1. Which is the most effective air cleaner in the case of diesel engines?
a) dry type
b) wet type
c) whirl type
d) oil bath type
Explanation: Oil bath type is the most effective air cleaner in case of diesel engines.
2. A high flame speed is obtained in diesel engine when air fuel ratio is ____________
a) uniform throughout the mixture
b) chemically correct mixture
c) about 3-5% rich mixture
d) about 10% rich mixture
Explanation: When air fuel ratio is about 10% rich mixture, then a high flame speed is obtained in diesel engine.
3. During idling, a petrol engine requires ______________ mixture.
a) lean
b) rich
c) chemically correct
d) none of the mentioned
Explanation: Rich mixture is required by a petrol engine when it is in idling condition.
4. The ___________ engines can work on very lean mixture of fuel.
a) spark ignition
b) compression ignition
c) spark & compression ignition
d) none of the mentioned
Explanation: Only the compression ignition engines can work on very lean mixture of fuel while spark ignition requires a richer mixture.
5. In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then ______________ is employed.?
a) fuel pump
b) injector
c) carburetor
d) none of the mentioned
Explanation: carburetor
6. A simple carburetor supplies a rich mixture during ___________
a) starting
b) idling
c) cruising
d) accelerating
Explanation: A simple carburetor supplies a rich mixture during accelerating
7. The size of a carburetor is generally given in terms of the diameter of the ______________ in mm.
a) venturi tube
b) jet
c) nozzle
d) none of the mentioned
Explanation: The size of the carburetor is generally given in terms of the diameter of the venturi tube in mm.
8. A decrease in the density of air ______________ the value of air-fuel ratio.
a) increases
b) reduces
c) equals
d) none of the mentioned
Explanation: Generally, a decrease in the density of air reduces the value of air-fuel ratio.
9. Venturi tube is also known as ___________
a) choke tube
b) throat
c) nozzle
d) none of the mentioned
Explanation: Venturi tube is also known as throat
10. The pressure difference between the float chamber and the throat of the venturi is known as ___________
a) carburetor expansion
b) carburetor acceleration
c) carburetor depression
d) none of the mentioned
Explanation: Carburetor depression is defined as the pressure difference between the float chamber and the throat of the venturi.