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.
| 501. |
Which of the following bearing is preferred for oscillating conditions? |
| A. | Double row roller bearing |
| B. | Taper roller bearing |
| C. | Angular contact single row ball bearing |
| D. | Needle roller bearing |
| Answer» E. | |
| 502. |
In most machine members, the damping capacity of the material should be |
| A. | Low |
| B. | Zero |
| C. | High |
| D. | Could be anything |
| Answer» D. Could be anything | |
| 503. |
Basic shaft is one |
| A. | Whose upper deviation is zero |
| B. | Whose lower deviation is zero |
| C. | Whose lower as well as upper deviations are zero |
| D. | Does not exist |
| Answer» B. Whose lower deviation is zero | |
| 504. |
Gears are casted by |
| A. | Sand mould casting |
| B. | Slush casting |
| C. | Permanent mould casting |
| D. | Centrifugal casting |
| Answer» D. Centrifugal casting | |
| 505. |
The rocker arms in internal combustion engines are of__________. |
| A. | First type levers |
| B. | Second type levers |
| C. | Third type levers |
| D. | None of these |
| Answer» B. Second type levers | |
| 506. |
A steel containing 0.8% carbon is known as |
| A. | Eutectoid steel |
| B. | Hypereutectoid steel |
| C. | Hypo-eutectoid steel |
| D. | None of these |
| Answer» B. Hypereutectoid steel | |
| 507. |
A steel containing up to 0.15% carbon is known as |
| A. | Mild steel |
| B. | Dead mild steel |
| C. | Medium carbon steel |
| D. | High carbon steel |
| Answer» C. Medium carbon steel | |
| 508. |
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is |
| A. | 5 N-m |
| B. | 7 N-m |
| C. | 10 N-m |
| D. | 15 N-m |
| Answer» E. | |
| 509. |
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact) |
| A. | T₁/T₂ = μθ |
| B. | log (T₁/T₂) = μθ |
| C. | T₁/T₂ =eμθ |
| D. | T₁/T₂ = log μθ |
| Answer» D. T₁/T₂ = log μθ | |
| 510. |
The size of a gear is usually specified by |
| A. | Pressure angle |
| B. | Pitch circle diameter |
| C. | Circular pitch |
| D. | Diametral pitch |
| Answer» C. Circular pitch | |
| 511. |
Rivets are generally specified by |
| A. | Thickness of plates to be riveted |
| B. | Length of rivet |
| C. | Diameter of head |
| D. | Nominal diameter |
| Answer» E. | |
| 512. |
The resistance to fatigue of a material is measured by |
| A. | Elastic limit |
| B. | Ultimate tensile strength |
| C. | Young's modulus |
| D. | Endurance limit |
| Answer» E. | |
| 513. |
According to Indian standards, total numbers of fundamental deviations are |
| A. | 10 |
| B. | 15 |
| C. | 20 |
| D. | 25 |
| Answer» E. | |
| 514. |
The objective of idler pulley in belt drive is to |
| A. | Decrease the tendency of belt to slip |
| B. | Increase the power transmission capacity |
| C. | Increase the wrap angle and belt tension |
| D. | All the above objectives |
| Answer» E. | |
| 515. |
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will |
| A. | Have contact at the bottom most of the bearing |
| B. | Move towards right of the bearing making metal to metal contact |
| C. | Move towards right of the bearing making no metal to metal contact |
| D. | Move towards left of the bearing making metal to metal contact |
| Answer» D. Move towards left of the bearing making metal to metal contact | |
| 516. |
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will |
| A. | Have contact at the bottom most of the bearing |
| B. | Move towards right of the bearing making no metal to metal contact |
| C. | Move towards right of the bearing making the metal to metal contact |
| D. | Move towards left of the bearing making metal to metal contact |
| Answer» E. | |
| 517. |
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus. |
| A. | 10 times |
| B. | 5 times |
| C. | 15 times |
| D. | 20 times |
| Answer» D. 20 times | |
| 518. |
A V-belt designated as B 4430 LP has |
| A. | 4430 mm as diameter of small pulley |
