IC Engines Mcqs - Set 9

1)   Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?

a. increases
b. decreases
c. remains same
d. unpredictable
e. none of the above
Answer  Explanation 

ANSWER: decreases

Explanation:
No explanation is available for this question!


2)   The cooling water requirement for diesel engine is of the order of________________?

a. 0.2 to 1.0 liter per minute per h.p.
b. 1 to 3 liters per minute per h.p.
c. 5 to 10 liters per minute per h.p
d. 10 to 20 liters per minute per h.p.
e. 20-30 liters per minute per h.p
Answer  Explanation 

ANSWER: 1 to 3 liters per minute per h.p.

Explanation:
No explanation is available for this question!


3)   Ignition timing of a multicylider petrol engine can be adjusted by_________________?

a. rotating the crank
b. adjusting the spark plug gap
c. adjusting ignition coil position
d. rotating the distributor
e. delaying the spark by increasing capacitor in ignition circuit
Answer  Explanation 

ANSWER: rotating the distributor

Explanation:
No explanation is available for this question!


4)   High carbon content in diesel oil used for diesel engine leads to_________________?

a. production of highly corrosive gases corroding the cylinder walls and exhaust system
b. excessive engine wear
c. damaging of both the storage tank and the engine
d. deposition on engine parts
e. none of the above
Answer  Explanation 

ANSWER: deposition on engine parts

Explanation:
No explanation is available for this question!


5)   The pour point of diesel oil must be_________________?

a. lower than the coldest atmospheric temperature at which oil is to be pumped
b. higher than above
c. has no such relation
d. more than 100°C
e. none of the above
Answer  Explanation 

ANSWER: lower than the coldest atmospheric temperature at which oil is to be pumped

Explanation:
No explanation is available for this question!


6)   In petrol engine, increase of cooling water temperature will_________________?

a. increase the knocking tendency
b. decrease the knocking tendecny
c. not affect the knocking tendency
d. increase or decrease knocking tendency depedning on strength and time of spark
e. unpredictable
Answer  Explanation 

ANSWER: increase the knocking tendency

Explanation:
No explanation is available for this question!


7)   In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?

a. 0.85
b. 1
c. 1.1 to 1.3
d. 1.2 to 1.5
Answer  Explanation 

ANSWER: 1.1 to 1.3

Explanation:
No explanation is available for this question!


8)   In carburettors, the top of the fuel jet with reference to the level in the float chamber is kept at_________________?

a. same level
b. slightly higher level
c. slightly lower level
d. may be anywhere
e. varies from situation to situation
Answer  Explanation 

ANSWER: slightly higher level

Explanation:
No explanation is available for this question!


9)   Power impulses from an I.C. engine are somoothed out by__________________?

a. governor
b. crank shaft
c. gear box
d. flywheel
e. timing spark properly
Answer  Explanation 

ANSWER: flywheel

Explanation:
No explanation is available for this question!


10)   For low speed operation or for idling in petrol engines, the engine requirements are for_______________?

a. lean mixture
b. theoretically correct mixture
c. rich mixture
d. any type of mixture
e. lean/rich mixture depending upon capacity of engine
Answer  Explanation 

ANSWER: rich mixture

Explanation:
No explanation is available for this question!


11)   The essential equipment for producing high vlotage for sparking in petrol engines with battery is_______________?

a. ignition coil
b. ignition coil and distributor
c. ignition coil and condenser
d. ignition coil and contact breaker
e. ignition coil, contact breaker and con-denser
Answer  Explanation 

ANSWER: ignition coil and distributor

Explanation:
No explanation is available for this question!


12)   In petrol engines, advancing the spark timing will_______________?

a. increase the knocking tendency
b. decrease the knocking tendency
c. not affect the knocking tendncy
d. increase or decrease knocking tendency depending on strenght and time of spark
e. unpredictable
Answer  Explanation 

ANSWER: increase the knocking tendency

Explanation:
No explanation is available for this question!


13)   The ignition coil in diesel engines produces voltage of the order of________________?

a. 6 to 12 volts
b. 240 volts
c. 1000 volts
d. 20,000 volts
e. 80,000 volts
Answer  Explanation 

ANSWER: 20,000 volts

Explanation:
No explanation is available for this question!


14)   The thermal efficiency of a diesel engine is of the order of_________________?

a. 92%
b. 68%
c. 52%
d. 34%
e. 25%
Answer  Explanation 

ANSWER: 34%

Explanation:
No explanation is available for this question!


15)   Theoretically, the following engine should have maximum efficiency________________?

a. gas engine
b. 2-stroke S.I. engine
c. 4-stroke S.I. engine
d. steam engine
e. 4-stroke C.I. engine
Answer  Explanation 

ANSWER: 4-stroke C.I. engine

Explanation:
No explanation is available for this question!


16)   In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?

a. increase the knocking tendency
b. decrease the knocking tendency
c. not affect the knocking tendency
d. increase or decrease knocking tendency depending on strength and time of spark
e. unpredictable
Answer  Explanation 

ANSWER: increase the knocking tendency

Explanation:
No explanation is available for this question!


17)   In open combustion chamber in diesel engines____________________?

a. the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
b. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
c. 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
d. fuel is injected at atmospheric pres¬sure
e. there are no valves
Answer  Explanation 

ANSWER: the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture

Explanation:
No explanation is available for this question!


18)   Which of the following engines can work on very lean mixture__________________?

a. S.I. engine
b. C.I. engine
c. two stroke engine
d. four stroke engine
e. all of the above
Answer  Explanation 

ANSWER: C.I. engine

Explanation:
No explanation is available for this question!


19)   Hot air standard diesel cycle efficiency with increase in value of C„_______________?

a. increases
b. decreases
c. remains unaffected
d. depends on other factors
e. unpredictable
Answer  Explanation 

ANSWER: decreases

Explanation:
No explanation is available for this question!


20)   For low load operation, more suitable (economical) engine is_______________?

a. S.I. engine
b. C.I. engine
c. both are equally good
d. multicylinder engine
e. two stroke engine
Answer  Explanation 

ANSWER: C.I. engine

Explanation:
No explanation is available for this question!