MCQOPTIONS
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MCQOPTIONS
This section includes 48 Mcqs, each offering curated multiple-choice questions to sharpen your NTPC (Technical Ability) knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one of the following types of bearings is employed in shafts of gearboxes of automobiles? |
| A. | Hydrodynamic journal bearings |
| B. | Multi-lobed journal hearings |
| C. | \[\sqrt{(1-s)}\] |
| D. | Hybrid journal bearings. |
| Answer» D. Hybrid journal bearings. | |
| 2. |
In a single row deep groove ball-bearing, cages are needed to: |
| A. | Separate the two races |
| B. | Separate the balls from the inner race |
| C. | filament lamp |
| D. | Ensure that the balls do into cluster at one point and maintain proper relative angular positions. |
| Answer» E. | |
| 3. |
A certain minimum number of teeth is to be kept for a gear wheel: |
| A. | So that the gear is of a good size |
| B. | For better durability |
| C. | Both |
| D. | For better strength |
| Answer» D. For better strength | |
| 4. |
Which of the following stresses are associated with the design of pins in hushed pin-type, flexible coupling? 1. Bearing stress 2. Bending stress 3. Axial tensile stress 4. Transverse shear stress Select the correct answer using the codes given below: |
| A. | 1, 3 and 4 |
| B. | 2, 3 and 4 |
| C. | Type of material. |
| D. | 1, 2 and 4 |
| Answer» E. | |
| 5. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Single-plate friction clutch 1. Scooters clutch B. Multi-plate friction clutch 2. Rolling mills C. Centrifugal clutch 3. Trucks D. Jaw clutch 4. Mopeds Codes: |
| A. | A\[\to \]1, B\[\to \]3, C\[\to \]4, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]3, C\[\to \]2, D\[\to \]4 |
| C. | \[5\sqrt{2}\] |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| Answer» E. | |
| 6. |
For a two-dimensional state \[({{\sigma }_{1}},\,{{\sigma }_{2}},\,{{\sigma }_{1}}\]>\[0,\,{{\sigma }_{2}}\] |
| A. | Maximum principal strain theory |
| B. | Maximum distortion energy theory |
| C. | for inductive circuits |
| D. | Maximum principal stress theory |
| Answer» E. | |
| 7. |
Match List-I (Machine element) with List-II (Cause of failure) and select the correct answer using the codes given below the lists: List-I List-II A. Axle 1. Shear stress B. Cotter 2. Tensile/Compressive stress C. Connecting rod 3. Wear D. Journal bearing 4 Bending stress Codes: |
| A. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| C. | joule |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| Answer» C. joule | |
| 8. |
The shearing area of a key of length 'L' breadth 'b' depth 'h' is equal to: |
| A. | \[b\times h\] |
| B. | \[L\times h\] |
| C. | \[36\times 105\,\,Joules\] |
| D. | \[L\times (h/2)\] |
| Answer» D. \[L\times (h/2)\] | |
| 9. |
Which of the following stresses are associated with the tightening of nut on a bolt? (1) Tensile stress due to the stretching of bolt (2) Bending stress due to the bending of bolt (3) Crushing and shear stresses in threads (4) Torsional shear stress due to frictional resistance between the nut and the bolt. Select the correct answer using the codes given below: |
| A. | 1, 2 and 4 |
| B. | 1, 2 and 3 |
| C. | both [a] and [b] |
| D. | 1, 3 and 4 |
| Answer» E. | |
| 10. |
Which one of the following statements with regard to belt drives is not correct? |
| A. | Increase in the angle of wrap of the belt enables more power transmission |
| B. | Maximum power is transmitted when the centrifugal tension is three times the tight side tension |
| C. | Very high frequency (VHP) only |
| D. | Crown is provided on the pulley to make the belt run centrally on the pulley |
| Answer» C. Very high frequency (VHP) only | |
| 11. |
When a shaft transmits power through gears, the shaft experiences: |
| A. | Torsional stresses alone |
| B. | Bending stresses alone |
| C. | 20 |
| D. | Varying bending and constant torsional stresses |
| Answer» E. | |
| 12. |
Given that W = weight of load handled, W = weight of rope, and \[f=\] acceleration, the additional load in ropes of a hoist during starting is given by: |
| A. | \[{{F}_{a}}=\left( \frac{W-{{W}_{r}}}{g} \right)f\] |
| B. | \[{{F}_{a}}=\left( \frac{W+{{W}_{r}}}{g} \right)f\] |
| C. | White and black |
| D. | \[{{F}_{a}}=\left( \frac{{{W}_{r}}}{g} \right)f\] |
