UPMRC Fitter Maintainer (Civil) Paper with solution -2021

Que.1. A tool that is used to remove the drill from the spindle hole is known as:

  1. Vice
  2. Tapered shank
  3. Drift
  4. Tang

Answer.3. Drift

Explanation

DRILL DRIFT:-  A wedge-shaped piece of steel that is used to remove tapered shank tools, such as drills from spindles, sockets, and sleeves.

 

Ques.2. A pipe vice is used to

  1. To melt the pipe
  2. To manufacture the milling machine
  3. To manufacture the drilling machine
  4. To hold the pipe in position during different operations on the pipe

Answer.4. To hold the pipe in position during different operations on the pipe

Explanation:-

A vice is used for gripping and holding a workpiece in position for carrying out on its various bench working operations.

Fitter Vice include

  1. Pipe vice
  2. Leg vice
  3. Pin vice
  4. Bench Vice
  5. Hand Vice

Pipe vice:- Pipe ice is used to hold pipes for cutting and threading. It is made of cast iron but has a handle of mild steel. Its size is given by the diameter of its jaws. The lower jaw is fixed whereas the upper jaw is movable. The size of its jaw is 0 to 250 mm and 0 to 500 mm.

 

Ques.3. Lubricant starvation occurs due to the _____ of a lubricant

  1. Undersupply
  2. A higher freezing point
  3. Oversupply
  4. Thermal stability

Answer.1. Undersupply

Explanation:-

Starvation occurs when the lubricated contact uses up the lubricant supply, and there is not enough lubricant in the contact to support the separation between solid surfaces. “Lubricant starvation” is a special case of undersupply. If there is not enough lubricant available starvation occurs which may lead to increased friction, wear, and related undesired effects. In the worst case, this results in total failure of the respective machine or assembly.

 

Ques.4. Which of the following is NOT the type of drill

  1. Twist drill
  2. Flat drill
  3. Periphery drill
  4. Centre drill

Answer.3. Periphery drill

Explanation:-

A drill is a tool used to make cylindrical holes by rotating and pressing the tool against a workpiece. 

Drills are manufactured in a wide variety of types and sizes. The following types of drills are most widely used.

  1. Flat drill
  2. Straight-Fluted drill
  3. Twist drill
  4. Oil hole drill
  5. Centre drill

Note:- Periphery is the outer circumference of the drill.

 

Ques.5. BSP is known as:-

  1. Bharat standard pipe
  2. Belgium standard pipe
  3. Bombay standard pipe
  4. British standard pipe

Answer.4. British Standard pipe

Explanation:-

British Standard Pipe (BSP) and British Standard Pipe Threads (BSPT) relate to the type of thread used on screwed low carbon steel pipes and fittings. Although the pipe is measured in mm, it is universally referred to in imperial measurements, e.g. ‘x-inch BSPT (meaning x-inch British Standard Pipe Thread). 

 

Ques.6. Compound rest is used for

  1. Converting rotational motion to linear motion
  2. To hold the workpiece
  3. To move the carriage from left to right and vice versa
  4. For supporting the tool post and cutting the tool in different positions

Answer.4. For supporting the tool post and cutting the tool in different positions

Explanation:-

Compound rest: It supports the tool post and is mounted on the top of the cross slide. It has a graduated circular base and can be swiveled to any angle for getting a taper and angular cuts on a job. The compound rest is moved manually by rotating its handle.

 

Ques.7. The size of a manufactured component obtained by measurement indicates the:

  1. Minimum size
  2. Actual size
  3. Basic size
  4. Maximum size

Answer.7. Actual size

Explanation:-

Measurement: Measurement is a process of comparing the method of any numerical value of dimension with pre-calibrated instrument/devices or we may say in this method numerical value of dimensions is observed by direct comparing with the workpiece with standard instrument tools.

Actual size: Actual size may be defined as the dimensions achieved by any matching/production process against the nominal size.

To distinguish between nominal and actual size, nominal size is written without any dimension, for example, 2 x 10, whereas dimensions are included when describing actual sizes, such as 1 x 9  inches or 38 x 235 mm. When working in metric units, only actual sizes are used.

