1/100
A network contains four resistors in series across an ideal voltage source if the values of all the resistors are doubled then the voltage across each resistor will
2/100
If each branch of a delta circuit has resistance of 1.732R, then each branch of its equivalent star circuit has resistance of
3/100
Thevenin's equivalent circuit consists of
4/100
Which of the following statement is correct?
5/100
The mutual inductance between two coupled coils with self inductances L1=9 H and L2 = 4 H with a coefficient of coupling of 0.5 is
6/100
If the distance between two charges is doubled, the force between them
7/100
The heat produced in a current carrying conductor is
8/100
If the number of conductors and speed of a Lap wound D C Generator is doubled then the generated emf will be
9/100
A4 pole, DC. wave wound Generator runs at 600 rpm. The flux per pole is 0.015 webers and generator no load voltage is 240Volts. The mumber of conductors are
10/100
The simplest way to shift load from one D.C. shunt generator running in parallel with another is by
11/100
The voltage regulation of an over-compound DC generator is always
12/100
D.C. Shunt motors are commonly used in
13/100
The voltage equation of a D.C. motor is
14/100
A 4 pole 240V, d.c. series motor has a wave wound armature with 180 conductors. The armature resistance and field winding resistance are 0.10Ω and 0.20Ω respectively. If the motor is drawing 40A current at 0.015 webers flux per pole. then the speed under this condition is
15/100
The capacity of a battery is expressed in
16/100
Moving coil and moving iron instruments can be distinguished by looking at
17/100
In dynamometer wattmeter, number of coils used are
18/100
Which of the following transducer is known as 'self generating transducer"?
19/100
When a Megger is not in operation then its needle shows a resistance of
20/100
In a pure inductive circuit, the voltage will be
21/100
The peak factor is the ratio of
22/100
A series RLC circuit has a resonant frequency of f_0 Hz. If all the circuit element values are doubled, the new resonant frequency is
23/100
A three phase balanced delta connected circuit has a load impedance of (6+j9) ohms per phase. What is its equivalent star connected load impedance per phase in ohms?
24/100
In two wattmeter method of measurement of power, if the two wattmeters readings are equal, then the power factor will be
25/100
A step-up transformer increases
26/100
A transformer having 1000 primary turns is connected to a 250V AC supply. For a secondary voltage of 400V, the number of secondary turns should be,
27/100
The equivalent resistance of the primary of a 220V/1100V transformer is 0.1Ω Its equivalent resistance referred to secondary is
28/100
A 100kVA transformer has an iron loss of 900W and full load copper loss of 1600W. Its load kVA corresponding to maximam efficiency is -----
29/100
If two transformers A and B are operating in parallel, with voltage rating of transformer A is slightly greater than that of transformer B. If EA and Es are induced emfs. ZA and ZB are the impedances of transformers A and B then the circulating current lc is given by.
30/100
The phase shift in a star-star connected three phase transformer is
31/100
An auto transformer supplies a load of 3KW at 115V at unity power factor. If the appled primary voltage is 230V, calculate the power transferred to the load inductively by neglecting losses.
32/100
The frequency of a 4 pole alternator running at 1500 RPM will be
33/100
The dark and bright lamp method is used for
34/100
In an alternator, the armature reaction influences
35/100
The power developed by a synchronous motor will be maximum when the load angle is
36/100
An over excited synchronous motor is used for
37/100
If the field of a synchronous motor is under excited, the power factor will be
38/100
A 4-pole, 3-phase induction motor is running at 4% ship at full load. If the speed of the motor is 720 rpm, the supply frequency is
39/100
The rotor power output of a 3-phase induction motor is 15kW and the corresponding slip is 4%. The rotor copper loss will be
40/100
When the rotor of a 3-phase induction motor is blocked, the slip is ------
41/100
Double squirrel cage maduction motor has
42/100
A capacitor start, capacitor run Induction motor is basically
43/100
Which of the following motor is most suitable for computer drive printers?
44/100
Ash content of Indian coal is approximately
45/100
A Kaplan turbine is
46/100
The nuclear reactor starts generation when -------
47/100
The maximum demand of a consumer is 2kW and his daily energy consumption is 20 units. His load factor is
48/100
It is always economical to improve the power factor of an installation to
49/100
A 3-phase breaker is rated at 2000MVA, 33kV Its breaking current will be
50/100
The pickup value of a relay is 7.5A and fault current in relay coil is 37 5A. Its plug setting multiplier is
51/100
A mho relay is a
52/100
Buchholz relay provides protection of the transformer from
53/100
A differential protection system responds to the ----- of the two electrical quantities.
54/100
The transfer of elecrtical energy from consumers localities to the consumers premises is called
55/100
The capacitive effect is negligible in
56/100
Surge impedance of a tranmission line is given by
57/100
If the conductor diameter increases, inductance of the line
58/100
The first HVDC scheme in India is Options:
59/100
ACSR conductor implies
60/100
Which of the following equipment is not used in the substations?
61/100
the most commonly used material for insulators of overhead lines is
62/100
As compared to a DC2-Wire distributor, a 3-Wire distributor with same maximum voltage to earth uses only ----- percent of copper
63/100
For the voltages beyond 66kV, the cable used is
64/100
The maximum speed attained by a train on the run is known as
65/100
For train lighting the generator used is
66/100
In speed-time curve for trains, the notching period is
67/100
Which of the following system is used for long distance railways?
68/100
------- motor is preferred for printing machines
69/100
If the gain of the Open-loop system is doubled, the gain margin
70/100
Which of the following element is not used in an automatic control system?
71/100
In SCADA system, the RTU stands for
72/100
Which of the following tool is used for holding, gripping and cutting of wires?
73/100
The wire running on the top of the overhead line, to protect from lightning is called as -------
74/100
In irrigation pump-sets the accidental opening of one of the supply lines is known as --------
75/100
The rating of the fuse wire is always expressed in
76/100
The current in a Zener Diode is controlled by
77/100
Each diode of half wave rectifier conducts for -------
78/100
The transistor used in amplifier circuit operates in ------- region
79/100
The maximum efficiency of Class A amplifier is
80/100
The purpose of coupling capacitor in an amplifier is to -------
81/100
The phase shift oscillator generally contains ---------
82/100
------------ ascillator is the most stable oscillator
83/100
The base of the hexadecimal number system is --------
84/100
The Gate whose output is high, if any of its inputs is high is ---------
85/100
The memory used for main memory in a hand calculator is -------
86/100
Which of the following is the fastest A to D converter ?
87/100
An SCR is a
88/100
Turn-on time of an SCR can be reduced by using a
89/100
In an UJT, maximum value of charging renstance is associated with ------
90/100
The Triac can be used only in
91/100
Freewheeling diode in a converter is placed
92/100
A cycloconverter is a, --------
93/100
In dc chopper, if T is the chopping period, then the output voltage may be controlled by PWM by
94/100
A single phase voltage source square wave inverter feeds pure inductive load the waveform of the load current will be --------
95/100
The PWM control of DC Motor varies ----------- with speed
96/100
SMPS are based on the --------- principle:
97/100
The number of flags of 8051 is ------
98/100
During PUSH instruction, the stack pointer is --------
99/100
In 8255, the length of a control word is
100/100
PIC 8259 is a ------- pin chip
Result: