| Post Name | Junior Instructor (Mechanic Auto Electrical and Electronics) |
|---|---|
| Department | Industrial Training |
| Question Paper Code | 002/2023 |
| Category Code | 461/2021 |
| Date of Test | 7 January 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
____________ is used to check warpage of an engine cylinder head.
Answer
A. Straight edge ruler
2
An odometer is an instrument used to measure ___________ in automobiles.
Answer
D. distance
3
Which type of fire extinguisher is used for fire due to liquids ?
Answer
B. class B
4
The maximum ignition advance by vacuum advance mechanism is 15 to 30
crankshaft degrees.
Answer
C. only 3 and 4
5
The measuring device used to find the thickness of sheet metals is
Answer
B. Wire gauge
6
A bolt of M24 × 2 means that
Answer
B. the nominal diameter of the bolt is 24 mm and the pitch is 2 mm
7
The difference between the upper limit and lower limit of a dimension is called
Answer
C. Tolerance
8
Which type of personal protective item can be used to protect eyes ?
Answer
B. Goggles
9
Which type of Energy Conservation Opportunity (ECOs) involves stopping of water
leakage points ?
Answer
D. Minor energy conservation opportunities
10
The process for enlarging or finishing a previously drilled hole is known as
Answer
B. Reaming
11
Read the statements given below and choose the correct option.
Statement
Answer
C. Both statements are correct
12
A two stroke engine is normally equipped with a
Answer
C. reed valve
13
Connecting rod connects crankshaft and the
Answer
D. Piston
14
Vibration damper is mounted on
Answer
A. the front end of the crankshaft
15
Choose the correct statement.
Answer
B. the size of the inlet valve is more
16
The purpose of the thermostat is to keep the engine
Answer
C. at desired temperature
17
Antiknock quality of gasoline is measured by
Answer
C. octane number
18
Read the statements given below and choose the correct option.
Statement
Answer
A. A plastic scraper can be used any gasket material from the head.
Statement
19
The swept volume of a cylinder in an engine is
Answer
A. cross sectional area × stroke
20
The distance between the centres of the front wheel is called
Answer
C. Track
21
In cars having rack and pinion steering, the gear rack is attached to
Answer
D. tie rod
22
The function of master cylinder is
Answer
A. to increase pressure equally in all cylinders
23
The camber of leaf spring is
Answer
Question Cancelled
24
Slack adjuster is used in air brake system to adjust
Answer
A. Scam
25
Identify which is not a type of frame ?
Answer
B. half-integral frame
26
Which transmission system member among the following helps to vary the leverage
between engine and road wheels ?
Answer
B. Gear box
27
Normal force acting on the friction surface is greater than the axial force in the case
of
Answer
A. Cone clutch
28
Which among the following is not supposed to be operated by the user ?
Answer
C. Centrifugal clutch
29
Gears in sliding mesh gear box are
Answer
D. Spur gears
30
The driving / driver shaft of the gear box is also known as
Answer
A. Clutch shaft
31
The member which multiplies the torque in a torque converter is
Answer
D. Stator
32
In order to accommodate the variation in length, a propeller shaft must have
Answer
B. Slip joint
33
Which of the following member is used to hold the rear axle in position against side
thrust ?
Answer
C. Panhard rod
34
Type of wheel desirable in racing cars is
Answer
A. Magnesium alloy wheel
35
When loading a vehicle, the load distribution should be
Answer
D. Equal at all wheels
36
In modern diesel engines pilot injection is aimed at
Answer
C. Both A and B
37
In CRDI system, the maximum pressure developed by the high pressure pumps is
usually
Answer
B. 1600 bar
38
Switching speed of piezo injector is how many times than that of a solenoid valve
Answer
A. two
39
In petrol electronic fuel injection system, the amount of fuel drawn by the fuel pump is
Answer
D. more than the required
40
Which sensor is used to correct the air density variation with atmospheric temperature ?
Answer
A. MAP sensor
41
Which electronic unit gives signal to control IAC valve ?
Answer
B. ECM
42
How many petrol injection systems are there, according to the duration and timing
of fuel injection ?
