10+ Electronic Payment And Services Interview Questions and Answers

Entropy is the measure of disorder in a system while enthalpy is the measure of heat energy in a system.

• Entropy is a state function while enthalpy is a path function.

• Entropy is denoted by S while enthalpy is denoted by H.

• Entropy increases with an increase in disorder while enthalpy increases with an increase in heat energy.

• Entropy is used to determine the spontaneity of a process while enthalpy is used to determine the heat absorbed or released in a process.

MPFIS is a fuel injection system that uses multiple injectors to deliver fuel to each cylinder individually.

• MPFIS uses multiple injectors to deliver fuel to each cylinder separately.

• Each injector is controlled by the engine control unit (ECU) based on various sensor inputs.

• The ECU calculates the amount of fuel needed for each cylinder and opens the corresponding injector for the required duration.

• This system ensures precise fuel delivery, better fuel atomization, and improved...read more

Types of cast iron include gray cast iron, white cast iron, ductile cast iron, and malleable cast iron, each with specific applications in machines.

• Gray cast iron: used for engine blocks, gears, and machine tool structures

• White cast iron: used for wear-resistant parts like cylinder liners and grinding balls

• Ductile cast iron: used for crankshafts, camshafts, and gears in automotive applications

• Malleable cast iron: used for pipe fittings, agricultural equipment, and machinery c...read more

Slider crank mechanism is a basic mechanical component used in engines and machines to convert rotary motion into linear motion.

• Consists of a slider, crank, connecting rod and a shaft

• Slider moves back and forth in a straight line

• Crank rotates in a circular motion

• Connecting rod connects the slider and the crank

• Used in engines to convert the reciprocating motion of pistons into rotary motion of the crankshaft

• Also used in machines like pumps, compressors and presses

Toughness is the ability of a material to resist fracture, ductility is the ability to deform without breaking, and malleability is the ability to be hammered into thin sheets.

• Toughness is the ability of a material to absorb energy and plastically deform without fracturing.

• Ductility is the ability of a material to undergo significant plastic deformation before rupture.

• Malleability is the ability of a material to be hammered or rolled into thin sheets without breaking.

• Examples...read more

Sampling reduces quantisation error by approximating continuous signals with discrete values.

• Sampling involves taking discrete samples of a continuous signal at regular intervals.

• Quantisation is the process of approximating the continuous amplitude values of a signal with a limited set of discrete values.

• By sampling the signal before quantisation, the quantisation error can be reduced as the discrete values are closer to the original continuous signal.

• For example, in audio si...read more

Symbols represent abstract ideas or concepts, while bits are the smallest unit of data in computing.

• Symbols represent ideas, concepts, or objects, while bits represent binary data (0 or 1).

• Symbols can be letters, numbers, or other characters used in language, while bits are used in computing to represent information.

• Symbols are used in communication and language, while bits are used in digital systems for processing and storage.

• Examples: Symbol - 'A', Bit - 1

Radars are electronic devices that use radio waves to detect and locate objects.

• Radars emit radio waves and then detect the reflected waves to determine the location and speed of objects.

• They are used in aviation, military, weather forecasting, and traffic control.

• Different types of radars include weather radar, air traffic control radar, and military radar.

• The Doppler radar is used to detect the speed of objects, such as in weather forecasting.

• The phased array radar uses mul...read more

Gears are mechanical components that transmit motion and power between rotating shafts.

• Gears are toothed wheels that mesh together to transmit motion.

• They are used to change the speed, torque, and direction of rotation in machinery.

• Common types of gears include spur gears, helical gears, bevel gears, and worm gears.

• Gears are often used in vehicles, industrial machinery, and household appliances.