OHPC DET Electrical Question Paper Answer Sample model Paper.
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OHPC DET Electrical Question Paper Answer Sample model Paper
1. ELEMENTS OF ELECTRICAL ENGINEERING :
a. Comprehend basic principles of electricity.
b. Know the magnetic effects of electric current.
c. Understand electromagnetic induction.
d. Understand electric charge and electrostatic field.
2. ELECTRICAL CIRCUITS:
a. Understand Kirchoff`s laws and star delta Transformations and Network Theorems.
b. Comprehend the relationship between quantities connected with alternating current.
c. Comprehend the single phase A.C. Circuits.
d. Poly Phase Circuits.
3. D.C. MACHINES:
a. Fundamentals of D.C. Generators.
b. Armature Reaction and Characteristics of D.C. Generator.
c. Fundamentals of D.C. Motors.
d. Speed Control and Starters for D.C. Motors.
e. Characteristics and Testing of D.C. Motors.
4. ELECTRICAL MEASURING INSTRUMENTS & BATTERIES:
a. Know the classification of different measuring instruments.
b. Understand the construction and working of different electrical measuring instruments.
c. Understand the method of measurement of resistance.
d. Transducers and Sensors
e. Understand Batteries
5. A.C MACHINES:
a. Understand the working of Single Phase Transformers.
b. To understand Three Phase Transformers.
c. Know the classification, construction, working and testing of alternators.
d. Comprehend the procedure for voltage control and synchronization.
e. Comprehend the working of synchronous motors.
f. Comprehend the working of three phase induction motor.
g. Comprehend the working of single Phase induction motor.
h. Comprehend the working of single Phase commutator motor.
6. POWER SYSTEMS:
a. Understand the various sources of Power Generation.
b. Understand working of Thermal Power Station.
c. Understand Hydroelectric Power Station.
d. Understand the working of Nuclear & Gas Power Stations.
e. Comprehend combined operation and economics of power stations.
f. Comprehend the need for transmission and choice of supply system.
g. Line structure for transmission and distribution.
h. Underground Cables.
i. Understand different types of switchgear, fuses and reactors and their working
j. Protective relays.
k. Protection of alternators, transformer and transmission line.
l. Lighting arrestors and neutral grounding.
7. ELECTRONICS:
a. Passive Components (Resistors, Capacitors and Inductors).
b. Know the semi-conductor Devices.
c. Understand the working principle of Power supply circuits.
d. Understand the performance of Special Devices.
e. Understand the principle of Working of Amplifiers.
f. Understand the Principle of Working of Small Signal Amplifiers.
g. Understand the principle of working of Amplifiers.
h. Understand the Principle of Oscillators.
i. Appreciate the need for Modulation and Demodulation.
j. Electronic instruments and Industrial Applications.
k. Know the Basics of ICs.
l Know the basics of digital electronics.
m. Understand the working of combination logic circuits.
n. Understand the working of sequential logic circuits
o. Understand working of registers and memories.
8. ELECTRICAL UTILIZATION AND TRACTION:
a. Understand the principles of lighting.
b. Understand Principle of electric heating, welding and its industrial application.
c. Electric traction systems.
9. GENERAL MECHANICAL ENGINEERING:
a. I.C. Engines – Boilers – Turbines.
b. Understand the working of the centrifugal pumps.
10.INFORMATION TECHNOLOGY.
a. Understand the features of MS-word
b. Understand working with MS-Excel
c. Understand MS-Power point
d. Understand working with MS-Access.
11. INDUSTRIAL MANAGEMENT AND ENTREPRENEURSHIP:
a. Understand the principles of management as applied to industry.
b. Know the organization structure of an industry and the behavior of an individual in an organization.
c. Understand the different aspect of production management.
d. Understands the role of material management industries.
e. Understand marketing, sales and feasibility study.
f. Comprehend the provisions of industrial legislation in India and safety procedures.
g. Understand ISO 9000 and TQM
h. Understand the role of entrepreneur in economic development and in improving the quality of life.
