Ch19.3-20 Test MCQ

Q1:Class

Q2:Name

Q3:Which symbol represents an AND gate?

Q4:An incomplete truth table for a NAND gate is shown. What are the values of W, X, Y and Z?[图片]

Q5:A truth table for a type of logic gate is shown. Which type of logic gate is it? [图片]

Q6:This is the truth table for a logic gate. Which symbol represents the logic gate?[图片]

Q7:There are two inputs and one output for the combination of logic gates shown. Which truth table represents the operation of this combination of logic gates?[图片]

Q8:In the circuit shown, the current from the battery divides equally between the two lamps. Each ammeter reads 6.0A. What is a suitable rating for the fuse in this circuit? [图片]

Q9:Why are electric circuits often fitted with fuses?

Q10:A fuse and a relay each use an effect of an electric current. Which effect of an electric current is used by a fuse and which effect is used by a relay?[图片]

Q11:In this circuit, a component at X automatically protects the wiring from overheating if there is a fault. Which components are suitable to use at X? [图片]

Q12:Two electrical appliances are connected to the mains supply. The cable connected to one appliance includes an earth wire. The cable connected to the second appliance does not need an earth wire. What is a reason for this difference?