| Answer» C. White and black | |
| 13. |
Given that \[{{T}_{1}}\] and \[{{T}_{2}}\] are the tensions on the tight and slack of the belt respectively, the initial tension of the belt taking centrifugal tension \[{{T}_{c}}\] is equal to: |
| A. | \[\frac{{{T}_{1}}+{{T}_{2}}+{{T}_{c}}}{3}\] |
| B. | \[\frac{{{T}_{1}}+{{T}_{2}}+2{{T}_{c}}}{2}\] |
| C. | 17 kV |
| D. | \[\frac{{{T}_{1}}+{{T}_{2}}+4{{T}_{c}}}{3}\] |
| Answer» C. 17 kV | |
| 14. |
Which one of the following welding processes uses non-consumable electrodes? |
| A. | TIG welding |
| B. | MIG welding |
| C. | three |
| D. | Submerged arc welding |
| Answer» B. MIG welding | |
| 15. |
The bearing characteristic number in a hydrodynamic bearing depends on: |
| A. | Length, width and load |
| B. | Length, width and speed |
| C. | 3 |
| D. | Viscosity, speed and bearing pressure |
| Answer» D. Viscosity, speed and bearing pressure | |
| 16. |
In bearing characteristic number in a hydrodynamic bearing depends on: |
| A. | It is closer to real life situation |
| B. | It leads to a safer design |
| C. | excess holes |
| D. | No other assumption is possible |
| Answer» C. excess holes | |
| 17. |
Two rigid plates are clamped by means of bolt and nut with an initial force N. After tightening, separating force P (P |
| A. | (N+P) |
| B. | \[\left( N-P \right)\] |
| C. | Drain-source voltage and drain current |
| D. | N |
| Answer» B. \[\left( N-P \right)\] | |
| 18. |
In the calculation of induced shear stress in helical springs, the Wahl's correction factor is used to take care of: |
| A. | Combined effect of transverse shear stress and bending stress in the wire. |
| B. | Combined effect of bending stress and curvature of the wire. |
| C. | variations in current due to temperature changesone stage are amplified by other stages |
| D. | Combined effect of torsional shear stress an transverse shear stress in the wire |
| Answer» D. Combined effect of torsional shear stress an transverse shear stress in the wire | |
| 19. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Requirement) List-II (Type) A. High temperature service. 1. Teflon bearing B. High load 2. Carbon bearing C. No lubrication 3. Hydrodynamic bearing D. Bushings 4. Sleeve bearing Codes: |
| A. | A\[\to \]1, B\[\to \]2, C\[\to \]3, D\[\to \]4 |
| B. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| C. | movement of holes in valence band |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| Answer» E. | |
| 20. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Crank shaft 1. Supports the revolving part and transmits torque. B. Wire shaft 2. Transmits motion between shafts where is not possible to effect rigid coupling between them. C. Axle 3. Converts linear motion into rotary motion. D. Plain shaft 4. Supports only the revolving parts. Codes: |
| A. | A\[\to \]3, B\[\to \]2, C\[\to \]1, D\[\to \]4 |
| B. | A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 |
| C. | generate high power radio waves |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| Answer» D. A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 | |
| 21. |
The design calculations of 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. | is always zero |
| D. | None of the above |
| Answer» C. is always zero | |
| 22. |
Removal of metal particles from the raceway of a roiling contact bearing is a kind of failure of bearing known as: |
| A. | Pitting |
| B. | Wearing |
| C. | Antifriction bearings |
| D. | Scuffing |
| Answer» B. Wearing | |
| 23. |
Which one of the following loadings is considered for design of axles? |
| A. | Bending moment only |
| B. | Twisting moment only |
| C. | Separate the outer race from the balls |
| D. | Combined action of bending moment, twisting moment and axial thrust. |
| Answer» B. Twisting moment only | |
| 24. |
Consider the following design considerations: 1. Tensile failure 2. Creep failure 3. Bearing failure 4. Shearing failure 5. Bending failure The design of the pin of a rocker arm of an I.C. engine is based on: |
| A. | 1, 2 and 4 |
| B. | 1, 3 and 4 |
| C. | To avoid interference and undercutting |
| D. | 3, 4 and 5 |
| Answer» E. | |
| 25. |
