Basics Energy Efficiency

Choose the correct answer :

QUESTION 12

1. Which knowledge in the hands of an industrial consumer is most likely to lead to discovery of the most valuable energy cost savings?

a-The total energy bill
b-The energy bill split between sub-divisions of the plant
c-The energy bill split between end-uses on the plant

d-Time-based energy consumption profiles per end-use

QUESTION 13

1. Suppose that we have a motor three phase voltages as 404, 395 and 380 volts. Calculate the voltage imbalance??

a- 3.2 %
b - 3.3%
c- 3.4%
d- 3.5%

QUESTION 14

1. A recent advertisement said an IE3 (premium efficiency) 50 kW motor is available at 95%. It would replace an IE1 motor that presently runs at 91% efficiency. Given that (Motor runs 2,920 hours/year, Demand cost is $ 10.00 kW per month, Energy cost is $0.6/kWh and Motor runs at 85% partial load all the time), calculate the annual savings ?

a-$ 580.44
b-$ 670.31
c-$ 1,741.15
d-$ 120.44

QUESTION 15

1. A three-phase 90 kW motor which has an efficiency of 92.5%. If its operated with an electrical power input 68.1 kW, at what load factor the motor is operated?

a-80%
b-75%
c-70%
d-65%

As per Faradays law of electromagnetics, demonstrates the transformer’s primary to secondary induce flux effect for voltage variation.

a) Draw the simplest circuit of the nMOS co-source amplifier and subtract the expression of the AC small signal voltage gain. (Note: Drain will have RD and Source will have degeneration resistance RS.)

b) Draw the small signal equivalent circuit of the circuit in question (a). Find the expression of the output impedance.

c) What is the Miller effect?

My English is weak, please have a clean spelling.

Implement a JK Flip flop using behavioral modeling in verilog, also write its test bench code.

Create a circuit that allows the client to add numbers one by one into a register file (8 four-bit registers) by inputting: 1) the number itsself 2) the memory location The circuit can be logic gates OR verilog code. whichever you prefer! Thank you and I will rate!

1. Determine the stability region using the Schur-Cohn criterion for a system whose characteristic equation P(z).

   ?(?) = ?^3 + 0.5?^2 + ? = 0

2. A capacitor consists of two metal plates, each 200mm by 300mm, spaced 9mm apart. The spaced between the metal plates is filled with mica 6mm thick and a layer of paper 3mm thick. The relative permittivity of the mica and paper are 9 and 6 respectively. Calculate: the i. capacitance and ii. electric field strength in each dielectric in kV/mm due to a pd of 10kV between the metal plates.

1. Determine forced and natural response for the following equation, where y[-1] =1, y[-2]=1 and x[n] = delta[n].

y[n]+1/2 y[n-1] -1/4 y[n-2] = x[n]

2. find the impulse response of the system described below

y[n]=1/2 y[n-1] + 2x[n]  

1. What is the need of a sub-station in the power system ?

2. Why are pole-mounted sub-stations very popular ?

3. Where we erect a terminal sub-station ?

4. Why do we use isolators on both sides of circuit breaker ?

5. What is the utility of instrument transformers in sub-stations ?

Two induction coils are wound on the same form as shown in Figure 8. Explain what the symbols L1, L2, M refer to, and explain the significance black dots shown. [5 marks] Figure 8: Self-inductances and mutual inductance  

(10) Band gap of a semiconductor cannot be tailored by (   )

(A) Lattice-matched epitaxy

(B) Formation of quantum well

(C) Strained-layer epitaxy

(D) Alloying

5) Solve the linear difference equation: ?(? + 2) − 4?(? + 1) + 3?(?) = 2 ??(?)

Given the initial conditions: ?(0) = 1 , ?(1) = 2