| B. | 4430 mm as nominal pitch length |
| C. | 4430 mm as diameter of large pulley |
| D. | 4430 mm as centre distance between pulleys |
| Answer» C. 4430 mm as diameter of large pulley | |
| 519. |
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because |
| A. | Belts are available in sets |
| B. | Only one belt cannot be fitted with other used belts |
| C. | The new belt will carry more than its share and result in short life |
| D. | New and old belts will cause vibrations |
| Answer» D. New and old belts will cause vibrations | |
| 520. |
A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as, |
| A. | Hollow saddle key |
| B. | Hollow key |
| C. | Soft key |
| D. | None of these |
| Answer» B. Hollow key | |
| 521. |
The material generally used for aircraft components is |
| A. | Mild steel |
| B. | High speed steel |
| C. | Stainless steel |
| D. | Aluminium |
| Answer» E. | |
| 522. |
Which of the following has threads at both ends? |
| A. | Bolt |
| B. | Tap bolt |
| C. | Stud |
| D. | None of these |
| Answer» D. None of these | |
| 523. |
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring) |
| A. | (WD/ πd3) × K |
| B. | (2WD/ πd3) × K |
| C. | (4WD/ πd3) × K |
| D. | (8WD/ πd3) × K |
| Answer» E. | |
| 524. |
For tight leakage joints, following type of thread is best suited |
| A. | Metric |
| B. | Buttress |
| C. | Square |
| D. | NPT (national pipe threads). |
| Answer» E. | |
| 525. |
The rolling contact bearings as compared to sliding contact bearings have |
| A. | Low starting and low running friction except at very high speeds |
| B. | Accuracy of shaft alignment |
| C. | Small overall dimensions |
| D. | All of the above |
| Answer» D. All of the above | |
| 526. |
Machine screws are |
| A. | Similar to small size tap bolts except that a greater variety of shapes of heads are available |
| B. | Slotted for a screw driver and generally used with a nut |
| C. | Used to prevent relative motion between two parts |
| D. | Similar to stud |
| Answer» C. Used to prevent relative motion between two parts | |
| 527. |
A woodruff key is |
| A. | A tapered key with head at one end |
| B. | Fitted in pairs at right angles |
| C. | Capable of tilting in a recess milled out in the shaft |
| D. | All of the above |
| Answer» D. All of the above | |
| 528. |
A stud |
| A. | Has a head on one end and a nut fitted to the other |
| B. | Has head at one end and other end fits into a tapped hole in the other part to be joined |
| C. | Has both the ends threaded |
| D. | Has pointed threads |
| Answer» D. Has pointed threads | |
| 529. |
Which one of the following is a positive drive? |
| A. | V-belt drive |
| B. | Rope drive |
| C. | Crossed flat belt drive |
| D. | Chain drive |
| Answer» E. | |
| 530. |
A key way lowers |
| A. | The strength of the shaft |
| B. | The rigidity of the shaft |
| C. | Both the strength and rigidity of the shaft |
| D. | The ductility of the shaft |
| Answer» D. The ductility of the shaft | |
| 531. |
Which of the following cotter joint will be used to connect strap end of a connecting rod? |
| A. | Spigot and socket cotter joint |
| B. | Sleeve and cotter joint |
| C. | Gib and cotter joint |
| D. | Any one of these |
| Answer» D. Any one of these | |
| 532. |
Which of the following statement is wrong for a connecting rod? |
| A. | The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy |
| B. | If Ixx > 4 Iyy, the buckling will occur about Y-axis |
| C. | If Ixx < 4 Iyy, the buckling will occur about X-axis |
| D. | The most suitable section for the connecting rod is T-section |
| Answer» E. | |
| 533. |
Which of the following formula is used in designing a connecting rod? |
| A. | Euler's formula |
| B. | Rankine's formula |
| C. | Johnson's straight line formula |
| D. | Johnson's parabolic formula |
| Answer» C. Johnson's straight line formula | |
