MCQ with Answers on Electrical Engineering 2

1-The steady-state error of a feedback control system with an acceleration input becomes finite in a
(A) Type 0 system.
(B) Type I system.
(C) Type 2 system.
(D) Type 3 system.
(Answer: C)
2-A good control system has all the following features except
(A) Good stability
(B) Slow response
(C) Good accuracy
(D) Sufficient power handling capacity
(Answer: B)
3-Which of the following is the best method for determining the stability and transient response?
(A) Root locus
(B) Bode Plot
(C) Nyquist plot
(D) None of the above
(Answer: A)
4-Addition of zeros in transfer function causes which of the following?
(A) Lead-compensation
(B) Lag-compensation
(C) Lead-lag compensation
(D) None of the above
(Answer: 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?
(A) P
(B) PI
(C) ID
(D) PID
(Answer: D)
6-Maxwell’s equations involve ________.
(A) Charge density
(B) Current density
(C) Magnetic intensity
(D) All of these
(Answer: D)
7-Which of the following is a low-gain antenna?
(A) Dish antenna on a space craft
(B) Wi-Fi antenna
(C) Both a. and b.
(D) None of the above
(Answer: B)
8-Gold and silver are
(A) Dielectric materials
(B) Low resistivity conducting materials
(C) Magnetic materials
(D) Insulating materials
(Answer: B)
9-Hall effect may be used for which of the following
(A) Determining whether the semiconductor is p or n type
(B) Determining the carrier concentration
(C) Calculating the mobility
(D) Al of the above
(Answer: A)
10-The property due to which the resistance of some metal or compound vanishes under certain conditions is known as
(A) Semi conductivity.
(B) Magnetostriction.
(C) Curie point.
(D) Super conductivity.
(Answer: D)
11-A 32 to 1 multiplexer has the following features.
(A) 32 inputs, one output and 5 control signals
(B) 32 outputs, one input and 5 control signals
(C) 5 inputs, one control signal and 32 outputs
(D) 5 inputs 32 control signals and one output
(Answer: A)
12-How many comparators would a 12-bit flash ADC require?
(A) 4095
(B) 3095
(C) 4000
(D) 2512
(Answer: A)
13-In a sample and hold circuit the following statement is false:
(A) Sample time is much smaller than hold time.
(B) Aperture time is the delay between the time that the pulse is applied to the switch and the actual time the switch closes.
(C) Acquisition time is the tin-re it takes for the capacitor to charge from one voltage to another voltage.
(D) The voltage across the hold capacitor changes by 50% during hold time.
(Answer: A)
14-The fastest switching logic family is
(A) CMOS
(B) TTL
(C) DTL
(D) ECL
(Answer: D)
15-A bridge rectifier provides 50mA current at 150V, the average current and PIV rating of each diode, respectively are:
(A) 79mA, l67V
(B) 25mA, 236V
(C) 12.5mA, l67V
(D) 25mA, l20V
(Answer: B)
16-Compared to bipolar transistor, a JFET has
(A) Lower input impedance
(B) Higher voltage gain –
(C) Higher input impedance and high voltage gain
(D) Higher input impedance and low voltage gain
(Answer: D)
17-Input impedance of MOSSFET is
(A) less than of FET but more than BJT
(B) More than that of FET and BJT
(C) more than that of FET but less than BJT
(D) less than that of FET and BJT
(Answer: B)
18-A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder?
(A) 12K
(B) 14K
(C) l6K
(D) 64K
(Answer: C)
19-The decimal value for the BCD coded number 000100l0 is
(A) 6
(B) 10
(C) 12
(D) 18
(Answer: C)
20-In a DMA write operation the data is transferred
(A) From I/O to memory.
(B) From memory to I/O.
(C) from memory to memory.
(D) from I/O to I/O.
(Answer: A)