171B/C/S-4/4/E
PAPER -1
MECHANIC MOTOR VEHICLE
(THEORY)
SEMESTER - IV
TIME: 3 HRS. MARKS: 150
Note: Attempt all questions.
All questions carry equal marks.
This paper carries negative marking. 25% marks will be deducted for each wrong answer.
Choose the correct answer.
1. Spark ignition engine works on
a) Otto cycle b) Diesel Cycle c) Rankine Cycle d) Carnot's Cycle
2. The thermal efficiency of petrol engine is about
3. In S.I engine the fuel is ignited by
a) The heat of the compressed air b) The heat of air and gasoline mixture
c) Spark from the Spark plug d) Any other source
4. In a four stroke cycle engine, the four processes in a cycle namely suction, compression, power (expansion) and exhaust are completed inrevolutions of crankshaft.
a) One b) Two c) Three d) Four
5. In a 4 — stroke engine the spark initiated to the combustion chamber by the spark plug at the end ofstroke.
a) Suction b) Compression c) Power d) Exhaust
6. Generally the compression ratio of 4 — stroke S.I. engine is
b) 12 to 15 : 1 c) 16 to 22 : 1 d) 23 to 30 : 1
7. Which is the hottest portion of the poppet valve during operation of S.I engine?
a) Valve face b) Valve head c) Valve stem d) Valve neck
8. Which ofthe following gets drive from the engine cam shaft?
a) Distributor b) Mechanical fuel pump
c) Oil pump d) All of these
9. The material extending downward in a piston is called as
a) Skirt b) Crown c) Land d) Ring grooves
10. The ignition quality of petrol is determined by
Detonation Octane number Pre-ignition d) Cetane number
Contd. ..2/-
l l . One of the effect of detonation is
a) Low quality of air fuel mixture b) Delay in ignition
c) Loss of power d) Blockage of oil galleries
12. The two stroke cycle engine has
a) One intake valve and one exhaust valve operated by one cam
b) One intake valve and one exhaust valve operated by two cam
c) Only ports, covered and uncovered by piston to effect charging and exhausting
d) None of these
13. The lean air fuel mixture is required for
a) Starting b) Idling c) Cruising
14. The carburetor provides correct amount of air fuel mixture during d) Acceleration
a) Starting b) Idling c) Accelerating
15. The most commonly used carburetor is d) All of these
a) Up-draft type b) Horizontal type c) Down-draft type d) None of these
16. The most accurate petrol injection system is
a) Direct injection b) Manifold injection
c) Port injection d) Throttle body injection
17. The purpose of Knock Sensor used in EFI system to detect the noise, and to reduce the knock automatically by
a) Advancing ignition timing b) Retarding ignition timing
c) Increasing fuel supply d) Decreasing fuel supply
18. In EFI system the exhaust gas sensor senses the percentage in exhaust gas for calculating air-fuel ratio.
a) NOX b) CO c) 02
19. For cold starting of EFI system engine, what is the arrangement for providing rich mixture?
a) A separate injector is fitted to the induction manifold
b) Exhaust valve lifter arrangement
c) Enroid-capsule arrangement in the induction manifold
d) None of these
a) Copper wire b) Fuse c) Switch
22. To measure current in a circuit, the ammeter is connected in
Series Parallel Either (a) or (b) d) Light
d) Both (a) & (b)
20. Which of the following component, in EFI system, decides the amount of fuel to be injected on the basis of signals received from the wide range of sensors?
a) ECU b) Carburettor c) Throttle
21. Which of the following becomes a load in an elecü•ical circuit? d) Governor
Contd...3/-
23. The components of secondary ignition circuit include the secondary winding of ignition coil, distributor rotor, distributor cap and
