#1
6th May 2015, 09:53 AM
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DMRC previous year question paper for ECE
Here I am looking for DMRC Delhi Metro Rail Corporation Junior Engineer Electrical Communication Engineering previous year question paper for better preparation, I searched but not found, so now will you please provide here???
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#2
19th May 2018, 09:18 PM
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Re: DMRC previous year question paper for ECE
Can you provide me previous year question paper for DMRC (Delhi Metro Rail Corporation) JE (Electronics) Post recruitment as I need it for preparation of the exam?
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#3
19th May 2018, 09:21 PM
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Re: DMRC previous year question paper for ECE
The previous year question paper for DMRC (Delhi Metro Rail Corporation) JE (Electronics) Post recruitment is as follows: Technical Aptitude Questions 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 |
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