I.C ENGINE MCQ

Q.1 The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is____.

A. More

B. Less

C. Same

D. None of the above

Ans-: A

Q.2 fuel oil consumption guarantees for I.C. engine are usually based on ___.

A. High heat value of oil

B. Low heat value of oil

C. Net calorific value of oil

D. All of the above

Ans-: A

Q.3 In I.C. engine the ratio of volume of air in cylinder before compression stroke and after compression stroke is known as __.

A. Expansion ratio

B. Compression ratio

C. Efficiency of engine

D. Air- fuel ratio

Ans-: B

Q.4 if the intake air temperature of IC engine increases, its efficiency will ?

A. Decreases

B. Increases

C. Same

D. Depends on other factor

Ans-: A

Q.5 An engine indicator is used to determine the following

A. Temperature

B. Speed

C. M.e.p. and I.H.P.

D. BHP

Ans-: C

Q.6 the requirement of a petrol engine during starting compared to theoretical air required for complete combustion is__.

A. Same

B. More

C. Loss

D. Variable

Ans-: C

Q.7 which of the following is not an internal combustion engine?

A. 2 stroke and 4 stroke engine

B. Steam engine

C. Diesel engine

D. Gas turbine

Ans-: B

Q.8 as a result of detonation in an IC engine, following parameter attains very high value.

A.  Rate of rise of temperature

B. Rate of rise of pressure

C. Peak Temperature

D. Peak  pressure

Ans-: B

Q.9 in diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of ___.

A. 500° C

B. 1500 ° C

C. 2000° C

D. 1000 ° C

Ans-: D

Q.10 The precess of breaking up or a liquid into fine droplets by spraying is called?

A. Atomisation

B. Ionisation

C. Carburetion

D. Vaporization

Ans-: A

Q.11 The camshaft of a four stroke IC engine running at 15,00 RPM will run at _____ rpm.

A. 1500

B. 3000

C. 750

D. 1250

Ans-: C

Q.12 result for supercharging in any engine is to ?

A. Reduce weight and bulk for a given output

B. Increase efficiency

C. Decrease efficiency

D. All of the above

Ans-: A

Q.13 The Magneto uesd in an automobile is basically ___.

A. Capacitor

B. A.C. generator

C. Transformer

D. D.C. generator

Ans-: D

Q.14 in a cycle The Spark lasts roughly for

A. 0.001 sec

B. 0.01 sec

C. 0.1 sec

D. 1.0 sec

Ans-: A

Q.15 The specific fuel consumption of petrol engine compared to diesel engine of same H.P. is 

A. Same

B. Less

C. More

D. Depends on operating conditions

Ans-: C

Q.16 The size of inlet valve of an engine in comparison to exhaust valve is

A. Less

B. More

C. Same

D. Depends on engine 

Ans-: A

Q.17 The minimum cranking speed in case of petrol engine is about

A. 100 to 150 RPM

B. 250 to 350 RPM

C. 60 to 80 RPM

D. 10 to 20 RPM

Ans-: C

Q.18 the fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean air filter will be

A. Lower

B. Higher

C. Same

D. Unaffected

Ans-: B

Q.19 Engine Pistons are usually made of aluminium alloy because it is___.

A. Less wear

B. Absorb shock

C. Lighter

D. Stronger

Ans-: C

Q.20 Air fuel ratio for idling speed of a petrol engine is approximately

A. 1 : 1

B. 1 : 10

C. 2 : 1

D. 10 : 1

Ans-: D

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