LMRC Assistant Manager Operation Electronics Previous Year Paper | UPMRC Previous Year Paper
Lucknow Metro Rail Corporation (LMRCL) Assistant Manager Operation Electronics Shift 2 Paper 12th May 2018
| Sr.No. | Question |
| 1 | A network has 7 nodes and 5 independent loops. The number of branches in the network will be
(a) 5 (b) 7 (c) 11 (d) 12 Ans –(d) |
| 2 | The number of independent loops for a network with n nodes and b branches is
(a) n – 1 (b) b – n + 1 (c) b – n (d) n – b Ans –(b) |
| 3 | The nodal method of circuit analysis is based on
(a) KVL and Ohm’s Law (b) KVL and KCL (c) KVL and Thevenin’s Law (d) KCL and Ohm’s Law Ans –(d) |
| 4 | Three equal resistances of 3 Ohms are connected in a Star circuit. What is the resistance in one of the arms of an equivalent Delta circuit?
(a) 30 Ohms (b) 20 Ohms (c) 90 Ohms (d) 27 Ohms Ans – (c) |
| 5 | Three equal resistances of 12 Ohms are connected in a Delta circuit. What is the resistance in one of the arms of an equivalent Star Circuit?
(a) 4 Ohms (b) 8 Ohms (c) 12 Ohms (d) 16 Ohms Ans –(a) |
| 6 | Norton’s equivalent circuit consists of
(a) Voltage source in parallel with resistance (b) Voltage source in series with resistance (c) Current source in parallel with resistance (d) Current source in series with resistance Ans –(c) |
| 7 | Superposition theorem is NOT applicable to networks containing
(a) Non – linear elements (b) Dependent current sources (c) Dependent voltage sources (d) Transformers Ans –(a) |
| 8 | A sine wave source supplies a sine wave of 10 V, 10 KHz to a circuit consisting of a 100 Ohms resistance in series with a parallel combination of two inductances of 2 mH and 5 mH. Find the total current in the circuit.
(a) 54.46 mA (b) 88.76 mA (c) 74.42 mA (d) 96.86 mA Ans – (c) |
| 9 | The admittance of an RC circuit is 0.0024 S and the applied voltage is 10 V. What is the total current?
(a) 12 mA (b) 24 mA (c) 48 mA (d) 96 mA Ans –(b) |
| 10 | The phase angle between the capacitor current and applied voltage in a parallel RC circuit is
(a) 90 degree (b) – 90 degree (c) 45 degree (d) 180 degree Ans –(a) |
| 11 | A function f(t) is said to be even when it is equal to
(a) – f(t) (b) f(-t) (c) f(-2t) (d) f(2t) Ans – (b) |
| 12 | The group delay is defined as
(a) negative of the slope of the phase versus frequency plot (b) slope of the amplitude versus frequency plot (c) negative of the slope of amplitude versus frequency plot (d) negative of the slop of amplitude versus phase plot Ans –(a) |
| 13 | The band gap of the forbidden band in a semiconductor is of the order of
(a) 10 eV (b) 5 eV (c) 1 eV (d) 8 eV Ans –(c) |
| 14 | The diffusion hole current density Jp is proportional to
(a) The concentration of neutrons (b) The concentration gradient dp/dx (c) The concentration of positrons (d) The concentration gradient of positrons Ans –(b) |
| 15 | What is the frequency of the square wave generated when a 100 Hz sine wave is fed to a zero crossing detector using a single operational amplifier (OPAMP)?
(a) 50 Hz (b) 100 Hz (c) 150 Hz (d) 200 Hz Ans –(b) |
| 16 | The Boolean expression for XNOR (Equivalence) logic function with inputs X and Y is
(a) X’Y’ + XY (b) XY’ + X’Y (c) X’Y + XY (d) XY’ + XY Ans –(a) |
| 17 | What is the fundamental frequency of oscillation of a ring oscillator, consisting of 5 NOT gates connected in a loop, each having a propagation delay of 100 picoseconds?
(a) 100 MHz (b) 1 GHz (c) 10 GHz (d) 100 GHz Ans –(b) |
| 18 | The relation between the number of full adders n and the number of bits m in a parallel adder is
(a) n = m +1 (b) n = m (c) n = m – 1 (d) n = m + 2 Ans –(c) |
| 19 | What is the minimum number of 2 : 1 MUXs needed to implement a 2-input AND gate and a 2-input XOR gate?
(a) 4 and 4 (b) 3 and 3 (c) 2 and 2 (d) 1 and 1 Ans –(d) |
| 20 | How many states does a 4-bit ripple counter have?
(a) 4 (b) 8 (c) 16 (d) 20 Ans –(c) |
| 21 | What is the minimum number of flip-flops needed to design a divide – by – 30 counter?
(a) 4 (b) 5 (c) 6 (d) 7 Ans –(b) |
| 22 | A dynamic RAM consists of
(a) 4 transistors (b) 2 transistors and 2 capacitors (c) 1 transistor and 1 capacitor (d) 3 transistors and 2 capacitors Ans – (c) |
| 23 | The amount of directly addressable memory in bytes by Intel 8085 microprocessor is
(a) 32 K (b) 128 K (c) 1024 K (d) 64 K Ans –(d) |
| 24 | The lead compensator is basically a
(a) High pass filter (b) Low pass filter (c) Band pass filter (d) Band reject filter Ans –(a) |
| 25 | What is the bandwidth needed for an FM signal in which the modulating frequency is 4 KHz and the maximum deviation is 20 KHz?
(a) 16 KHz (b) 32 KHz (c) 64 KHz (d) 80 KHz Ans –(c) |
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