Explore topic-wise MCQs in Mechanical Engineering.

This section includes 382 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.

251.

In Magnetic abrasive finishing, which of the following particles do not contribute to the material removal?

A. abrasive particles
B. magnetic particles
C. non-magnetic particles
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
252.

Which of the following type of tools, are required for magnetic field assisted polishing?

A. rigid tools
B. expensive tools
C. magnetic tools
D. ultra precession tools
Answer» D. ultra precession tools
Discussion
253.

Pumping of electrolyte through the narrow gaps causes, which type of forces on tool and work piece?

A. large
B. small
C. negligible
D. no force
Answer» B. small
Discussion
254.

Electro chemical machining process cannot produce which of the following mentioned below?

A. drilled holes
B. deburred edges
C. sharp edges
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
255.

State whether the following statement is true or false regarding the limitations of ECM. “In electrochemical machining, duplicating the tool is easier.”

A. true
B. false
Answer» C.
Discussion
256.

How are material removal rates of ECM, when compared to that of conventional methods?

A. slower
B. faster
C. same
D. none of the mentioned
Answer» B. faster
Discussion
257.

How much amount of energy is consumed in Electro chemical machining?

A. very small
B. small
C. medium
D. large
Answer» E.
Discussion
258.

Which of the following are the limitations of electro chemical machining?

A. removal of hydrogen
B. handling the electrolyte
C. energy consumption
D. all of the mentioned
Answer» E.
Discussion
259.

What are the requirements of labour for machining purpose in Electrochemical machining?

A. low
B. medium
C. high
D. very high
Answer» B. medium
Discussion
260.

Which of the following materials can be machined using ECM?

A. hard nonconductive materials
B. hard conductive materials
C. all nonconductive materials
D. none of the mentioned
Answer» C. all nonconductive materials
Discussion
261.

Compared to other processes, machining is done at                      voltages for high rates of material removal.

A. low
B. medium
C. high
D. very low
Answer» D. very low
Discussion
262.

Passivation is done on electrolytes in order to form which of the following?

A. passive layer on machined parts
B. passive layer on cathode
C. passive layer on machined parts & cathode
D. none of the mentioned
Answer» B. passive layer on cathode
Discussion
263.

130 mm.

A. ± 0.01 mm
B. ± 0.025 mm
C. ± 0.13 mm
D. ± 0.25 mm
Answer» E.
Discussion
264.

Fine dimensional control can be obtained if throwing power of electrolyte is

A. low
B. medium
C. high
D. very high
Answer» B. medium
Discussion
265.

What happens when the current density is low in ECM?

A. pitting occurs
B. etching occurs
C. pitting & etching occurs
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
266.

If there is an increase in the electrolyte flow, what happens to the rate of film formation?

A. increases
B. decreases
C. remains same
D. all of the mentioned
Answer» C. remains same
Discussion
267.

For high process accuracy, which of the following factors are needed?

A. high feed rate
B. high conductivity
C. high feed rate & high conductivity
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
268.

If the current density is high as required, what type of machining occurs?

A. pitting
B. polishing
C. etching
D. all of the mentioned
Answer» C. etching
Discussion
269.

Tool insulation that                      the side machining action is needed in the process of ECM.

A. limits
B. enhances
C. maintains
D. none of the mentioned
Answer» B. enhances
Discussion
270.

Which properties of electrolyte does not affect the accuracy of the process?

A. temperature
B. concentration
C. non-reactive
D. pressure
Answer» D. pressure
Discussion
271.

Accuracy of machining is affected by, which of the following factors?

A. material
B. gap voltage
C. feed rate
D. all of the mentioned
Answer» E.
Discussion
272.

Which type of gap width is necessary for a higher degree of accuracy?

A. very small
B. small
C. medium
D. high
Answer» C. medium
Discussion
273.

In Electrochemical machining, larger grain size causes which type of finish?

A. smoother
B. rougher
C. finer
D. all of the mentioned
Answer» C. finer
Discussion
274.

Between which values does the side gap’s surface roughness vary?

A. >1 µm
B. >3 µm
C. >5 µm
D. >7 µm
Answer» D. >7 µm
Discussion
275.

For a better surface finish, which type of current distribution is required?

A. even
B. uneven
C. even & uneven
D. none of the mentioned
Answer» B. uneven
Discussion
276.

Surface roughness depend on which of the following quantities?

A. crystallographic irregularities
B. alloy composition
C. distribution of current density
D. all of the mentioned
Answer» E.
Discussion
277.

