1) What fuse is required to protect a circuit with 4KW heater on a 230-volt supply? a) 5 amps b) 10 amps c) 13 amps d) 16 amps 2) What is the specific heat capacity for water under atmospheric conditions? a) 1 kj/kg/°C b) 3.14kj/kg/°C c) 4.18kj/kg/°C d) 9.18kj/kg/°C 3) Calculate energy required to heat 140 litres of water from 4°c to 80 °c a) 44,539.04 KJ b) 46,883.2 KJ c) 4,166.4 KJ d) 45,768.02 KJ 4) A 3m length of copper tube is raised form 15°c to 60°c. Coefficient of copper is 0.000017 m/°C. What length would the pipework increase by? a) 0.2295mm b) 0.459mm c) 2.295mm d) 45.9mm 5) An overcurrent protection device of 5a is installed on a 230v supply What is the maximum load allowed on the circuit? a) 0.5 W b) 115 W c) 1.15 KW d) 11.5 KW 6) What temperature is 373K in the Celsius scale? a) 173°C b) 100°C c) -173°C d) -200°C 7) Select the correct equation to calculate the linear expansion within a 10m length of copper pipe if it was heated by 30°C a) 3.14 x 10x 30 b) 10 x 30 x 0.000016 c) 30 / 10 X (0.000011) d) 4.18 X 30 X 10 8) What is the correct calculation to determine the volume of a cylinder? a) 3.14 x radius2 x height b) 3.14 x diameter x height c) Diameter/ height x (3.14)2 d) 3.14 x diameter2 9) An electrical immersion heater is required to provide 36,000kJ of heat energy to heat a cylinder. What is the power of the immersion heater if it raises the temperature of the water to its design temperature within one hour? a) 10 watts b) 10Kw c) 100 watts d) 100kW 10) To determine the current within a circuit, which calculation is used? a) Watts/volts b) Watts/Ohms c) Volts/Watts d) Ohms/Volts

Exam questions using Maths

Print
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?