a) Condenser b) Spark plugs
c) Ignition switch d) distributor drive gear
24. Which of the following is not an electronic ignition system?
a) Transistorized Ignition system b) Capacitor discharge ignition system
c) Magneto ignition system d) Computer controlled direct ignition system
25. The centrifugal advance mechanism operates when engine
a) Load changes b) Speed changes c) Both (a) & (b) d) None of these
26. If the length of the spark plug threaded section is less, than it is called as spark plug.
a) Long reach b) Short reach c) Cold d) Hot
27. The function of generator is that it
a) Converts battery' s direct current in to alternating current
b) Changes mechanical energy into electrical energy
c) Changes magnetism into electricity
d) Generates direct current and gives alternating current as output
28. In an alternator, the magnetic field is produced in the
a) Rotor b) Stator c) Frarne d) Regulator
29. The number of windings in the stator of an alternator is
30. Alternating current produced by alternator (AC generator) is converted to DC by
a) Stator b) Brushes c) Rectifier d) Regulator
31. The field winding in the starter motor are wound around
a) Armature b) Pole — shoes c) Commutator d) Brush
32. The basic purpose of the over running clutch in the starter drive is to
a) Assist the solenoid during cranking
b) Pull the starter gear out of mesh
c) Disengage the armature when the engine starts
d) Keep the hold in winding energized during cranking
33. If the engine cranks too slow to start, the problem may be caused by
a) Engine problem b) A faulty neutral start switch
c) An open relay in the control circuit d) A damaged pinion gear
34. The colour of indicator light is
White Amber Green
d) Blue
Contd. . . 4/-
35. In a head light, the metal shield is placed below the
a) Dipped beam b) Main beam c) Both of the beams d) None of these
36. In modem vehicles, the head light dipper switch is mounted on the
a) Dash board b) Floor c) Side panel d) Steering column
37. For aiming the head light beam in conventional method, the distance between the head light and screen should be
a) 1.5 m b) 4.6 m c) 7.6 m d) 10.5 m
38. In a fuel tank, when the float is near the top of the tank, the resistance in the fuel gauge circuit is
a) Small/minimum b) High/maximum c) Always same d) None of these
39. A 12 volts windshield wiper motor consumes aboutamps. of current under normal operation.
a) O- 1 c) 10- 15 d) 20 30
40. The frequency of flashing light per minute in a turn indicator is about
b) 80 c) 800 d) None of these
41. Which of the following indicates the correct standard direction of refrigerant flow in an air- conditioner?
a) Compressor — Receiver/Drier — Condenser — Expansion valve — Evaporator
b) Compressor — Expansion valve — Receiver/Drier Condenser — Evaporator
c) Compressor — Evaporator — Expansion valve — Receiver/Drier — Condenser
d) Compressor — Condenser — Receiver/Drier — Expansion valve - Evaporator
42. Which of the following is basic purpose of air conditioning system?
a) Temperature control b) Humidity control
c) Air purification and circulation control d) All of these
43. The use of refrigerant 'R — 12' has been banned because
a) R — 12 is inflammable
b) CFCs (Chloro Floro Carbons) are difficult to produce in volumes.
c) CFCs lead to the destruction of the ozone layer
d) A large amount of ozone is needed to produce R — 12 refregerant
44. Which of the following statement is correct with regard to the expansion valve?
a) It converts high-temperature, high-pressure vapour refrigerant into low-temperature, low-pressure liquid
b) It converts high-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure mist
c) It controls the amount and the temperature of the refrigerant flowing into the evaporator
d) It prevents the evaporator from freezing
Contd.. .5/-
45. Which of the following sensor data will the automatic air-conditioning system use to operate the compressor clutch?
a) Engine coolant temperature
b) Battery voltage
c) In-car and outside air temperature
d) Evaporator temperature and in-car temperature
46. Ignition warning light indicates
a) Oil pressure b) Sparking c) Oil temperature d) Poor combustion
47. The advantage of electrical fuel pump is
a) It can be fitted near to engine with long suction pipe length
b) It can be fitted near to fuel tank with short suction pipe length
c) Engine is required to be started to operate the pump
d) All of the above
48. The important parameter that can be controlled by electronic engine management system
are
a) Air fuel ratio b) Ignition and injection timing
c) Idle speed d) All of these
49. As per service manual, it is mandatory to check the level of gear box and differential oil
once.
a) Daily b) Weekly c) Fortnightly d) Monthly
50. Which of the following does not come under vehicle safety technology?
a) Roll-over prevention b) Remote key less entry system circuit
c) Night vision Assist d) ABS
PAPER -1
MECHANIC MOTOR VEHICLE
(THEORY)
SEMESTER - IV
TIME: 3 HRS. MARKS: 150
Note: Attempt all questions.