 

Ques.8. Which of the following is NOT a corrosive flux used in soldering?

  1. Zinc chloride
  2. Ammonium chloride
  3. Hydrochloric acid
  4. Rosin

Answer.4. Rosin

Explanation:-

To make a satisfactory joint, both the metal to be joined and the solder must be free of dirt, grease, oxides, and other foreign matter which would keep the solder from adhering to the metal. Fluxes are used to clean the joint area, to remove the oxide film which is normally present on any metal, and to prevent further oxidation. Fluxes also decrease the surface tension of the solder and thus make the solder a better wetting agent.

Fluxes are generally classified as corrosive, mildly corrosive, and noncorrosive.

CORROSIVE FLUXES have the most effective cleaning action. However, any trace of corrosive flux that remains on the work will cause subsequent corrosion of the metal. Therefore corrosive fluxes are not used for soldering electrical connections and for other work in which corrosion would present a serious problem.

The most commonly used corrosive fluxes are sal ammoniac (ammonium chloride) and zinc chloride. These fluxes are frequently used in solution or in paste form. The solvent is evaporated as the work is heated, leaving a layer of solid flux on the work. At the soldering temperature, this layer of flux melts and partially decomposes, liberating hydrochloric acid. The hydrochloric acid dissolves the oxides from the surface of the work and from the solder.

Note:- Rosin is a Non-corrosive flux used in soldering

 

Ques.9. Which of the following is use of a tapered roller bearing?

  1. It is used when the axial thrust is more than the radial load.
  2. It is useful for taking vertical thrust load.
  3. It is used to take light radial loads.
  4. It is used when the outside diameter of the bearing is severely restricted.

Answer.1. It is used when the axial thrust is more than the radial load.

Explanation:-

Depending upon the type of rolling element, the bearings are classified as

  1. Ball-bearing
  2. Cylindrical roller bearing,
  3. Taper roller bearing
  4. Needle bearing.

Depending upon the direction of load, the bearings are also classified as radial bearing and thrust bearing.

 There are roller bearings designed for radial loads and others designed for axial loads. A tapered roller bearing is designed to accept both radial and axial loads. Its rollers turn at an angle to the bearing assembly’s axis rather than parallel to it. The rollers are also slightly tapered to fit the angle of the inner and outer races.

The advantage of tapered Roller Bearing is

  1. Taper roller bearing can take heavy radial and thrust loads,
  2. Taper roller bearing has more rigidity
  3. Taper roller bearing can be easily assembled and disassembled due to separable construction.

 

Ques.10. Oxy-acetylene cutting consists of:

  1. One black cylinder of oxygen and one maroon cylinder of acetylene.
  2. One red cylinder consisting of a mixture of oxygen and acetylene
  3. One maroon cylinder of oxygen and one black cylinder of acetylene.
  4. One maroon cylinder consisting of a mixture of oxygen and acetylene.

Answer.1. One black cylinder of oxygen and one maroon cylinder of acetylene

Explanation:-

Oxyacetylene Welding Equipment:

Following equipment are used in oxyacetylene welding

Gas cylinders: Two gas cylinders made of steel are used. One is of black color used for oxygen and the other is of maroon or red color used for acetylene.

Pressure gages: Each cylinder consists of two pressure gauges. One pressure gauge shows the pressure of the gas inside the cylinder and the other shows the pressure of gas supplied to the blowpipe.

Pressure regulator: Each cylinder is provided a pressure regulator. The function of the pressure regulator is to control the pressure of the gas supply to blowpipe or to maintain the constant pressure of the gas.

Blowpipe or welding torch: The high-pressure blowpipe consists of two passages: one is for oxygen and the other is for acetylene. Both the gases are mixed in a chamber and then driven out through the orifice of the blowpipe nozzle with the desired velocity. These nozzles are usually known as tips and are made interchangeable so that the same blowpipe can be used for different sizes of tips.

Note: Acetylene cannot be filled alone in a cylinder due to dissociation at high pressure so it is mixed with a small amount of acetone.

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