# what is the full form of SMES?

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The full form of SMES is superconducting magnetic energy storage.
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Superconducting Magnetic Energy Storage.

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What is the value of form factor in connection with single phase alternating supply systems ? (A) 1.01 (B) 1.11 (C) 1.21 (0) 1.31

Form factor is the ratio of: (1) Maximum value to r.m.s. value (2) Maximum value to average value (3) r.m.s value to average value (4) r.m.s. value to instantaneous value

The transfer function of a phase lead compensator is found to be the form (s+z1 ) / (s + p1 ) and that of a lag compensator to be of the form (s+z2 ) / (s + p2 ). Then which of the following conditions must be satisfied?  (A) z1 > p1 and z2 > p2 (B) z1 > p1 and z2 < p2 (C) z1 < p1 and z2 < p2 (D) z1 < p1 and z2 > p2

The no-load current drawn by transformer is usually what per cent of the full-load current ?

Which of the following waveforms has the lowest form factor? A) Sine wave B) Square wave C) Sawtooth wave D) Triangle wave

A Transmission line conductor has been suspended freely from two towers and has taken the form of a catenary that has c = 487.68m. The span between the two towers is 152 m, and the weight of the conductor is 1160 kg/km. Calculate the length of the conductor.  (A) 487.68 m (B) 152.614 m (C) 5.934 m (D) 11.9 m

The phase difference between sine and cosine function for a given wave form is

The r.m.s. value of a half-wave rectified alternating current is 10 A. Its value for full-wave rectification will be

The ratio of full -load volt-amperes to short-circuit volt-amperes is equal to :

A three phase induction motor is driving full -load torque which is independent of speed. If the line voltage drops to 90% of the rated value, % increase in motor copper losses  (a) 23% (b) -18% (c) 123% (d) None of these

A full adder is a combinational circuit that performs the arithmetic sum of three input bits and produces a (a) sum output (b) sum output and a carry (c) sum output with two carries (d) two sums with two carries

The efficiency of a transformer at full load 0.8 p.f lagging is 90%. Its efficiency at full load 0.8 p.f leading will be (1) Less than 90% (2) More than 90% (3) 90% (4) None of these

A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : -  a) 16/9 b) 4 / 3 c) 3/4 d) 9 /16

The no~load current of a single phase induction motor is around _____% of full load current.  (1) 10 (2) 20 (3) 40 (4) 80

A 50 Hz, 3—phase induction motor has a full load speed of 1440 rpm. The number of poles of the motor is:   (A)4 (8)6 (0)12  (D)8

The usual value of slip of a 3Φ induction motor at full load is about:  (A) 0.05 (B) 0.1 (C) 0.3 (D) 0.8

What will be the efficiency when the transformer operates at unity power factor and 60% of full load

The grid in triodes is made in the form of (A) mesh (B) metal strip (C) metallic cylinder (D) single filament wire

Composition is a stronger form of which of the following?  (1) Aggregation (2) Encapsulation (3) Inheritance (4) All of the above.

In IC fabrication, the common form of PNP transistor is  A) Vertical PNP B) Lateral PNP C) Triple diffusion PNP D) Substrate PNP

In De Sauty Bridge (unmodified form) it is possible to obtain balance (a) Even if both the capacitors are imperfect (b) If one of the capacitors is perfect (c) Only if both the capacitors are perfect (d) All of the above

Form factor for a sine wave is?

At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is :  (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

A 400/200 volts transformer has pu impedance of 0.05. The HV side voltage required to circulate full load current during short circuit test is

A dc voltmeter has a sensitivity of 1000 Ohm/V. When it measures half full scale in 100 V range, the current through the voltmeter is

The capacitance of 0-1000V electrostatic voltmeter increases from 36-42 pF from zero to full scale deflection. It is required to extend the range of voltmeter to 10000 V by using an external series capacitor. What should be the value of series capacitor?  (A) 0.8 pF (B) 1.00 pF (C) 6.644 pF (D) 4.667 pF

A 150 kW electric motor has an efficiency of 92 %, when it operates at full load. Calculate the losses in the machine.  (A) 92 kW (B) 150 kW (C) 163 kW (D) 13 kW

A 220 V dc machine has an armature resistance o f 1-ohm. If the full load current is 20A, the difference in the induced voltage when the machine is running as a motor, and as a generator is

Name the type of rectifier for each of following feature : (i) Highest rectifier efficiency (ii) Highest form factor (iii) Two diode rectifier circuit (iv) PIV = 2Vm.

Full load current of an Induction motor is 20 Ampere. The no-load current may be expected to be: A) 25 Ampere to 28 Ampere B) 15 Ampere to 18 Ampere C) 11 Ampere to 14 Ampere D) 6 Ampere to 10 Ampere

The full scale range of PMMC voltmeter is 100 V and its sensitivity is 1000 Ω/V. If the meter reads 50 V, the current through the voltmeter is (A) 0.05 mA (B) 0.5 mA (C) 5 mA (D) 50 mA

In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is: (1) 50 Hz (2) 100 Hz (3) 150 Hz (4) 200 Hz

The constant of a given energy meter is 500 revolution/kWh. At the test 4.4 kW full load, meter completes 50 revolutions in 86 seconds. The percentage error of the meter is (a) –4.86% (b) 4.86% (c) 2.0% (d) 3.0%

The type of single-phase induction motor having the highest power factor at full load is (A) shaded pole type (B) split-phase type (C) capacitor-start type (D) capacitor-run type

The transformer utilization factor of full wave bridge rectifier is   (A) 0.812 (B) 0.286 (C) 0.693 (D) 0.782

In a single-phase full converter, the number of SCRs conducting during overlap is   (a) 1 (b) 2 (c) 3 (d) 4

The no load speed of a d.c. shunt motor is 1140 rpm. At full load, the armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full load speed in rpm will be: (A) 1080 (B) 1203 (C) 1000 (D) 1200

The number of cross -points needed for 10 lines in a cross-point switch which is full duplex in nature and there are no self connection is  A) 100 B) 45 C) 50 D) 90