Question 1
Zero power factor method of an alternator is used to find its
Correct Answer : b
Selected Answer : c
Explanation : There are mainly two methods which are used to determine the regulation of voltage of a smooth cylindrical rotor type alternators. They are named as direct load test method and indirect methods of voltage regulation.
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Question 2
Form factor for a sine wave is
Correct Answer : c
Selected Answer : b
Explanation : For a pure sinusoidal waveform the Form Factor will always be equal to 1.11
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Question 3
Three lamps are in circuit as shown in Figure given below. The lamp of 100 W will have maximum brightness when
Correct Answer : b
Selected Answer : b
Explanation :
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Question 4
Which of the following is non-linear device:
Correct Answer : d
Selected Answer : d
Explanation : The non-linear circuit is also an electric circuit and the parameters of this circuit differ with respect to the current and the voltage
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Question 5
Which of the following methods may be used to convert A.C. system to D.C:
Correct Answer : a
Selected Answer : a
Explanation : Rectifier Converts AC into DC
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Question 6
The minimum dielectric stress in a cable is at
Correct Answer : d
Selected Answer : d
Explanation : The dielectric strength of a material is a measure of the electrical strength of an insulator. Lead sheath having minimum dielectric stress.
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Question 7
Open circuit test on transformers is conducted to determine.
Correct Answer : c
Selected Answer : c
Explanation : Open circuit test or no load test on a transformer is performed to determine 'no load loss (core loss)' and 'no load current I0'. The circuit diagram for open circuit test is shown in the figure below. Usually high voltage (HV) winding is kept open and the low voltage (LV) winding is connected to its normal supply.
Explanation : ' and 'no load current I0'. The circuit diagram for open circuit test is shown in the figure below. Usually high voltage (HV) winding is kept open and the low voltage (LV) winding is connected to its normal supply.)
Question 8
The efficiency of two identical transformers under load conditions can be determined by
Correct Answer : b
Selected Answer : b
Explanation : The maximum temperature rise in a large transformer is determined by the full load test. This test is called, back-to-back test, regenerative test or Sumpner's test. The suitable load which absorbs the full load power of a large transformer will not easily be available
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Question 9
Synchronous speed for motor 3000 RPM, 50Hz, calculate number of poles
Correct Answer : a
Selected Answer : a
Explanation : Ns =120f / P ,P=120f / Ns
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Question 10
The Three Terminal of transistor are:
Correct Answer : c
Selected Answer : c
Explanation : It consist of 3 terminal.Base, Collector and Emitter
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Question 11
The process by which impurities are added to a pure semiconductor is
Correct Answer : c
Selected Answer : c
Explanation : The process of adding controlled impurities to a semiconductor is known as doping. The amount of impurity, or dopant, added to an intrinsic (pure) semiconductor varies its level of conductivity.
Explanation :  semiconductor varies its level of conductivity.)
Question 12
A material for good magnetic memory should have
Correct Answer : d
Selected Answer : d
Explanation : A good magnetic material should have high retentively
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Question 13
Conductivity is analogous to
Correct Answer : c
Selected Answer : c
Explanation : This is similar to the equation for electrical resistance in materials, with permeability being analogous to conductivity.
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Question 14
In a magnetic material hysteresis loss takes place primarily due to
Correct Answer : d
Selected Answer : b
Explanation : In a magnetic material hysteresis loss takes place primarily due to its high retentivity.
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Question 15
For power factor correction of power systems which one is used:
Correct Answer : a
Selected Answer : a
Explanation : capacitor can be used for power factor correction
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Question 16
By which of the following systems electric power may be transmitted:
Correct Answer : c
Selected Answer : c
Explanation : An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy across large distances the overhead systems and underground systems of the main systems to electric power transmitted
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Question 17
Which circuit breaker in commonly used in the distribution level
Correct Answer : a
Selected Answer : a
Explanation : Air Circuit breaker is commonly used in the distribution level. Because it is simple and economic
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Question 18
The power factor of an alternator depends on:
Correct Answer : a
Selected Answer : a
Explanation : The power factor of alternator depends on nature of the load connected. Eg, The alternator operates at lagging power factor if the load connected is inductive in nature
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Question 19
The Conductance expressed in terms of
Correct Answer : d
Selected Answer : d
Explanation : Reciprocal of the resistance
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Question 20
In which of the following circuit, voltage source produce more current
Correct Answer : b
Selected Answer : b
Explanation : 10Ω resistance connected in parallel is equal to 5Ω and I = V / R =2 Amps
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Question 21
A risk profile is a list of questions that address traditional areas of uncertainty on a project that answers developed from
Correct Answer : d
Selected Answer : d
Explanation : Scenario analysis is the easiest and most commonly used technique for analyzing risks from previous and similar projects.
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Question 22
The risk assessment form contains all of the following
Correct Answer : c
Selected Answer : b
Explanation : "Risk Assessment Identify hazards and risk factors that have the potential to cause harm (hazard identification). Analyze and evaluate the risk associated with that hazard (risk analysis, and risk evaluation). Determine appropriate ways to eliminate the hazard, or control the risk when the hazard cannot be eliminated (risk control). "
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Question 23
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be
Correct Answer : d
Selected Answer : d
Explanation : Current I1 and I2 = 100 Amps; Distance = 20 mm = 20 x10-3 m; Force = ?
We know that the force is found by the following expression. Torque developed force fT=M0 *I1 *I2/(2*(Pi)*d)=4*(Pi)*(10)^-7 *(100)^2/2*(pi)*20*(10)^-3=0.1 N
Explanation : *d)=4*(Pi)*(10)^-7 *(100)^2/2*(pi)*20*(10)^-3=0.1 N
)
Question 24
A 10V source is connected across 5ohm resistor. Find the current flow through the resistor
Correct Answer : b
Selected Answer : b
Explanation : I = V/ R
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Question 25
The purpose of damper winding in synchronous machines is
Correct Answer : d
Selected Answer : d
Explanation : Oscillation can be reduced by damper winding
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Question 26
Inverter is a circuit which converts
Correct Answer : a
Selected Answer : a
Explanation : It convert dc power in to variable voltage and variable frequency.
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Question 27
Sensor transducers (temperature, motion, etc ) will transfer to what type of signal
Correct Answer : a
Selected Answer : a
Explanation : Transducer” is the collective term used for both Sensors which can be used to sense a wide range of different energy forms such as movement, electrical signals,
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