Q11. What is the term for the maximum stress a material can withstand before permanent deformation occurs?
Correct: Yield strength
Yield strength is the stress at which a material begins to deform plastically. Beyond this point, the material will not return to its original shape when the load is removed.
Q12. Which type of gear is used to transmit power between parallel shafts?
Correct: Spur gear
Spur gears have straight teeth and are used to transmit power between parallel shafts. They are the simplest and most common type of gear.
Q13. What is the relationship between frequency (f) and period (T) of a wave?
Correct: f = 1/T
Frequency is the reciprocal of period: f = 1/T. If a wave completes one cycle in 0.5 seconds (period), its frequency is 2 Hz.
Q14. In fluid mechanics, what does the Reynolds number determine?
Correct: Flow type (laminar or turbulent)
The Reynolds number is a dimensionless quantity that predicts whether fluid flow will be laminar or turbulent. Low values indicate laminar flow, high values indicate turbulent flow.
Q15. What type of capacitor is polarized and must be connected with correct polarity?
Correct: Electrolytic capacitor
Electrolytic capacitors are polarized and have positive and negative terminals. Connecting them with reverse polarity can damage them or cause failure.
Q16. What is the center of gravity of an object?
Correct: The point where weight is concentrated
The center of gravity is the point where the entire weight of an object can be considered to act. It is the point where the object would balance perfectly.
Q17. Which welding process uses a consumable electrode and inert gas shielding?
Correct: MIG welding
MIG (Metal Inert Gas) welding, also known as GMAW (Gas Metal Arc Welding), uses a continuously fed consumable wire electrode and an inert shielding gas to protect the weld.
Q18. What is the formula for calculating mechanical advantage of a simple machine?
Correct: Output force / Input force
Mechanical advantage = Output force / Input force (or Load / Effort). It indicates how much a machine multiplies the input force.
Q19. In digital electronics, how many bits are in one byte?
Correct: 8
One byte consists of 8 bits. A bit is the smallest unit of data (0 or 1), and a byte can represent 256 different values (2^8).
Q20. What is the main purpose of a heat exchanger?
Correct: To transfer heat between fluids
A heat exchanger is a device designed to efficiently transfer thermal energy from one fluid to another without mixing them, commonly used in HVAC, refrigeration, and industrial processes.
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