July2016 FITTER TRADE THEORY SEMESTER - IV

July2016 FITTER TRADE THEORY SEMESTER - IV

The following is machined dry.
a) Aluminium
b) Cast iron
c) Titanium
d) All of these

The following device is used to determine the mix ratio of water-soluble coolants:
a) Diffract meter
b) Hydrometer
c) Refract meter
d) None of these

The use of metal working fluids ......
a) Increase the tool life
b) Produce better surface finish
c) Prevent rise in temperature
d) All of these

The main constituent(s) of mineral oil is/are ...........
a) Paraffin
b) Naphthenic
c) Aromatics
d) All of these

The following is used in heat treatment process as a quenching medium for obtaining a higher degree of hardness.
a) Mineral oil
b) Fatty acid
c) Waxes
d)Graphite suspensions

Which of the following is added to the cutting fluids so that soapy film is produced between the work piece & tool and chip & tool face?
a) Sulphur
b) Chlorine
c) Both (a) & (b)
d) None of these

Soluble oil is used as cutting fluid in ............
a) Sawing
b) Drilling and boring
c) Reaming
d) All of these

Usually no cutting oil is used in
a) Broaching
b) Planning and shaping
c) Thread rolling
d) Honing

Choose name of the bolt.
a) Gib Headed foundation bolt
b) Cotter foundation bolt
c) Through foundation bolt
d) Eye foundation bolt

........... are used to separate the tramp oil (sump oil) from coolant.
a) Magnetic separators
b) Skimmers
c) Rotating spindles
d) All of these

Which of the following parameters influence the axial feed rate in centreless grinding?
a) Regulating wheel diameter
b) Angle between the axes of grinding and regulating wheels
c) Speed of the regulating wheel
d) All of these

Hydraulic oil is compressible ........
a) Not at all
b) Very much
c) Very Little
d) None of these

Power =Torque x ............
a) Velocity
b) RPM
c) Force
d) Area

is prime mover in hydraulic system.
a) Oil
b) Electric Motor
c) Pipe
d) Impeller

Power of Pump ........... x Volume flow rate.
a) Velocity
b) RPM
c) Force
d) Pressure

1HP= ........?
a) 746 b) 1000 c) 100 d) 764

Which flat belt drive system has two pulleys mounted on driven shaft and one pulley on driving shaft?
a) Multiple belt drive
b) Cone pulley drive
c) Fast and loose pulley drive
d) None of these

Which of the following statements are false for belt drives?
i) Belt drive is used in applications having constant speed drive  ii) Belt drives can be used at extremely high speeds iii) Belt drives have low power transmitting capacity iv) Belt drives need continuous lubrication
a) (i) & (ii)
b) (i), (ii) & (iii)
c) (ii), (iii) & (iv)
d) (i), (ii) & (iv)

Determine power rating of an electric motor if it runs at 1440 r.p.m and line shaft  transmits torque of 75 Nm. Assume Reduction ratio = 1.6 .........
a) 10.36 kW
b) 11.3 kW
c) 7.068 kW
d) 9.12 kW

In simple gear trains the direction of rotation of driven gear is opposite to the   direction of rotation of driving gear only if
a) Even number of idler gears are present
b) Odd number of idler gears are present
c) Any number of idler gears are present
d) None of these

Why is an idler gear used in gear trains?
a) To obtain minimum center distance between driving and driven shaft
b) To have required direction of rotation
c) Both (a) & (b)
d. None of these

Determine torque transmitted on the pinion shaft if torque transmitted on gear shaft is  20 nm consider Gear ratio 4
a) 8 nm
b) 5 nm
c) 80 nm
d) 16 nm

Which of the following statements is/are true for gear drives?
a) They can be used for long center distances
b) They are used to transmit power between non-intersecting and parallel shafts
 c) They cannot be used for high reduction ratios
 d) All of these

Which gears are used to connect two intersecting shaft axes?
a) Crossed helical gear
b) Worm and worm wheel
c) Bevel gears
d) All of these

What is meant by gear ratio?
a) The ratio of pinion speed and gear speed
b) The ratio of number of teeth on pinion and number of teeth on gear
c) Both (a) & (b)
d) None of these

