- State the four methods of laying of cable. State precautions while laying of underground cable in the situation : (i) Minimum clearance between cable and water pipe line when running in parallel. (ii) Minimum clearance between cable and water pipe line when running in parallel. (iii) If cable is laid through pipe what should be diameter of pipe. (iv) When more than one cable is to be laid in the same trench, what should be minimum spacing between two cables ?
- The ratio of maximum displacement of the forced vibration to the deflection due to static force is known as :
- When electric current passes through a metallic conductor, its temperature rises. This is due to?
- If the peak transmitted power in a radar system is increased by a factor of 16, the maximum range will be...
- What is the diameter of the GI pipe through which the earth wire needs to be taken out?
- The efficiency of a centrifugal pump is maximum when its blades are :
- When a source is delivering maximum power to a load, the efficiency of the circuit is always
- The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?
- The property of sand due to which the sand grains stick together, is called
- If 3000 kW power is to be transmitted over a distance of 30 km, the desirable transmission voltage will be.
- What is the maximum data rate that can be transmitted using a QPSK modulation with a roll-off factor of...
- For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ma=1) is :
- In a magnetic material hysteresis loss takes place primarily due to?
- In class - A power amplifier, the collector dissipation is maximum when
- The maximum power in a synchronous motor (for a given excitation) is produced when the power angle is...
- "Maximum power output is obtained from a network when the load resistance...
- When a conductor carries more current on the surface as compared to core, it is due to?
- In a power transformer, the fundamental frequency of the hum arising due to magnetostriction is
- A conductor of diameter d, length 1 consumes a power of W when a current I flows through it. What will be...
- A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : -
- When an alternating current passes through an ohmic resistance the electrical power converted into heat is?
- A salient pole machine delivers maximum power when δ is
- Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:
- A solar cell of 350 V is feeding power to an ac supply of 440 V, 50 Hz through a 3-phase fully controlled bridge
- If X is the system reactance and R is its resistance, the power transferred is maximum when
- The synchronous motor will develop maximum power when the load angle is?
- The average time necessary for the correct sector of a disk to arrive at the read write head is
- Compare pin type and suspension insulators on given points: (i) Position of insulator on cross arm. (ii) Position of conductor on insulator. (iii) Reaction on cross arm. (iv) Possibility of flash over due to large birds (v) Maintenance/Replacement cost (vi) Maximum voltage level (vii) Effect on height of supporting structure. (viii) Life
- The primary reason for low power factor is supply system is due to installation of?
- If 5000 kW power is transmitted at 220 kV in place of 11 kV, reduction in the value of electric current will be
- When there is 12 mA of current through a 1.2 k ohms resistor, the voltage across the resistor is?
- What is the value of Inductance of a coil that induces 20 V when the current through the coil changes from...
- For a series R -C circuit, the power factor corresponding to maximum power is
- In a power plant if the maximum demand on the plant is equal to the plant capacity, then?
- As the thermal noise get doubled due to the increase in a resistance the noise power get.
- When a resistor R is connected to a current source, it consumes a power of 18 W. When the same R is ...
- The power in a series R-L- C circuit will be half of that at resonance when the magnitude of the current is equal to
- When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?
- If it takes a transmitted signal 1m sec to go up to the target and come back after reflection, how far is
- The rate of rise of current through an inductive coil is maximum?
- A cylinder rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission
- A 3-phase 11 kV generator feeds power to a constant power unity power factor load of 100 MW through a
- Maximum power is transferred when
- Maximum power is transferred when load impedance is ...
- When the supply voltage to an induction motor is reduced by 10%, the maximum torque will decrease by
- The equipment installed in power plants to reduce air pollution due to smoke is
- The power loss in a transistor is a function of the product of
- The conduction loss versus device current characteristic of a power MOSFET is best approximated by
- What is the power factor of a cable of loss angle “ө”?
- The probability of a photon ionizing an atom or molecule is maximum when (hv-eVi) is as small as: