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.
| 401. |
The constant factor in case of R10 series of preferred numbers is |
| A. | 1.06 |
| B. | 1.12 |
| C. | 1.26 |
| D. | 1.58 |
| Answer» D. 1.58 | |
| 402. |
The longitudinal stress is __________ of the circumferential stress. |
| A. | One-half |
| B. | Two-third |
| C. | Three-fourth |
| D. | Double |
| Answer» B. Two-third | |
| 403. |
A bolt is designed on the basis of __________ with a large factor of safety. |
| A. | Direct tensile stress |
| B. | Direct compressive stress |
| C. | Direct bending stress |
| D. | Direct shear stress |
| Answer» B. Direct compressive stress | |
| 404. |
For unequal width of butt straps, the thicknesses of butt straps are |
| A. | 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside |
| B. | 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside |
| C. | 0.75 t for both the straps on the inside and outside |
| D. | 0.625 t for both the straps on the inside and outside |
| Answer» C. 0.75 t for both the straps on the inside and outside | |
| 405. |
When the speed of belt increases, |
| A. | The coefficient of friction between the belt and pulley decreases |
| B. | The coefficient of friction between the belt and pulley increases |
| C. | The power transmitted will decrease |
| D. | The power transmitted will increase |
| Answer» D. The power transmitted will increase | |
| 406. |
The groove angle of pulleys for V-belt is |
| A. | 340 to 360 |
| B. | 420 to 450 |
| C. | More than 400 |
| D. | 300 to 320 |
| Answer» B. 420 to 450 | |
| 407. |
In the assembly of pulley, key and shaft |
| A. | Pulley is made the weakest |
| B. | Key is made the weakest |
| C. | Key is made the strongest |
| D. | All the three are designed for equal strength |
| Answer» C. Key is made the strongest | |
| 408. |
In composite or reverse laid ropes |
| A. | Direction of twist of wires in strands is opposite to the direction of twist of strands |
| B. | Direction of twist of wires and strands are same |
| C. | Wires in two adjacent strands are twisted in opposite direction |
| D. | Wires are not twisted |
| Answer» D. Wires are not twisted | |
| 409. |
The application of second type levers is found in |
| A. | Handle of a hand pump |
| B. | Hand wheel of a punching press |
| C. | Lever of a loaded safety valve |
| D. | A pair of tongs |
| Answer» D. A pair of tongs | |
| 410. |
The application of third type levers is found in |
| A. | A pair of tongs |
| B. | Hand wheel of a punching press |
| C. | Lever of a loaded safety valve |
| D. | Handle of a hand pump |
| Answer» B. Hand wheel of a punching press | |
| 411. |
A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 412. |
In a flange coupling, the flanges are coupled together by means of |
| A. | Bolts and nuts |
| B. | Studs |
| C. | Headless taper bolts |
| D. | None of these |
| Answer» B. Studs | |
| 413. |
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as |
| A. | T sec³φ |
| B. | T sec²φ |
| C. | T/sec³φ |
| D. | T cosecφ |
| Answer» B. T sec²φ | |
| 414. |
The groove angle of the pulley for rope drive is usually |
| A. | 20° |
| B. | 35° |
| C. | 45° |
| D. | 60° |
| Answer» D. 60° | |
| 415. |
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If V is the storage capacity of shell, then its diameter will be |
| A. | (6V/ π)1/2 |
| B. | (6V/ π)1/3 |
| C. | (6V/ π)2 |
| D. | (6V/ π)3 |
| Answer» C. (6V/ π)2 | |
| 416. |
Which one of the following loading is considered for the design of axles? |
| A. | Bending moment only |
| B. | Twisting moment only |
| C. | Combined bending moment and twisting moments |
| D. | Combined action of bending moment, twisting moment and axial thrust |
| Answer» B. Twisting moment only | |
| 417. |
The coefficient of friction between the belt and pulley depends upon the |
| A. | Material of belt and pulley |
| B. | Slip of belt |
| C. | Speed of belt |
| D. | All of these |
| Answer» E. | |
| 418. |
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________. |
| A. | Less than unity |
| B. | Greater than unity |
| C. | Equal to 1 |
| D. | None of these |
| Answer» B. Greater than unity | |
| 419. |
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called |
| A. | Repeated stress |
| B. | Yield stress |
| C. | Fluctuating stress |
| D. | Alternating stress |
| Answer» D. Alternating stress | |
| 420. |
The design of the pressure vessel is based on |
| A. | Longitudinal stress |
| B. | Hoop stress |
| C. | Longitudinal and hoop stress |
| D. | None of these |
| Answer» C. Longitudinal and hoop stress | |
| 421. |
The value of Lewis form factor used in design of gears is |
| A. | Dependent on number of teeth of a gear |
| B. | Dependent on system of teeth |
| C. | Independent of size of teeth |
| D. | All of these |
| Answer» E. | |
| 422. |
The most important dimension in the design of a nut is |
| A. | Pitch diameter |
| B. | Inside diameter |
| C. | Outside diameter |
| D. | Height |
| Answer» E. | |
| 423. |
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is |
| A. | 1/2 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 424. |
According to Indian standards, total numbers of tolerance grades are |
| A. | 8 |
| B. | 12 |
| C. | 18 |
| D. | 20 |
| Answer» D. 20 | |
| 425. |
In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole) |
| A. | 1 d |
| B. | 1.5 d |
| C. | 2.5 d |
| D. | 2 d |
| Answer» C. 2.5 d | |
| 426. |
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm) |
