1/100
When a high resistance is connected in parallel with a low resistance, the combined resistance is
2/100
If a series circuit consists of three resistance and A battery which of the following statement is always true?
3/100
Regarding Norton's equivalent, which of the following is not correct ?
4/100
What is the meant by permeability ?
5/100
Time constant for an R-L series circuit is given by
6/100
The direction of the induced emf is given by
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If the frequency of pure inductive circuit is halved, then the current of the circuit will be
8/100
The maximum and minimum values of power factor can be
9/100
Eddy currents ina core can be minimized by
10/100
In a periodic table, the elements are arrenged in order of increasing
11/100
The function of A commutator in a D. C machine is
12/100
If the number of poles in a lap wound d.c. generator increased by a factor of 2 , the generated emf will
13/100
Speed of d.c. shunt motor can be increased by
14/100
A starter is used in a d.c. motor because
15/100
If the field winking of a running shunt motor suddenly breaks open
16/100
The direction of rotation of a d.c. motor may be reversed by
17/100
When an electric train moves down a hill, the d.c. motor acts as
18/100
Moving coil instrument can be used for measuring at
19/100
Sensitivity of a voltmeter is expressed as
20/100
Transducer is a device which
21/100
The capacitance of a parallel plate capacitor is not influenced by
22/100
.In a parallel RLC circuit at resonant frequency
23/100
In the two-wattmeter method of measuring power in a three phases circuit, the two wattmeter will show equal readings when the power factor angle Φ is equal to
24/100
. In a three phase system, the phase sequence is used to indicate the
25/100
The bandwidth of a series RLC resonating circuit is represented by
26/100
The no load current of a transformer typically forms the following percent of full load current
27/100
As compared to an electric motor, the efficiency of a transformer of the same rating is
28/100
The short circuit test is used in a transformer to determine
29/100
Two transformers operating in parallel share the load depending on their
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In a transformer, the voltage per turn in primary and secondary are
31/100
The following method is best suited for finding the voltage regulation of an alternator
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Power factor of an alternator driven by constant Prime mover input can be changed by changing its ;
33/100
A four pole 3-phase winding is placed in a stator that has 48 slots. The number of slots per pole per phase is
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In an alternator, if Xₛ is the synchronous reaction, Xc is the leakage reactance, then the reactance Xₐdue to armature flux is given by
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A 3-pole, 4-pole, 24 slot alternator has its armature coils short pitched by one slot. The pitch factor becomes
36/100
If the field of synchronous motor is under excited, the power factor will be
37/100
The starting torque of an induction motor is maximum when
38/100
At zero slip of an induction motor
39/100
The term crawling implies that the machine is
40/100
Single phase induction motor can be made self starting by
41/100
In a semi-conductor, the movement of holes is due to
42/100
In a PNP transistor, the saturation current is due to the flow of
43/100
An n-type FET is never operated with positive gate voltages with respect to the source because
44/100
The gain of an amplifier will be more affected by change in transistor parameters in case of
45/100
A Hartley oscillator uses
46/100
A mandulator is a system to
47/100
In an transmission of signals the frequency which is not transmitted is
48/100
A switch tail ring counter is made by using a single D flip-flop. The resulting circuit is a
49/100
The output of a logic gate is '1' when all its inputs are at logic '0'. The fate is either
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The binary code of (21.125) is
51/100
A free wheeling diode is placed across the die. load
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In a 3 phase full converter, the six SCRₛ are fixed at intervals of
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In a single phase fully controlled converter, the number of SCRₛ conducting during overlap is
54/100
A single phase fully controlled converter is a
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Power factor is equal to
56/100
While plugging of a separately excited d.c, motor, the supply to the armature is
57/100
A three phase a.c voltage controller feeding three phase induction motor has an output of
58/100
key board/display interface
59/100
The 8051 micro controller is of ------------ pin package and a ------- processor.
60/100
In 8051, which interrupt has priority?
61/100
The maximum demand of a consumers is 2 kW and his daily energy consumption is 20 units. His load factor is
62/100
Who relay is normally used for the protection of
63/100
The Buchholtz relay protects a transformer from
64/100
It is always economical to improve the P.F. or an installation to
65/100
The main criterion for the design of a distributor is
66/100
Auto reclosing is used in case of
67/100
The unit protection scheme provides
68/100
Lightning Arrestors are used in power systems to prevent electrical equipment against
69/100
A reactor is a coil which has
70/100
To reduce short circuit currents, current -------- are used to
71/100
The EHV is the voltage beyond
72/100
In cables, sheath is used to
73/100
Unit of inductive reactance of a transmission line is
74/100
In the mediam transmission line representation, which of the following parameters are included
75/100
Strain type insulators are
76/100
The phenomena of rise in receiving end voltage of the open circuited or lightly loaded line is called the
77/100
A uniformly loaded d.c. distributed AB is fed at both ends A and B with equal voltages. The maximum voltage drops occurs at
78/100
The method that can bring the locomotive to stand still is
79/100
In the case of HVDC system, there is
80/100
Corona loss is less when the shap of the line of the conductor is
81/100
The voltage required to produce are in are welding in the renge of
82/100
In case of coreless type furnace, the charge should be in
83/100
Choke is provided in Fluorescent tube
84/100
During starting, the train resistance
85/100
In d.c. series traction motor operating on the linear portion of magnetization curve of core material, speed N and armature current I are related as
86/100
In traction system high torque should be produced during
87/100
Shunt motors are not suitable for traction duty because
88/100
Area under speed-time curve represents
89/100
The friction at the track is proportional to
90/100
The total flux required scheme depends inversely on
91/100
In the stair case Lighting arrengements the bulb glows, when the itch positions are
92/100
For long runs, the economical drive used in traction is,______ drive.
93/100
In closed loop control systems, with positive value of feedback gain, the overall gain of the system will
94/100
When the feedback signal becomes equal to the reference signal, then the ______ signal will become zero
95/100
Human system is a multi variable closed loop control system
96/100
A Driver runs a car at a constant speed of 80 kmph. In this case, the feed back element is
97/100
Which type of motor is used in ceiling fun, refrigerator, compressor and other loads requiring no noice operation
98/100
In the stair case lighting arrangement the number of switches used are
99/100
An Electric Drive System consists of
100/100
The speed of a D. C. Motor can be varied below the rated speed by
Result: