1/100
Superposition theorem is not applicable for ----
2/100
Which one of the following materials cannot be used for permanent magnets?
3/100
For a given dielectric, with increase in temperature the ionic polarizability
4/100
Two bulbs of 100 W/250 V and 150 W/250 V are connected in series across a supply of 250 V. The power consumed by the circuit is
5/100
Three 30Ω resistors are connected in parallel across an ideal 40 V source. What would be the equivalent resistance seen by the load connected across the circuit?
6/100
The maximum power will be transferred from a voltage source to a load when_
7/100
Which of the following is not a conducting material?
8/100
The armature of a DC machine is laminated to reduce
9/100
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2V. The machine generates a voltage of
10/100
250V DC generator is run at rated speed with no excitation. The open circuit voltage will be
11/100
The simplest way of shifting load from one shunt generator to the other operating in parallel is by
12/100
With the increase in speed of a DC motor_
13/100
The direction of rotation of a DC motor can be determined by
14/100
If the applied voltage to a DC machine is 230 V then the back emf for maximum Power developed is --------- papers
15/100
In a DC series motor, the torque developed is
16/100
If one of the control springs of a Permanent Magnet Moving Coil ammeter is broken then, when connected it will read_
17/100
The principle of operation of an LVDT is based on variation of
18/100
The major cause of creeping in an energy meter is
19/100
current transformer has a phase error of +3° The phase angle between primary and secondary currents is
20/100
Unit of reactive power is, -_--
21/100
A series RLC circuit will have unity power factor if operated at a frequency of
22/100
The form factor of sinusoidal alternating current is
23/100
If the reading of two wattmeters are equal and positive in two watt meter method, the load of in a balanced 3-phase, 3-wire circuit will be
24/100
An RLC series circuit has fi and f2 as the half power frequencies and f_o as the resonant frequency. The Q-factor of the circuit is
25/100
In a transformer, zero voltage regulation at full load is
26/100
The transformer efficiency at relatively light loads is quite low. This is due to
27/100
In order to reduce the hysterisis loss_
28/100
Transformers are rated in KVA instead of KW because
29/100
Which of the following connection of transformer will give the highest secondary voltage?
30/100
For successful parallel operation of two single phase transformers, the most essential condition is that their.
31/100
In an auto transformer, power is transferred through
32/100
Distributed winding is preferred over concentrated winding as it
33/100
The short circuit characteristic of an alternator is
34/100
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000V is.
35/100
An ideal synchronous motor has no starting torque because the
36/100
In a synchronous machine, damper windings are used to,
37/100
Armature reaction in a synchronous motor at rated voltage and zero power factor (lead) is
38/100
The principle of operation of a 3-phase induction motor is almost similar to that of
39/100
A three phase 6-pole. 50 Hz, induction motor is running at 5% slip. What is the speed of the motor?
40/100
In an induction motor under running condition, the rotor reactance per phase is ------ Its standstill phase reactance.
41/100
In a three phase induction motor, the starting torque will be maximum when
42/100
The type of single phase induction motor having the highest power factor at full load is
43/100
A universal motor is one which has constant speed
44/100
Which of the following power plants is free from environment al problems?
45/100
Diversity factor is the ratio of
46/100
Flat rate tariff can be charged on the basis of
47/100
In a power plant, a reverse generating capacity, which is in operable condition and available for service, but not in operation is called the
48/100
Advantages of the improved power factor are
49/100
A circuit breaker normally operates
50/100
The RRRV depends upon the
51/100
Threshold characteristics of a plain impedance relay in a complex Z plane is a
52/100
Buchholz relay is
53/100
For the protection of stator winding of an alternator against internal fault involving ground, the relay used is a
54/100
For a medium length transmission line.A is
55/100
When is the Ferranti effect on long overhead lines experienced?
56/100
Hollow conductors are used in transmission lines tO
57/100
The sag of a transmission line is least affected owing to
58/100
if the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency.
59/100
HVDC transmission is preferred to EHV AC because
60/100
The inductance of a transmission line is minimum when_
61/100
Transmission lines are transposed to
62/100
The main criterion for selection of the size of a distributor for a radial distribution system is
63/100
Capacitance grading of cable means
64/100
The composite system (single phase AC to DC system) has been chosen for all future track electrification in India as
65/100
The maximum speed at which trains run on main line railway service is
66/100
The speed-time curve for urban service has no
67/100
Trapezoidal speed-time curve pertains to
68/100
Specific energy consumptions becomes
69/100
The DC series motor is most suitable for traction services but more particularly for urban/suburban services because
70/100
Free running and costing periods are generally long in case of
71/100
Tractive effort of an electric locomotive can be increased by
72/100
The earth wire should be
73/100
The short length of the conductor used to connect the line conductor on one side of the terminal pole to the line conductor on the other side of the pole is known as
74/100
Inside the earth or pit, the earthing electrode should be placed
75/100
The cheapest system of internal wiring is --------- wiring
76/100
For a NPN bipolar transistor, what is the main stream of current in the base region?
77/100
For a junction drain current FET in the pinch off region, as the drain voltage is increased, the drain current-------
78/100
In a centre tap full wave rectifier, 100 V is the peak voltage between the centre tap and one end of the secondary. What is the maximum voltage across the reverse biased diode?
79/100
If the differential and common mode gains of a differential amplifier are 50 and 0.2 respectively, then the CMRR will be.
80/100
An Ideal amplifier has
81/100
The Barkhausen criterion for sustained oscillation is given by
82/100
In a Wien bridge oscillator, the positive feedback attenuation is
83/100
The binary equivalent of hexadecimal number 4F2D is
84/100
The logic function A+BC is the simplified form of which of the following?
85/100
The AND function can be realized by using only n number of NOR gates. What is n equal to
86/100
Number of comparators required to build a 5-bit Analog to Digital converter is
87/100
A thyristor equivalent of a thyratron tube is
88/100
For an SCR, dv/dt protection is achieved through the use of
89/100
The TRIAC is equivalent to
90/100
A Gate Turn Off (GTO) thyriostor has capacity to
91/100
Commutation overlap in the phase-controlled AC to DC converter is due to
92/100
The advantage of using a freewheeling diode with bridge type AC/DC converter is
93/100
A power chopper converts
94/100
AC voltage regulators are widely used in
95/100
The phase controlled rectifiers used in speed control of DC motors converts fixed AC supply voltage into output voltage
96/100
In a UPS, the solid state switch normally transfer supply within
97/100
The internal RAM memory of the 8051 is
98/100
The 8051 has -------- 16-bit counter/timers
99/100
8051 can handle, ---------- interrupt sources
100/100
The I/O ports that are used as address and data for external memory are -------
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