SCIENCE PART 6.2 TRANSFORMERS

Froggy Jumps

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DLP SCIENCE FORM 3

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Hanis Shahirah Mohd Khairi

Malaysia

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SCIENCE PART 6.2 TRANSFORMERS


Froggy Jumps SCIENCE PART 6.2 TRANSFORMERSOnline version DLP SCIENCE FORM 3 by Hanis Shahirah Mohd Khairi 1 1. Which component in a home wiring system measures the total units of electricity used? a Main switch b Fuse box c Electric meter 2 2. What is the primary function of the Earth Leakage Circuit Breaker (ELCB) in home wiring? a To isolate the final circuit to different electrical appliances b To break the circuit when too much current flows through it c To measure total electricity consumption 3 Which of the following standard fuse values is commonly used in domestic circuits? a 4 A b 13 A c 20 A 4 According to the international colour code for wiring, what colour is the insulation of the live wire? a Blue b Yellow and green stripes c Brown 5 Which appliance typically requires a 3-pin plug rather than a 2-pin plug? a Hair dryer b Iron c Radio charger 6 In a step-up transformer, how do the primary and secondary voltages compare? a The primary voltage is higher than the secondary voltage b The primary voltage is lower than the secondary voltage c The primary voltage alternates independently of the secondary voltage 7 What is a characteristic feature of a step-down transformer's coil turns? a Primary coil has no turns, only an iron core b Number of turns of primary coil is more than that of secondary coil c Number of turns of primary coil is less than that of secondary coil 8 In the National Grid Network layout, what is represented by the letter A? a Switch zone b Main substation c Power station 9 What type of energy conversion takes place inside a standard power station using radioactive substances? a Light -> Heat -> Electrical b Radioactive substance -> Heat -> Kinetic -> Electrical c Chemical -> Potential -> Kinetic -> Electrical 10 Which energy source is categorized as renewable? a Nuclear energy b Natural gas c Geothermal energy 11 What type of electric current is produced by a generator whose current flows in only one direction? a Alternating current (AC) b Direct current (DC) c Static discharge current 12 Which of the following generators produces direct current (DC)? a Solar cell b Hydroelectric power station c Thermal power station 13 What change in energy conversion produces an induced current in electromagnetic induction experiments? a Sound energy -> electrical energy b Kinetic energy -> electrical energy c Chemical energy -> electrical energy 14 In transmission systems, why is electricity transmitted at very high voltages across long-distance cables? a To match the voltage requirements of standard household appliances directly b To increase energy loss through heating in the cables c To reduce energy loss by decreasing current over transmission lines 15 What is the function of the miniature circuit breaker (MCB) in domestic wiring? a To measure total monthly kilowatt-hour consumption b To separate the final circuit to different electrical appliances c To protect against lightning strikes on the main service line 16 Which color identifies the neutral wire in standard appliance cabling? a Black b Brown c Blue 17 What is the main hazard associated with touching switches with wet hands? a It immediately causes a short circuit in the main power station b Water lowers human skin resistance, increasing the risk of severe electrical shock c It magnetizes the internal copper windings of the switch 18 In a step-up transformer, how does the magnitude of the output voltage compare to the input voltage? a Output voltage is lower b Output voltage is higher c Output voltage fluctuates between zero and negative values 19 What component protects household wiring by melting when an excessive current flows through it? a Earth wire b Fuse c Main switch 20 Which part of the National Grid Network steps up voltage directly after generation at the power station? a Step-down transformer station (Bt) b Step-up transformer station (Bn) c Branch substation (E2) 21 Which safety precaution prevents thermal overloading in a single power socket? a Avoid connecting too many appliances to one socket b Replace 3-pin plugs with ungrounded 2-pin plugs c Remove the fuse wire completely to increase current flow 22 In an electromagnetic induction setup, what does a zero reading on a sensitive center-zero galvanometer indicate? a The primary voltage exceeds the secondary voltage b Maximum alternating current generation c No induced current is flowing 23 What is the primary role of the Earth wire in an appliance plug? a To supply live operating current to the motor b To provide a safe low-resistance path to the ground if a live wire touches the metal casing c To step down voltage from 240 V to 11 V 24 Which of the following represents a non-renewable fossil fuel energy source? a Biomass b Solar thermal c Petroleum 25 What type of transformer is located right before residential distribution to lower the voltage to 240 V? a Step-up transformer b Step-down transformer c High-frequency step-up oscillator 26 A transformer has 800 turns on its primary coil and 200 turns on its secondary coil. If the primary voltage is 400 V, what is the secondary voltage, and what type of transformer is it? a 100 V, Step-up transformer b 100 V, Step-down transformer c 1 600 V, Step-down transformer 27 Why would a domestic circuit fitted with a standard 5 A fuse experience immediate power disconnection when a 2 500 W, 240 V heater is plugged in and switched on? a The heater draws a current of approximately 10.4 A, which exceeds the 5 A fuse rating b The Earth Leakage Circuit Breaker detects low air humidity and cuts off the line c The primary voltage of the appliance exceeds the main switch threshold of 11kV 28 Which of the following electrical wiring components is specifically designed to isolate a final individual circuit to different electrical appliances in a house? a Miniature Circuit Breaker (MCB) b Earth Leakage Circuit Breaker (ELCB) c Main switch 29 Which of the following is a primary function of the main switch in a domestic wiring system? a To measure the total units of electricity consumed by the household b To control the total current flowing through the circuit in the entire house c To provide a direct path to the ground for fault currents 30 What type of transformer is required to decrease the output voltage before electricity reaches commercial and residential areas from transmission lines? a Step-up transformer b Direct current generator c Step-down transformer

