#1
10th April 2015, 02:10 PM
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DMRC Electrical Paper
I am very much prepared for DMRC Junior Engineer entrance exam but I am little week in Electical Paper. Can you suggest me some books to clear and prepare DMRC Electrical Paper. I need book that contain the basic notes along with the old question papers.
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#2
17th May 2018, 11:49 AM
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Re: DMRC Electrical Paper
I want the sample Electrical Engineering question paper of Delhi Metro Rail Corporation DMRC Ltd so will you provide me?
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#3
17th May 2018, 11:50 AM
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Re: DMRC Electrical Paper
I am providing you the sample Electrical Engineering question paper of Delhi Metro Rail Corporation DMRC Ltd DMRC Exam Electrical Engineering question paper 1. Which one of the following statements is correct? Digital modulation techniques are used in satellite communication systems since: (1) They are easier to handle (2) Large bandwidth utilization is possible (3) They have a higher spectral efficiency (4) They are less prone to interference Answer : They are less prone to interference 2. How many bits are required to encode 32 level PCM: (1) 6 (2) 5 (3) 4 (4) 3 Answer : 5 3. The noise is more dominant in which of the following: (1) PAM (2) PWM (3) PPM (4) FSK Answer : PAM 4. The phase velocity of wave propagating in a hollow metal wave guide is: (1) Greater than the velocity of the light in free space (2) Less than the velocity of the light in free space (3) Equal to the velocity of the light in free space (4) Equal to the group velocity Answer : Greater than the velocity of the light in free space 5. The magnitude of the open-circuit and short circuit input impedance of a transmission line are 100 ohm and 25 ohm respectively. The characteristic impedance of line is: (1) 25 ohm (2) 50 ohm (3) 75 ohm (4) 100 ohm Answer : 50 ohm 6. The line of sight communication requires transmit and receive antenna to face each other. If the transmit antenna is vertically polarized, for the best reception the receive antenna should be: (1) Horizontally polarized (2) Vertically polarized (3) At 45 with respect to the horizontal polarization (4) At 45 with respect to the vertical polarization Answer : Horizontally polarized 7. A network contains linear resistance and ideal voltage source. If the value of all the resistors are doubled, then the voltage across each resistor is: (1) Halved (2) Doubled (3) Increased by four times (4) Not changed Answer : Not changed 8.Twelve 1 ohm resistances are used as edge to form a cube. The resistance between two diagonally opposite corners of the cube is: (1) 5/6 ohm (2) 1 ohm (3) 6/5 ohm (4) 3/2 ohm Answer : 5/6 ohm 9. An eight bit digital data 10101100 is fed to an ADC. The reference voltage is +10V. The analog output voltage will be: (1) 1.05V (2) 6.74V (3) 10.10V (4) 5.15V Answer : 6.74V 10. A series RLC circuit has a resonant frequency of 1 KHz and a quality factor Q = 100. If each of the R,L and C is doubled from its original value, the new Q of the circuit is: (1) 25 (2) 50 (3) 100 (4) 200 Answer : 200 11. The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output is: (1) The in-phase component (2) The quadrature-component (3) Zero (4) The envelope Answer : Zero 12. Gunn diode is a: (1) Negative resistance device (2) Positive resistance device (3) High noise device (4) Low frequency device Answer : Negative resistance device 13. The intrinsic carrier concentration of silicon sample at 300 K is 2.5 1016/m3. If after doping, the number of majority carriers is 5 1020 /m3, the minority carrier density is: (1) 1.25 1012/m 3 (2) 0.125 1012/m3 (3) 2.5 1020/m3 (4) 0.5 104/m3 Answer : 1.25 1012/m 3 14. The unit of ? H is: (1) Ampere (2) Ampere/meter (3) Ampere/meter2 (4) Ampere-meter Answer : Ampere/meter2 15. A PIN diode is: (1) A metal semiconductor point-contact diode (2) A microwave mixer diode (3) Often used as a microwave detector (4) Suitable for use as a microwave switch Answer : Suitable for use as a microwave switch 16. 