Answer
C. Three
43
Compared to First Generation Air Bags, Second Generation Air Bags inflates with
Answer
D. Less force
44
Which type of seat belt operates automatically with no action required by the vehicle’s
occupant ?
Answer
A. Passive restraint
45
A high-speed CAN BUS communicates with a scan tool through which terminal(s) ?
Answer
B. 6 and 14
46
In an Air conditioning system, the subcooled liquid refrigerant flows from the receiver
drier to
Answer
C. Expansion Valve
47
Relative humidity for comfort levels is generally about
Answer
C. 50%
48
The desiccant used inside the receiver for R-134a is
Answer
C. Both A and B
49
Ambient temperature sensor is fitted near the
Answer
C. Condenser
50
The greatest source of refrigerant leakage is
Answer
D. Compressor seal
51
Stoichiometric air fuel ratio of petrol by mass is nearly
Answer
A. 15 : 1
52
Compared to petrol, hydrocarbon emissions for Ethanol as a SI engine fuel is
Answer
B. Less
53
In the case of CI engines, the delay period decreases with
Answer
C. Increase in compression ratio
54
Combustion in the third stage is rapid in the case of
Answer
D. Pre Combustion chamber
55
What is the basic fuel for a fuel cell ?
Answer
A. Hydrogen
56
A 30 �F capacitor is connected across a 400 V supply. If the reactance of the capacitor
is 100 Ohms, the value of the current is
Answer
D. 4A
57
With given details of junction transistor, match the followings :
1. joining P type germanium to N-P junction a. electrons
2. joining N type germanium to P-N junction b. holes
3. charge carriers in PNP junction c. PNP type
4. charge carriers in NPN junction d. NPN type
Answer
D. i-c, 2-d, 3-b, 4a
58
Which of the following statement is/are correct about Field Effect Transistor (FET) ?
1. FET is unipolar.
2. FET is not a majority carrier device.
3. FET is having high impedance and better thermal stability.
4. FET is having low impedance and poor thermal stability.
Answer
A. only 1 and 3
59
Three capacitors have capacitance of 2�F, 4�F and 4�F. The total capacitance when
they are connected i) in parallel and ii) in series respectively is
Answer
B. 10�F and 1�F
60
Zener diodes are available for voltage output control purpose with Zener voltages
range from
Answer
B. 3 to 100 V
61
The applications of phototransistors includes
1. photo-electric counting and speed indication
2. automotive pollution control
3. automotive parking and head light control
4. automotive electronic ignition
Answer
D. 1 and3
62
According to Fleming’s right hand rule, the direction of e.m.f. is represented by
Answer
C. second finger held at right-angle to both the thumb and first finger
63
A conductor carries a current of 1000 A at right-angles to a magnetic field having a
density of 2 T. The force on the conductor with 2 m length is
Answer
D. 4000 N
64
The number of ignition coils required for the eight cylinder V-8 engine with
distributorless ignition is
Answer
Question Cancelled
65
The specific gravity of sulphuric acid of a lead-acid battery at 100% charge, 50%
charge and 0% charge are
Answer
D. 1.28, 1.20 and 1.12
66
Which of the following statement is/are correct about fully charged lead-acid battery ?
1. The active material in positive plate is lead peroxide.
2. The active material in positive plate is sponge lead.
3. The active material in negative plate is sponge lead.
4. The active material in negative plate is lead peroxide.
Answer
A. only 1 and 3
67
The capacity increase of a lead-acid battery with 20-hour rate of discharge than
10-hour rate of discharge is approximately
Answer
Question Cancelled
68
The electrolyte for lead-acid battery is prepared by mixing commercial concentrated
sulphuric acid with distilled water approximately in the proportion of
Answer
B. 3 parts of acid to 8 parts of water
69
For trickle charging of lead-acid battery, the amount of charging rate used should
be
Answer
C. 2 to 5% of normal charging current
70
Match the followings for the ignition coil of automobile ignition system.
a. number of turns in primary winding 1. about 20 S.W.G.