Sources of power loss in a chain drive are given below: 1. Friction between chain and sprocket teeth. 2. Overcoming the chain stiffness. 3. Overcoming the friction in shaft bearing. 4. Frictional resistance of the motion of the chain in air or lubricant. The correct sequence of descending order of power loss due to these sources is: |
| A. | 1, 2, 3, 4 |
| B. | 1, 2, 4, 3 |
| C. | 1, 2 and 3 |
| D. | 2, 1, 4, 3 |
| Answer» B. 1, 2, 4, 3 | |
| 26. |
The load cup of a screw jack is made separate from the head of the spindle to: |
| A. | Enhance the load carrying capacity of the jack |
| B. | Reduce the effort needed for lifting the working load |
| C. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| D. | Prevent the rotation of load being lifted |
| Answer» E. | |
| 27. |
Consider the following statements about anti- friction bearings: 1. They have low starting and low running friction at moderate speeds 2. They have high resistance to shock loading. 3. They can carry both radial and thrust loads. 4. Their initial cost is high. 5. They can accommodated some amount of misalignment of shaft. Of these statements: |
| A. | 1, 2, 3 and 4 |
| B. | 1, 3 and 4 are correct |
| C. | Maximum shear stress theory |
| D. | 1, 2, 3 and 5 are correct |
| Answer» D. 1, 2, 3 and 5 are correct | |
| 28. |
The lead angle of a worm is \[22.5{}^\circ .\] Its helix angle will be: |
| A. | \[22.5{}^\circ \] |
| B. | \[45{}^\circ \] |
| C. | A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2 |
| D. | \[90{}^\circ \] |
| Answer» D. \[90{}^\circ \] | |
| 29. |
Match List-I with List-II and select answer using the codes given below the Lists: List-I (Types of joints) List-II (An element of the joint) A. Riveted joint 1. Pin B. Welded joint 2. Strap C. Bolted joint 3. Lock washer D. Knuckle joint 4. Fillet Codes: |
| A. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| B. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| C. | \[L\times b\] |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 |
| Answer» D. A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 | |
| 30. |
A motor car has wheel base of 280 cm and the pivot distance of front stub axles is 140 cm. When the outer wheel has turned through 30, the angle of turn of the inner front wheel for correct steering will be: |
| A. | \[60{}^\circ \] |
| B. | \[{{\cot }^{-1}}2.23\] |
| C. | 2, 3 and 4 |
| D. | \[30{}^\circ \] |
| Answer» D. \[30{}^\circ \] | |
| 31. |
Design of shafts made of brittle material is based on: |
| A. | Guest's theory |
| B. | Rankine's theory |
| C. | \[{{d}^{3}}\] |
| D. | Von-Mises theory. |
| Answer» C. \[{{d}^{3}}\] | |
| 32. |
Which of the following stresses are associated with the tightening of a nut on a stud? |
| A. | Tensile stresses due to stretching of stud. |
| B. | Bending stresses of stud. |
| C. | Wide and thin belt is preferable for better life than a thick and narrow one |
| D. | Torsional shear stresses in threads due to frictional resistance |
| Answer» C. Wide and thin belt is preferable for better life than a thick and narrow one | |
| 33. |
The most efficient riveted joint possible is one which would be as strong in tension, shear and bearing as the original plates to be joined. But this can never be achieved because: |
| A. | Rivets cannot be made with the same material |
| B. | Rivets are weak in compression |
| C. | Laser beam welding employs a vacuum chamber and thus avoids use of a shielding method |
| D. | Clearance is present between the plate and the rivet |
| Answer» D. Clearance is present between the plate and the rivet | |
| 34. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Type of joint) List-II (Mode of joining members) A. Cotter joint 1. Connects two rods or bars permitting small amount of flexibility B. Knuckle joint 2. Rigidly connects two members C. Turn buckle 3. Connects two rods having threaded ends D. Riveted joint 4. Permanent fluid-tight joint between two plates. 5. Connects two shafts and transmits torque Codes: |
| A. | A\[\to \]5, B\[\to \]1, C\[\to \]3, D\[\to \]2 |
| B. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| C. | Constant bending and varying torsional stresses |
| D. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| Answer» C. Constant bending and varying torsional stresses | |
| 35. |
Which key is preferred for the condition where a large amount of impact torque is to be transmitted in both direction of rotation: |
| A. | Woodruff key |
| B. | Feather key |
