MCQOPTIONS
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MCQOPTIONS
This section includes 26 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. |
In oxy-acetylene gas welding, for complete combustion, the volume of oxygen required per unit of acetylene is: |
| A. | 1 |
| B. | 1.5 |
| C. | A positive pressure gradient |
| D. | 2.5 |
| Answer» D. 2.5 | |
| 2. |
Consider the following statements: MIG welding process uses 1. Consumable electrode 2. Non-consumable electrode 3. D. C power supply 4. A. C power supply. Of these statements: |
| A. | 2 and 4 are correct |
| B. | 2 and 3 are correct |
| C. | A\[\to \]4, B\[\to \]1, C\[\to \]3, D\[\to \]2 |
| D. | 1 and 3 are correct |
| Answer» E. | |
| 3. |
Match List-1 with List-11 and Select the correct answer using the codes given below the Lists: List-I (Filler) List-II (Joining process) A. Cu, Zn, Ag alloy 1. Braze welding B. Cu, Sn alloy 2. Brazing C. Pb, Sb alloy 3. Soldering D. Iron oxide and aluminium powder 4. TIG welding of aluminium. Codes: |
| A. | A\[\to \]4, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]2, C\[\to \]4, D\[\to \]3 |
| C. | \[2\,\sqrt{2}\] |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| Answer» D. A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 | |
| 4. |
In the network shown below in figure, the critical path is along |
| A. | \[1-2-3-4-8-9\] |
| B. | \[1-2-3-5-6-7-8-9\] |
| C. | 4 |
| D. | \[1-2-5-6-7-8-9\] |
| Answer» C. 4 | |
| 5. |
For the network shown in the given Fig. earliest expected completion time of the project is? |
| A. | 26 days |
| B. | 27 days |
| C. | A\[\to \]1, B\[\to \]3, C\[\to \]4 |
| D. | indeterminable |
| Answer» D. indeterminable | |
| 6. |
Match List I (Quality control concepts) with List II (Quality control techniques) and select the correct answer using the codes given below the lists: List-I (Quality control concepts) List-II (Quality control techniques) A. Tightened and reduced inspection 1. Dodge roming tables B. Lot tolerance percent defective 2. Control chart for variables C. Poisson distribution 3. MIL standards D. Normal distribution 4. Control chart for number of non-conformities Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| C. | \[{{\mu }^{2}}{{V}^{2}}{{L}^{2}}\] |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| Answer» D. A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]2 | |
| 7. |
Consider the following fits: 1. I.C engine cylinder and piston 2. Ball bearing outer race and housing 3. Ball bearing inner race and shaft Which of the above fits are based on the shaft basis system? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 |
| D. | 1, 2 and 3 |
| Answer» C. 1 | |
| 8. |
Consider the following statements in respect of double sampling plan: 1. Average number of pieces inspected is double that of single sampling. 2. Average number of pieces inspected is less than that for single sampling 3. Decision to accept or reject the lot is taken only after the inspection of both samples 4. Decision to accept or reject the lot is reached sometime after one sample and sometimes after two samples. Which of the statements are correct? |
| A. | 1, 2 and 3 |
| B. | 2 and 4 |
| C. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]4 |
| D. | 2 and 3 |
| Answer» E. | |
| 9. |
Preheating before welding is done to: |
| A. | Make the steel softer |
| B. | Bum away oil, grease, etc. from the plate surface |
| C. | \[{{\nabla }^{2}}\times \overrightarrow{\nabla }=1\] |
| D. | Prevent plate distortion |
| Answer» D. Prevent plate distortion | |
| 10. |
Match List-I (Welding) with List-II (Application) and select the correct answer using the codes given below the Lists: List-I (Welding) List-II (Application) A. Explosive 1. Joining thick sheets B. Ultrasonic 2. Manufacture of heat exchanges C. Thermite 3. Joining thin sheets or wires of similar/dissimilar metals D. Projection 4. Joining hydraulic piston rods heat for agricultural Machinery 5. Joining rails, pipes and thick steel sections Codes: |
| A. | A\[\to \]2, B\[\to \]5, C\[\to \]1, D\[\to \]3 |
| B. | A\[\to \]4, B\[\to \]5, C\[\to \]1, D\[\to \]3 |
| C. | \[\frac{\rho \,\omega \,{{D}^{2}}}{\mu }\] |
| D. | A\[\to \]4, B\[\to \]3, C\[\to \]5, D\[\to \]1 |
| Answer» D. A\[\to \]4, B\[\to \]3, C\[\to \]5, D\[\to \]1 | |
| 11. |
Two plain carbon steel specimens having 0.8% carbon content are weld. If we observe the weldment under Metallurgical Microscope from centre towards either side, the following structures are observed at different zones: 1. Fine Pearlite 2. Coarse Pearlite 3. Martensite Select the correct sequence using the codes given below: Codes: |
| A. | 1, 2, 3 |
| B. | 1, 3, 2 |
| C. | A hydraulic jump occurs when a supercritical flow comes across sub critical flow |
| D. | 3, 1, 2 |
