MCQS for NTC Telecom Engineer Preparation
1-The steady-state error of a feedback control system with an acceleration input becomes finite in a
- Type 0 system.
- Type I system.
- Type 2 system.
- Type 3 system.
(Ans: c)
2-A good control system has all the following features except
- Good stability
- Slow response
- Good accuracy
- Sufficient power handling capacity
(Ans: b)
3-Which of the following is the best method for determining the stability and transient response?
- Root locus
- Bode Plot
- Nyquist plot
- None of the above
(Ans: a)
4-Addition of zeros in transfer function causes which of the following?
- Lead-compensation
- Lag-compensation
- Lead-lag compensation
- None of the above
(Ans: b)
5-The control system design specification for a chemical process is described as short settling time, improved damping and zero steady state error. What control do we choose?
- P
- PI
- ID
- PID
(Ans: d)
6-Maxwell’s equations involve ________.
- Charge density
- Current density
- Magnetic intensity
- All of these
(Ans: d)
7-Which of the following is a low-gain antenna?
- Dish antenna on a space craft
- Wi-Fi antenna
- Both a. and b.
- None of the above
(Ans: b)
8-Gold and silver are
- Dielectric materials
- Low resistivity conducting materials
- Magnetic materials
- Insulating materials
(Ans: b)
9-Hall effect may be used for which of the following
- Determining whether the semiconductor is p or n type
- Determining the carrier concentration
- Calculating the mobility
- Al of the above
(Ans: a)
10-The property due to which the resistance of some metal or compound vanishes under certain conditions is known as
- Semi conductivity.
- Magnetostriction.
- Curie point.
- Super conductivity.
(Ans: d)
11-A 32 to 1 multiplexer has the following features.
- 32 inputs, one output and 5 control signals
- 32 outputs, one input and 5 control signals
- 5 inputs, one control signal and 32 outputs
- 5 inputs 32 control signals and one output
(Ans: a)
12-How many comparators would a 12-bit flash ADC require?
- 4095
- 3095
- 4000
- 2512
(Ans: a)
13-In a sample and hold circuit the following statement is false:
- Sample time is much smaller than hold time.
- Aperture time is the delay between the time that the pulse is applied to the switch and the actual time the switch closes.
- Acquisition time is the tin-re it takes for the capacitor to charge from one voltage to another voltage.
- The voltage across the hold capacitor changes by 50% during hold time.
(Ans: a)
14-The fastest switching logic family is
- CMOS
- TTL
- DTL
- ECL
(Ans: d)
15-A bridge rectifier provides 50mA current at 150V, the average current and PIV rating of each diode, respectively are:
- 79mA, l67V
- 25mA, 236V
- 12.5mA, l67V
- 25mA, l20V
(Ans: b)
Source: http://scholarexpress.com/multiple-choice-questions-mcq-with-answers-on-electrical-engineering-set-2/