The BHEL exam held on 29 sep 2009 for Engineer Traines question is listed below with some questions solved.
1. Half Adder can be built using
1. 1 X-OR and 2 AND Gates
2. 1 X-OR and 2 NAND Gates
3. 1 X-OR and 1 NAND Gate
4. 2 X-OR gate and 1 NAND Gate
5. 2 AND gates and 2 NAND gates
Ans: 1 X-OR and 2 NAND Gates
2. The antenna resistance is 30 ohm and radiation resistance is 70 ohm, the efficiency of antenna in
1. 35% 2. 70% 3. 30% 4.----------
3. A plant having transfer function of G(S) =1/S^2+.2S+1, the step response settle with in 2% to final value in about
1. 10 sec 2. 20 sec 3. 30 sec 4. 40sec 5. 50 sec
4. A pulse code modulation system has quantization level of 16 and maximum signal frequency of 4 kHz. the bit transmission rate is
1. 8khz 2. 16khz 3. 32khz 4. 64kHz
5. The waveguide section in microwave circuit is
1. low pass filter 2. High pass filter 3. All pass filter 4. Band pass filter 5. Band stop filter
6. The low junction capacitance in schottzky diode results in
1. faster switching 2. Operation in high frequency 3. For relatively iow current application
4. 1&3 5. 1,2,3
7. CDMA is better than TDMA because
1. the output voice signal in digitized & compressed
2. dynamic bandwidth allocation
3. high efficient spectrum
4. 1,2,3 or 2,3
8. In series RLC circuit, R=10 Ohm , L=0.1 Ohm & C= 100 micro farad, is connected to voltage supply V=100+141.4 sin (500 t), the DC component of current
1. 0.707 A 2. 10 A 3. 2 A 4. 0 A 5. 1.414 A
9. In series RC circuit , the current is _________ voltage by and angle
1. Lag 0 degree 2. Lag 90 degree 3. Lead b/w 0 and 90 degree 4. Lead b/w 90 and 180 degree 5. Lead 90 degree.
10. The PCI (implemented by 32 bit) the maximum clock rate is
1. 11 MHz 2. 110 MHz 3. 33 MHz 4. 66 MHz 5. 100 MHz
11. Using Boolean algebra (((AB)’C)’D)’ equation can be simplified
1. (A’+B’)C+D’ 2. A’+B’+C’+D’ 3. A+B’+C+D’ 4. A’+B’+C+D’
Ans: (A’+B’)C+D’
12. A dual slope analog to digital converter has N bit counter when input voltage Va is being integrated and applied, then the counter is allowed to count
1. propotional to Va 2. inversly propotional to Va 3. equal to 2N 4. equal to 2^N-1 4. equal to N^2
13. Convolution of square wave with itself in
1. Square function 2. Sinc function 3.rectangular function 4.none of these 5. Triangle function
14. Biased clamper shifts input signal
1. Above dc reference voltage 2. below dc reference voltage 3. above or below dc reference voltage 4. Above or below dc reference voltage other than 0V 5. Above ore below 0V
15. How many minimum number of address lines are required to address each memory location of 2048*4 memory chip
1. 8 2. 10 3. 16 4. 34
16. A transformer in a static electric devices
1.converter ac signal to dc signal 2.converter dc signal to ac signal 3.convert ac supply frequency to ac signal
17. The truth table corresponds to
INPUT OUTPUT
Low high high
Low high low
High low low
High high low
1. positive logic NAND gate 2. Positive logic NOR gate 3. Negative logic NOR gate 4.X_OR gate 5.AND gate
18. Cryogenics is study of
19. Cybernetics is related to
20. Entropy is a measure of
1.disorderness
21. In adiabatic and irreversible process entropy is
22. Laser is made up of __________ material.
23. The silicon is available in earth crust of what percentage_________.
24. Electric bulb is invented by Edison.
25. Transistor is invented by W.Schokley.
26. The MKS unit of Power _________.
27. The MKS unit of Electric Field ___________.
28. The MKS unit of Energy __________.
29. The forward voltage to the SCR can be applied after _________.
30. The diode is connected anti parallel to thee thyristor what happens to turn off time and turn off power?
31. The IC used for BCD to Seven Segment decoder is ________.
32. The IC used for connection b/w 8086 and ADC is ________.
33. The decimal equivalent of 1110101 is _______.
34. The value ‘10001’ in binary corresponds to _______.
35. 555 timer has ________ like Capacitor,Divider Resistance N/W,Transistor,Comparator.
36. The open cut off frequency of u741 IC depends on _______
37. The Stochastic is related to Probability Variable.
38. The efficiency of Carnot’s engine is ________.
39. The liquid state obtained in the blast furnace ( IRON) is _________.
40. In a microprocessor,the register which holds the address of next address of next instruction to be fetched is
1. Accumulator 2. Program Counter 3. Stack Pointer 4. Instruction Register
41. Bronze is an alloy of
1. Copper and tin 2. Copper and Zinc 3. Copper and Lead 4. Lead and Tin
42. Maxwell’s bridge is used for
1. Measurement of inductance of high Q 2. Measurement of inductance of low Q
3. Measurement of inductance in terms of capacitance and resistance 4. None
43. The VVT (Voltage to Voltage Transducers) has
1. zero i/p impedance and zero o/p admittance
2. zero i/p admittance and zero o/p impedance
3. zero i/p admittance and impedance
4. Infinite i/p admittance and impedance
44. RADAR is Radio Detection and Ranging.
45. A Power Amplifier which has cross over distortion in its o/p
1. Class A 2. Class B 3. Class C 4. Class AB
46. Equipotential lines cut orthogonally with electric field.
47. Piezo electric accelometer is used _____.
1. Sudden shock environment
2. Static Vibration of acceleration measurement
3. Measurement of vibration frequency 30-40Khz
4. 1,2 5. 1,2,3
48. The opamp has slew rate of 4V/usec, the maximum signal o/p is expected to be at 1 MHz frequency is____________
49. The difference b/w incandescent and Fluorescent lamps is _________.
