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

MECHANISM AND MACHINE MCQ ON GEAR

Q.1 Bevel gears have their teeth____.

A. Curved over the wheel rim

B. Cut on the surface of the frusta of cones

C. Inclined to wheel rim

D. Straight over the wheel rim

Ans-: B

Q.2 The product of circular pitch and diameteral pitch is equal to the _____.

A. Module

B. Unity

C. 1

D. π

Ans-: D

Q.3 A gear whose tooth traces are straight line generators of the cone is called ?

A. Hypoid gear

B. Straight bevel gear

C. Spiral bevel gear

D. None of the above

Ans-: B

Q.4 The tooth traces of the spiral bevel gear are _____.

A. Spiral

B. Straight

C. Curved

D. Zig-zag

Ans-: C

Q.5 Worm gears are generally used when the high speed reduction is required. What is the ratio ?

A. 5:1

B. 1:10

C. 2:5

D. 10:1

Ans-: D

Q.6 The sum of the arc of approach and the arc of recess is known as ___.

A. Arc of action

B. Arc of recess

C. Arc of approach

D. None of the above

Ans-: A

Q.7 The arc measured on pitch circle from the point of beginning of contact to the pitch point is called the ____.

A. Arc of action 

B. Arc of approach

C. Arc of recess

D. All of the above

Ans-: B

Q.8 The acute angle between the tangent to the helix and a plane perpendicular to axis of cylinder is ?

A. Helix angle

B. Base angle

C. Acute angle

D. Lead angle

Ans-: D

Q.9 The acute angle between the tangent to the helix and axis of the cylinder on which teeth are cut is called ?

A. Acute angle

B. Base angle

C. Lead angle

D. Helix angle

Ans-: D

Q.10 Which of the following is not the gear for non- parallel, non- intersecting shafts ?

A. Worm

B. Hypoid

C. Bevel

D. Helical

Ans-: C

multiple choice questions on gears and gear terminology

Q.1 The ratio of number of teeth and pitch circle diameter is called _____.

A. Diameteral pitch

B. Module

C. Pitch

D. Teeth diameter

Ans-: A

Q.2 The pitch circle diameter of an involute gear is dependent of the _____.

A. Base diameter 

B. Tooth thickness

C. Pressure angle

D. Addendum

Ans-: C

Q.3 Which of the following is not a type of gear ?

A. Helical

B. Spur

C. Circular

D. Bevel

Ans-: C

Q.4 Gears are used generally when the centre distances are relatively ____.

A. Short

B. Long

C. Variable

D. Zero

Ans-: A

Q.5 Which gear is a cylindrical whose tooth traces are straight helices i.e.,teeth are inclined at an angle to the gear axis.

A. Spur gear

B. Helical gear

C. Worn gear

D. Bevel gear

Ans-: B

Q.6 Which gear is a spur gear of infinite diameter?

A. pinion

B. Worn gear

C. Herringbone gear

D. Rack

Ans-: D

Q.7 Bevel gears are used to transmit _______ motion between the two shafts.

A. Circular

B. Straight

C. Rotary

D. Reciprocating

Ans-: C

Q.8 The pressure angle for involute gears is ?

A. Zero

B. Variable

C. Depend on size of teeth

D. always constant

Ans-: D

Q.9 If the peripheral velocity of gears lies between 3-15 m/sec then it is called ___.

A. High velocity gear

B. Low velocity gear

C. Medium velocity gear

D. None of the above

Ans-: C

Q.10 Pitch circle is always _____ than the base circle.

A. Bigger 

B. Smaller

C. Equal

D. Constant

Ans-: A

MECHANISM AND MACHINE MCQ -07 ON VIBRATION

Q.1 The motion completed in the time interval of a period is called ____.

A. Period

B. Frequency

C. Cycle

D. Time

Ans-: C

Q.2 In vibration after initial displacement, no external force act and the motion is maintained by the internal elastic forces is called ____________ vibration.

A. Free 

B. Damped

C. Natural

D. Forced 

E. A+ C

Ans-: E

Q.3 The number of complete cycles of motion in a unit interval of time is known as ____.

A. Frequency

B. Time

C. Period

D. Vibration period

Ans-: A

Q.4 The interval of time taken by the motion to repeat itself is known as the _____.

A. Cycle

B. Period

C. Frequency

D. None of the above

Ans-: B

Q.5 Due to the internal and external resistances, the energy processed by the system is gradually dissipated ,such type of vibration is known as the

_____.

A. Free vibration

B. Damped vibration

C. Torsional vibration

D. Forced vibration

Ans-: B

Q.6 When the periodic disturbing force is applied to the body, then vibrations have same frequency as the applied force is called ?

A. Natural vibration

B. Damped vibration

C. Torsional vibration

D. Forced vibration

Ans-: D

Q.7 Resonance is caused when the frequency of the external force coincides with the _____ of the system.

A. Natural vibration 

B. Force

C. Natural frequency

D. Vibration

Ans-: C

Q.8 Which of the following is not a type of vibration?

A. Free

B. Forced

C. Damped

D. Periodic 

Ans-: D

Q.9 If the damping factor for a vibrating system is unity, then the system is called ____ system.

A. Over damped

B. Under damped

C. Critically damped

D. Not damped

Ans-: C

Q.10 In forced vibrations the magnitude of damping force at resonance equals to _____.

A. Zero

B. Impressed force

C. Inertia force

D. Spring force

Ans-: B