All questions carry equal marks.
This paper carries negative marking. 25% marks will be deducted for each wrong answer.
Choose the correct answer.
1. Spark ignition engine works on
a) Otto cycle b) Diesel Cycle c) Rankine Cycle d) Carnot's Cycle
2. The thermal efficiency of petrol engine is about
3. In S.I engine the fuel is ignited by
a) The heat of the compressed air b) The heat of air and gasoline mixture
c) Spark from the Spark plug d) Any other source
4. In a four stroke cycle engine, the four processes in a cycle namely suction, compression, power (expansion) and exhaust are completed inrevolutions of crankshaft.
a) One b) Two c) Three d) Four
5. In a 4 — stroke engine the spark initiated to the combustion chamber by the spark plug at the end ofstroke.
a) Suction b) Compression c) Power d) Exhaust
6. Generally the compression ratio of 4 — stroke S.I. engine is
b) 12 to 15 : 1 c) 16 to 22 : 1 d) 23 to 30 : 1
7. Which is the hottest portion of the poppet valve during operation of S.I engine?
a) Valve face b) Valve head c) Valve stem d) Valve neck
8. Which ofthe following gets drive from the engine cam shaft?
a) Distributor b) Mechanical fuel pump
c) Oil pump d) All of these
9. The material extending downward in a piston is called as
a) Skirt b) Crown c) Land d) Ring grooves
10. The ignition quality of petrol is determined by
Detonation Octane number Pre-ignition d) Cetane number
Contd. ..2/-
l l . One of the effect of detonation is
a) Low quality of air fuel mixture b) Delay in ignition
c) Loss of power d) Blockage of oil galleries
12. The two stroke cycle engine has
a) One intake valve and one exhaust valve operated by one cam
b) One intake valve and one exhaust valve operated by two cam
c) Only ports, covered and uncovered by piston to effect charging and exhausting
d) None of these
13. The lean air fuel mixture is required for
a) Starting b) Idling c) Cruising
14. The carburetor provides correct amount of air fuel mixture during d) Acceleration
a) Starting b) Idling c) Accelerating
15. The most commonly used carburetor is d) All of these
a) Up-draft type b) Horizontal type c) Down-draft type d) None of these
16. The most accurate petrol injection system is
a) Direct injection b) Manifold injection
c) Port injection d) Throttle body injection
17. The purpose of Knock Sensor used in EFI system to detect the noise, and to reduce the knock automatically by
a) Advancing ignition timing b) Retarding ignition timing
c) Increasing fuel supply d) Decreasing fuel supply
18. In EFI system the exhaust gas sensor senses the percentage in exhaust gas for calculating air-fuel ratio.
a) NOX b) CO c) 02
19. For cold starting of EFI system engine, what is the arrangement for providing rich mixture?
a) A separate injector is fitted to the induction manifold
b) Exhaust valve lifter arrangement
c) Enroid-capsule arrangement in the induction manifold
d) None of these
a) Copper wire b) Fuse c) Switch
22. To measure current in a circuit, the ammeter is connected in
Series Parallel Either (a) or (b) d) Light
d) Both (a) & (b)
20. Which of the following component, in EFI system, decides the amount of fuel to be injected on the basis of signals received from the wide range of sensors?
a) ECU b) Carburettor c) Throttle
21. Which of the following becomes a load in an elecü•ical circuit? d) Governor
Contd...3/-
23. The components of secondary ignition circuit include the secondary winding of ignition coil, distributor rotor, distributor cap and
a) Condenser b) Spark plugs
c) Ignition switch d) distributor drive gear
24. Which of the following is not an electronic ignition system?
a) Transistorized Ignition system b) Capacitor discharge ignition system
c) Magneto ignition system d) Computer controlled direct ignition system
25. The centrifugal advance mechanism operates when engine
a) Load changes b) Speed changes c) Both (a) & (b) d) None of these
26. If the length of the spark plug threaded section is less, than it is called as spark plug.
a) Long reach b) Short reach c) Cold d) Hot
27. The function of generator is that it
a) Converts battery' s direct current in to alternating current
b) Changes mechanical energy into electrical energy
c) Changes magnetism into electricity
d) Generates direct current and gives alternating current as output
28. In an alternator, the magnetic field is produced in the
a) Rotor b) Stator c) Frarne d) Regulator
29. The number of windings in the stator of an alternator is
30. Alternating current produced by alternator (AC generator) is converted to DC by
a) Stator b) Brushes c) Rectifier d) Regulator
31. The field winding in the starter motor are wound around
a) Armature b) Pole — shoes c) Commutator d) Brush
32. The basic purpose of the over running clutch in the starter drive is to
a) Assist the solenoid during cranking
b) Pull the starter gear out of mesh
c) Disengage the armature when the engine starts
d) Keep the hold in winding energized during cranking
33. If the engine cranks too slow to start, the problem may be caused by
a) Engine problem b) A faulty neutral start switch
c) An open relay in the control circuit d) A damaged pinion gear
34. The colour of indicator light is
White Amber Green
d) Blue
Contd. . . 4/-
35. In a head light, the metal shield is placed below the
a) Dipped beam b) Main beam c) Both of the beams d) None of these
36. In modem vehicles, the head light dipper switch is mounted on the
a) Dash board b) Floor c) Side panel d) Steering column
37. For aiming the head light beam in conventional method, the distance between the head light and screen should be
a) 1.5 m b) 4.6 m c) 7.6 m d) 10.5 m
38. In a fuel tank, when the float is near the top of the tank, the resistance in the fuel gauge circuit is
a) Small/minimum b) High/maximum c) Always same d) None of these
39. A 12 volts windshield wiper motor consumes aboutamps. of current under normal operation.
a) O- 1 c) 10- 15 d) 20 30
40. The frequency of flashing light per minute in a turn indicator is about
b) 80 c) 800 d) None of these
41. Which of the following indicates the correct standard direction of refrigerant flow in an air- conditioner?
a) Compressor — Receiver/Drier — Condenser — Expansion valve — Evaporator
b) Compressor — Expansion valve — Receiver/Drier Condenser — Evaporator
c) Compressor — Evaporator — Expansion valve — Receiver/Drier — Condenser
d) Compressor — Condenser — Receiver/Drier — Expansion valve - Evaporator
42. Which of the following is basic purpose of air conditioning system?
a) Temperature control b) Humidity control
c) Air purification and circulation control d) All of these
43. The use of refrigerant 'R — 12' has been banned because
a) R — 12 is inflammable
b) CFCs (Chloro Floro Carbons) are difficult to produce in volumes.
c) CFCs lead to the destruction of the ozone layer
d) A large amount of ozone is needed to produce R — 12 refregerant
44. Which of the following statement is correct with regard to the expansion valve?
a) It converts high-temperature, high-pressure vapour refrigerant into low-temperature, low-pressure liquid
b) It converts high-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure mist
c) It controls the amount and the temperature of the refrigerant flowing into the evaporator
d) It prevents the evaporator from freezing
Contd.. .5/-
45. Which of the following sensor data will the automatic air-conditioning system use to operate the compressor clutch?
a) Engine coolant temperature
b) Battery voltage
c) In-car and outside air temperature
d) Evaporator temperature and in-car temperature
46. Ignition warning light indicates
a) Oil pressure b) Sparking c) Oil temperature d) Poor combustion
47. The advantage of electrical fuel pump is
a) It can be fitted near to engine with long suction pipe length
b) It can be fitted near to fuel tank with short suction pipe length
c) Engine is required to be started to operate the pump
d) All of the above
48. The important parameter that can be controlled by electronic engine management system
are
a) Air fuel ratio b) Ignition and injection timing
c) Idle speed d) All of these
49. As per service manual, it is mandatory to check the level of gear box and differential oil
once.
a) Daily b) Weekly c) Fortnightly d) Monthly
50. Which of the following does not come under vehicle safety technology?
a) Roll-over prevention b) Remote key less entry system circuit
c) Night vision Assist d) ABS
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