A basic hole is one whose
Lower deviation is zero
Upper deviation is zero
Lower and upper deviations are zero
None of these
Correct Answer :
A. Lower deviation is zero
Related Questions
The algebraic difference between the maximum limit and the basic size is called
Actual deviation
Upper deviation
Lower deviation
Fundamental deviation
In a cold chamber die casting machine
Melting pot is separate from the machine
Melting pot is an integral part of the machine
Melting pot may have any location
Low temperature and pressure is used
The purpose of a gate is to
Delivers molten metal into the mould cavity
Act as a reservoir for the molten metal
Feed the molten metal to the casting in order to compensate for the shrinkage
Delivers molten metal from pouring basin to gate
The cutting edge of a chisel should be
Hardened
Tempered
Hardened and tempered
Case hardened
In welding magnesium with TIG arc welding, direct current with _________ is used.
Straight polarity
Reversed polarity
Both (A) and (B)
None of these
Which one of the following material will require the largest size of riser for the same size of casting?
Aluminium
Cast iron
Steel
Copper
In forehand welding, the angle between the welding torch and the work is ________ as compared to backhand welding.
Same
Less
More
None of these
Metal patterns are used for
Small castings
Large castings
Complicated castings
Large scale production of castings
A mortise gauge is a
Striking tool
Planing tool
Boring tool
Marking tool
The recrystallisation temperature of steel is
400°C
600°C
800°C
None of these
Seam welding is best adopted for metal thickness ranging from
0.025 to 3 mm
3 to 5 mm
5 to 8 mm
8 to 10 mm
A file with 20 teeth in 25 mm is called
Rough file
Bastard file
Second cut file
Smooth file
The operation of straightening a curved sheet metal, is known as
Drawing
Squeezing
Coining
Planishing
The punch and die set up is ________ for punching and piercing operation.
Same
Similar
Different
None of these
In electric resistance welding, voltage required for heating is
1 to 5 volts
6 to 10 volts
11 to 20 volts
50 to 100 volts
When a hole or cavity to be cored is not in line with the parting surface, then a ________ is used.
Horizontal core
Vertical core
Drop core
Balanced core
In forehand welding, the angle between the welding rod and the work is kept as
30°-40°
40°-50°
50°-60°
60°-70°
The oxyacetylene gas used in gas welding produce a flame temperature of
1800°C
2100°C
2400°C
3200°C
The cold working of metals is carried out
At the recrystallisation temperature
Below the recrystallisation temperature
Above the recrystallisation temperature
At any temperature
Aluminium is the best material for making patterns because it is
Light in weight
Easy to work
Corrosion resistant
All of these
The dowels are
Wooden nails
Box nails
Wire nails
None of these
In arc welding, the temperature of heat produced by the electric arc is of the order of
3000°C to 4000°C
4000°C to 5000°C
5000°C to 6000°C
6000°C to 7000°C
Projection welding is a
Continuous spot welding process
Multi-spot welding process
Arc welding process
Process used for joining round bars
The electrode tip diameter (d) in spot welding should be equal to (where t = Thickness of plate to be welded)
t
1.5 t
3 t
6 t
In forehand welding, the weld is made
From left to right
From right to left
First from left to right and then from right to left
Either from left to right or from right to left
The advantage of Thermit welding is that
All parts of the weld section are molten at the same time
Weld cools almost uniformly
Results in a minimum problem with internal residual stresses
All of the above
In a compound die
Only one operation is performed at each stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram
Two or more cutting operations are performed at one station of the press in every stroke of the ram
Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as
Drawing
Squeezing
Coining
Planishing
The instrument which has all the features of try-square, bevel protractor, rule and scriber, is
Outside micrometer
Inside micrometer
Depth gauge micrometer
Combination set
A taper provided on the pattern for its easy and clean withdrawal from the mould is known as
Machining allowance
Draft allowance
Shrinkage allowance
Distortion allowance