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AEE Certified Energy Manager (CEM) Sample Questions:

1. How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 630 kJ
B) 840 kJ
C) 510 kJ
D) 420 kJ

2. What is a common cause of poor power quality?

A) Electronic equipment, such as personal computers
B) Incandescent lighting
C) Partially loaded induction motors
D) Natural gas turbine power generation by utilities
E) Synchronous motors

3. A 50-kW induction motor (1,500 rpm synchronous speed) has a nameplate full-load rotational speed of 1,455 rpm. Field measurements show the actual rotational speed is 1,475 rpm. Using the slip method, calculate the partial load factor of the motor.

A) 98%
B) 56%
C) 101%
D) 46%
E) 80%

4. Which pump system listed below is most likely the best application for converting to variable-speed drive?

A) Pump system with on-off control transferring liquid vertically from a low tank to a higher tank
B) Pump system with parallel rotary lobe pumps in a rebar quenching application with a static head of 80m
C) Pump system with bypass control transferring liquid from an intake dam to a process in production
D) Pump system with throttle fully open circulating liquid in a closed loop cooling system

5. What is a common method to reduce the impact of voltage imbalance?

A) Rebalance single-phase loads
B) Reverse phase connections on three-phase motors
C) Install harmonic filters
D) Install capacitors to improve power factor on three-phase loads

Solutions: