Question 1

An electromagnetic switch operated by a solenoid is one definition of:

Accepted Answer

A)   a transformer
B)   an a.c. motor
C)   a relay
D)   an inductive coil. C

Question 2

The resistance of a kettle element which takes 12 A from a 230 A main supply is:

Accepted Answer

A)   2.88 ?
B)   5.00 ?
C)   12.24 ?
D)   19.16 ?. D

Question 3

Current flowing through a solenoid sets up a magnetic flux. If an iron core is added to the solenoid while the current is maintained at a constant value, the magnetic flux will:

Accepted Answer

A)   remain constant
B)   totally collapse
C)   decrease in strength
D)   increase in strength. D

Question 4

One application for a series d.c. motor is:

Accepted Answer

A)   an electric train
B)   a microwave oven
C)   a central heating pump
D)   an electric drill.

Question 5

Which of the following may be defined as 'the rate of doing work':

Accepted Answer

A)   acceleration
B)   work done
C)   power
D)   velocity

Question 6

Two identical resistors are connected in parallel across a 24 V battery. The voltage drop across each resistor will be:

Accepted Answer

A)   24 V.
B)   2 V
C)   6 V
D)   12 V

Question 7

A good insulator material:

Accepted Answer

A)   has lots of free electrons
B)   has no free electrons
C)   may be made of copper
D)   may be made of plastic.

Question 8

Resistors of 20 ?, 40 ? and 60 ? are connected in parallel. The total resistance value will be:

Accepted Answer

A)   10.9 ?
B)   20.0 ?
C)   60.0 ?
D)   120 ?.

Question 9

Two identical resistors are connected in series across a 24 V battery. The voltage drop across each resistor will be:

Accepted Answer

A)   2 V
B)   6 V
C)   12 V
D)   24 V.

Question 10

A straight line having definite length and direction that represents to scale a quantity such as current voltage or impedance is called:

Accepted Answer

A)   a series a.c. circuit
B)   capacitive reactance
C)   a phasor, as in a phasor diagram
D)   the impedance triangle.

Question 11

A 12 ? filament lamp was found to be taking a current of 2 A at full brilliance. The voltage across the lamp under these conditions is:

Accepted Answer

A)   6 V
B)   12 V
C)   24 V
D)   48 V.

Question 12

Which of the following may be defined as 'the speed in a given direction':

Accepted Answer

A)   acceleration
B)   work done
C)   power
D)   velocity

Question 13

An a.c. series circuit has a capacitive reactance of 12 ? and a resistance of 9 ?. The impedance of this current will be:

Accepted Answer

A)   3 ?
B)   15 ?
C)   20 ?
D)   108 ?.

Question 14

Which of the following may be defined as 'the force applied times the distance moved in the direction of the force':

Accepted Answer

A)   acceleration
B)   work done
C)   power
D)   velocity

Question 15

The SI unit of mass is the:

Accepted Answer

A)   kilogram or kg
B)   pound or lb
C)   metre or m
D)   millimetre or mm.

Question 16

Resistors of 6 ? and 3 ? are connected in series. The combined resistance value will be:

Accepted Answer

A)   2.0 ?
B)   3.6 ?
C)   6.3 ?
D)   9.0 ?.

Question 17

The current taken by a 10 ? resistor when connected to a 230 V supply will be:

Accepted Answer

A)   2.3 A
B)   10 A
C)   23 A
D)   230 A.

Question 18

A circuit with bad power factor causes:

Accepted Answer

A)   a fall in the supply voltage
B)   an increase in the supply voltage
C)   more current to be taken from the supply
D)   less current to be taken from the supply.

Question 19

One application for an a.c. induction motor is:

Accepted Answer

A)   an electric train
B)   a microwave oven
C)   a central heating pump
D)   an electric drill.

Question 20

Which of the following may be defined as 'a measure of the force which a body exerts on anything which supports it':

Accepted Answer

A)   acceleration
B)   force
C)   mass
D)   weight.

Exam 2: Understand the Fundamental Principles and Requirements of Environmental Technology Systems

An electromagnetic switch operated by a solenoid is one definition of:

The resistance of a kettle element which takes 12 A from a 230 A main supply is:

Current flowing through a solenoid sets up a magnetic flux. If an iron core is added to the solenoid while the current is maintained at a constant value, the magnetic flux will:

One application for a series d.c. motor is:

Which of the following may be defined as 'the rate of doing work':

Two identical resistors are connected in parallel across a 24 V battery. The voltage drop across each resistor will be:

A good insulator material:

Resistors of 20 ?, 40 ? and 60 ? are connected in parallel. The total resistance value will be:

Two identical resistors are connected in series across a 24 V battery. The voltage drop across each resistor will be:

A straight line having definite length and direction that represents to scale a quantity such as current voltage or impedance is called:

A 12 ? filament lamp was found to be taking a current of 2 A at full brilliance. The voltage across the lamp under these conditions is:

Which of the following may be defined as 'the speed in a given direction':

An a.c. series circuit has a capacitive reactance of 12 ? and a resistance of 9 ?. The impedance of this current will be:

Which of the following may be defined as 'the force applied times the distance moved in the direction of the force':

The SI unit of mass is the:

Resistors of 6 ? and 3 ? are connected in series. The combined resistance value will be:

The current taken by a 10 ? resistor when connected to a 230 V supply will be:

A circuit with bad power factor causes:

One application for an a.c. induction motor is:

Which of the following may be defined as 'a measure of the force which a body exerts on anything which supports it':