MCQOPTIONS
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MCQOPTIONS
This section includes 538 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. |
In comparison with a radial tyre, one advantage of a bias ply tyre is |
| A. | onger life |
| B. | ower rolling resistance |
| C. | moother ride at low speeds |
| D. | one of these |
| Answer» D. one of these | |
| 102. |
The compression ratio of a petrol engine is nearly |
| A. | :1 |
| B. | :1 |
| C. | 5:1 |
| D. | 0:1 |
| Answer» C. 5:1 | |
| 103. |
Damper is also known as |
| A. | hock absorber |
| B. | orsion bar |
| C. | pring |
| D. | adius rod |
| Answer» B. orsion bar | |
| 104. |
The main cause for the change in engine oil viscosity is |
| A. | umidity |
| B. | emperature |
| C. | ibration |
| D. | ontamination |
| Answer» C. ibration | |
| 105. |
One effect of detonation is |
| A. | elay in ignition |
| B. | oss of power |
| C. | verheating of engine |
| D. | vercooling of engine |
| Answer» C. verheating of engine | |
| 106. |
Which of the following indicates multi-grade oil? |
| A. | AE 30 |
| B. | PI SF |
| C. | AE20 W50 |
| D. | PI 50 |
| Answer» D. PI 50 | |
| 107. |
The function of oil control rings is that it |
| A. | ubricates the cylinder wall by releasing oil from its hole |
| B. | eeps the cylinder wall lubricated by holding oil in its channel |
| C. | revents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan |
| D. | aintains a seal and prevents escape of burned gases and oil leakage |
| Answer» D. aintains a seal and prevents escape of burned gases and oil leakage | |
| 108. |
The function of a first compression ring (top ring) is that it |
| A. | ncreases the combustion temperature |
| B. | reates swirl |
| C. | aintains a seal and prevents the fuel leakage |
| D. | aintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber |
| Answer» E. | |
| 109. |
The torque converter uses ________ to transfer torque. |
| A. | ir |
| B. | utomatic transmission fluid (ATF) |
| C. | ears |
| D. | teel belt |
| Answer» C. ears | |
| 110. |
The forced fed lubrication system means that the oil is delivered to the engine by |
| A. | ravity |
| B. | he pressure created by the oil pump |
| C. | plashing action of the crankshaft |
| D. | one of these |
| Answer» C. plashing action of the crankshaft | |
| 111. |
In a four speed four stroke Diesel engine, the intake valve |
| A. | pens at T.D.C. and closes at B.D.C. |
| B. | pens at 20° before T.D.C. and closes at 35° after B.D.C. |
| C. | pens at 10° after T.D.C. and closes at 20° before B.D.C. |
| D. | one of the above |
| Answer» C. pens at 10° after T.D.C. and closes at 20° before B.D.C. | |
| 112. |
The main characteristics of a maintenance free (MF) battery is that |
| A. | maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid |
| B. | maintenance free battery has a relatively short shelf life when compared with standard batteries |
| C. | ince it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water |
| D. | echarging of a maintenance free battery is neither required nor possible |
| Answer» D. echarging of a maintenance free battery is neither required nor possible | |
| 113. |
When indicated power (I.P.) and frictional power (F.P.) are known, we can calculate |
| A. | rake power |
| B. | ompression ratio |
| C. | pecific air consumption |
| D. | ean effective pressure |
| Answer» B. ompression ratio | |
| 114. |
Tachometer in a vehicle measures |
| A. | peed |
| B. | istance |
| C. | ngine r.p.m. |
| D. | uel consumption |
| Answer» D. uel consumption | |
| 115. |
Caster is a |
| A. | orward tilt of the kingpin |
| B. | ackward tilt of the kingpin |
| C. | ither 'A' or 'B' |
| D. | one of these |
| Answer» D. one of these | |
| 116. |
The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as |
| A. | leaning |
| B. | riming |
| C. | cavenging |
| D. | etonation |
| Answer» D. etonation | |
| 117. |
A battery can be charged by |
| A. | dding distilled water |
| B. | dding sulphuric acid |
