MCQOPTIONS
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MCQOPTIONS
This section includes 991 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
A hollow saddle key is |
| A. | A taper key which fits half in the key way of hub and half in the key way of shaft |
| B. | A taper key which fits in a key way of the hub and is flat on the shaft |
| C. | A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft |
| D. | Provided in pairs at right angles and each key is to withstand torsion in one direction only |
| Answer» D. Provided in pairs at right angles and each key is to withstand torsion in one direction only | |
| 302. |
The property of a material which enables it to resist fracture due to high impact loads is known as |
| A. | Elasticity |
| B. | Endurance |
| C. | Strength |
| D. | Toughness |
| Answer» E. | |
| 303. |
Fabric belts are used in industrial applications because |
| A. | They are cheap |
| B. | They can work at high temperature |
| C. | They are unaffected by moisture and humidity |
| D. | None of the above |
| Answer» B. They can work at high temperature | |
| 304. |
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be |
| A. | 45 to 60% |
| B. | 63 to 70% |
| C. | 70 to 83% |
| D. | 80 to 90% |
| Answer» E. | |
| 305. |
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited |
| A. | Square |
| B. | Acme |
| C. | Buttress |
| D. | BSW |
| Answer» D. BSW | |
| 306. |
For applications involving high stresses in one direction only the following type of thread would be best suited |
| A. | ISO metric thread |
| B. | Acme thread |
| C. | Square thread |
| D. | Buttress thread |
| Answer» E. | |
| 307. |
Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment? |
| A. | Bushed pin type coupling |
| B. | Universal coupling |
| C. | Oldham coupling |
| D. | All of these |
| Answer» E. | |
| 308. |
In a marine flange coupling, the thickness of flange is taken as |
| A. | d/2 |
| B. | d/3 |
| C. | 3d/4 |
| D. | d/4 |
| Answer» C. 3d/4 | |
| 309. |
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be |
| A. | 45 to 60% |
| B. | 63 to 70% |
| C. | 70 to 83% |
| D. | 80 to 90% |
| Answer» D. 80 to 90% | |
| 310. |
An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called |
| A. | Addendum circle |
| B. | Dedendum circle |
| C. | Pitch circle |
| D. | Clearance circle |
| Answer» D. Clearance circle | |
| 311. |
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to |
| A. | Increase the key length |
| B. | Increase the key depth |
| C. | Increase the key width |
| D. | Decrease the key length |
| Answer» B. Increase the key depth | |
| 312. |
When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the |
| A. | Initial tension |
| B. | External load applied |
| C. | Sum of the initial tension and external load applied |
| D. | Initial tension or external load, whichever is greater |
| Answer» E. | |
| 313. |
When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the |
| A. | Initial tension |
| B. | External load applied |
| C. | Sum of the initial tension and external load applied |
| D. | Initial tension or external load, whichever is greater |
| Answer» D. Initial tension or external load, whichever is greater | |
| 314. |
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing |
| A. | Remains constant at all speeds |
| B. | Is minimum at zero speed and increases monotonically with increase in speed |
| C. | Is maximum at zero speed and decreases monotonically with increase in speed |
| D. | Becomes minimum at an optimum speed and then increases with further increase in speed |
| Answer» E. | |
| 315. |
The strength of a riveted joint is equal to |
| A. | Tearing strength of plate (Pt) |
| B. | Shearing strength of rivet (Ps) |
| C. | Crushing strength of rivet (Pc) |
| D. | Least value of Pt Ps and Pc |
| Answer» E. | |
| 316. |
The efficiency of a riveted joint is equal to |
| A. | Pt /P |
| B. | Ps /P |
| C. | Pc /P |
| D. | Least of Pt, Ps and Pc/P |
| Answer» E. | |
| 317. |
The included angle for the British standard whitworth thread is |
| A. | 29° |
| B. | 47.5° |
| C. | 55° |
| D. | 60° |
| Answer» D. 60° | |
| 318. |
A screw is said to be a self locking screw, if its efficiency is |
| A. | Less than 50% |
| B. | More than 50% |
| C. | Equal to 50% |
| D. | None of these |
| Answer» B. More than 50% | |
| 319. |
A screw is said to be over hauling screw, if its efficiency is |
| A. | More than 50% |
| B. | Less than 50% |
| C. | Equal to 50% |
| D. | None of these |
| Answer» B. Less than 50% | |
| 320. |
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be |
| A. | εc + 2εl |
| B. | 2εc + εl |
| C. | εc + εl² |
| D. | εc² + εl |
| Answer» C. εc + εl² | |
| 321. |
The face angle of a bevel gear is equal to |
| A. | Pitch angle - addendum angle |
| B. | Pitch angle + addendum angle |
| C. | Pitch angle - dedendum angle |
| D. | Pitch angle + dedendum angle |
| Answer» C. Pitch angle - dedendum angle | |
| 322. |
The root angle of a bevel gear is equal to |
| A. | Pitch angle - addendum angle |
| B. | Pitch angle + addendum angle |
| C. | Pitch angle - dedendum angle |
| D. | Pitch angle + dedendum angle |
| Answer» D. Pitch angle + dedendum angle | |
| 323. |
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called |
| A. | Plasticity |
| B. | Elasticity |
| C. | Ductility |
| D. | Malleability |
| Answer» D. Malleability | |
| 324. |
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be |
| A. | Knuckle threads |
| B. | Square threads |
| C. | Acme threads |
| D. | Buttress threads |
| Answer» E. | |
| 325. |
