UPMRC Fitter Maintainer (Civil) Paper with solution -2021

Answer.1. Blade

Explanation:-

The vernier bevel protractor is a precision angle-measuring tool designed for layout and checking of angles to an accuracy closer than one degree. It consists of two members, a base and a blade, which may be revolved in relation to each other and set in any desired position. The position of one member in relation to the other is indicated on a dial scale graduated with four scales from 0 to 90 degrees.

Answer.4. Killed Spirits

Explanation:-

The functions of flux in soldering are to activate the cleaned metal surfaces to be joined, protect that cleaned surface during heating processes, and be available to protect the molten solder at the proper processing temperature.

Fluxes may be classified into three groups:

(1). Inorganic fluxes (most active):- This class of flux includes inorganic acids and salts. These fluxes are used where conditions require rapid and highly active fluxing action. They can be applied as solutions, pastes or dry salts.

(2). Organic fluxes (moderately active):- They are active at soldering temperatures, but the period of activity is short because of their susceptibility to thermal decomposition. Organic fluxes are particularly useful in applications where controlled quantities of flux can be applied and where sufficient heat can be used to fully decompose or volatilize the corrosive constituents.

Zinc chloride commonly called “Killed Spirits” of Salts and forms the base for more commercially produced fluxes. A good genera flux suitable for mild steel, brass, copper, ternplate, and Tinplate

(3). Rosin fluxes (least active):-  Rosin fluxes possess important physical and chemical properties which make them particularly suitable for use in the electrical industry.

Answer.3. Shank

Explanation

Usually, all the drilling tools have straight or tapered shank. This shank must be held in a machine spindle when machining is to be carried out. The shank sizes may be different for different drills. To hold the drill in the spindle, proper drill heads are required. Some of the tool holding devices commonly used in a drilling machine are:

1. Sleeve
2. Socket
3. Drill chucks

Sleeve: When the drill shank size is smaller than the spindle of the machine, then the device used to hold the small shank drill is called a sleeve. The drilling tool required to hold in the spindle is first fitted into the inner taper of the sleeve. 

Socket: The device used to hold the drill, when the tapered shank of the tool is larger than the spindle taper, is called a socket.

Drill chucks: The drill chuck is similar to the jaw chuck of the lathe. It is used to hold the tools having straight shanks and also used to hold smaller to large-sized tools. 

Answer.3. Ear

Explanation:-

Hammer

A hammer is the most common and generally used striking tool in a fitting shop for the purpose of chipping, cutting, punching, etc. with the help of a chisel.

A hammer has four parts like peen, eye, cheeks, and face. The peen is the rounded top part of the hammer and when the top part is of ball shape or spherical then it is called a ball-peen hammer. Eye hole is usually oval or elliptical in cross-section to accommodate the handle made of wood.

Types of hand hammer

1. Ball peen hammer
2. Straight peen hammer
3. Cross peen hammer

Answer.3. The pipe is gripped between movable jaws

Explanation:-

In a pipe holding device the pipe is gripped between movable jaws.

A pipe wrench is another type of adjustable wrench used for holding and turning round objects.  The adjusting nut allows the jaw opening to increase and decrease in size. Because the pipe wrench jaws will inevitably damage part surfaces, it has a very limited application in collision repairs. It is commonly used for removing heavily corroded or damaged parts that might otherwise not be removable with standard tools and wrenches.

Answer.3. Allows full flow in one direction and low flow in the other

Explanation:-

A restriction check valve (often called a throttle relief valve in pneumatics) allows full flow in one direction and a reduced flow in the other direction. A needle valve sets restricted flow to the required valve. 

Answer.1. Siphon-wick system

Explanation:-

Siphon Wick-feed Method- It is a part of the gravity lubrication method. This method employs a worsted yarn to achieve a siphoning effect. Worsted wicks give a regular and reliable supply of oil and also filter and strain the same. A wick consisting of the proper number of strands is fitted into each oil tube. To attain proper lubrication, the appropriate size of wick for the lubricant used must be studied.

Answer.4. Flush type pressure gun

Explanation

Grease is applied by a grease gun or pumps through a nozzle that is designed to match the fitting.

• Lever grease guns – Also called manual grease guns, this type is operated via a simple pressure trigger mechanism, enabling the user to control force and flow rate through their own physical squeezing force

• Hand pump grease guns – This type features a pressurized pump handle or piston as part of the tool, which is primed before use to create a build-up of pressure, and subsequently released via a trigger mechanism to force the lubricant through the fitting

• Pneumatic grease guns – Air-powered models that attach to a compressor via a length of hose, offering greater power for industrial or larger commercial applications

• Battery-powered grease guns – This is a low-voltage, battery-powered grease gun that works comparably to the pneumatic grease gun.

Answer.2. Hydrogen

Explanation:-

Hydrogen is only used for brazing, silver soldering, and underwater gas cutting of steel. The stability makes hydrogen necessary for deep underwater cutting where the pressure required to overcome the hydrostatic pressure and operate the blowpipe would make acetylene dangerous.

Answer.1. Toughness

Explanation

The ability of a specimen to absorb a large amount of energy per unit volume before fracture is a measure of the toughness of the material. Mild steel and copper with 20-30% plastic strains absorb large amounts of energy before breaking and so are tough materials.