51. For parallel operation of transformer at no load, then load shared are equal when
a) Impedance is proportional with respect to own KVA rating
b)
c)
d)
Ans: Impedance is proportional with respect to own KVA rating
52. In Induction motor Slip frequency of rotor current, when rotor speed is Nr. Then rotor producing slip field rotates with respect to stator is
a) Slip frequency
b) Nr
c) Ns
d) None
Ans: Ns
53. Good regulation means
a) Less fluctuations from no-load to full-load
b)
c)
d)
Ans: Less fluctuation from no-load to full-load
54. At dead short circuit at terminals of Alternator then the current I is
a) ZPF Lag
b) ZPF lead
c) Unity power factor
d) 0.8 Power factor lag
Ans: ZPF Lag
55. Full scale Ammeter reading is 10 mA, Voltage across Ammeter is 100 mV. Then for 100 A measurements the power loss in the circuit is
a) 1 W
b) 10 W
c) 100 W
d) 1000 W
Ans: 10 W*
56. When Alternator excitation increases and machine is operating at lagging power factor then
a) I increase
b) I decreases
c) No effect on current
d) None
Ans: I increase
57. Flue gases coming out from furnace is first going through
a) Turbine
b) Economizer
c) Air pre-heater
d) Chimney
Ans: Economizer
58. Two alternators rated are 200 KW at 4% regulation, 400 KW 5% regulation operating in parallel at 50HZ , when supply 600 KW the new frequency is
a) 50
b) 49
c) 51.3
d) 47.7
Ans: 47.7
59. Va and Vb are negative sequence component voltages the difference angle between Va and Vb with respect to Va is
a) 240
b) 120
c) 180
d) 360
Ans: 120
60. 4-Quadrent operation of chopper I is positive but V is may be positive are negative operates in which quadrant
a) 1 and 2
b) 2 and 3
c) 1 and 3
d) 1 and 4
Ans: 1 and 4
61. Heat convection, radiation, and conduction all are takes place in
a) Ice
b) Boiler
c) Refrigerator
d) Flue gases in pipe
Ans:
62. When moving iron meter is used to measure d.c current what is the disadvantage
a) It calibration in rms value
b)
c)
d)
Ans:
63. When maximum power transfer to load is
a) 20 W
b) 50 W
c) 100W
d) 0W
Ans: 0W
64. Find Zbus Parameters
a) Z11=Z12=Z21= j0.1 ohm, Z22=j0.3 ohm
b)
c)
d)
Ans: Z11=Z12=Z21= j0.1 ohm, Z22=j0.3 ohm
65. Find Z11 and Z12
a) Z11=4 ohm, Z12= 2 ohm
b) Z11=4 ohm, Z12= 5 ohm
c) Z11=5 ohm, Z12= 2 ohm
d) Z11=4 ohm, Z12= 3 ohm
Ans:
66. Current in 5 ohm resister is
a) 10 A
b) -10 A
c) 5 A
d) -5 A
Ans: -10 A
67. Find I in the circuit at t=0+
a) 2 A
b) 5 A
c) 7 A
d) 10 A
Ans:
8. Find voltage across inductor at t=0+
a) 0 V
b) 2.5 V
c) 5 V
d) 10 V
Ans: 5 V
69. This wave is applied to the PMMC meter, meter reads
a) 0 V
b) 3 V
c) 2 V
d) 1 V
Ans: 1 V
70. Find Vab
a) Zero
b) 50 at an angle of 90 deg
c) 50 at an angle of 90 deg
d) None
Ans:
71. Find E in the circuit
a) 5 V
b) 10 V
c) 20 V
d) None
Ans: None
72. Vab is reference then angle between Vab and Ib is
a) -15 deg
b) 240 deg
c) 180 deg
d) -45 deg
Ans: -15 deg*
63. When maximum power transfer to load is
Click Here to Show Diagram
a) 20 W
b) 50 W
c) 100W
d) 0W
Ans: 0W
64. Find Zbus Parameters
Click Here to Show Diagram
a) Z11=Z12=Z21= j0.1 ohm, Z22=j0.3 ohm
b)
c)
d)
Ans: Z11=Z12=Z21= j0.1 ohm, Z22=j0.3 ohm
65. Find Z11 and Z12
Click Here to Show Diagram
a) Z11=4 ohm, Z12= 2 ohm
b) Z11=4 ohm, Z12= 5 ohm
c) Z11=5 ohm, Z12= 2 ohm
d) Z11=4 ohm, Z12= 3 ohm
Ans:
66. Current in 5 ohm resister is
Click Here to Show Diagram
a) 10 A
b) -10 A
c) 5 A
d) -5 A
Ans: -10 A
67. Find I in the circuit at t=0+
Click Here to Show Diagram
a) 2 A
b) 5 A
c) 7 A
d) 10 A
Ans: 2 A
68. Find voltage across inductor at t=0+
Click Here to Show Diagram
a) 0 V
b) 2.5 V
c) 5 V
d) 10 V
Ans: 5 V
69. This wave is applied to the PMMC meter, meter reads
Click Here to Show Diagram
a) 0 V
b) 3 V
c) 2 V
d) 1 V
Ans: 1 V
70. Find Vab
Click Here to Show Diagram
a) Zero
b) 50 at an angle of 90 deg
c) 50 at an angle of 90 deg
d) None
Ans:
71. Find E in the circuit
Click Here to Show Diagram
a) 5 V
b) 10 V
c) 20 V
d) None
Ans: None
72. Vab is reference then angle between Vab and Ib is
Click Here to Show Diagram
a) -15 deg
b) 240 deg
c) 180 deg
d) -45 deg
Ans: -15 deg*
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