1/100
In a given below circuit, at resonance Iʀ is equal to
2/100
As altrnating current a peak value of 2A .If is Peak Factor is √2 and from factor is π/2√2 , them it's average value is
3/100
The pover factor of an incandescent bulb is
4/100
4. The power factor of a circuit comprising resistance R and reactance X in series is
5/100
The working principle of a Transformer in
6/100
The equivalent resistance of transformer having tranfarmation ratio (K) = 5 and R₁=0.1Ω when referred to secondary is
7/100
Whit is load at which maximum efficiency occurs in ease of a 100 KVA transformer with iron loss of 1 kW and full load copper loss of 2 kW -
8/100
In high frequency transformers, the material used for core is
9/100
Buchholz relay is used to
10/100
Distribution transformers are designed to keep core losses minimum and copper losses are relatively less important because
11/100
Which one of the following methods gives more accurate result for determination of voltage regulation of an alternator
12/100
12. Hydrogen is used in large alternators mainly to
13/100
The frequency of emf generated in an 8-pole alternator running at 900 rpm is
14/100
14. The angle between synchronously rotating stator flux and rotor poles of a synchronous motor is called ----- Angle
15/100
If, θₑ be the electrical angle and θₘ be the mechanical angle and P be the number of poles of synchronous motor, then which one of the following relation is true?
16/100
The essential condition for parallel operation of two single phase transformers is that they should have same
17/100
The V-curve of synchronous moter is a plot of
18/100
A wound rotor induction motor runs with a slip of 0.03 when developing full load torque. Its rotor resistance is 0.25 ohm per phase. If an external resistance 0.50 ohm per phase is connected across the slip rings, what is the ship for full load torque?
19/100
19. The torque developed in a three phase induction motor depends on
20/100
. A single phase ac induction motor is not self starting because it has
21/100
1.A single phase winding in a single phase motor produces
22/100
Under no-load conditions, power factor an induction is about
23/100
Of all the plants, minimum quantity of fuel used is required in ---plant
24/100
The overall efficiency of a Thermal Power Station is
25/100
The effect of water hammer can be minimized by using
26/100
In a diesel power plant suspended impurities in the fuel are removed by
27/100
The rupturing capacity of a circuit breaker is measured in
28/100
A circuit breaker is essentially
29/100
Mho relay normally is used for protection of
30/100
The scheme adopted for bus-bar protection is
31/100
Due to the ferrari effect on long overhead lines---------
32/100
Corons occurs between two transmission lines when they are
33/100
Surge impedance of a transmission line is given by
34/100
The general distance for short transmission line is
35/100
35 The resistance of the line
36/100
In HVDC Transmission System AC is converted to DC using
37/100
Suspension type insulators are used for voltages beyond
38/100
Power Factor of Industrial loads is geurally
39/100
Pole mounted transformer stations are meant for
40/100
Transmission lines are transposed to
41/100
The units for specific energy consumption related to traction is
42/100
In Kando system of track electrification---- is converted into-----
43/100
A train has a scheduled speed of 60 kmph between the stops which are 6 km apart. The actual rum time is ------ if the duration of stop is 60 sec
44/100
Average speed of a train is dependent on
45/100
The electric motos used for traction work should have ------
46/100
Tractive effort of an electric locomotive can be increased by
47/100
Tractive effort required for a train going down from an upgradiant is
48/100
The area under speed-time curve of a train represents
49/100
As the number of wire gauge increases the cross sectional areas of wire.
50/100
Which of the following wiring is not visible outside?
51/100
Resistance of earth system of power station should not exceed the limit of
52/100
In electrical installations the fuse is always connected in ----- wire
53/100
The transistor used in amplifier circuits operates in
54/100
The gain of an amplifier is given by the following formula
55/100
The number of diodes that are used in half wave rectifier and full wave bridge rectifier are
56/100
The average voltage of a fall wave rectifier fed from are ac source of peak voltage,Vm and frequency 50 Hz is
57/100
In a transistor which of the following layer is lightly doped
58/100
Zener diode regulates
59/100
The frequency of oscillation of wein bridge oscillator in Hz is
60/100
XYZ+(XYZ overline ) XYZ + XY bar Z
61/100
The 2's complement of the number D 1001 1100 is
62/100
The boolean expression for NOR gate with inputs A and B is
63/100
A DAC with 8 input bits has --- resolution compared with DAC with 4 input bits
64/100
The power electronic device, Silicon Controlled Rectifier has
65/100
Which one of the following is a bidirectional Controlled switch
66/100
If the gate current of an SCR is increased, its forward break over voltage V_bo will
67/100
In an UJT triggering circuit for SCR, pulses are generated at of UJT
68/100
In a half wave controlled rectifier feeding R-L load, the range of firing angle of thyristor is
69/100
The DC output voltage. Vₒ of a basic chopper circuit with input voltage, V_iɴ and duty cycle, δ is given by
70/100
An AC regulator provides
71/100
The output voltage el a single phase bridge inverter is
72/100
Two quadrant operation of dc motor can be obtained if it is fed from a
73/100
For controlling the speed of a 3 phase induction motor V/f ratio is maintained constant fo
74/100
8051 microcontroller has --- data lines and ------ address lines
75/100
Which of the following instruction is not a data transfer instruction?
76/100
Internal memory of 8051 micro controller consists of
77/100
The highest priority interrupt is
78/100
Percentage Voltage regulation of a transmission line is given by
79/100
In a main line service of electric traction system
80/100
For SCR, dv/dt protection is achieved by connecting --------
81/100
The effective resistance between terminals A and B in the below figure is
82/100
If I be the current, C be the capacitance and V be the potential differences, the I/CV will have the unit of
83/100
In a series R-C circuit excited the DC voltage E., the initial current is
84/100
The strength of electromagnet can be increased by
85/100
Tesla is a unit of
86/100
According to joule's law heat produced by an electric current is proportional to
87/100
The Thevenin's equivalent resistance R_th for given below network is BThe Thevenin's equivalent resistance R_th for given below network is
88/100
In a differential compound generator, the series field turns are provided on
89/100
The function of the commutator in a dc machine is
90/100
If N is the speed and P is number of poles, then the frequency of induced e.m.f in DC generator will be
91/100
The demagnetizing flux in dc generator
92/100
If Tₐ be the torque and Iₐthe armature current for a dc series motor, then which of the following relation is valid before saturation
93/100
What will happen if the back e.m.f of a DC motor vanishes suddenly
94/100
The mechanical power developed by a DC motor is equal to
95/100
Neglecting saturation if current taken by a series motor is increased from 10A to 12A, the percentage increase in its toque is
96/100
Dynamometer type instrument have
97/100
To measure a signal of 10 mV at 75 Hz, which one of the following instrument can be used
98/100
Which one of the following a passive transducer
99/100
The voltage coil of a single phase house energy meter
100/100
100. The effective value of a triangular wave is
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