| C. | pplying voltage in the reverse direction to that of charging |
| D. | pplying a voltage in the same direction to that of charging |
| Answer» D. pplying a voltage in the same direction to that of charging | |
| 118. |
The parking brake generally acts on |
| A. | ront wheels |
| B. | ear wheels |
| C. | ront and rear wheels |
| D. | ropeller shaft |
| Answer» C. ront and rear wheels | |
| 119. |
The starting system includes |
| A. | battery, a starter, and an ignition switch |
| B. | battery, a distributor, and an ignition switch |
| C. | battery, a starter, and a distributor |
| D. | distributor, a starter, and an ignition switch |
| Answer» B. battery, a distributor, and an ignition switch | |
| 120. |
The function of a second ring is that it is a |
| A. | ack up compression ring which will work in place of the top ring when it is broken |
| B. | ompression ring and aids the top ring in sealing and cooling |
| C. | ack up oil control ring which will work in place of the bottom ring when it is broken |
| D. | ushion ring which prevents piston slap and knock |
| Answer» C. ack up oil control ring which will work in place of the bottom ring when it is broken | |
| 121. |
The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power) |
| A. | .P/B.P. |
| B. | .P/I.P. |
| C. | .P/F.P. |
| D. | .P/B.P. |
| Answer» C. .P/F.P. | |
| 122. |
The main function of the brake fluid is |
| A. | ubrication |
| B. | ower transmission |
| C. | ooling |
| D. | one of these |
| Answer» C. ooling | |
| 123. |
The discharged lead acid battery has on its plates |
| A. | ead peroxide (PbO₂) |
| B. | pongy lead (Pb) |
| C. | ead sulphate (PbSO₄) |
| D. | ulphuric acid (H₂SO₄) |
| Answer» D. ulphuric acid (H₂SO₄) | |
| 124. |
In Diesel engines, the duration between the time of injection and the time of ignition is called |
| A. | pill cut-off |
| B. | elay period |
| C. | njection period |
| D. | gnition period |
| Answer» C. njection period | |
| 125. |
The purpose of a cylinder head gasket is to |
| A. | revent the combustion gases from leaking from the joint between the cylinder block and the cylinder head |
| B. | revent engine oil from going into combustion chamber |
| C. | emoves impurities from cylinder head lubricating oil |
| D. | one of the above |
| Answer» B. revent engine oil from going into combustion chamber | |
| 126. |
The temperature indicating instrument in vehicles indicates the temperature of |
| A. | ngine piston |
| B. | ngine cylinder |
| C. | ubricating oil |
| D. | acket cooling water |
| Answer» E. | |
| 127. |
Which of the following bulb in a car will have the least wattage? |
| A. | ead light bulb |
| B. | top light bulb |
| C. | arking light bulb |
| D. | gnition warning bulb |
| Answer» E. | |
| 128. |
The order in which effort applied to the steering wheel is transferred to the front wheel is |
| A. | teering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels |
| B. | teering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels |
| C. | teering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels |
| D. | teering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels |
| Answer» C. teering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels | |
| 129. |
The gear shift lever requires two separate motions to shift gears, and the first movement |
| A. | oves the synchronizer |
| B. | elects the synchronizer |
| C. | eshes the gears |
| D. | perates the clutch |
| Answer» C. eshes the gears | |
| 130. |
The rolling resistance is because of the friction between the |
| A. | heel rim and tyre |
| B. | yre and the road surface |
| C. | heel rim and road surface |
| D. | one of these |
| Answer» C. heel rim and road surface | |
| 131. |
The function of a connecting rod is |
| A. | o turn the flywheel |
| B. | o drive the drive plate |
| C. | o drive the fuel pump |
| D. | o transmit motion of the piston to the crankshaft |
| Answer» E. | |
| 132. |
Free pedal play in car clutches is about |
