Suppose the velocity of an electric vehicle increases linearly, becomes constant for some
time and then decreases linearly. Sketch this profile and show the region(s) where the
vehicle’s tractive force is negative. Give reason. (08)

For (8) questions only, choose the correct answer
1. The variations in pressure and temperature generally have only a small effect on liquid
density.
o True
o False
2. Ratio between the density of the fluid to the density of the standard fluid is
o Specific weight
o Specific volume
o Specific gravity
3. The viscosity of liquids increases with the increase of temperature while the viscosity of gases
decreases with the temperature increase.
o True
o False
4. − − − − − is used to measure small differences in gas pressures.
o Piezometer tube.
o Differential manometer
o Inclined-tube manometer
o U-tube manometer
5. The pressure of fluid at rest is independent of pressure direction as long as there are no
shearing stresses present.
o True
o False
6. In − − − − − flow, the velocity at a given point may differ from other points along the
streamline but do not change with time.
o Uniform
o Non-uniform
o Steady
o Non-steady

7. When the application requires a great amount of power, pneumatic system is used.
o True
o False
8. − − − − − lies along the median line of the body which divides the shape into two equal
parts.
o Center of pressure (Cp)
o Centroid (C)
o Center of gravity (CG)
9. In laminar flow, each particle of the fluid follows a smooth path, usually at low velocities,
which never interferes with one another.
o True
o False
10. − − − − − is a control valve that reduces the input pressure of a fluid to a desired value
keeping the operating pressure constant.
o Relieve valve
o Regulator valve
o Check valve
o Shut off valve

Consider Wein bridge oscillator. If R1 = 3R2 and C2 = 4C1, find the expression for cutoff
frequency. What will be the value of β and the required gain?

An ideal long-base Si p-n diode has N_a = 10¹⁷ cm^-3, N_d = 7x10¹⁶ cm^-3 and a cross-sectional area of 10^-3 cm². (i) If τ_n = τ_p = 1 µs, calculate the current flowing through the junction under an applied bias of 0.4V. Repeat your calculation for a temperature of 500 K. (ii) Sketch the thermal equilibrium band edge diagram of the p-n junction for both temperatures

A 400 V dc shunt motor has a rated armature current of 76 A at a speed of 1000 rpm. The armature resistance of the motor is 0.4ohm, the field resistance is 100 ohm, and the rotational losses are 0.9 kW. The load of the motor is bidirectional. Calculate the following:

(a) No-load speed of the motor.

(b) Motor speed, where the armature current is 60 A during regenerative braking.

(c) Developed torque during regenerative braking.

(d) Back electromotive force, ea during regenerative braking.

(e) Power delivered by the source under normal motor operation.

(f) Terminal current under regenerative braking.

(g) Generated power during regenerative braking.

h) Total losses under regenerative braking.

(i) Power delivered to the source under regenerative braking.

Explain the similarities and differences between convolution of discrete signals and convolution of continuous signals

Compare the brushed motor (DC motor) and a brushless motor (Induction Motor) in FIVE aspects.

-What is the importance of determining the characteristics (Zin, Zo, AV, Ai) of the voltage amplifier (BJT) ?

- What is the importance of using the capacitors (CB, CC, and CE) in voltage amplifiers (BJT) ?

Consider a secure communication channel where communication will start if the receiver detects the following sequence:

A=1, B=0 --> A=0, B=0 --> A=0, B=1

Draw a FSM state diagram with 2 inputs, first input (A), and second input (B), 1 output signal: correct sequence (Seq_detected). Create a Verilog code for this FSM and use the testbench to verify its correct operation.

Even just a state diagram would help. Thanks

Differentiate between Verbal and Non-Verbal Communication. Which one is preferred by researchers in engineering field?

how to calculate External Quantum Efficiency from I-V-L graph? Explain in details.

When we choice the Energy or Coenergy as the state function in determination of magnetic force and torque ?