b. number of turns in secondary winding 2. 15,000 to 20,000
c. wire thickness of primary winding 3. about 40 S.W.G.
d. wire thickness of secondary winding 4. 200 to 300
Answer
B. 3,
71
In the battery coil ignition system, expression for the instantaneous value of primary
current is
V� L
� V� Rt
�
Answer
B. i � � 1 � e L �
R� � R� �
R� Rt
� V � RtL �
72
For automotive ignition system, match the followings :
1. spark plug gap a. 0.35 mm to 0.4 mm
2. contact breaker gap b. 0.60 mm to 1 mm
3. dwell angle for 4-cylinder engine Cc. 36° to 42°
4. dwell angle for 6-cylinder engine d. 48° to 52°
Answer
B. 1-b, 2-a, 3d, 4-c
73
With details regarding the spark plug, match the followings :
1. Combustion chamber temperature a. above 750°C
2. Electrode temperature at which
pre-ignition occurs b. 2400°C to 2600°C
3. Electrode temperature at which
carbon or oil deposits c. 500°C to 600°C
4. Optimum electrode temperature d. below 300°C
Answer
A. 1-b, 2-a, 3-d, 4c
74
Which of the following statement is/are correct ?
1. Flywheel magneto runs at the speed of camshaft.
2. Dwell meter is used to measure spark plug gap.
3. Feeler gauge or dwell meter is used to measure contact breaker gap.
4. The maximum ignition advance by vacuum advance mechanism is 15 to 30
crankshaft degrees.
Answer
C. only 3 and 4
75
The types of coil winding used in the armature of generator are
Answer
D. lap and wave winding
76
The output voltage of an alternator not depends on
Answer
D. current regulator
77
In an electromagnet starter motor, the armature windings are made of
Answer
A. many loops of heavy wire
78
The flywheel ring gear has about 15 times as many teeth as the pinion. When starter
motor operates, if the armature spins at 3000 rpm, then the speed of the crankshaft is
Answer
B. 200 rpm
79
The primary function of an over running clutch in the starter motor is
Answer
C. to prevent damage to armature from spinning at high speed
80
The two types of fuses used in automobiles are
Answer
A. catridge and blade
81
The mostly used firing order of six cylinder engine is
Answer
D. 1-5-3-6-2-4
82
Electronic ignition system consists of
Answer
D. pulse generator or Hall-effect switch
83
In third brush generator, the third brush is placed somewhere where the flux
becomes
Answer
B. weaker at the higher speeds due to armature reactions
84
Which of the following statement is correct about current voltage regulator ?
Answer
C. When battery charge is low, current regulator will operate
85
Keyless entry systems can be operated by a small hand-held transmitter upto
distance of
Answer
D. 10 m
86
The vehicle location on the road can be shown by
Answer
C. electronic navigation system
87
In the floor-type head light aiming system, the distance between the car and screen
should be
Answer
B. 7.6 m
88
The pitch of the electrically-operated horn sound is determined by
Answer
D. number of vibrations per second
89
In a capacitor-discharge ignition, the spark occurs when
Answer
C. a transistor or switch closes the primary circuit
90
The stationary magnetic field in the magnetic starter motor is produced by the
Answer
B. field windings in electromagnet or permanent-magnet
91
The unit of Density in SI unit is
Answer
A. kg/m3
92
Venturimeter is a device used to measure the
Answer
C. Rate of flow of fluid
93
Newton’s law of viscosity states that
Answer
B. Shear stress is directly proportional to velocity gradient
94
Which one of the following is a type of actuator in a hydraulic system ?
Answer
D. Cylinder
95
The power source in Pneumatic system is
Answer
B. Compressor
96
Which one of the following welding processes uses non-consumable electrodes ?
Answer
A. TIG welding
97
In normalizing, components are cooled
Answer
C. In still air
98
Which among the following is not a type of non-destructive testing ?
Answer
A. Compression testing
99
Hooke’s law holds good upto
Answer
C. Elastic limit
100
Factor of safety is defined as the ratio of
Answer
C. Ultimate stress to working stress
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