1. In carburetors, 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
Explanation: slightly higher level
2. Carburetion is done to ____________
a) feed petrol into cylinder
b) govern the engine
c) break up and mix the petrol with air
d) none of the mentioned
Explanation: The purpose of carburetion is to break up and mix the petrol with air.
3. Power impulses from IC engine are smoothed out by ____________
a) governor
b) crank shaft
c) gear box
d) flywheel
Explanation: Power impulses from IC engine are smoothed out by flywheel as the energy is stored in the flywheel.
4. Which of the following type of carburetor is preferred?
a) concentric type
b) eccentric type
c) horizontal type
d) vertical type
Explanation: Concentric type of carburetor is preferred as it gives a better fuel ratio.
5. In the passenger cars, which of the following type of carburetor is preferred?
a) horizontal type
b) downward draught type
c) upward draught type
d) none of the mentioned
Explanation: In the passenger cars, a downward draught type of carburetor is preferred to meet the load fuel ratio.
6. What is the part load efficiency of a carburetor?
a) maximum
b) optimum
c) poor
d) constant
Explanation: poor
7. Air injected in IC engines refers to injection of ____________
a) air only
b) liquid fuel only
c) liquid fuel and air
d) none of the mentioned
Explanation: Liquid fuel and air are injected in IC engines.
8. The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The m.e.p. is maximum in the zone of ____________
a) lean mixture
b) chemically correct mixture
c) rich mixture
d) none of the mentioned
Explanation: The m.e.p. is maximum in the zone of rich mixture.
9. The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in air fuel ratio. The maximum value occurs in the range of ____________
a) lean mixture
b) chemically correct mixture
c) rich mixture
d) none of the mentioned
Explanation: The maximum value occurs in the range of lean mixture.
10. Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The maximum value occurs in the region of ____________
a) lean mixture
b) chemically correct mixture
c) rich mixture
d) none of the mentioned
Explanation: The maximum value occurs in the region of chemically correct mixture.