i c engines MCQs – Page 3

A. 0.01 sec

B. 0.0001 sec

D. 1 sec

E. 0.1 sec

B. less than 100C

C. between 100-250C

D. between 400 500C

E. between 500 1000C

A. reactive mixture

B. high temperature

C. high density

D. short delay

A. proper self ignition temperature

B. lower self ignition temperature

C. none of the above

E. self ingition temperature has nothing to do with detonation

A. 0.3 kg/hr

C. 3 kg/hr

D. 5 kg/hr

E. 10 kg/hr

A. temperature at which it catches fire without external aid

B. temperature at which it solidifies or congeals

D. indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

E. none of the above

A. burnt air containing products of combustion

C. forced air for cooling cylinder

D. air fuel mixture

E. air used for combustion sent under pres-sure

A. 350 450C

B. 30 65C

D. 450-550C

E. 65 220C

A. depend on other factors

C. decrease

D. remain unaffected

E. none of the above

A. ch of the following is false statement?

A. regulate power

B. distribute charge, equally to all the cylinders

C. feed lub oil to all moving parts

D. inject fuel at appropriate time

A. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

C. fuel is injected at atmospheric pressure

D. there are no valves.

E. only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

A. decrease upto certain limit and then in-crease

B. decrease

C. increase upto certain limit and then decrease

E. remain same

A. none of the above

C. improper mixing of air and fuel

D. self ignition temperature has nothing to do with detonation

E. improper combustion

A. ignition coil, contact breaker and con-denser

B. ignition coil

D. ignition coil and contact breaker

E. ignition coil and condenser

A. the engine is rarely operated

B. the friction is unpredictable

C. none of the above

E. the friction is high

A. 13

B. 16

C. 5

D. 10

A. volume of cylinder

B. speed

C. BHP

D. temperature

A. mean heat value of oil

B. calorific value of oil

C. low heat value of

E. all of the above

A. as a defrosting agent

B. as a superior type of fluid compared to others

C. to increase the cetane rating of the fuel

E. to improve lubricating quality of fuel

A. remain unaffected

C. none of the above

D. lower

E. unpredictable

A. 450-550C

B. 220-350C

C. 350-450C

E. 30 65C

A. upto 75%

B. upto 25%

C. upto 35%

D. upto 50%

A. peak temperature

C. rate of rise of temperature

D. peak pressure

E. rate of rise of horse-power

A. injector

B. governor

C. fuel pump

E. scavenging

A. lean mixture

C. theoretically correct mixture

D. lean/rich mixture depending upon capacity of engine

E. any type of mixture

A. leading ring

B. oil ring

D. scrapper ring

E. groove ring

A. may open or close anywhere

B. opens at top dead center and closes at bottom dead center

D. opens at 10 after top dead center and closes 20 before the bottom dead center

E. remains open for 200.

B. 15:01

C. 5:01

D. 1:01

E. 20:01

A. increase in clearance volume caused b bearing-bushing wear

B. clogged air-inlet slots

C. leaking piston rings

E. use of thick head gasket

A. using additives in the fuel

B. engine derating i.e. reducing the maxi-mum flow of fuel

C. adherence to proper fuel specification

D. avoidance of overloading

A. unpredictable

B. less

C. more or less depending on power rating

E. same

A. homogeneous

C. both A. and B.

D. laminar

E. turbulent

A. 18:01

B. 9:01

C. 20:01

D. 15:01

A. time before actual fuel injection and the pump plunger starts to pump fuel

B. time corresponding to actual injection and top dead center

C. none of the above

E. time corresopnding to actual ingition and top dead center

A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

B. temperature at which it flows easily

C. temperature at which it solidifies or congeals

D. it catches fire without external aid

B. diesel

C. lub oil

D. kerosene

E. fuel oil

A. exhaust valve opens at bottom dead center and closes at top dead center

C. exhaust valve opens just after bottom dead center and closes just before top dead center

D. may open and close anywhere

E. none of the above is true

A. 20-25 kg/cm2

B. 150-250 kg/cm2

D. 60-80 kg/cm2

E. 5-10 kg/cm2

A. increasing flywheel size

C. scavenging

D. heating incoming air

E. feeding more fuel

A. smaller

B. gaseous

D. liquid

E. slowed down

A. nit and miss governing

B. combined governing

C. quantity governing

E. partial governing

A. may increase or decrease depending on other factors

B. be independent

C. none of the above

D. increase

B. 1 valve

C. 2 valves

D. no valve

E. 4 valves

A. transformer

B. capacitor

C. a.c. generator

E. magnetic circuit

B. SAE 4

C. SAE 50

D. SEA 30

E. SAE 70

B. naturally aspirated

C. centrifugal pump

D. turbo charger

E. none of the above

A. supercharging is essential in aircraft engines

B. there can be limited supercharging in petrol engines because of detonation

C. supercharging reduces knocking in diesel engines

D. supercharging at high altitudes is essential

A. unpredictable

B. increase or decrease knocking tendency depedning on strength and time of spark

C. not affect the knocking tendency

D. decrease the knocking tendecny

A. knock

B. detonate

C. give lot of smoke

D. run for some time and then stop