the same as centre of gravity |
| B. | the point of suspension |
| C. | the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis |
| D. | none of the above |
| Answer» B. the point of suspension | |
| 2196. |
The impact between two lead spheres is approximately equal to an __________ impact. |
| A. | elastic |
| B. | inelastic |
| Answer» C. | |
| 2197. |
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base. |
| A. | nine times |
| B. | six times |
| C. | four times |
| D. | two times |
| Answer» B. six times | |
| 2198. |
If a body is thrown upwards, then the gravitational acceleration is taken as zero. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 2199. |
The horizontal range of a projectile (R) is given by |
| A. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/42-220-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/42-220-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/42-220-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/42-220-4.png"> |
| Answer» C. <img src="/_files/images/mechanical-engineering/engineering-mechanics/42-220-3.png"> | |
| 2200. |
A machine having an efficiency greater than 50%, is known as |
| A. | reversible machine |
| B. | non-reversible machine |
| C. | neither reversible nor non-reversible machine |
| D. | ideal machine |
| Answer» B. non-reversible machine | |