WELDING MCQ-04

Q.1 Which of the following welding process uses consumable electrode ?

A. Laser

B. Arc

C. Gas

D. Metal inert gas

Ans-: D

Q.2 In arc welding operations the current value is decided by ___.

A. Size of the electrode

B. Thickness of electrode

C. Thickness of plate

D. Voltage across the arc

Ans-: A

Q.3 In thermit welding, the iron oxide and aluminium oxide are mixed in the proportion of __.

A. 2 : 1

B. 1 : 1

C. 3 : 1

D. 1 : 2

Ans-: C

Q.4 in the arc welding process, the following order of temperature may be generated ?

A. 1000° C

B. 5500° C

C. 15000 ° C

D. 8000 ° C

Ans-: B

Q.5 In arc welding, the arc length should be equal to the _____.

A. Diameter of electrode rod

B. Rod diameter

C. Twice the rod diameter

D. None of the above

Ans-: B

Q.6 In which welding process, the electrode gets consumed ?

A. Resistance

B. Friction

C. Arc

D. Gas

Ans-: C

Q.7 The strength of properly welded joint as compared to base metal would be ?

A. More

B. Less

C. Same

D. None of the above

Ans-: A

Q.8 In which welding process, arc blow occurs

A. Arc welding 

B. Gas welding

C. Friction welding

D. Resistance welding

Ans-: A

Q.9 Metal deposited on to the workpiece from the electrode is ______.

A. Falls because of gravity

B. Attracted due to electromagnetic action

C. Forced across the arc

D. None of the above

Ans-: C

Q.10 In the mannual tungsten inert gas welding, the angle of the electrode holder with the direction of welding is ____.

A. 30°

B. 45°

C. 70°

D. 180°

Ans-: C

WELDING MCQ-03

Q.1 In resistance welding, the voltage used for heating is ____.

A. 550 V

B. 200 V

C. 10 V

D. 100 V

Ans-: C

Q.2 The forge welding is best suited for which material?

A. High carbon steel

B. Wrought iron

C. Cast iron

D. High speed steel

Ans-: B

Q.3 For which material, preheating is essential in welding process?

A. Cast iron

B. Stainless steel

C. High speed steel

D. Aluminum

Ans-: A

Q.4 which welding process is best for grey cast iron?

A. Tungsten inert gas

B. Metal inert gas

C. Arc

D. Oxy-acetylene

Ans-: D

Q.5 Laser welding finds widest application in which industry?

A. Process industry

B. Heavy industry

C. Structural industry

D. Electronic industry

Ans-: D

Q.6 In welding process , edge preparation is not required upto what thickness of plate?

A. 8 mm

B. 4 mm

C. 10 mm

D. 5 mm

Ans-: B

Q.7 The phenomenon of weld decay occurs in which material?

A. Carbon steel

B. Stainless steel

C. Brass

D. Cast iron

Ans-: B

Q.8 In which type of welding any type of confi-guration can be welded?

A. Arc 

B. Metal inert gas

C. Friction

D. TIG

Ans-: C

Q.9 Grey cast iron is usually welded by ____.

A. Arc welding

B. Gas welding

C. Friction welding

D. Metal inert gas welding

Ans-: B

Q.10 TIG welding is best suited for which material ?

A. Aluminum

B. Cast iron

C. Silver

D. Gold

Ans-: A

WELDING MCQ -02

Q.1 Butt welding or upset welding is used for joining members of approximately __________.

A. Different cross-section

B. Equal cross-section

C. Depend on material

D. Depends on electrode 

Ans-: B

Q.2 The electrode is used in the resistance welding have which type of quality?

A. High electrical conductivity

B. Water cooled

C. High Heat conductivity

D. Good Mechanical strength

E. All of the above

Ans-: E

Q.3 Brazing is used for joining ____.

A. All metals

B. Dissimilar combination of metals

C. Only cast iron and steel

D. A+ B

Ans-: D

Q.4 In welding condition , when longitudinal shear is present then _____ weld is used.

