CITY & GUILDS 2365 UNIT 614 MOCK
EXAM VERSION B | QUESTIONS AND
ANSWERS |2026/2027 UPDATE | JUST
RELEASED
1. Which specific UK legislation establishes the framework for reducing greenhouse gas
emissions by at least 100% by 2050 compared to 1990 levels?
A. Energy Act 2011
B. Sustainable Communities Act 2007
C. Climate Change Act 2008
D. Environmental Protection Act 1990
Answer: C
Conceptual Explanation: The Climate Change Act 2008 (as amended in 2019) sets the
legally binding target for the UK to reach net-zero greenhouse gas emissions by 2050.
2. Under the Microgeneration Certification Scheme (MCS), what is the maximum electrical
output capacity for a Solar PV system to be classified as microgeneration?
A. 50 kWp
B. 45 kWp
C. 10 kWp
,D. 100 kWp
Answer: A
Conceptual Explanation: For electrical installations like PV or wind, the MCS
microgeneration limit is 50 kWp; for heat (thermal), it is 45 kWth.
3. Which component in a grid-tied solar PV system is responsible for ensuring the system
disconnects during a power outage to prevent islanding?
A. Bypass diode
C. Inverter (G98/G99 compliant)
B. DC Isolator
D. Charge Controller
Answer: C
Conceptual Explanation: Grid-tied inverters must have ‘anti-islanding’ protection to
ensure they do not feed electricity into a dead grid, protecting utility workers.
4. The ‘Betz Limit’ establishes that the maximum theoretical efficiency for extracting energy
from the wind is approximately:
A. 33.3%
B. 90.2%
C. 75.0%
D. 59.3%
, Answer: D
Conceptual Explanation: The Betz limit states that no turbine can capture more than
59.3% of the kinetic energy in wind.
5. In a solar thermal system, what is the primary purpose of the ‘stagnation’ phase?
A. To maximize heat transfer during peak sun
B. To clean the collectors using high-temperature steam
C. It is an emergency state where the pump stops because the cylinder reached its limit
D. To calibrate the differential temperature controller
Answer: C
Conceptual Explanation: Stagnation occurs when the solar pump stops (often because the
storage tank is full), causing the fluid in the collector to turn to steam.
6. A heat pump has a Coefficient of Performance (COP) of 4.0. If the electrical input is 2 kW,
what is the heat output?
A. 0.5 kW
B. 2 kW
C. 6 kW
D. 8 kW
Answer: D
EXAM VERSION B | QUESTIONS AND
ANSWERS |2026/2027 UPDATE | JUST
RELEASED
1. Which specific UK legislation establishes the framework for reducing greenhouse gas
emissions by at least 100% by 2050 compared to 1990 levels?
A. Energy Act 2011
B. Sustainable Communities Act 2007
C. Climate Change Act 2008
D. Environmental Protection Act 1990
Answer: C
Conceptual Explanation: The Climate Change Act 2008 (as amended in 2019) sets the
legally binding target for the UK to reach net-zero greenhouse gas emissions by 2050.
2. Under the Microgeneration Certification Scheme (MCS), what is the maximum electrical
output capacity for a Solar PV system to be classified as microgeneration?
A. 50 kWp
B. 45 kWp
C. 10 kWp
,D. 100 kWp
Answer: A
Conceptual Explanation: For electrical installations like PV or wind, the MCS
microgeneration limit is 50 kWp; for heat (thermal), it is 45 kWth.
3. Which component in a grid-tied solar PV system is responsible for ensuring the system
disconnects during a power outage to prevent islanding?
A. Bypass diode
C. Inverter (G98/G99 compliant)
B. DC Isolator
D. Charge Controller
Answer: C
Conceptual Explanation: Grid-tied inverters must have ‘anti-islanding’ protection to
ensure they do not feed electricity into a dead grid, protecting utility workers.
4. The ‘Betz Limit’ establishes that the maximum theoretical efficiency for extracting energy
from the wind is approximately:
A. 33.3%
B. 90.2%
C. 75.0%
D. 59.3%
, Answer: D
Conceptual Explanation: The Betz limit states that no turbine can capture more than
59.3% of the kinetic energy in wind.
5. In a solar thermal system, what is the primary purpose of the ‘stagnation’ phase?
A. To maximize heat transfer during peak sun
B. To clean the collectors using high-temperature steam
C. It is an emergency state where the pump stops because the cylinder reached its limit
D. To calibrate the differential temperature controller
Answer: C
Conceptual Explanation: Stagnation occurs when the solar pump stops (often because the
storage tank is full), causing the fluid in the collector to turn to steam.
6. A heat pump has a Coefficient of Performance (COP) of 4.0. If the electrical input is 2 kW,
what is the heat output?
A. 0.5 kW
B. 2 kW
C. 6 kW
D. 8 kW
Answer: D
