Year 2 J2

Question 1

Three types of mechanisms for sensing pressure

Answer 1

Bourdon Tube
Bellows
Diaphragm

Question 2

Three different current ratings for switches

Answer 2

Inrush or make contact
Normal or continuous
Opening or break contact

Question 3

on-delay timer

Answer 3

contact action occurs after the relay is energized

Question 4

off-delay timer

Answer 4

contact action is instantaneous when the relay is first energized, and the time delay occurs when the delay is de-energized

Question 5

Dashpot timer

Answer 5

the fluid in the dashpot provides a retarding action for the piston

Question 6

Pneumatic timer

Answer 6

Transfer of air through a restricted orifice

Question 7

Motor-driven timers

Answer 7

small synchronous motor

longer time delays even in hrs

Question 8

Electronic timers

Answer 8

use the R-C time constant principle for charging capacitors

Question 9

Plugging

Answer 9

used for quickly stopping a motor

puts it in reverse to quickly stop it.

Question 10

Plugging switch or zero-speed switch

Answer 10

the control scheme for reversing a magnetic starter and a rotary-motion switch