| C. | \[{{F}_{a}}=\left( \frac{W}{g} \right)f\] |
| D. | Tangent key |
| Answer» E. | |
| 36. |
The number of slots in a 25 mm castle nut are: |
| A. | 2 |
| B. | 4 |
| C. | \[\frac{{{T}_{1}}+{{T}_{2}}+3{{T}_{c}}}{2}\] |
| D. | 8 |
| Answer» D. 8 | |
| 37. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Type of Thread) List-II (Use) A. Square thread 1. Used in vice B. Acme thread 2. Used in lead screw C. Buttress thread 3. Used in screw jack D. Trapezoidal thread 4. Used in power transmission devices in machine tool Codes: |
| A. | A\[\to \]2, B\[\to \]3, C\[\to \]4, D\[\to \]1 |
| B. | A\[\to \]2, B\[\to \]3, C\[\to \]1, D\[\to \]4 |
| C. | Manual arc welding |
| D. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| Answer» D. A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 | |
| 38. |
6.0 kJ of conduction heat transfer has to take place in 10 minutes from one end to other end of a metallic cylinder of 10 cm cross-sectional area, length 1 metre and thermal conductivity as 100 W/m.K. What is the temperature difference between the two ends of the cylindrical bar? |
| A. | \[80{}^\circ C\] |
| B. | \[100{}^\circ C\] |
| C. | Viscosity, speed and load |
| D. | \[160{}^\circ C\] |
| Answer» C. Viscosity, speed and load | |
| 39. |
Upto the critical radius of insulation: |
| A. | Added insulation increases heat loss. |
| B. | Added insulation decreases heat loss. |
| C. | P |
| D. | Heat flux decreases. |
| Answer» D. Heat flux decreases. | |
| 40. |
In a mass transfer process of diffusion of hot smoke in cold air in a power plant, the temperature profile and the concentration profile will become identical when: |
| A. | Prandtl No. = 1 |
| B. | Nusselt No. = 1 |
| C. | Combined effect of transverse shear stress and curvature of the wire. |
| D. | Schemidt No. = 1 |
| Answer» E. | |
| 41. |
Intensity of radiation at a surface in perpendicular direction is equal to: |
| A. | Product of emissivity of surface and \[1/\pi .\] |
| B. | Product of emissivity of surface and \[\pi .\] |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| D. | Product of emissive power of surface and \[\pi .\] |
| Answer» D. Product of emissive power of surface and \[\pi .\] | |
| 42. |
When the lubricating oil is forced between the journal and bearing by external pressure, the bearing is known as: |
| A. | Zero film bearing |
| B. | Boundary lubricated bearing |
| C. | A\[\to \]3, B\[\to \]2, C\[\to \]4, D\[\to \]1 |
| D. | Hydrodynamic bearing |
| Answer» D. Hydrodynamic bearing | |
| 43. |
Weld spatter occurs due to any of the following except: |
| A. | High welding current |
| B. | Too small an electrode |
| C. | Goodman relation |
| D. | Wrong polarity |
| Answer» E. | |
| 44. |
Match List-I (Bearings) with List-II (Applications) and select the correct answer using the codes given below the lists: List-I List-II A. Journal hearing 1. Electric motors B. Thrust bearing 2. Watches C. Conical pivot bearing 3. Marine engines D. Ball bearing 4. Swivelling chairs Codes: |
| A. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| B. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| C. | Spilling |
| D. | A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 |
| Answer» D. A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 | |
| 45. |
The safe rim velocity of a flywheel is influenced by the |
| A. | Centrifugal stresses |
| B. | Fluctuation of energy |
| C. | Combined bending moment and torsion |
| D. | Mass of the flywheel |
| Answer» B. Fluctuation of energy | |
| 46. |
The performance of a hydrodynamic journal bearing is a function of: |
| A. | Reynolds number |
| B. | Sommerfield number |
| C. | 2, 3 and 5 |
| D. | Bearing modulus |
| Answer» E. | |
| 47. |
Angle of twist of a shaft of diameter d? is inversely proportional to: |
| A. | d |
| B. | \[{{d}^{2}}\] |
| C. | 2, 1, 3, 4 |
| D. | \[{{d}^{4}}\] |
| Answer» E. | |
| 48. |
Which one of the following sets of parameters should be monitored for determining safe operation of journal bearing? |
| A. | Oil pressure, bearing metal temperature and bearing vibration |
| B. | Bearing vibration, oil pressure and speed or shaft |
| C. | Reduce the value of frictional torque to be countered for lifting the load |
| D. | Oil pressure and bearing vibration. |
| Answer» B. Bearing vibration, oil pressure and speed or shaft | |