Practice Test: Question Set - 11
1. The reflectivity depends upon
- (A) Geometry
of the reflector
- (B) Energy
of neutrons
- (C) Properties
of the reflector
- (D) All
of these
2. The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be
- (A) Higher
- (B) Lower
- (C) Remain unaffected
- (D) None of the above
3. The sensing element in the control system of nuclear reactors measures the _________ of the neutron flux in the reactor.
- (A) Temperature
- (B) Volume
- (C) Density
- (D) None of
these
4. Pick up the wrong statement
- (A) 2-stroke engine can run in any direction
- (B) In 4-stroke engine, a
power stroke is obtained in 4-strokes
- (C) Thermal efficiency of
4-stroke engine is more due to positive scavenging
- (D) Petrol engines occupy
more space than diesel engines for same power output
5. If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is
- (A) V₁ / (V₀ + V₁)
- (B) V₀ / (V₀ + V₁)
- (C) 2V₀ / (V₀ + V₁)
- (D) 2V₁ / (V₀ + V₁)
6. In a cycle, the spark lasts roughly for
- (A) 1 sec
- (B) 0.1 sec
- (C) 0.01 sec
- (D) 0.001 sec
7. Which of the following does not relate to a compression ignition engine?
- (A) Fuel
pump
- (B) Fuel
injector
- (C) Governor
- (D) Carburettor
8. Air fuel ratio for idling speed of a petrol engine is approximately
- (A) 1 : 1
- (B) 5 : 1
- (C) 10 : 1
- (D) 15 : 1
9. The advancing of spark timing in spark ignition engines will _________ knocking tendency.
- (A) Increase
- (B) Reduce
- (C) Not effect
- (D) None of
these
10. The fuel in diesel engine is normally injected at pressure of
- (A) 5-10 kg/cm²
- (B) 20-25 kg/cm²
- (C) 60-80 kg/cm²
- (D) 90-130 kg/cm²
11. A mixture containing 65% of iso-octane and 35% of normal heptane will have
- (A) Cetane
number 65
- (B) Octane
number 65
- (C) Cetane
number 35
- (D) Octane
number 35
12. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will
- (A) Increase
- (B) Decrease
- (C) Be independent
- (D) May increase or
decrease depending on other factors
13. Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
- (A) Half
- (B) Same
- (C) Double
- (D) Four
times
14. The calorific value of gaseous fuels is expressed in terms of
- (A) kcal
- (B) kcal/kg
- (C) kcal/m²
- (D) kcal/m3
15. The pressure at the end of compression, in diesel engines, is approximately
- (A) 10 bar
- (B) 20 bar
- (C) 25 bar
- (D) 35 bar
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