CITY & GUILDS 2365 UNIT 614 MOCK
EXAM - ENVIRONMENTAL
TECHNOLOGIES | QUESTIONS AND
ANSWERS |2026/2027 UPDATE | JUST
RELEASED
1. Which of the following describes the ‘Betz Limit’ in relation to wind turbine technology?
A. The minimum wind speed required for the turbine to start generating electricity.
B. The maximum theoretical efficiency of a wind turbine, which is 59.3%.
C. The maximum speed at which a turbine can safely rotate before braking.
D. The height limit for domestic wind turbines under permitted development.
Answer: B
Conceptual Explanation: The Betz Limit establishes that no turbine can capture more
than 59.3% of the kinetic energy in wind.
2. In a solar thermal system, what is the primary purpose of a ‘heat exchanger’?
A. To convert DC current into AC current for the grid.
B. To track the sun’s movement throughout the day.
C. To increase the pressure of the refrigerant in the system.
,D. To transfer heat from the solar collector fluid to the domestic hot water without mixing
them.
Answer: D
Conceptual Explanation: Heat exchangers allow the thermal energy to transfer from the
primary solar circuit to the water in the cylinder while keeping the fluids separate.
3. Which document provides the specific requirements for the conservation of fuel and power
in new and existing dwellings in England?
A. Approved Document P
B. Approved Document G
C. Approved Document L1A/L1B
D. BS 7671 Requirements for Electrical Installations
Answer: C
Conceptual Explanation: Part L of the Building Regulations deals with the conservation of
fuel and power.
4. What does the ‘Coefficient of Performance’ (COP) measure in a heat pump system?
A. The ratio of heat output to electrical energy input.
B. The speed of the compressor motor.
C. The volume of refrigerant leaked per year.
D. The amount of solar radiation absorbed by the evaporator.
, Answer: A
Conceptual Explanation: COP is the ratio of useful heat produced to the electricity
consumed by the compressor and pumps.
5. Which type of solar PV cell is generally the most efficient but also the most expensive to
manufacture?
A. Polycrystalline
B. Monocrystalline
C. Amorphous Silicon (Thin film)
D. Cadmium Telluride
Answer: B
Conceptual Explanation: Monocrystalline cells are made from a single crystal structure,
allowing higher electron mobility and efficiency.
6. Under the Microgeneration Certification Scheme (MCS), what is the primary role of the
installer?
A. To bypass local planning permission requirements.
B. To provide financing for the homeowner.
C. To ensure the system is installed to a high standard and eligible for government
incentives.
D. To manufacture the solar panels on-site.
EXAM - ENVIRONMENTAL
TECHNOLOGIES | QUESTIONS AND
ANSWERS |2026/2027 UPDATE | JUST
RELEASED
1. Which of the following describes the ‘Betz Limit’ in relation to wind turbine technology?
A. The minimum wind speed required for the turbine to start generating electricity.
B. The maximum theoretical efficiency of a wind turbine, which is 59.3%.
C. The maximum speed at which a turbine can safely rotate before braking.
D. The height limit for domestic wind turbines under permitted development.
Answer: B
Conceptual Explanation: The Betz Limit establishes that no turbine can capture more
than 59.3% of the kinetic energy in wind.
2. In a solar thermal system, what is the primary purpose of a ‘heat exchanger’?
A. To convert DC current into AC current for the grid.
B. To track the sun’s movement throughout the day.
C. To increase the pressure of the refrigerant in the system.
,D. To transfer heat from the solar collector fluid to the domestic hot water without mixing
them.
Answer: D
Conceptual Explanation: Heat exchangers allow the thermal energy to transfer from the
primary solar circuit to the water in the cylinder while keeping the fluids separate.
3. Which document provides the specific requirements for the conservation of fuel and power
in new and existing dwellings in England?
A. Approved Document P
B. Approved Document G
C. Approved Document L1A/L1B
D. BS 7671 Requirements for Electrical Installations
Answer: C
Conceptual Explanation: Part L of the Building Regulations deals with the conservation of
fuel and power.
4. What does the ‘Coefficient of Performance’ (COP) measure in a heat pump system?
A. The ratio of heat output to electrical energy input.
B. The speed of the compressor motor.
C. The volume of refrigerant leaked per year.
D. The amount of solar radiation absorbed by the evaporator.
, Answer: A
Conceptual Explanation: COP is the ratio of useful heat produced to the electricity
consumed by the compressor and pumps.
5. Which type of solar PV cell is generally the most efficient but also the most expensive to
manufacture?
A. Polycrystalline
B. Monocrystalline
C. Amorphous Silicon (Thin film)
D. Cadmium Telluride
Answer: B
Conceptual Explanation: Monocrystalline cells are made from a single crystal structure,
allowing higher electron mobility and efficiency.
6. Under the Microgeneration Certification Scheme (MCS), what is the primary role of the
installer?
A. To bypass local planning permission requirements.
B. To provide financing for the homeowner.
C. To ensure the system is installed to a high standard and eligible for government
incentives.
D. To manufacture the solar panels on-site.