A. Butt joint

B. T - joint

C. Lap joint

D. None of the above

Ans-: B

Q.5 In tungsten inert gas welding, following gases are used ?

A. Argon and neon

B. CO2 and H2

C. Helium and neon

D. Argon and helium

Ans-: D

Q.6 Two sheets of same material but different thickness can be butt welded by 

A. Pressure applied

B. Time duration of current

C. Changing the size of one electrode

D. Adjustment of the current

Ans-: C

Q.7  Copper is very difficult to be ____ welded.

A. Spot

B. Butt

C. T- joint

D. Lap joint

Ans-: A

Q.8 In metal inert gas welding process __.

A. Flux is required

B. Flux is not required

C. High welding speed required

D. None of the above

Ans-: B

Q.9 Grey cast iron is best welded by the ___.

A. Arc welding

B. Oxy-acetylene welding

C. MIG welding

D. TIG welding

Ans-: B

Q.10 In gas welding heat is supplied by burning a mixture of oxygen and ___ gas.

A. Hydrogen

B. Methane

C. Acetylene

D. CO2

Ans-: C

WELDING MCQ-01

Q.1 A pool of molten metal is used in which type of welding process?

A. Tungsten inert gas

B. Metal inert gas

C. Electroslag

D. Submerged arc

Ans-: C

Q.2 In arc welding, arc is created between the electrode and work by the ___.

A. Contact resistance

B. Voltage

C. Flow of current

D. Workpiece

Ans-: A

Q.3 Flux is a material which is used for ?

A. Slow consumption of electrode

B. Higher performance

C. Coating the electrode

D. All of the above

Ans-: C

Q.4 In arc welding, eyes need to be protected against __.

A. Gases

B. Infra-red rays

C. Ultraviolet rays

D. B + C

Ans-: D

Q.5 Which of the following is not a type of welding ?

A. Gas welding

B. Resistance welding

C. Thermit welding

D. Forge welding

E. Current welding

Ans-: E

Q.6 The arc welding is done with the ______ electrode.

A. Metal

B. Carbon or metal 

C. Aluminum

D. Tungsten

Ans-: B

Q.7 Which of the following welding process uses non-consumable electrode?

A. TIG welding

B. MIG welding

C. Laser welding

D. Plasma welding

Ans-: A

Q.8 For arc welding, the open circuit voltage is of the order of ___.

A. 10 to 40 volts

B. 40 to 95 volts

C. 75 to 95 volts

D. 5 to 10 volts

Ans-: B

Q.9 In arc welding , the selection of diameter of electrode is based on which criterion?

A. Current uses

B. Material to be weld

C. Thickness of material

D. Type of welding process

Ans-: C

Q.10 The material which is used for coating the electrode is called ?

A. Flux

B. Coating material

C. Slag

D. Binder

Ans-: A

MECHANISM AND MACHINE MCQ ON GEARS, VIBRATION, GOVERNOR

Q.1 The power of a porter governor is inversely proportional to ____.

A. S/2

B. S^2

C. S

D. S ^3

Ans-: B

Q.2 The weight of a porter governor is inversely proportional to_____.

A. S^2

B. ω

C. ω ^2

D. S

Ans-: C

Q.3 The stress in the disc type flywheel as compared to rim type flywheel is ___.

A. Greater

B. Less

C. Equal

D. None of the above

Ans-: A

Q.4 The effort of a porter governor is proportional to percentage increase in the __.

A. Speed 

B. Inversely proportional to speed

C. Velocity

D. None of the above

Ans-: A

Q.5 In which type of engine the cylinders are arranged along the radial lines ?

A. Motorcycle engine

B. Cars engine

C. Trucks engine

D. Aero engine

Ans-: D

Q.6 Which box is placed between the engine and clutch in automobiles?

A. Tool box

B. Gear box

C. Black box

D. Oil box

Ans-: B

Q.7 Which type of gears used for speed reduction of 50 : 1 ?

