MCQ on
Mechanical Energy Based Unconventional Machining Process
1.In abrasive jet
machining, as the distance between the nozzle tip and the work surface
increases, the material removal rate
a)increases continuously
b) decreases continuously
c) decreases, becomes
stable and then increases
d) increases, becomes
stable and then decreases
2.The size of abrasive
grains in abrasive jet machining ranges from
a) 1 to 10 microns
b) 10 to 50 microns
c) 50 to 100 microns
d) 100 to 500 microns
3.The vibrating frequency
used for the tool in Ultrasonic machining is of the order of
a) 10,000 oscillations per
second
b) 35,000 oscillations per
second
c) 35,000 oscillations per
second
d) 45,000 oscillations per
second
4.In Ultrasonic machining,
the material is removed by
a) anodic dissolution
b) thermal melting
c) abrasive action
d) electrochemical
oxidation
5.Ultrasonic machining can
machine both metallic and non-metallic surfaces
a) True
b) False
6.Which of the following
machining process(es) use mechanical energy as the principal energy source ?
a) conventional milling
b) water jet cutting
c) wire cut EDM
d) abrasive jet machining
7.Abrasives contained in a
slurry are driven at a high velocity against the work by a tool vibrating at
low amplitude and high frequency.This is the metal removing mechanism
for__________________
a) USM
b) LBM
c) WJM
d) AJM
8.In USM, the amplitude
of vibrating tool is,
a) 10 - 50 micro meter
b) 500 - 5000 micro meter
c) 20 - 20000 micro meter
9.Which of the following
material is not generally machined by USM
a) Copper
b) Glass
c) Silicon
d) Germanium
10.Tool in USM is generally
made of
a) Glass
b) Ceramic
c) Carbides
d) Steel
11.Increasing volume
concentration of abrasive in slurry (in USM process) would affect MRR in the following manner
a) increase MRR
b) decrease MRR
c) would not change MRR
d) initially decrease and
then increase MRR
12.In water jet cutting and
abrasive water jet cutting, the separation between the nozzle opening and the
work surface is called which one of the following
a) Gap
b) gap size
c) orifice
d stand-off distance
13.In abrasive water jet
cutting, the abrasive particles are added to the water stream
after it exits the nozzle
a) before it enters the
pumping unit
b) just before it enters
the nozzle
c) while it is in the
nozzle
14.AJM nozzles are made of
a) low carbon steel
b) HSS
c) WC
d) Stainless steel
15.Material removal takes
place in AJM due to
a) electrochemical action
b) fatigue failure of the
material
c) sparking on impact
d) mechanical impact
16.As the stand off
distance increases, the depth of penetration in AJM
a) Increases
b) decreases
c) does not change
d) initially increases and
then remains steady
17.Abrasive slurry is used
in the following type of machining process.
a) Ultrasonic machining
b) Conventional milling
c) Wire cut EDM
d) Laser beam machining
18.The following principle
is used for converting electrical energy into mechanical energy in USM
a) Faraday's law
b) Stefan's law
c) Piezoelectric effect
d) Thomson's law
19.The following device is
used for converting electrical impulses into mechanical vibration in USM
a) Transducer
b) oscillator
c) tank
d) pump
20.In AJM, removal of metal
takes place by bombardment of fine grained particle.
a) with air at high
velocity
b) with water at high
velocity
c) with kerosene at high
velocity
d) at controlled rate in
brine
21.In WJM, removal of metal
takes place by bombardment of fine grained particle.
a) with air at high
velocity
b) with water at high
velocity
c) with kerosene at high
velocity
d) at controlled rate in
brine
22.WJM cannot be used to
machine
a) frozen food
b) plywood
c) leather
d) steel plates