181. Cores are used to
form internal cavities in the casting
improve mould surface
form a part of a green sand mould
all of these
✅ The correct answer is option D.
Workshop Technology MCQs
182. When the dimension is expressed as , then the basic size is
20 mm
20.035 mm
20.025 mm
19.975 mm
✅ The correct answer is option A.
183. The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is
less than 0.1 percent
less than 0.3 percent
more than 0.3 percent
any where between 0.1
✅ The correct answer is option C.
184. A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?
The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction.
The upper and bottom rolls rotate in the same direction whereas the middle roll rotate in opposite direction.
The bottom and middle roll rotate in the same direction.
any one of the above
✅ The correct answer is option B.
185. A casting defect which occurs due to improper venting of sand is known as
cold shuts
blow holes
shift
swell
✅ The correct answer is option B.
186. The two rolls in a two high rolling mills are of __________ size.
equal
different
✅ The correct answer is option A.
187. The metal extrusion process is generally used for producing
uniform solid sections
uniform hollow sections
uniform solid and hollow sections
varying solid and holl
✅ The correct answer is option C.
188. The electron beam welding can be carried out in
open air
a shielded gas environment
vacuum
a pressurised inert ga
✅ The correct answer is option C.
189. A basic hole is one whose
lower deviation is zero
upper deviation is zero
lower and upper deviations are zero
none of these
✅ The correct answer is option A.
190. The welding set up is said to have straight polarity, when
work is connected to the positive terminal and the electrode holder to the negative terminal
work is connected to the negative terminal and the electrode holder to the positive terminal
work is connected to the positive terminal and the electrode holder is earthed
work is connected to t
✅ The correct answer is option A.