| A. | 5 mm |
| B. | 5 mm |
| C. | 0 mm |
| D. | 0 mm |
| Answer» C. 0 mm | |
| 133. |
The parking brakes employed in vehicles are operated |
| A. | echanically |
| B. | ydraulically |
| C. | neumatically |
| D. | one of these |
| Answer» B. ydraulically | |
| 134. |
The combustion process in a Diesel engine is a |
| A. | onstant volume process |
| B. | onstant pressure process |
| C. | onstant temperature process |
| D. | diabatic process |
| Answer» C. onstant temperature process | |
| 135. |
The damper fluid leakage typically occur from |
| A. | pper damper mounting |
| B. | ottom of damper |
| C. | learance between inner and outer tubes of damper |
| D. | oil spring mounting |
| Answer» D. oil spring mounting | |
| 136. |
The major purpose of an electronically controlled automatic transmission is that this type of transmission |
| A. | liminates gear clutches |
| B. | liminates the gear shaft lever |
| C. | educes the number of automatic transmission components |
| D. | educes shift shock and achieves more efficient transmission of engine torque |
| Answer» E. | |
| 137. |
The engine oil is stored in _________ when the engine is not running. |
| A. | il pan |
| B. | ylinder head |
| C. | il pump |
| D. | eparate oil tank |
| Answer» B. ylinder head | |
| 138. |
For the same maximum pressure and temperature |
| A. | iesel cycle is more efficient than Otto cycle |
| B. | tto cycle is more efficient than Diesel cycle |
| C. | oth Otto cycle and Diesel cycle are equally efficient |
| D. | one of the above |
| Answer» B. tto cycle is more efficient than Diesel cycle | |
| 139. |
A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is |
| A. | .091 Nm |
| B. | 0.91 Nm |
| C. | 09.1 Nm |
| D. | 091 Nm |
| Answer» D. 091 Nm | |
| 140. |
Clutch facings are usually attached to the plate by |
| A. | teel rivets |
| B. | rass rivets |
| C. | luminium screws |
| D. | teel screws |
| Answer» C. luminium screws | |
| 141. |
The size of engine cylinder is referred in terms of its |
| A. | iameter and bore |
| B. | isplacement and efficiency |
| C. | ore and stroke |
| D. | ore and length |
| Answer» D. ore and length | |
| 142. |
The instrument used to check specific gravity of acid in a battery is |
| A. | ydrometer |
| B. | ygrometer |
| C. | nemometer |
| D. | ultimeter |
| Answer» B. ygrometer | |
| 143. |
The composition of the electrolyte in a fully charged battery is that |
| A. | he electrolyte is pure distilled water |
| B. | he electrolyte is pure sulphuric acid |
| C. | he electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight |
| D. | he electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight |
| Answer» D. he electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight | |
| 144. |
The service brakes employed in cars are generally operated |
| A. | echanically |
| B. | ydraulically |
| C. | neumatically |
| D. | one of these |
| Answer» C. neumatically | |
| 145. |
In a Diesel engine, the function of a fuel injector is to |
| A. | ix the fuel and air |
| B. | gnite the air-fuel mixture |
| C. | rovide flame front for ignition |
| D. | pray atomized fuel in the cylinder |
| Answer» E. | |
| 146. |
An overinflated tyre will wear the tread most near the |
| A. | dges |
| B. | orners |
| C. | entre |
| D. | one of these |
| Answer» D. one of these | |
| 147. |
Instead of valves, the ports are used in case of |
| A. | our stroke I.C. engines |
| B. | wo stroke I.C. engines |
| C. | 6 engines |
| D. | one of these |
| Answer» C. 6 engines | |
| 148. |
The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is |
| A. | .143 N |
| B. | 1.43 N |
| C. | 14.3 N |
| D. | 143 N |
| Answer» E. | |
| 149. |
The firing order for an opposed four cylinder l.C. engine is |
| A. | -2-3-4 |
| B. | -3-4-2 |
| C. | -4-3-2 |
| D. | -3-2-4 |
| Answer» D. -3-2-4 | |
| 150. |
The firing order for an inline four cylinder I.C. engine is |
| A. | -2-3-4 |
| B. | -3-4-2 |
| C. | -2-4-3 |
| D. | -3-2-4 |
| Answer» C. -2-4-3 | |