A. Bevel

B. Spur

C. Worm wheel

D. Herringbone

Ans-: C

Q.8 A single row six cylinder radial engine has following number of cranks?

A. Zero

B. Two

C. Three

D. One

Ans-: D

Q.9 The number of degrees of freedom in a continuous system would be ___.

A. Zero

B. Two

C. One

D. Four

Ans-: C

Q.10 The height of a simple watt governor is proportional to ___.

A. Speed ( N )

B. 1/ N

C. N ^2

D. None of the above

Ans-: A

multiple choice questions on gears, vibration, Governor etc.

Q.1 At node of the shaft , vibration are __.

A. Zero

B. Corresponding to natural frequency

C. Minimum

D. Maximum

Ans-: B

Q.2 The following numbers of nodes will have a shaft if it carrying two rotors at ends?

A. 1

B. 3

C. Zero

D. 2

Ans-: A

Q.3 Following degree of freedom a vibrating beam has ?

A. Zero

B. 1

C. 2

D. 3

Ans-: C

Q.4 The type of teeth provided on a gear used in sugar crushing machinery is ____.

A. Paraboloid

B. Involute

C. Hyperboloid

D. Cycloidal

Ans-: D

Q.5 A shaft carrying three rotors will have the following number of nodes ?

A. 2

B. 3

C. 5

D. 10

Ans-: A

Q.6 The following number of natural frequen-cies a three rotor system has ?

A. 1

B. 2

C. 3

D. 4

Ans-: B

Q.7 The ratio of mean speed of governor to governor speed range is known as ____.

A. Governor ratio

B. Sensitivity of Governor

C. Efficiency of Governor

D. Working capacity of Governor

Ans-: B

Q.8 What is the name given to gear trains where the axes of gears have motion?

A. Reverted gear train

B. Cycloidal gear train

C. Epicyclic gear train

D. None of the above

Ans-: C

Q.9 Scott-Russel Mechanism is used for generating a ______.

A. Circular path

B. Angular path

C. Straight line

D. Rectangular shape

Ans-: C

Q.10 Fast pulley used to transmit the _____.

A. Power

B. Energy

C. Work

D. Material

Ans-: A

MECHANISM AND MACHINE MCQ based on gears , vibration, gear train, Governor etc.

Q.1 The critical speed of a rotating shaft depends upon ____.

A. Mass

B. Velocity

C. Mass and stiffness

D. Weight

Ans-: C

Q.2 Cam and follower is a _____ type of pair .

A. Close

B. Open

C. Linked

D. Loose

Ans-: B

Q.3 The rate of decay of oscillations is known as the ?

A. Damping coefficient

B. Critical damping

C. Logarithmic decrement

D. All of the above

Ans-: C

Q.4 Which of the following effect is more dangerous for a ship?

A. Waving

B. Pitching

C. Rolling

D. Steering

Ans-: B

Q.5 In forced vibrations the magnitude of damping force at resonance equals to ____.

A. Spring force

B. Zero

C. Infinite

D. Impressed force

Ans-: D

Q.6 In the steady state forced vibrations, the phase lag at resonance condition is _____.

A. 90 ° 

B. 0 °

C. 45 °

D. 180 °

Ans-: A

Q.7 In gears , the tip of the tooth of a mating gear digs into the portion between base and root circle then what type of effect is done.

A. Increase speed

B. Interference takes place

C. Gears move smoothly

D. None of the above

Ans-: B

Q.8 For underdamped vibrating system, the amplitude of vibration with reference to time .

A. Remain constant

B. Increases linearly

C. Decrease exponentially

D. None of the above

Ans-: C

Q.9 The ratio of actual damping coefficient to the critical damping coefficient is called the?

A. Damping factor

B. Transmissibility

C. Magnification factor

D. None of the above

Ans-: A

Q.10 The damping force is proportional to the velocity .

A. In forced vibration system

B. In underdamped vibration system

C. In damped vibration system

D. All of the above

Ans-: C