What is the function of hydraulic motor?
1. Hydraulic motor converts hydraulic oil under pressure into torque and angular   displacement
2. Hydraulic motor converts hydraulic oil under pressure into force and linear displacement
3. Hydraulic motor converts hydraulic energy into mechanical energy 4. Hydraulic motor converts mechanical energy into hydraulic energy
a) I and 4
b) I and 3
c) 2 and 3
d) 2 and 4

Calculate area of a pipe if, flow rate is 20 1/min and flow velocity is 5 cm/s.
a) 66.66 cm.sq.
b) 60 cm.sq.
c) 62 cm.sq.
d) None of these

What this hydraulic symbol means ..............
a) Motor unidirectional
b) Motor bidirectional
c) Pump unidirectional
d) Pump bidirectional

In soldering the melting point of filler metal is ............
a) Below 420‌°C
b) Above 420°C
c) Below 520°c
d) Above 520°C

The composition of electrician solder is ..............
a) Lead-37%, tin-63%
b) Lead-50%, tin-50%
c) Lead-63%, tin-37%
d) Lead-70%, tin-30%

The composition of soft solder is .............
a) Lead-37%, tin-63%
b) Lead-50%, tin-50%
c) Lead-63%, tin-37%
d) Lead-70%, tin-30%

Corrosion can be prevented by ..............
a) Alloying
b) Tinning
c) Galvanizing
d) All of these

As compare to iron, aluminum has ..............
a) Higher tendency to oxidize
b) Less tendency to oxidize
c) Equal tendency to oxidize
d) None of these

Conditions for good electroplating is/are .............
a) High current density
b) Low temperature
c) High concentration of metal in electrolyte
d) All of these

Iron is galvanized by coating with .................
a) Zinc
b) Tin
c) Copper
d) Nickel

Which defect arises due to faulty heat treatment?
a) Over heating and burring
b) Oxidation and decarburization
c) Cracks, distortion and warping
d) All of these

In general, hardening is followed by .............
a) Annealing
b) Normalizing
c) Tempering
d) Case hardening

This type of fastener is designed to prevent movement between shafts and wheels.
a) Keys
b) Machine pins
c) Rivets
d) Knuckle

A mechanical device that stores energy, when deflected and to return the equivalent amount of energy when released is known as a ............
a) Blind rivet
b) Key way
c) Spring
d) Hammer
 
Joint strength in brazing operation is ...........
a) As high as in gas or arc welding
b) Not as high as in gas or arc welding
c) Higher than that of in gas or arc welding
d) Unpredictable

Which of the following is a soft solder?
a) Copper-zinc alloy
b) Nickel-silver alloy
c) Lead-tin alloy
d) All of these

Transmission angle is the angle between
a) Input link and coupler
b) Input link and fixed link
c) Output link and coupler
d) Output link and fixed link

What this hydraulic symbol means ...........
a) Directional control valve
(4 ports /2 positions)
b) Directional control valve
(4 ports /3 positions)
c) Directional control valve
(5 ports /2 positions)
d) None of these

Module of a gear is ..........
a) D/T
b) T/D
c) 2D/T
d) 2T/D

When screw threads are to be used in a situation where power is being transmitted in   one direction only, then the screw threads suitable for this will be .................
a) Square threads
b) Knuckle threads
c) Acme threads
d) Buttress threads

Which of the following material has the maximum ductility?
a) Mild steel
b) Copper
c) Aluminium
d) Zinc

The sleeve or muff coupling is designed as a ...............
a) Dun cylinder
b) Solid shaft
c) Thick cylinder
d) Hollow shaft

In a flange coupling, the flanges are coupled together by means of .................
a) Studs
b) Bolts and nuts
c) Headless taper bolt
d) None of these

An open belt drive is used when .................
a) Driven shaft is to be started or stopped whenever desired without interfering with   the driving shaft
 b) Shafts are arranged parallel and rotate in the same directions
c) Shafts are arranged at right angles and rotate in one definite direction
d) Shafts are arranged parallel and rotate in the opposite directions

When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 900, then they are known as ...............
a) Internal bevel gears
b) Angular bevel gears
c) Crown bevel gears
d) Mitre gears


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