| 534. |
The resultant axial load on a bolt depends on |
| A. | Initial tension |
| B. | External load applied |
| C. | Relative elastic yielding (springness) of the bolt and the connected member |
| D. | All of the above |
| Answer» E. | |
| 535. |
A bolt |
| A. | Has a head on one end and a nut fitted to the other |
| B. | Has head at one end and other end fits into a tapped hole in the other part to be joined |
| C. | Has both the ends threaded |
| D. | Is provided with pointed threads |
| Answer» B. Has head at one end and other end fits into a tapped hole in the other part to be joined | |
| 536. |
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon |
| A. | 0.20 to 0.40% |
| B. | 0.35 to 0.45% |
| C. | 0.40 to 0.60% |
| D. | None of these |
| Answer» C. 0.40 to 0.60% | |
| 537. |
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to |
| A. | 0.75/(0.75 + √v) |
| B. | 3/(3 + v) |
| C. | 4.5/(4.5 + v) |
| D. | 6/(6 + v) |
| Answer» C. 4.5/(4.5 + v) | |
| 538. |
A bolt of M 24 × 2 means that |
| A. | The pitch of the thread is 24 mm and depth is 2 mm |
| B. | Cross-sectional area of the threads is 24 mm² |
| C. | The nominal diameter of bolt is 24 mm and pitch is 2 mm |
| D. | The effective diameter of bolt is 24 mm and there are 2 threads per cm |
| Answer» D. The effective diameter of bolt is 24 mm and there are 2 threads per cm | |
| 539. |
The designation M 33 × 2 of a bolt means |
| A. | Metric threads of 33 numbers in 2 cm |
| B. | Metric threads with cross-section of 33 mm |
| C. | Metric threads of 33 mm outside diameter and 2 mm pitch |
| D. | Bolt of 33 mm nominal diameter having 2 threads per cm |
| Answer» D. Bolt of 33 mm nominal diameter having 2 threads per cm | |
| 540. |
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the |
| A. | Carbon content is 2% |
| B. | Maximum compressive strength is 200 N/mm² |
| C. | Minimum tensile strength is 200 N/mm² |
| D. | Maximum shear strength is 200 N/mm² |
| Answer» D. Maximum shear strength is 200 N/mm² | |
| 541. |
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to |
| A. | 0.75/ (0.75 + √v) |
| B. | 3/ (3 + v) |
| C. | 4.5/ (4.5 + v) |
| D. | 6/ (6 + v) |
| Answer» B. 3/ (3 + v) | |
| 542. |
The dedendum circle diameter is equal to (where φ = Pressure angle) |
| A. | Pitch circle diameter × cosφ |
| B. | Addendum circle diameter × cosφ |
| C. | Clearance circle diameter × cosφ |
| D. | Pitch circle diameter × sinφ |
| Answer» B. Addendum circle diameter × cosφ | |
| 543. |
A single strap butt joint is always in __________ shear. |
| A. | Single |
| B. | Double |
| C. | Triple share |
| D. | None of these |
| Answer» B. Double | |
| 544. |
A crankshaft is a __________ shaft. |
| A. | Transmission |
| B. | Machine |
| C. | Machine frame |
| D. | None of these |
| Answer» C. Machine frame | |
| 545. |
The V-belts are particularly suitable for __________ drives. |
| A. | Short |
| B. | Long |
| C. | Both A and B |
| D. | None of these |
| Answer» B. Long | |
| 546. |
The expansion joint is mostly used for pipes which carry steam at __________ pressures. |
| A. | Low |
| B. | High |
| C. | Medium |
| D. | None of these |
| Answer» C. Medium | |
| 547. |
A riveted joint is a __________ fastening. |
| A. | Permanent |
| B. | Temporary |
| C. | Either A or B |
| D. | None of these |
| Answer» B. Temporary | |
| 548. |
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B. |
| A. | Twice |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» D. Sixteen times | |
| 549. |
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle. |
| A. | Larger than |
| B. | Smaller than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 550. |
18/8 steel contains |
| A. | 18% nickel and 8% chromium |
| B. | 18% chromium and 8% nickel |
| C. | 18% nickel and 8% vanadium |
| D. | 18% vanadium and 8% nickel |
| Answer» C. 18% nickel and 8% vanadium | |