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is |
| A. | 2000 N-m |
| B. | 2050 N-m |
| C. | 2100 N-m |
| D. | 2136 N-m |
| Answer» E. | |
| 326. |
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test |
| A. | Brinell |
| B. | Rockwell |
| C. | Vickers |
| D. | None of the above |
| Answer» B. Rockwell | |
| 327. |
In designing a connecting rod, it is considered like __________ for buckling about Y-axis. |
| A. | Both ends hinged |
| B. | Both ends fixed |
| C. | One end fixed and the other end hinged |
| D. | One end fixed and the other end free |
| Answer» C. One end fixed and the other end hinged | |
| 328. |
In designing a connecting rod, it is considered like __________ for buckling about X-axis. |
| A. | Both ends hinged |
| B. | Both ends fixed |
| C. | One end fixed and the other end hinged |
| D. | One end fixed and the other end free |
| Answer» B. Both ends fixed | |
| 329. |
The spring mostly used in gramophones is |
| A. | Helical spring |
| B. | Conical spring |
| C. | Flat spiral spring |
| D. | Volute spring |
| Answer» D. Volute spring | |
| 330. |
Creep in belt is due to |
| A. | Material of the belt |
| B. | Material of the pulley |
| C. | Uneven extensions and contractions due to varying tension |
| D. | All of the above |
| Answer» D. All of the above | |
| 331. |
The surface finish factor for a mirror polished material is |
| A. | 0.45 |
| B. | 0.65 |
| C. | 0.85 |
| D. | 1 |
| Answer» E. | |
| 332. |
In the levers of __________ type, the mechanical advantage is less than one. |
| A. | First |
| B. | Second |
| C. | Third |
| D. | None of these |
| Answer» D. None of these | |
| 333. |
A backing ring is used inside the pipe joint when making a |
| A. | Butt weld |
| B. | Fillet weld |
| C. | Sleeve weld |
| D. | Socket weld |
| Answer» B. Fillet weld | |
| 334. |
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is |
| A. | 3.6 N/mm² compression |
| B. | 3.6 N/mm² tension |
| C. | 7.2 N/mm² compression |
| D. | 7.2 N/mm² tension |
| Answer» D. 7.2 N/mm² tension | |
| 335. |
Deep groove ball bearings are used for |
| A. | Heavy thrust load only |
| B. | Small angular displacement of shafts |
| C. | Radial load at high speed |
| D. | Combined thrust and radial loads at high speed |
| Answer» E. | |
| 336. |
The rolling contact bearings are known as |
| A. | Thick lubricated bearings |
| B. | Plastic bearings |
| C. | Antifriction bearings |
| D. | Thin lubricated bearings |
| Answer» D. Thin lubricated bearings | |
| 337. |
When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads |
| A. | Compression |
| B. | Tension |
| C. | Shear |
| D. | Combined loads |
| Answer» C. Shear | |
| 338. |
A screw is said to be over hauling screw, if the |
| A. | Friction angle is less than helix angle |
| B. | Friction angle is more than helix angle |
| C. | Friction angle is equal to helix angle |
| D. | Efficiency of screw is 100% |
| Answer» B. Friction angle is more than helix angle | |
| 339. |
A connecting rod should be |
| A. | Strong in buckling about X-axis |
| B. | Strong in buckling about Y-axis |
| C. | Equally strong in buckling about X-axis and Y-axis |
| D. | Any one of the above |
| Answer» D. Any one of the above | |
| 340. |
A locking device extensively used in marine type connecting rod ends is a |
| A. | Jam nut |
| B. | Castle nut |
| C. | Sawn nut |
| D. | Ring nut |
| Answer» E. | |
| 341. |
Which of the following statement is correct regarding power screws? |
| A. | The efficiency of a self locking screw can not be more than 50% |
| B. | The efficiency of Acme (trapezoidal) thread is less than that of a square thread |
| C. | If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% |
| D. | Both (A) and (B) |
| Answer» E. | |
| 342. |
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using |
| A. | Gerber relation |
| B. | Soderberg relation |
| C. | Goodman relation |
| D. | None of these |
| Answer» D. None of these | |
| 343. |
A locking device extensively used in automobile industry is a |
| A. | Jam nut |
| B. | Castle nut |
| C. | Sawn nut |
| D. | Ring nut |
| Answer» C. Sawn nut | |
| 344. |
The piston pin bearings in heavy duty diesel engines are |
| A. | Needle roller bearings |
| B. | Tapered roller bearings |
| C. | Spherical roller bearings |
| D. | Cylindrical roller bearings |
| Answer» B. Tapered roller bearings | |
| 345. |
Form coefficient of spring is |
| A. | Ratio of coil diameter to wire diameter |
| B. | Load required to produce unit deflection |
| C. | Its capability of storing energy |
| D. | Concerned with strength of wire of spring |
| Answer» D. Concerned with strength of wire of spring | |
| 346. |
The material used for brake lining should have __________ coefficient of friction. |
| A. | Low |
| B. | High |
| C. | Moderate |
| D. | None of these |
| Answer» C. Moderate | |
| 347. |
The width of the pulley should be __________ width of the belt. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» D. None of these | |
| 348. |
The included angle between the sides of V-belt is |
| A. | 40° |
| B. | 45° |
| C. | 38° |
| D. | 60° |
| Answer» B. 45° | |
| 349. |
Taper usually provided on cotter is |
| A. | 1 in 5 |
| B. | 1 in 10 |
| C. | 1 in 24 |
| D. | 1 in 40 |
| Answer» D. 1 in 40 | |
| 350. |
The plasticity is the property of a material which enables it to |
| A. | Regain its original shape after deformation when the external forces are removed |
| B. | Draw into wires by the application of a tensile force |
| C. | Resist fracture due to high impact loads |
| D. | Retain deformation produced under load permanently |
| Answer» E. | |