Electrical Engineering Quiz 40
1 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
2 / 50
The input resistance of a VTVM is about ______________?
3 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
4 / 50
A fuse is never inserted in____________?
5 / 50
Voltage Series feedback also called series-shunt feedback) results in__________?
6 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
7 / 50
Magnetic field in a D.C. generator is produced by_______________?
8 / 50
Basically a potentiometer is a device for________________?
9 / 50
A current amplification of 2000 is a gain of_________________?
10 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
11 / 50
The surge resistance of cable is__________?
12 / 50
need frequent starting and stopping of electric motors ?
13 / 50
Electric current passing through the circuit produces_____________?
14 / 50
The term ?cogging? is associated with___________?
15 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
16 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
17 / 50
When a transistor is driven to cut off, ideally the output is _______________?
18 / 50
The motor used on small lathes is usually_________?
19 / 50
1 db corresponds to_____________change in voltage or current level?
20 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
21 / 50
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 ?F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
22 / 50
An emitter follower has ______________input impedance?
23 / 50
The delay fuses are used for the protection of ___________?
24 / 50
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
25 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
26 / 50
For an overhead line, the surge impedance is taken as________________?
27 / 50
A Weston frequency meter is_____________?
28 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
29 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
30 / 50
The lead-acid cell should never be discharged beyond____________?
31 / 50
Capacitive susceptance is a measure of__________?
32 / 50
An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
33 / 50
Murray loop test can be used for location of________________?
34 / 50
The ac voltage controller can be used for ___________?
35 / 50
method has leading power factor____________?
36 / 50
Conductance : mho :: ____________?
37 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
38 / 50
Dynamic equalising circuit is useful____________?
39 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
40 / 50
Dielectric strength of medium____________?
41 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
42 / 50
In a pure resistive circuit__________?
43 / 50
Effect of moisture on the insulating materials is to________________?
44 / 50
For which of the following protection from negative sequence currents is provided ?
45 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
46 / 50
The power demand can be estimated approximately by____________?
47 / 50
Which of the following can be measured by the use of a tachogenerator ?
48 / 50
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
49 / 50
A switch has ______________?
50 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
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