# City and Guilds 2330 Level 2.01 Question Paper and Answers

Pages: 7 (1234 words) Published: March 5, 2013
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C&G 2330 202 REVISION QUESTIONS

The relationship between the mass of a body (m), the applied force to the body (F) and the acceleration of the body a. is given by the formula: a.Force = mass x acceleration, F = m x a
b.mass = Force x acceleration, m = F x a
c.acceleration = mass x Force, a = m x F
d.acceleration = mass / Force, a = m / F

The SI unit of time is the second. Express 0.00001 seconds in a suitable sub multiple: a.10 milliseconds, 10 ms
b.100 milliseconds, 100 ms
c.100 microseconds, 100 us
d.10 microseconds, 10 us

In a magnetic circuit the magnetic field strength H is expressed in ampere turns/metre. H is calculated using the formula: a.H = I/nl
b.H = nI/l
c.H = Il/n
d.H = nl/I

The formula used to calculate the resistance (R) of a conductor, given its length (l), cross sectional area a. and the constant of resistivity (p) a.R = pl/a
b.R = a/pl
c.R = pa/l
d.R = al/p

A simple alternator consists of a coil which is rotated in a permanent magnetic field. The emf generated I the rotating coil is connected to a load via: a.commutator and brushes
b.slip rings and brushes
c.flexible cables
d.slide rails and contacts

If the input energy and output energy of a machine are known, the percentage efficiency of the machine is calculated using the formula: a.Efficiency = output energy / input energy x 100/1
b.Efficiency = input energy / output energy x 100/1
c.Efficiency = output energy / input energy x 1/100
d.Efficiency = input energy / output energy x 1/100

The most common material used to manufacture brushes used in a.c. and d.c. rotating machines is a.copper
b.aluminium
c.bronze
d.carbon

The material used as an insulator on which overhead lines are suspended from pylons is: a.glass
b.mica
c.P.V.C.
d.rubber

Electric current is the flow of negatively charged particles called: a.protons
b.electrons
c.neutrons
d.atoms

In a storage battery the emf is produced by the
a.heating effect
b.magnetic effect
c.chemical effect
d.movement effect

Insulating materials are materials which have atomic structures with: a.few free electrons
b.many free electrons
c.many free protons
d.few free protons

The meters M1 and M2 connected in the circuit shown in fig. X, will measure: a.M1 = voltage M2 = current
b.M1 = current M2 = current
c.M1 = voltage M2 = voltage
d.M1 = current M2 = voltage

It is beneficial to use transformers to produce high voltages for energy transmission in order to: a.increase the speed of energy transmission
b.reduce the size of transmission line conductors
c.allow the use of less expensive insulating materials
d.increase the power generated

Given the formula
Force (newtons) = Mass (kg) x acceleration (m/s2)
a body is accelerated at 2 m/s2 when a force of 10 newtons is applied to is, the mass of the body will be: a.2 kg
b.5 kg
c.10 kg
d.20 kg

The power (P) in an electrical circuit is given by the formula P = V²/R The re-arranged formula to calculate V is: a.V = P x R
b.V = P x ~R
c.V = SIP /R
d.V = V(PR)

A d.c. machine has a power output of 1200 watts. The input current is 4A and the applied voltage is 375V. The efficiency of the machine will be a.50%
b.80%
c.85%
d.90%

Two resistors of 20 ohms and 40 ohms are connected in series across a 120v d.c. supply, the current flowing in the circuit will be: a.0.5 A
b.2 A
c.5 A
d.20 A

The following are all parts of an electrical circuit:
b.conduit, cable, cable clip
c.fuse, motor casing, cable insulation
d.trunking, switch, switch box

The most suitable type of wiring system for the distribution of three phase electrical energy underground between buildings will be: a.P.V.C...