NTPC Executive Trainee Written Test Sample Questions

Mechanical Engineering

1.An engine operates between temperature limits of 900˚K and T2, and another between T2 and 400˚K. For both to be equally efficient , T2 will be equal to
A 600˚K C 650˚K
B 625˚K D 700˚K
2. 40% of the incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissive of the body be 0.15, then the emissivity of surface is
A 0.45 C 0.40
B 0.55 D 0.60
3.The property of a material by virtue of which it can
be beaten or rolled into plates is called
A ductility C malleability
B plasticity D elasticity

Electrical Engineering

1. Twelve identical wires of resistance 6Ω each are arranged to form the edges of a cube. The effective resistance between the opposite corners of the cube is –
A 6Ω C 8Ω
B 5Ω D 4.5Ω
2. A d.c shunt motor runs at 200 V supply, if the armature current is 20 A and resistance of the armature is 0.5 ohm, the back e.m.f developed will be-
A 210 V C 190 V
B 200 V D 180 V
3. A 0-25 A ammeter has guaranteed accuracy of 1% of full scale reading. The current measured by this instrument is 5 A. The limiting error in percentage is
A 5 C 2
B 2.5 D 1