SCIENCE PART 6.2 TRANSFORMERS

Froggy Jumps

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SCIENCE PART 6.2 TRANSFORMERSOnline version

by Hanis Shahirah Mohd Khairi

1. Which component in a home wiring system measures the total units of electricity used?

2. What is the primary function of the Earth Leakage Circuit Breaker (ELCB) in home wiring?

Which of the following standard fuse values is commonly used in domestic circuits?

According to the international colour code for wiring, what colour is the insulation of the live wire?

Which appliance typically requires a 3-pin plug rather than a 2-pin plug?

In a step-up transformer, how do the primary and secondary voltages compare?

What is a characteristic feature of a step-down transformer's coil turns?

In the National Grid Network layout, what is represented by the letter A?

What type of energy conversion takes place inside a standard power station using radioactive substances?

Which energy source is categorized as renewable?

What type of electric current is produced by a generator whose current flows in only one direction?

Which of the following generators produces direct current (DC)?

What change in energy conversion produces an induced current in electromagnetic induction experiments?

In transmission systems, why is electricity transmitted at very high voltages across long-distance cables?

What is the function of the miniature circuit breaker (MCB) in domestic wiring?

Which color identifies the neutral wire in standard appliance cabling?

What is the main hazard associated with touching switches with wet hands?

In a step-up transformer, how does the magnitude of the output voltage compare to the input voltage?

What component protects household wiring by melting when an excessive current flows through it?

Which part of the National Grid Network steps up voltage directly after generation at the power station?

Which safety precaution prevents thermal overloading in a single power socket?

In an electromagnetic induction setup, what does a zero reading on a sensitive center-zero galvanometer indicate?

What is the primary role of the Earth wire in an appliance plug?

Which of the following represents a non-renewable fossil fuel energy source?

What type of transformer is located right before residential distribution to lower the voltage to 240 V?

A transformer has 800 turns on its primary coil and 200 turns on its secondary coil. If the primary voltage is 400 V, what is the secondary voltage, and what type of transformer is it?

Why would a domestic circuit fitted with a standard 5 A fuse experience immediate power disconnection when a 2 500 W, 240 V heater is plugged in and switched on?

Which of the following electrical wiring components is specifically designed to isolate a final individual circuit to different electrical appliances in a house?

Which of the following is a primary function of the main switch in a domestic wiring system?

What type of transformer is required to decrease the output voltage before electricity reaches commercial and residential areas from transmission lines?