ELEC 2

Question 1

are toothed
mechanical
components that
transmit torque and
rotational motion
between shafts through
meshing surfaces.

Answer 1

GEARS

Question 2

TYPES OF GEARS

Answer 2

CARBURIZED GEAR
POLYMER GEARS

Question 3

for industrial enclosed gearboxes, spur
and helical gears, heavy-duty gear reducers.

Answer 3

Mobilgear 600 XP 220

Question 4

for high-speed or high-
temperature enclosed gear systems such as wind

turbines and conveyors.

Answer 4

Shell Omala S4 GX 220

Question 5

for high-temperature and
extended-drain applications in industrial gear
units, steel mills, and marine gearboxes.

Answer 5

Chevron Meropa EliteSyn 220

Question 6

support
rotating or moving
parts while minimizing
friction and wear
between contacting
surfaces.

Answer 6

BEARINGS

Question 7

TYPES OF BEARINGS

Answer 7

BALL BEARINGS
ROLLER BEARINGS
SLIDE BEARINGS
JEWEL
FLUID BEARINGS
THRUST BEARINGS

Question 8

caused by Rolling contact fatigue
over time.

Answer 8

Pitting/ Spalling

Question 9

breakdown of lubricant film at high speed
& temperature

Answer 9

Scuffing

Question 10

small oscillations or vibrations under load.

Answer 10

Fretting

Question 11

contamination, moisture ingress.

Answer 11

Abrasive

Question 12

inadequate lubricant
viscosity or poor cooling

Answer 12

Overheating / Film Failure

Question 13

slow down or
stop motion by
converting kinetic
energy into heat
through controlled
friction.

Answer 13

BRAKES

Question 14

TYPES OF BREAK

Answer 14

DRUM BRAKE
CONE BRAKE
DISC BRAKE
BAND BRAKE

Question 15

due to repeated sliding
contact between the brake shoe lining and
the drum surface under high friction.

Answer 15

Scoring and galling

Question 16

results from dust, dirt, or
metallic debris entering the brake assembly
when particles grind between the shoe and
drum surfaces, accelerating material
removal.

Answer 16

Abrasive wear

Question 17

Excessive heat during
repeated operation can polish the friction
surfaces, lowering the friction coefficient.

Answer 17

Glazing and fade

Question 18

caused by exposure to moisture
or contaminants, leading to rust on the cone
or cup surface.

Answer 18

Corrosion

Question 19

Occurs when lubricant
film breaks down or when components
operate dry, restricting smooth engagement.

Answer 19

Seizure or sticking

Question 20

Arise from uneven pad
contact, glazed friction surfaces, or dry metal
interfaces.

Answer 20

Brake squeal–

Question 21

prevent fluid
leakage and
contamination
between contacting
surfaces or within
mechanical systems
under pressure.

Answer 21

SEALS

Question 22

TYPES OF STATIC SEALS

Answer 22

GASKETS
O-RINGS
FLAT WASHERS

Question 23

in mechanical
seals is caused by
cavitation or pressure
fluctuations that create
tiny surface pits, leading
to seal face damage and
leakage.

Answer 23

Pitting

Question 24

occurs when
seal faces experience
high friction.

Answer 24

Scuffing

Question 25

for rubber O-rings and seals; valves, packings; dynamic and static seal interfaces.

Answer 25

MOLYKOTE 55 O-Ring Grease

Question 25

for mechanical seals and packings in chemically aggressive or high-temperature environments.

Answer 25

MOLYKOTE 3452 Chemical Resistant Valve Grease

Question 26

TYPES OF DYNAMIC SEALS

Answer 26

PISTONS SEALS ROD SEALS