1/100
Fundamentally converter is a circuit which
2/100
In dc choppers the wave forms for input and output voltages are respectively
3/100
In 3 phase full converter three SCRs pertaining to one group are fired at an interval of
4/100
A freewheeling diode is placed across the dc load
5/100
A single phase fully controlled converter is a
6/100
In class AB amplifier the output current flows for
7/100
The voltage of CB amplifier configuration has phase shift of
8/100
The pluse difference between input and output voltages of an oscillator is
9/100
Which of the following circul used as voltage to frequency converter
10/100
A reverse biased PN junction has
11/100
Hall effect can be used to measure
12/100
The resistance of a reverse biased diode is
13/100
The base of the hexa decimal number system is
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The octal equivalent of the decimal number 568 is
15/100
Which of the following groups constitute basic logic gates
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The OR gate in positive logic is equivalent to which of the following gates in negative
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Number of flaps of 8051 architecture is
18/100
The timer of 8051 can be operated in one of the modes
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In 8051 serial data transfer takes place in one of the following modes
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The vectored address of a serial interrupt is
21/100
A 8 pole lap wound dc generator is supplying 295 A to load. The field current of the generator is 5A. The current per parallel path is
22/100
If the field circuit resistance of a dc shunt generator exceeds its critical value, the generator
23/100
The field winging of a self exited dc generator is excited by
24/100
The voltage regulation of a dc generator is good at full load implies that the generator is
25/100
If the supply voltage tor dc machine is 230 volts, then the back emf for maximum power developed is
26/100
For a given dc motor the speed depends upon
27/100
A dc shunt motor is minning at 1200 rpm when excited with 220 v dc. Neglecting the losses and saturation the speed of motor when connected to 175 volts dc supply
28/100
A dc series motor develops a torque of 20 Nm at 3 A load current If the current is increased to
29/100
The basic function of transformer is to chenge
30/100
transformer action requires
31/100
Full load voltage regulation of transformer is zero when the power factor of load is near
32/100
In the transformer circuit mode the core loss is represented as
33/100
When the load varies on the secondary side of transformer one of following value will follow the variation of load
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Open circuit test on a transformer is performed with
35/100
The efficiency of two identical transformers under load conditions can be determined by
36/100
The number of poles in turbo alternator is
37/100
The effect of leading power facts on the voltage regulation of an alternatios is
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Which one of the following methods would give higher than actual value of regulation of alternator
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The armature current of a synchronous motor motor on no load
40/100
In a synchronous motor damper windings are used to
41/100
If the field of a synchronous motor is under-excited the power factor will be
42/100
The rotor of a 3 phase wound rotor induction motor is provided with
43/100
In an induction motor if the air gap is increased
44/100
The operation of induction motor is based on
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The supply voltage of an induction motor is reduced by 10%. By what percentage approximately will the maximum torque decrease
46/100
n double revolving field theory of single phase induction motor the slip of the forward motions is "s", then the slip of the back ward motion is
47/100
A 6 pole 50 Hz single phase induction motor runs at a speed of 900 rpm. The frequency of current in the rotor will be
48/100
In a moving coil ammeter the scale on the dial is
49/100
Damping torque in instrument is not generally produced
50/100
In flux meters the following method is used for deflecting torque
51/100
132 kV AC can be measured by
52/100
In a 3 phase system the voltages are
53/100
In the measurement of 3 phase power by two watt meter method, if the two wattnmeter reading are equal and positive, the power factor of the circuit is
54/100
A series RLC circuit draws current at leading power factor at
55/100
In an AC circuit the current and voltages are out phase by 90 degrees. The ammeter reads 2 A and voltmeter reads 1000 V The power consumed is
56/100
A low power factor of the circuit means that it will
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Thevenin's voltage of a circuit is equal to
58/100
Three resistors of each with R ohms are connected in star. The equivalent resistance in delta connection is
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The mutual inductance between two unity coupled coils of 9H is
60/100
Two electric lamps 50 w, 250 V each are connected in series across 250 V supply. The power consumed by the combination is
61/100
Which of the following material has highest dielectric strength
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If the three capacitors of 5F. 10F and 15F are connected in parallel across a supply mains, the equivalent capacitance is
63/100
The electrodes are completely immersed in
64/100
Steam is generated in
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Reheat cycle in steam power plant is used to
66/100
The overall efficiency of thermal power plants is low due to the low efficiency of
67/100
In hydel power plant the area behind the dam is called
68/100
Load factor of a power station is generally
69/100
The preferred relay for the protection of medium transmission line is
70/100
Buchholz relay is operated by
71/100
The shape of the disc in an induction relay
72/100
Which of the following faults is termed as symmetrical fault
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Directional over current relay is used for the protection of
74/100
Which of the following motor is used in traction
75/100
For 25 kV single phase traction system power supply frequency is
76/100
Quadrilateral speed-time-curve pertains to which of the following services
77/100
Longer coasting period for a train results in
78/100
For train lighting the generator used is
79/100
The total energy input per tonne kilometer of the train is called as
80/100
In overhead construction of railways the contact wire is supported by
81/100
The variation of voltage in trolly wire is minimized by
82/100
Which of the following accessory is used to make or break a electrical circuit.
83/100
In incandescent lamps the filament is made of
84/100
The transformer should be located at
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In a 3-pin socket the bigger terminal is connected to
86/100
he capacitive effect is negligible in following type of transmission line
87/100
For a given transmission line with the leading power factor load the voltage regulation is
88/100
The process of achieving uniformity in the dielectric stress in the cables
89/100
The minimum j voltage at which corona occurs is called
90/100
The string efficiency of the insulators can be increased by
91/100
The surge impedance of 100 Km long underground cable is 40 ohms. For a 50 Km length, the surge impedance will be
92/100
The reactance of a generator is given as 0.1 per unit at the base voltage of 20 KV and 400 MVA. The per unit value of the reactance on the base on 10 kV and 100 MVA is
93/100
Generally pin type insulators are not used beyond the voltage
94/100
The reflection coefficient of an open circuited transmission line is
95/100
Which device automatically interrupts the apply in the event of severs faults
96/100
The number of P-N junctions in a thyristor is
97/100
Which one of the following is a bidirectional controlled switch
98/100
Once SCR starts conducting a forward current its gate looses control over
99/100
In a thyristor anode current made up of
100/100
An uncontrolled rectifier implies a rectifier
Result: