BHEL Placement Paper
1. Unit of Entropy (J/kg K or kJ/kg K)
2. A mass of 100kg is falling from a height of 1 m and penetrates the sand into for 1 m. What is the resistance force given by sand.
3. Ratio of specific heats of air. (1.41)
4. A body weighs 3 kg in air. If it is submerged in a liquid, it weighs 2.5 kg. What is the specific gravity of the liquid.
5. Two cars travel in same direction at 40 km/hr at a regular distance. A car comes in a opposite direction in 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between them?
6. A simple problem involving in hoops stress. For sphere: M= [3/2]*p*V*[density of pressure vessel material/Maximum working stress it can tolerate] For Thin walled pressure walls: Hoops stress or stress in the radial direction =p*r/2t
7. A problem in force calculation in a body moving in a inclined surface.
8. Composition of bronze. (Copper+zinc)
9. Compostion of stainless steel.(iron+chromium+nickel+carbon)
10 .CI is manufactured in which process. (cupola process)
11.Consider the following expressions indicating the step or impulse response of an initially relaxed control system-
1. (5 – 4e-2+) u(t)
2. (e-2t +5) (u(t))
3 .V(t) + 8e-2t u(t)
4 . V(t) + 4e-2t 4(t)
12.Which is the following relate to rational transfer function of a system-
1. Ratio of Fourier transform of output to input with zero initial conditions.
2. Ratio of Laplace transform of output to input with zero initial conditions.
3. Laplace transform of system impulse response.
13. Laplace transform of system unit step response select the correct answer using the codes given below. Codes
a.) 1 and 4
b.) 2 and 3
c.) 1 and 3
d.) 2 and 4
14.For the signal g (t) – 10 cos (50 pt) cos2 (150at) The Nyquist sampling state in t seconds is
a.) 150 samples per second
b.) 200 samples per second
c.) 300 samples per second
d.) 350 samples per second
15. In the case of a 70 MHz 1F carries for a transponder band width of 36 MHz; energy must lie between – MHz.
a.) 34 and 106
b.) 52. And 88
c.) 106 and 142
d.) 34 and 142
16.Radar used to eliminate clutter in navigational application is –
a.) Pulse radar
b.) Tracking radar
c.) MTI radar
d.) Mono pulse radar
17.The 1.55 mm windows is not yet in use with fiber optic systems because –
a.) The attenuation is higher than at 0.85 mm
b) The attenuation is higher than at 1.3mm
c.) Suitable laser devices have not yet been developed
d.) It does not lend itself to wavelength multiplexing
18.Pre-emphasis in FM systems involves-
a.) Compression of the modulating signal
b.) Expansion of the modulating signal
c.) Amplification of lower frequency components of the modulating signal.
d.) Amplification of higher frequency components of the modulating signal.
19.In a terrestrial microwave system transmission of signals is achieved through-
a.) reflection from the ionosphere
b.) line of sight mode
c) reflection from the ground
d.) diffraction from the stratosphere.
20.Casse grain feed is used with a parabolic reflector to
a.) increase the gain of the system
b). increase the bandwidth of the system
c.) reduce the size of the main reflector
d.) allow the feed to be placed at a convenient point.
21. What kind of abrasive cut off wheel should be used to cut concrete, stone and masonry? =Diamond grit.
22. In break-even analysis, total cost consists of: = Fixed cost + Variable cost.
23. The amount deducted from the salary of workers towards employees provident fund is : =deposited in the account of worker with Provident Fund Commissioner.
24. PERT is: = event oriented technique
25. Bar charts are suitable for: = minor works.
26. ? on a PERT/CPM chart represents: = a significant event representing some mile-stone
27. Electron volt is the unit of : = Energy.
28. Seamless tubes are made by?
29. Reheating in gas turbine results in: = increase of work ratio and decrease of thermal efficiency.
30. Why DC current is not used in transformer?
31. When a generator of internal impedance and operating at 1GHz feeds a load via a coaxial line of characteristic impedance 50 ohm then the voltage wave ratio on the feed line is –
a.) 0.5
b.) 1.5
c.) 2.5
d.) 1.75
32. The coding system typically used in digital telemetry is –
a.) PPM (pulse position modulation)
b.) PAM (pulse amplitude modulation)
c.) PCM (pulse code modulation)
d.) PDM (pulse duration modulation)
32.Radiation pyrometers are used for the measurement of temperature in the range of –
a.) -2000C to 5000C
b.) 00C to 5000C
c.) 5000C to 12000C
d.) 12000C to 25000C
34.RF amplifier of an A.M. receiver is normally biased in –
a.) Class 'A'
b.) Class 'b'
c.) Class 'C'
d.) None
35.The value of gate voltage for the operation of enhancement of only N channel MOSFET has to be –
a.) High positive
b.) High negative
c.) Low positive
d.) Zero
36. The spark plug gap is normally maintained at: = 0.45 to 0.6mm
37. A distributor in spark ignition engines performs the function of : = Providing the correct firing order in engine
38. Which of the following does not relate to C.I. engine:: a) fuel pump b) fuel injector c) governor d) carburetor e) flywheel = (d)
39. Air fuel ratio in a jet engine is = 60:1
40. What is the value of Prandtl No.?
1. Unit of Entropy (J/kg K or kJ/kg K)
2. A mass of 100kg is falling from a height of 1 m and penetrates the sand into for 1 m. What is the resistance force given by sand.
3. Ratio of specific heats of air. (1.41)
4. A body weighs 3 kg in air. If it is submerged in a liquid, it weighs 2.5 kg. What is the specific gravity of the liquid.
5. Two cars travel in same direction at 40 km/hr at a regular distance. A car comes in a opposite direction in 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between them?
6. A simple problem involving in hoops stress. For sphere: M= [3/2]*p*V*[density of pressure vessel material/Maximum working stress it can tolerate] For Thin walled pressure walls: Hoops stress or stress in the radial direction =p*r/2t
7. A problem in force calculation in a body moving in a inclined surface.
8. Composition of bronze. (Copper+zinc)
9. Compostion of stainless steel.(iron+chromium+nickel+carbon)
10 .CI is manufactured in which process. (cupola process)
11.Consider the following expressions indicating the step or impulse response of an initially relaxed control system-
1. (5 – 4e-2+) u(t)
2. (e-2t +5) (u(t))
3 .V(t) + 8e-2t u(t)
4 . V(t) + 4e-2t 4(t)
12.Which is the following relate to rational transfer function of a system-
1. Ratio of Fourier transform of output to input with zero initial conditions.
2. Ratio of Laplace transform of output to input with zero initial conditions.
3. Laplace transform of system impulse response.
13. Laplace transform of system unit step response select the correct answer using the codes given below. Codes
a.) 1 and 4
b.) 2 and 3
c.) 1 and 3
d.) 2 and 4
14.For the signal g (t) – 10 cos (50 pt) cos2 (150at) The Nyquist sampling state in t seconds is
a.) 150 samples per second
b.) 200 samples per second
c.) 300 samples per second
d.) 350 samples per second
15. In the case of a 70 MHz 1F carries for a transponder band width of 36 MHz; energy must lie between – MHz.
a.) 34 and 106
b.) 52. And 88
c.) 106 and 142
d.) 34 and 142
16.Radar used to eliminate clutter in navigational application is –
a.) Pulse radar
b.) Tracking radar
c.) MTI radar
d.) Mono pulse radar
17.The 1.55 mm windows is not yet in use with fiber optic systems because –
a.) The attenuation is higher than at 0.85 mm
b) The attenuation is higher than at 1.3mm
c.) Suitable laser devices have not yet been developed
d.) It does not lend itself to wavelength multiplexing
18.Pre-emphasis in FM systems involves-
a.) Compression of the modulating signal
b.) Expansion of the modulating signal
c.) Amplification of lower frequency components of the modulating signal.
d.) Amplification of higher frequency components of the modulating signal.
19.In a terrestrial microwave system transmission of signals is achieved through-
a.) reflection from the ionosphere
b.) line of sight mode
c) reflection from the ground
d.) diffraction from the stratosphere.
20.Casse grain feed is used with a parabolic reflector to
a.) increase the gain of the system
b). increase the bandwidth of the system
c.) reduce the size of the main reflector
d.) allow the feed to be placed at a convenient point.
21. What kind of abrasive cut off wheel should be used to cut concrete, stone and masonry? =Diamond grit.
22. In break-even analysis, total cost consists of: = Fixed cost + Variable cost.
23. The amount deducted from the salary of workers towards employees provident fund is : =deposited in the account of worker with Provident Fund Commissioner.
24. PERT is: = event oriented technique
25. Bar charts are suitable for: = minor works.
26. ? on a PERT/CPM chart represents: = a significant event representing some mile-stone
27. Electron volt is the unit of : = Energy.
28. Seamless tubes are made by?
29. Reheating in gas turbine results in: = increase of work ratio and decrease of thermal efficiency.
30. Why DC current is not used in transformer?
31. When a generator of internal impedance and operating at 1GHz feeds a load via a coaxial line of characteristic impedance 50 ohm then the voltage wave ratio on the feed line is –
a.) 0.5
b.) 1.5
c.) 2.5
d.) 1.75
32. The coding system typically used in digital telemetry is –
a.) PPM (pulse position modulation)
b.) PAM (pulse amplitude modulation)
c.) PCM (pulse code modulation)
d.) PDM (pulse duration modulation)
32.Radiation pyrometers are used for the measurement of temperature in the range of –
a.) -2000C to 5000C
b.) 00C to 5000C
c.) 5000C to 12000C
d.) 12000C to 25000C
34.RF amplifier of an A.M. receiver is normally biased in –
a.) Class 'A'
b.) Class 'b'
c.) Class 'C'
d.) None
35.The value of gate voltage for the operation of enhancement of only N channel MOSFET has to be –
a.) High positive
b.) High negative
c.) Low positive
d.) Zero
36. The spark plug gap is normally maintained at: = 0.45 to 0.6mm
37. A distributor in spark ignition engines performs the function of : = Providing the correct firing order in engine
38. Which of the following does not relate to C.I. engine:: a) fuel pump b) fuel injector c) governor d) carburetor e) flywheel = (d)
39. Air fuel ratio in a jet engine is = 60:1
40. What is the value of Prandtl No.?
No comments:
Post a Comment