| A. | 1420 d |
| B. | 1680 d |
| C. | 2080 d |
| D. | 2840 d |
| Answer» E. | |
| 427. |
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be |
| A. | 2/8 |
| B. | 8/2 |
| C. | 4/8 |
| D. | 8/4 |
| Answer» D. 8/4 | |
| 428. |
Surface endurance limit of gear material is dependent upon its |
| A. | Elastic strength |
| B. | Yield strength |
| C. | Brinell hardness number |
| D. | Toughness |
| Answer» D. Toughness | |
| 429. |
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to(Where, Pc = tension in belt due to centrifugal force) |
| A. | 3 Pc |
| B. | 1 Pc |
| C. | Pc/3 |
| D. | 2 Pc |
| Answer» B. 1 Pc | |
| 430. |
The strength of the unriveted plate (P) per pitch length is equal to |
| A. | p.d.σt |
| B. | p.t.σt |
| C. | (p - d) σt |
| D. | (p - d) t.σt |
| Answer» C. (p - d) σt | |
| 431. |
The permissible stress for carbon steel under static loading is generally taken as |
| A. | 2000-3000 kg/m² |
| B. | 3000-4000 kg/cm² |
| C. | 4000-4500 kg/cm² |
| D. | 7500-10,000 kg/cm² |
| Answer» D. 7500-10,000 kg/cm² | |
| 432. |
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as |
| A. | Spur gearing |
| B. | Helical gearing |
| C. | Bevel gearing |
| D. | Spiral gearing |
| Answer» E. | |
| 433. |
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct? |
| A. | There are four rivets per pitch length, all in double shear |
| B. | There are four rivets per pitch length, out of which two are in single shear and two are in double shear |
| C. | There are five rivets per pitch length, all in double shear |
| D. | There are five rivets per pitch length, out of which four are in double shear and one is in single shear |
| Answer» E. | |
| 434. |
The shear stress at a point in a shaft subjected to a torque is |
| A. | Directly proportional to the polar moment of inertia and to the distance of the point from the axis |
| B. | Directly proportional to the applied torque and inversely proportional to the polar moment of inertia |
| C. | Directly proportional to the applied torque and the polar moment of inertia |
| D. | Inversely proportional to the applied torque and the polar moment of inertia |
| Answer» C. Directly proportional to the applied torque and the polar moment of inertia | |
| 435. |
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» D. Bending stress | |
| 436. |
The backlash for spur gears depends upon |
| A. | Module |
| B. | Tooth profile |
| C. | Both module and pitch line velocity |
| D. | Pitch line velocity |
| Answer» D. Pitch line velocity | |
| 437. |
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called |
| A. | Hydrostatic lubricated bearing |
| B. | Hydrodynamic lubricated bearing |
| C. | Boundary lubricated bearing |
| D. | Zero film bearing |
| Answer» B. Hydrodynamic lubricated bearing | |
| 438. |
The building up of worn and undersized parts, subjected to repeated loads by electroplating is |
| A. | Best method |
| B. | Extremely hazardous |
| C. | Has no effect as regards fatigue strength |
| D. | Cheapest method |
| Answer» B. Extremely hazardous | |
| 439. |
Which of the following screw thread is adopted for power transmission in either direction? |
| A. | Acme threads |
| B. | Square threads |
| C. | Buttress threads |
| D. | Multiple threads |
| Answer» C. Buttress threads | |
| 440. |
The radial distance from the __________ to the clearance circle is called working depth. |
| A. | Addendum circle |
| B. | Dedendum circle |
| C. | Pitch circle |
| D. | None of these |
| Answer» B. Dedendum circle | |
| 441. |
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'. |
| A. | One-eighth |
| B. | One-fourth |
| C. | One-half |
| D. | Double |
| Answer» B. One-fourth | |
| 442. |
A chain drive transmits __________ power as compared to belt drive. |
| A. | More |
| B. | Less |
| C. | Same |
| D. | None of these |
| Answer» B. Less | |
| 443. |
In a steam engine, the piston rod is usually connected to the cross-head by means of a |
| A. | Knuckle joint |
| B. | Cotter joint |
| C. | Oldham coupling |
| D. | Universal joint |
| Answer» C. Oldham coupling | |
| 444. |
If a material fails below its yield point, failure would be due to |
| A. | Straining |
| B. | Fatigue |
| C. | Creep |
| D. | Sudden loading |
| Answer» C. Creep | |
| 445. |
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves |
| A. | Axially upwards |
| B. | Axially downwards |
| C. | Axially upwards or downwards |
| D. | None of these |
| Answer» D. None of these | |
| 446. |
The radial distance of a tooth from the pitch circle to the top of the tooth is called |
| A. | Addendum |
| B. | Dedendum |
| C. | Clearance |
| D. | Working depth |
| Answer» B. Dedendum | |
| 447. |
In a transverse fillet welded joint, the size of weld is __________ the throat of weld. |
| A. | 0.5 times |
| B. | Equal to |
| C. | 2 times |
| D. | Double |
| Answer» D. Double | |
| 448. |
In a butt welded joint, the size of weld is __________ the throat of weld. |
| A. | 0.5 times |
| B. | Equal to |
| C. | 2 times |
| D. | Double |
| Answer» C. 2 times | |
| 449. |
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress. |
| A. | One-fourth |
| B. | One-third |
| C. | One-half |
| D. | Double |
| Answer» C. One-half | |
| 450. |
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to |
| A. | Reduce vibration |
| B. | Reduce slip |
| C. | Ensure uniform loading |
| D. | Ensure proper alignment |
| Answer» D. Ensure proper alignment | |