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