11001, 1001 and 111001 correspond to the 2s complement representation of which one of the following sets of number? (1) 25, 9 and 57 respectively (2) 6, 6 and 6 respectively (3) 7, 7 and 7 respectively (4) 25, 9 and 57 respectively Answer : 7, 7 and 7 respectively 17. To couple a coaxial line to a parallel wire line, it is best to use a: (1) A slotted line (2) Balun (3) Directional coupler (4) Quarter wave line transformer Answer : Balun 18. Which of the following is used extensively where lowest power consumption is necessary? (1) CMOS (2) NMOS (3) PMOS (4) Any of the abov Answer : CMOS 19. Reflex klystron is a: (1) Low power generator (2) High power oscillator (3) Low gain amplifier (4) Not an oscillator Answer : Low power generator 20. If the radiated power of AM transmitter is 10 KW, the power in the carrier for modulation index of 0.6 is nearly: (1) 8.24 KW (2) 9.26 KW (3) 8.47 KW (4) 9.6 KW Answer : 8.47 KW 21. The current through 8 ohms branch is: (1) 1A (2) 0.5A (3) 1.5A (4) None of these Answer : 0.5A 22. JFET in properly biased condition acts as a: (1) Current controlled current source (2) Voltage controlled voltage source (3) Voltage controlled current source (4) Impedance controlled current source Answer : Voltage controlled current source 23. The circuit shown in figure is best described as a: (1) Bridge rectifier (2) Ring modulator (3) Frequency discriminatory (4) Voltage doubler Answer : Voltage doubler 24. Which amplifier will be preferred for highest gain? (1) Darlington pair (2) Cascade amplifier (3) Cascode amplifier (4) Depends on the circuitry Answer : Cascode amplifier 25. The Boolean expression for the truth table shown is: Answer : Option 1 26. Without any additional circuitry, an 8:1 MUX can be used to obtain: (1) Some but not all Boolean functions of 3 variables (2) All function of 3 variables but none of 4 variables (3) All functions of 3 variables and some but not all of 4 variables (4) All functions of 4 variables Answer : All functions of 4 variables 27. The resolution of a potentiometer should be: (1) Zero (2) Low (3) High (4) Infinite Answer : Infinite 28. Negative feedback in amplifier: (1) Improves the SNR at input (2) Improve SNR at output (3) Reduces distortion (4) Decreases bandwidth Answer : Reduces distortion 29. Spectral density expresses: (1) Average voltage (2) Average current (3) Average power in a waveform as a function of frequency (4) None of these Answer : Average power in a waveform as a function of frequency 30. Which of the following is used as a data selector? (1) Encoder (2) Decoder (3) Multiplexer (4) De-multiplexer Answer : Multiplexer 31. If a signal x(n)=x(n), then it is called ____ signal: (1) Odd (2) Energy (3) Power (4) Even Answer : Even 32. The response of an LTI/LSI system is given by the _______ of input and impulse response: (1) Convolution (2) Correlation (3) Superposition (4) None Answer : Convolution 33. Companders are used in communication systems to: (1) Compress bandwidth (2) To improve frequency response (3) To improve signal to noise ratio (4) None of these Answer : To improve signal to noise ratio 34. ICB0 in a transistor can be reduced by reducing: (1) IB (2) VCC (3) IE (4) Temperature Answer : Temperature 34. Light is confined within the core of a simple optical fiber by: (1) Refraction. (2) Total internal reflection at the outer edge of the cladding. (3) Total internal reflection at the core cladding boundary. (4) Reflection from the fibers plastic coating. Answer : Total internal reflection at the outer edge of the cladding. 36. The complement of AB+BC+CD is: (1) ACD+BC+BD (2) AC+BC+ABD (3) AC+BC+ABD (4) AC+BC+ABD Answer : ACD+BC+BD 37. The following expression when simplified will become XY(XYZ +XYZ+XYZ) (1) 0 (2) 1 (3) 1 (4) X Answer : 0 38. In a PCM system of telemetry, the quantization noise depends on: (1) The sampling rate and quantization level (2) The sampling rate only (3) The number of quantization level (4) Information provided is not sufficient Answer : The number of quantization level 39. In PCM system, if we increase the quantization levels from 2 to 8, the relative bandwidth requirements will: (1) Be doubled (2) Remain same (3) Be tripled (4) Becomes eight times Answer : Be tripled 40. The modulation system inherently most noise resistant is: (1) Frequency modulation (2) Pulse width modulation (3) Pulse code modulation (4) Phase modulation Answer : Pulse code modulation Last edited by pawan; 17th May 2018 at 11:53 AM. |
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