| Answer» E. | |
| 12. |
The coating material of an arc welding electrode contains which of the following? 1. Deoxidising agent, 2. Arc stabilizing agent. 3. Slag forming agent Select the correct answer using the code given below |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 1 alone |
| D. | 1 and 3 only |
| Answer» D. 1 and 3 only | |
| 13. |
Consider the following statements in respect of oxydiacetylene welding: 1. The joint is not heated to a state of fusion. 2. No pressure is used. 3. Oxygen is stored in steel cylinder at a pressure of 14 MPa 4. When there is an excess of acetylene used, there is decided change in the appearance of flame. Which of the statements given above are correct? |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | The exact analysis of viscous flow problems can be made by Euler's equation |
| D. | 1, 2 and 4 |
| Answer» C. The exact analysis of viscous flow problems can be made by Euler's equation | |
| 14. |
Consider the following statement: The magnitude of residual stresses in welding depends upon 1. Design of welding 2. Support and clamping of components 3. Welding process used. Which of the statements given above are correct? |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» C. 1 and 3 | |
| 15. |
Fabrication weldability test is used to determine: |
| A. | Mechanical properties required for satisfactory performance of welded joint |
| B. | Susceptibility of welded joint for cracking |
| C. | Equal on both sides |
| D. | Appropriate machining process. |
| Answer» B. Susceptibility of welded joint for cracking | |
| 16. |
Which one of the following is not a fusion welding process? |
| A. | Gas welding |
| B. | Arc welding |
| C. | 4.43 |
| D. | Resistance welding |
| Answer» D. Resistance welding | |
| 17. |
In which of the following welding processes, flux is used in the form or granules? |
| A. | AC arc welding |
| B. | Submerged arc welding |
| C. | Steady flow, whether is compressible or not |
| D. | DC arc welding |
| Answer» C. Steady flow, whether is compressible or not | |
| 18. |
In atomic hydrogen welding hydrogen acts as: |
| A. | A heating agent |
| B. | One of the gases to generate the flame |
| C. | Linearly varying velocity |
| D. | A lubricant to increase the flow characteristics of weld metal. |
| Answer» C. Linearly varying velocity | |
| 19. |
Hot cracks occur in the weld and fusion zone as die metal solidifies. Which of the following are the causes for hot cracks? 1. Presence of sulphur and phosphorous for hot cracks. 2. High carbon or alloy content of the base metal. 3. Moisture in the joint or electrode. 4. Joint restraint. Select the correct answer using the code given below: |
| A. | 1, 2 and 4 |
| B. | 1, 2 and 3 |
| C. | laminar flow |
| D. | 1, 2, 3 and 4 |
| Answer» B. 1, 2 and 3 | |
| 20. |
Consider the following statements: 1. in arc welding, 65% to 75% heat is generated the anode. 2. Duty cycle in case of arc welding is the cycle of complete-welding of work piece from the beginning. 3. Arc blow is more common with DC welding. Which of the statements given above are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | vertical, flow upwards |
| D. | 1 and 3 |
| Answer» B. 1 and 2 | |
| 21. |
Which one of the following welding techniques in vacuum environment required? |
| A. | Ultrasonic welding |
| B. | Laser beam welding |
| C. | may be above or below centroid |
| D. | Electron beam welding |
| Answer» E. | |
| 22. |
Oxyacetylene reducing flame is used while carrying out the welding on: |
| A. | Mild Steel |
| B. | High carbon steel |
| C. | \[\beta =\frac{1}{{{k}^{2}}}\] |
| D. | Alloy steels |
| Answer» B. High carbon steel | |
| 23. |
In are welding D.C. reverse polarity is used to bear greater advantage in: |
| A. | Overhead welding |
| B. | Flat welding of lap joints |
| C. | an isolated system |
| D. | Flat welding of butt joints |
| Answer» C. an isolated system | |
| 24. |
Which one of the following statements is correct? |
| A. | No flux is used in gas welding of mild steel |
| B. | Borax is the commonly used flux coating welding electrodes |
| C. | 2 |
| D. | AC can be used for GTAW process |
| Answer» B. Borax is the commonly used flux coating welding electrodes | |
| 25. |
The correct sequence of the given materials ascending order of their weldability is: |
| A. | MS, copper, cast iron, aluminium |
| B. | Cast iron, MS, aluminium copper |
| C. | 1 and 4 are correct |
| D. | Aluminium, copper, cast iron, MS |
| Answer» E. | |
| 26. |
Which of the following joining processes are best suited for manufacturing pipes to carry gas products? 1. Rivetting 2. Welding 3. Bolts and nuts Select the correct answer using the codes given below: Codes: |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |