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Electrical Engineer (Qatar Exam) Test-5

20 Questions - Developed by: - Developed on: 2022-05-17 - 590 taken

Qatar engineering registration exam preparation

1

A copper cable used in a plain old telephone service line has a loss of 1.5 dB/km. What is the approximate loss experienced if the user is located 1.5km from a central office?

220 dB
15 dB
20 dB
1.5 dB

2

A lossy transmission line is used to connect a transmitter to an antenna. If the VSWR measured at the antenna end of the transmission line is 1.5, which of the following statement is correct?

The characteristic impedance of the antenna matches exactly the character impedance as the transmission line
The VSWR measured at transmitter end of the transmission line is equal to 1.5
The VSWR measured at transmitter end of the transmission line is smaller than 1.5
The VSWR measured at transmitter end of the transmission line is greater than 1.5

3

Which of the following characteristics is not typical of a project manager:

Manages independently of the formal organization 64.
Possesses in depth technical knowledge
Managing a temporary activity
Managing a non-repetitive activity

4

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be:

90
1.25
100
10

5

A de current of 50A is flowing in an isolated wire. The magnitude of the magnetic field intensity, H (A/m), 10cm from the center of the wire is: H= I/2πr

43
80
8
0.5

6

Which type of braking is used in an induction motor:

All of the above
Regenerative
Plugging
Dynamic

7

What is the common or usual method to ensure that the final set of construction documents satisfy the clients program and design goals?

Make a checklist program requirement for the staff working on the project of use to continuously monitor their progress as they prepare the drawings.
Have another architect who is unfamiliar with the project review the final set for compliance with the original program requirement.
Hold regular progress meetings with the client and staff involved to compare the current status of the drawings with the original program requirements. At the conclusion of this phase, require that the client provide the architect with written approval to proceed to the next phase.
Have the client review a final check set for compliance with the program requirements and request that any corrections be noted.

8

In a cascade amplifier, to reduce the loading effect at the output, the output impedance of the last stage should be:

Very high
Very small
Intermediate

9

In a cascade amplifier, to reduce the loading effect at the input, the input impedance of first stage should be:

Intermediate
Very small
Very high

10

In which of the following circuit will the voltage source produce the most current:

10 Volt across a 10 Ohm Resistance
10 Volt across two 10 Ohm Resistance in Series
10 Voltage across two 10 Ohm resistance in parallel
1000 V across 1 MOhm resistance

11

Which of the following theorem is used for frequency?

Kirchhoff
Shannon Theorem
Muller

12

The main cause of transformer humming is:

Vibrations in the insulating and cooling oil
None of the above
Vibrations in the core lamination
Vibration in the bushes

13

If the induction motor speed at no-load is 745 RPM, what is the speed of the motor?

800 RPM
750 RPM
700 RPM
850 RPM

14

Synchronous speed for motor 1600 RPM, 60hz, Calculate number of poles.

P = 2
P = 6
P = 4

15

At what region of operation is the base emitter junction forward biased and the based collector junction reverse biased for BJT?

Linear or active
Saturation
Cut-off
None of the above

16

What is the role of the Zener diode?

Voltage regulation
Rectification
Amplification

17

The heat loss inside a straight conductor is 60J upon applying current I for 5s. If the resistance of the conductor is decrease to half, and the same current is applied for 5s, what will be the heat dissipation?

60J
30J
120J
15J

18

Why we use power factor correction device to:

None of the above
Getting PF
Increase PF
Mitigate PF

19

Rotor of induction motor is rotating at synchronous speed, what is torque?

High
Low
Zero
Infinity

20

The underground cable is laid in a marine environment at system voltage A. What shall be the design of the cable insulation?

(1/√3) A
√3 A
2 A
√2 A

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