What must be the working voltage in Electrochemical machining?

A. 10 v
B. 20 v
C. 30 v
D. 40 v
Answer» C. 30 v
Discussion
278.

When machining Ti, in Nacl electrolyte, what values of current efficiencies are obtained?

A. 10 – 20 %
B. 20 – 30 %
C. 30 – 50 %
D. 50 – 80 %
Answer» B. 20 – 30 %
Discussion
279.

State whether the following statement is true or false about electrolyte in ECM. “Machinability in ECM is enhanced, when electrolyte is heated.”

A. true
B. false
Answer» B. false
Discussion
280.

When the electrolyte flow is low, what happens to the current efficiency?

A. increases
B. decreases
C. remains same
D. increase and then decrease
Answer» C. remains same
Discussion
281.

For alloys, which type of electrolyte is used in ECM?

A. single component
B. double component
C. multi component
D. triple component
Answer» D. triple component
Discussion
282.

Nickel can be machined with 100% current efficiency, when current density value is

A. 10 a/cm2
B. 25 a/cm2
C. 45 a/cm2
D. 80 a/cm2
Answer» C. 45 a/cm2
Discussion
283.

Better surface finish and higher accuracy depend on which of the factors below?

A. chemical composition of the electrolyte
B. current density
C. all of the mentioned
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
284.

Electro chemical dissolution phase starts with the movement of ions between which two components?

A. cathode and anode
B. cathode and power source
C. power source and anode
D. power source and electrolyte
Answer» B. cathode and power source
Discussion
285.

Too small gap causes which of the following effects?

A. sparking
B. short circuit
C. sparking & short circuit
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
286.

If the gap thickness is greater than equilibrium thickness what will be MRR?

A. mrr is less than feed rate
B. mrr is greater than feed rate
C. mrr is equal to feed rate
D. none of the mentioned
Answer» B. mrr is greater than feed rate
Discussion
287.

At constant gap thickness material removal becomes equal to feed rate. What is this gap called?

A. equal gap
B. equilibrium gap
C. unique gap
D. narrow gap
Answer» C. unique gap
Discussion
288.

When local metal removal rates are high, how will be the current density and current efficiency?

A. high
B. medium
C. low
D. very low
Answer» B. medium
Discussion
289.

During ECM drilling, decrease in feed rates lead to which type of machining gaps?

A. wider
B. narrow
C. small
D. none of the mentioned
Answer» B. narrow
Discussion
290.

In ECM, gap increase proportional to which relation of time below?

A. square of time
B. square root of time
C. cube of time
D. cube root of time
Answer» C. cube of time
Discussion
291.

At constant feed rates what happens to gap thickness?

A. increases
B. decreases
C. becomes constant
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
292.

State whether the following statement is true or false regarding the working principles. “In ECM, grain boundary attacks remove the grains through electrolytic forces.”

A. true
B. false
Answer» B. false
Discussion
293.

Apparent current efficiency is due to which of the following factors?

A. choice of wrong valence
B. passivation of anodic surface
C. gas evolution at anode
D. all of the mentioned
Answer» E.
Discussion
294.

In the following ratios of metal dissolved amounts, which one represent the current efficiency?

A. observed to theoretical
B. theoretical to observed
C. all of the mentioned
D. none of the mentioned
Answer» B. theoretical to observed
Discussion
295.

Current efficiency depends on which of the following in ECM?

A. anodic material
B. electrolyte
C. anodic material & electrolyte
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
296.

What must be the value of velocity of the electrolytic solution?

A. 10 to 15 m/s
B. 25 to 50 m/s
C. 60 to 100 m/s
D. 120 to 200 m/s
Answer» C. 60 to 100 m/s
Discussion
297.

Local metal removal rates are high at which gap locations mentioned below?

A. small gap
B. medium gap
C. large gap
D. none of the mentioned
Answer» B. medium gap
Discussion
298.

What must be the value of the pressure of electrolytic solution used in ECM?

A. 1 to 10 kpa
B. 10 to 80 kpa
C. 100 to 200 kpa
D. 300 to 400 kpa
Answer» D. 300 to 400 kpa
Discussion
299.

What must be the value of electrolytic temperature in ECM?

A. 2 to 14oc
B. 22 to 45oc
C. 46 to 57oc
D. 62 to 76oc
Answer» C. 46 to 57oc
Discussion
300.

Selection of electrolyte does not depend on which of the following factors?

A. work piece material
B. dimensional tolerance
C. heat affected zones
D. machining productivity
Answer» D. machining productivity
Discussion