# Electrical Engineer (Qatar Exam) Test-20

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Qatar engineering registration exam preparation

• 1
A single-phase transformer rated 100/7.2 kV has an impedance of 10.0%. During a factory short circuit test done at rated current, the voltage lev applied to the HV terminals will be most nearly:
• 2
Consider the oscillator circuit shown below. This circuit uses which resonant mode(s) of the crystal XI?
• 3
The output is to be maintained at 24 V, while the input varies from 120 V to 126 V with a load current ranging from 0 A to 5A. Assume ideal conditions, that is, keep alive current is zero and the Zener resistance, Rz, is negligible

• 4
The resistance of an electric bulb drawing 1.2 A current at 6.0 V is
• 5
The travelling cranes are mostly driven by:
• 6
A project manager is supervising construction of a medium-sized part assembly workshop. He submits a report to his boss indicating the cost breakdown of the foundation and framing work based on the soil analysis and loading specifications for the building. The total came to \$25,000. His boss then told him to do whatever it takes to get that figure down to
\$20,000. He should:

• 7
A wristwatch mercury cell has a capacity of 200 x 10" AH. How many months can the watch function without replacement if it draws 15 x 10"6 A? Hint (Dh=1t/)
• 8
The most important end state of project initiation is:
• 9
The OP-AMP circuit performs the function of:
• 10
Hr/day for 300 days/year. After 10 years, the system has a salvage value of \$10,000. Assuming the interest rate is constant at 10%, the total annualized cost over the 10-year life is most nearly:

• 11
You received an invoice from your computer’s supplier for me full amount of the purchase order in looking at the purchase order terms, you find that if says" Seller to provide twenty
(25) computers". However, you have received only (20) computers. What should you do?
• 12
An underground system is built for a military marine system with a normal voltage level, A. Following fault analysis design, the insulation of the distribution system is selected, what is most nearly the voltage level for which the insulation on the distribution system is designed? (1/V2A)
• 13
The source voltage in the circuit shown is v=l00sin 377t, the peak reverse voltage applied to the diode would be
• 14
To make sure that an instrument did not drift with time, we need to
• 15
For the 4-wire RTD Circuit shown, which of the following would case the greatest measurement error in Vsense?
• 16
If the collector supply voltage is 12 V and the resistor is 400Ω, what is the condition of the transistor at time t2?

• 17
All the followings are true about work Packages except
• 18
It is proposed that two 3 phase transformers be connected in parallel to serve a large load. Transformer 1 is wye-delta, and Transformer 2 is wye-wye. Which of the following statements is most correct?
• 19
The initial investment for a project is 2.0 million QR. A net annual profit of 150,000 QR is anticipated. Using a 10% desired rate of return on the investment that is the payback period for the project?
• 20
In the circuit below, Switch S 1 closes at t= O. The diode D is rated at a maximum peak current of 5 A. Assume that the initial charge on the capacitor is zero. The minimum value of R
(n) to prevent exceeding the diode maximum peak current is most nearly.